Adding upstream version 2.1.0.upstream/2.1.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

34 files changed, 34140 insertions, 0 deletions

diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/__init__.py
diff --git a/tests/test_api/test_main.py b/tests/test_api/test_main.py
new file mode 100644
index 0000000..007259e
--- /dev/null
+++ b/tests/test_api/test_main.py
@@ -0,0 +1,279 @@
+from markdown_it import MarkdownIt
+from markdown_it.token import Token
+
+
+def test_get_rules():
+    md = MarkdownIt("zero")
+    # print(md.get_all_rules())
+    assert md.get_all_rules() == {
+        "core": [
+            "normalize",
+            "block",
+            "inline",
+            "linkify",
+            "replacements",
+            "smartquotes",
+        ],
+        "block": [
+            "table",
+            "code",
+            "fence",
+            "blockquote",
+            "hr",
+            "list",
+            "reference",
+            "html_block",
+            "heading",
+            "lheading",
+            "paragraph",
+        ],
+        "inline": [
+            "text",
+            "newline",
+            "escape",
+            "backticks",
+            "strikethrough",
+            "emphasis",
+            "link",
+            "image",
+            "autolink",
+            "html_inline",
+            "entity",
+        ],
+        "inline2": ["balance_pairs", "strikethrough", "emphasis", "text_collapse"],
+    }
+
+
+def test_load_presets():
+    md = MarkdownIt("zero")
+    assert md.get_active_rules() == {
+        "block": ["paragraph"],
+        "core": ["normalize", "block", "inline"],
+        "inline": ["text"],
+        "inline2": ["balance_pairs", "text_collapse"],
+    }
+    md = MarkdownIt("commonmark")
+    assert md.get_active_rules() == {
+        "core": ["normalize", "block", "inline"],
+        "block": [
+            "code",
+            "fence",
+            "blockquote",
+            "hr",
+            "list",
+            "reference",
+            "html_block",
+            "heading",
+            "lheading",
+            "paragraph",
+        ],
+        "inline": [
+            "text",
+            "newline",
+            "escape",
+            "backticks",
+            "emphasis",
+            "link",
+            "image",
+            "autolink",
+            "html_inline",
+            "entity",
+        ],
+        "inline2": ["balance_pairs", "emphasis", "text_collapse"],
+    }
+
+
+def test_override_options():
+    md = MarkdownIt("zero")
+    assert md.options["maxNesting"] == 20
+    md = MarkdownIt("zero", {"maxNesting": 99})
+    assert md.options["maxNesting"] == 99
+
+
+def test_enable():
+    md = MarkdownIt("zero").enable("heading")
+    assert md.get_active_rules() == {
+        "block": ["heading", "paragraph"],
+        "core": ["normalize", "block", "inline"],
+        "inline": ["text"],
+        "inline2": ["balance_pairs", "text_collapse"],
+    }
+    md.enable(["backticks", "autolink"])
+    assert md.get_active_rules() == {
+        "block": ["heading", "paragraph"],
+        "core": ["normalize", "block", "inline"],
+        "inline": ["text", "backticks", "autolink"],
+        "inline2": ["balance_pairs", "text_collapse"],
+    }
+
+
+def test_disable():
+    md = MarkdownIt("zero").disable("inline")
+    assert md.get_active_rules() == {
+        "block": ["paragraph"],
+        "core": ["normalize", "block"],
+        "inline": ["text"],
+        "inline2": ["balance_pairs", "text_collapse"],
+    }
+    md.disable(["text"])
+    assert md.get_active_rules() == {
+        "block": ["paragraph"],
+        "core": ["normalize", "block"],
+        "inline": [],
+        "inline2": ["balance_pairs", "text_collapse"],
+    }
+
+
+def test_reset():
+    md = MarkdownIt("zero")
+    with md.reset_rules():
+        md.disable("inline")
+        assert md.get_active_rules() == {
+            "block": ["paragraph"],
+            "core": ["normalize", "block"],
+            "inline": ["text"],
+            "inline2": ["balance_pairs", "text_collapse"],
+        }
+    assert md.get_active_rules() == {
+        "block": ["paragraph"],
+        "core": ["normalize", "block", "inline"],
+        "inline": ["text"],
+        "inline2": ["balance_pairs", "text_collapse"],
+    }
+
+
+def test_parseInline():
+    md = MarkdownIt()
+    tokens = md.parseInline("abc\n\n> xyz")
+    assert tokens == [
+        Token(
+            type="inline",
+            tag="",
+            nesting=0,
+            attrs=None,
+            map=[0, 1],
+            level=0,
+            children=[
+                Token(
+                    type="text",
+                    tag="",
+                    nesting=0,
+                    attrs=None,
+                    map=None,
+                    level=0,
+                    children=None,
+                    content="abc",
+                    markup="",
+                    info="",
+                    meta={},
+                    block=False,
+                    hidden=False,
+                ),
+                Token(
+                    type="softbreak",
+                    tag="br",
+                    nesting=0,
+                    attrs=None,
+                    map=None,
+                    level=0,
+                    children=None,
+                    content="",
+                    markup="",
+                    info="",
+                    meta={},
+                    block=False,
+                    hidden=False,
+                ),
+                Token(
+                    type="softbreak",
+                    tag="br",
+                    nesting=0,
+                    attrs=None,
+                    map=None,
+                    level=0,
+                    children=None,
+                    content="",
+                    markup="",
+                    info="",
+                    meta={},
+                    block=False,
+                    hidden=False,
+                ),
+                Token(
+                    type="text",
+                    tag="",
+                    nesting=0,
+                    attrs=None,
+                    map=None,
+                    level=0,
+                    children=None,
+                    content="> xyz",
+                    markup="",
+                    info="",
+                    meta={},
+                    block=False,
+                    hidden=False,
+                ),
+            ],
+            content="abc\n\n> xyz",
+            markup="",
+            info="",
+            meta={},
+            block=False,
+            hidden=False,
+        )
+    ]
+
+
+def test_renderInline():
+    md = MarkdownIt("zero")
+    tokens = md.renderInline("abc\n\n*xyz*")
+    assert tokens == "abc\n\n*xyz*"
+
+
+def test_emptyStr():
+    md = MarkdownIt()
+    tokens = md.parseInline("")
+    assert tokens == [
+        Token(
+            type="inline",
+            tag="",
+            nesting=0,
+            attrs=None,
+            map=[0, 1],
+            level=0,
+            children=[],
+            content="",
+            markup="",
+            info="",
+            meta={},
+            block=False,
+            hidden=False,
+        )
+    ]
+
+
+def test_empty_env():
+    """Test that an empty `env` is mutated, not copied and mutated."""
+    md = MarkdownIt()
+
+    env = {}
+    md.render("[foo]: /url\n[foo]", env)
+    assert "references" in env
+
+    env = {}
+    md.parse("[foo]: /url\n[foo]", env)
+    assert "references" in env
+
+
+def test_table_tokens(data_regression):
+    md = MarkdownIt("js-default")
+    tokens = md.parse(
+        """
+| Heading 1 | Heading 2
+| --------- | ---------
+| Cell 1    | Cell 2
+| Cell 3    | Cell 4
+    """
+    )
+    data_regression.check([t.as_dict() for t in tokens])
diff --git a/tests/test_api/test_main/test_table_tokens.yml b/tests/test_api/test_main/test_table_tokens.yml
new file mode 100644
index 0000000..5bac044
--- /dev/null
+++ b/tests/test_api/test_main/test_table_tokens.yml
@@ -0,0 +1,492 @@
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 0
+  map:
+  - 1
+  - 5
+  markup: ''
+  meta: {}
+  nesting: 1
+  tag: table
+  type: table_open
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 1
+  map:
+  - 1
+  - 2
+  markup: ''
+  meta: {}
+  nesting: 1
+  tag: thead
+  type: thead_open
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 2
+  map:
+  - 1
+  - 2
+  markup: ''
+  meta: {}
+  nesting: 1
+  tag: tr
+  type: tr_open
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 3
+  map: null
+  markup: ''
+  meta: {}
+  nesting: 1
+  tag: th
+  type: th_open
+- attrs: null
+  block: true
+  children:
+  - attrs: null
+    block: false
+    children: null
+    content: Heading 1
+    hidden: false
+    info: ''
+    level: 0
+    map: null
+    markup: ''
+    meta: {}
+    nesting: 0
+    tag: ''
+    type: text
+  content: Heading 1
+  hidden: false
+  info: ''
+  level: 4
+  map:
+  - 1
+  - 2
+  markup: ''
+  meta: {}
+  nesting: 0
+  tag: ''
+  type: inline
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 3
+  map: null
+  markup: ''
+  meta: {}
+  nesting: -1
+  tag: th
+  type: th_close
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 3
+  map: null
+  markup: ''
+  meta: {}
+  nesting: 1
+  tag: th
+  type: th_open
+- attrs: null
+  block: true
+  children:
+  - attrs: null
+    block: false
+    children: null
+    content: Heading 2
+    hidden: false
+    info: ''
+    level: 0
+    map: null
+    markup: ''
+    meta: {}
+    nesting: 0
+    tag: ''
+    type: text
+  content: Heading 2
+  hidden: false
+  info: ''
+  level: 4
+  map:
+  - 1
+  - 2
+  markup: ''
+  meta: {}
+  nesting: 0
+  tag: ''
+  type: inline
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 3
+  map: null
+  markup: ''
+  meta: {}
+  nesting: -1
+  tag: th
+  type: th_close
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 2
+  map: null
+  markup: ''
+  meta: {}
+  nesting: -1
+  tag: tr
+  type: tr_close
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 1
+  map: null
+  markup: ''
+  meta: {}
+  nesting: -1
+  tag: thead
+  type: thead_close
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 1
+  map:
+  - 3
+  - 5
+  markup: ''
+  meta: {}
+  nesting: 1
+  tag: tbody
+  type: tbody_open
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 2
+  map:
+  - 3
+  - 4
+  markup: ''
+  meta: {}
+  nesting: 1
+  tag: tr
+  type: tr_open
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 3
+  map: null
+  markup: ''
+  meta: {}
+  nesting: 1
+  tag: td
+  type: td_open
+- attrs: null
+  block: true
+  children:
+  - attrs: null
+    block: false
+    children: null
+    content: Cell 1
+    hidden: false
+    info: ''
+    level: 0
+    map: null
+    markup: ''
+    meta: {}
+    nesting: 0
+    tag: ''
+    type: text
+  content: Cell 1
+  hidden: false
+  info: ''
+  level: 4
+  map:
+  - 3
+  - 4
+  markup: ''
+  meta: {}
+  nesting: 0
+  tag: ''
+  type: inline
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 3
+  map: null
+  markup: ''
+  meta: {}
+  nesting: -1
+  tag: td
+  type: td_close
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 3
+  map: null
+  markup: ''
+  meta: {}
+  nesting: 1
+  tag: td
+  type: td_open
+- attrs: null
+  block: true
+  children:
+  - attrs: null
+    block: false
+    children: null
+    content: Cell 2
+    hidden: false
+    info: ''
+    level: 0
+    map: null
+    markup: ''
+    meta: {}
+    nesting: 0
+    tag: ''
+    type: text
+  content: Cell 2
+  hidden: false
+  info: ''
+  level: 4
+  map:
+  - 3
+  - 4
+  markup: ''
+  meta: {}
+  nesting: 0
+  tag: ''
+  type: inline
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 3
+  map: null
+  markup: ''
+  meta: {}
+  nesting: -1
+  tag: td
+  type: td_close
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 2
+  map: null
+  markup: ''
+  meta: {}
+  nesting: -1
+  tag: tr
+  type: tr_close
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 2
+  map:
+  - 4
+  - 5
+  markup: ''
+  meta: {}
+  nesting: 1
+  tag: tr
+  type: tr_open
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 3
+  map: null
+  markup: ''
+  meta: {}
+  nesting: 1
+  tag: td
+  type: td_open
+- attrs: null
+  block: true
+  children:
+  - attrs: null
+    block: false
+    children: null
+    content: Cell 3
+    hidden: false
+    info: ''
+    level: 0
+    map: null
+    markup: ''
+    meta: {}
+    nesting: 0
+    tag: ''
+    type: text
+  content: Cell 3
+  hidden: false
+  info: ''
+  level: 4
+  map:
+  - 4
+  - 5
+  markup: ''
+  meta: {}
+  nesting: 0
+  tag: ''
+  type: inline
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 3
+  map: null
+  markup: ''
+  meta: {}
+  nesting: -1
+  tag: td
+  type: td_close
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 3
+  map: null
+  markup: ''
+  meta: {}
+  nesting: 1
+  tag: td
+  type: td_open
+- attrs: null
+  block: true
+  children:
+  - attrs: null
+    block: false
+    children: null
+    content: Cell 4
+    hidden: false
+    info: ''
+    level: 0
+    map: null
+    markup: ''
+    meta: {}
+    nesting: 0
+    tag: ''
+    type: text
+  content: Cell 4
+  hidden: false
+  info: ''
+  level: 4
+  map:
+  - 4
+  - 5
+  markup: ''
+  meta: {}
+  nesting: 0
+  tag: ''
+  type: inline
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 3
+  map: null
+  markup: ''
+  meta: {}
+  nesting: -1
+  tag: td
+  type: td_close
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 2
+  map: null
+  markup: ''
+  meta: {}
+  nesting: -1
+  tag: tr
+  type: tr_close
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 1
+  map: null
+  markup: ''
+  meta: {}
+  nesting: -1
+  tag: tbody
+  type: tbody_close
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 0
+  map: null
+  markup: ''
+  meta: {}
+  nesting: -1
+  tag: table
+  type: table_close
diff --git a/tests/test_api/test_plugin_creation.py b/tests/test_api/test_plugin_creation.py
new file mode 100644
index 0000000..3a9af8b
--- /dev/null
+++ b/tests/test_api/test_plugin_creation.py
@@ -0,0 +1,88 @@
+"""Test basic plugin creation functionality:
+that they can be added and are called correctly
+"""
+from markdown_it import MarkdownIt
+
+
+def inline_rule(state, silent):
+    print("plugin called")
+
+
+def test_inline_after(capsys):
+    def _plugin(_md):
+        _md.inline.ruler.after("text", "new_rule", inline_rule)
+
+    MarkdownIt().use(_plugin).parse("[")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def test_inline_before(capsys):
+    def _plugin(_md):
+        _md.inline.ruler.before("text", "new_rule", inline_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def test_inline_at(capsys):
+    def _plugin(_md):
+        _md.inline.ruler.at("text", inline_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def block_rule(state, startLine, endLine, silent):
+    print("plugin called")
+
+
+def test_block_after(capsys):
+    def _plugin(_md):
+        _md.block.ruler.after("hr", "new_rule", block_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def test_block_before(capsys):
+    def _plugin(_md):
+        _md.block.ruler.before("hr", "new_rule", block_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def test_block_at(capsys):
+    def _plugin(_md):
+        _md.block.ruler.at("hr", block_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def core_rule(state):
+    print("plugin called")
+
+
+def test_core_after(capsys):
+    def _plugin(_md):
+        _md.core.ruler.after("normalize", "new_rule", core_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def test_core_before(capsys):
+    def _plugin(_md):
+        _md.core.ruler.before("normalize", "new_rule", core_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def test_core_at(capsys):
+    def _plugin(_md):
+        _md.core.ruler.at("normalize", core_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out
diff --git a/tests/test_api/test_token.py b/tests/test_api/test_token.py
new file mode 100644
index 0000000..e3806b5
--- /dev/null
+++ b/tests/test_api/test_token.py
@@ -0,0 +1,38 @@
+import warnings
+
+from markdown_it.token import Token
+
+
+def test_token():
+    token = Token("name", "tag", 0)
+    assert token.as_dict() == {
+        "type": "name",
+        "tag": "tag",
+        "nesting": 0,
+        "attrs": None,
+        "map": None,
+        "level": 0,
+        "children": None,
+        "content": "",
+        "markup": "",
+        "info": "",
+        "meta": {},
+        "block": False,
+        "hidden": False,
+    }
+    token.attrSet("a", "b")
+    assert token.attrGet("a") == "b"
+    token.attrJoin("a", "c")
+    assert token.attrGet("a") == "b c"
+    token.attrPush(["x", "y"])
+    assert token.attrGet("x") == "y"
+    with warnings.catch_warnings():
+        warnings.simplefilter("ignore")
+        assert token.attrIndex("a") == 0
+        assert token.attrIndex("x") == 1
+        assert token.attrIndex("j") == -1
+
+
+def test_serialization():
+    token = Token("name", "tag", 0, children=[Token("other", "tag2", 0)])
+    assert token == Token.from_dict(token.as_dict())
diff --git a/tests/test_cli.py b/tests/test_cli.py
new file mode 100644
index 0000000..57d6b93
--- /dev/null
+++ b/tests/test_cli.py
@@ -0,0 +1,36 @@
+import pathlib
+import tempfile
+from unittest.mock import patch
+
+import pytest
+
+from markdown_it.cli import parse
+
+
+def test_parse():
+    with tempfile.TemporaryDirectory() as tempdir:
+        path = pathlib.Path(tempdir).joinpath("test.md")
+        path.write_text("a b c")
+        assert parse.main([str(path)]) == 0
+
+
+def test_parse_fail():
+    with pytest.raises(SystemExit) as exc_info:
+        parse.main(["/tmp/nonexistant_path/for_cli_test.md"])
+    assert exc_info.value.code == 1
+
+
+def test_print_heading():
+    with patch("builtins.print") as patched:
+        parse.print_heading()
+    patched.assert_called()
+
+
+def test_interactive():
+    def mock_input(prompt):
+        raise KeyboardInterrupt
+
+    with patch("builtins.print") as patched:
+        with patch("builtins.input", mock_input):
+            parse.interactive()
+    patched.assert_called()
diff --git a/tests/test_cmark_spec/commonmark.json b/tests/test_cmark_spec/commonmark.json
new file mode 100644
index 0000000..d742f94
--- /dev/null
+++ b/tests/test_cmark_spec/commonmark.json
@@ -0,0 +1,5218 @@
+[
+  {
+    "markdown": "\tfoo\tbaz\t\tbim\n",
+    "html": "<pre><code>foo\tbaz\t\tbim\n</code></pre>\n",
+    "example": 1,
+    "start_line": 356,
+    "end_line": 361,
+    "section": "Tabs"
+  },
+  {
+    "markdown": "  \tfoo\tbaz\t\tbim\n",
+    "html": "<pre><code>foo\tbaz\t\tbim\n</code></pre>\n",
+    "example": 2,
+    "start_line": 363,
+    "end_line": 368,
+    "section": "Tabs"
+  },
+  {
+    "markdown": "    a\ta\n    ὐ\ta\n",
+    "html": "<pre><code>a\ta\nὐ\ta\n</code></pre>\n",
+    "example": 3,
+    "start_line": 370,
+    "end_line": 377,
+    "section": "Tabs"
+  },
+  {
+    "markdown": "  - foo\n\n\tbar\n",
+    "html": "<ul>\n<li>\n<p>foo</p>\n<p>bar</p>\n</li>\n</ul>\n",
+    "example": 4,
+    "start_line": 383,
+    "end_line": 394,
+    "section": "Tabs"
+  },
+  {
+    "markdown": "- foo\n\n\t\tbar\n",
+    "html": "<ul>\n<li>\n<p>foo</p>\n<pre><code>  bar\n</code></pre>\n</li>\n</ul>\n",
+    "example": 5,
+    "start_line": 396,
+    "end_line": 408,
+    "section": "Tabs"
+  },
+  {
+    "markdown": ">\t\tfoo\n",
+    "html": "<blockquote>\n<pre><code>  foo\n</code></pre>\n</blockquote>\n",
+    "example": 6,
+    "start_line": 419,
+    "end_line": 426,
+    "section": "Tabs"
+  },
+  {
+    "markdown": "-\t\tfoo\n",
+    "html": "<ul>\n<li>\n<pre><code>  foo\n</code></pre>\n</li>\n</ul>\n",
+    "example": 7,
+    "start_line": 428,
+    "end_line": 437,
+    "section": "Tabs"
+  },
+  {
+    "markdown": "    foo\n\tbar\n",
+    "html": "<pre><code>foo\nbar\n</code></pre>\n",
+    "example": 8,
+    "start_line": 440,
+    "end_line": 447,
+    "section": "Tabs"
+  },
+  {
+    "markdown": " - foo\n   - bar\n\t - baz\n",
+    "html": "<ul>\n<li>foo\n<ul>\n<li>bar\n<ul>\n<li>baz</li>\n</ul>\n</li>\n</ul>\n</li>\n</ul>\n",
+    "example": 9,
+    "start_line": 449,
+    "end_line": 465,
+    "section": "Tabs"
+  },
+  {
+    "markdown": "#\tFoo\n",
+    "html": "<h1>Foo</h1>\n",
+    "example": 10,
+    "start_line": 467,
+    "end_line": 471,
+    "section": "Tabs"
+  },
+  {
+    "markdown": "*\t*\t*\t\n",
+    "html": "<hr />\n",
+    "example": 11,
+    "start_line": 473,
+    "end_line": 477,
+    "section": "Tabs"
+  },
+  {
+    "markdown": "\\!\\\"\\#\\$\\%\\&\\'\\(\\)\\*\\+\\,\\-\\.\\/\\:\\;\\<\\=\\>\\?\\@\\[\\\\\\]\\^\\_\\`\\{\\|\\}\\~\n",
+    "html": "<p>!&quot;#$%&amp;'()*+,-./:;&lt;=&gt;?@[\\]^_`{|}~</p>\n",
+    "example": 12,
+    "start_line": 490,
+    "end_line": 494,
+    "section": "Backslash escapes"
+  },
+  {
+    "markdown": "\\\t\\A\\a\\ \\3\\φ\\«\n",
+    "html": "<p>\\\t\\A\\a\\ \\3\\φ\\«</p>\n",
+    "example": 13,
+    "start_line": 500,
+    "end_line": 504,
+    "section": "Backslash escapes"
+  },
+  {
+    "markdown": "\\*not emphasized*\n\\<br/> not a tag\n\\[not a link](/foo)\n\\`not code`\n1\\. not a list\n\\* not a list\n\\# not a heading\n\\[foo]: /url \"not a reference\"\n\\&ouml; not a character entity\n",
+    "html": "<p>*not emphasized*\n&lt;br/&gt; not a tag\n[not a link](/foo)\n`not code`\n1. not a list\n* not a list\n# not a heading\n[foo]: /url &quot;not a reference&quot;\n&amp;ouml; not a character entity</p>\n",
+    "example": 14,
+    "start_line": 510,
+    "end_line": 530,
+    "section": "Backslash escapes"
+  },
+  {
+    "markdown": "\\\\*emphasis*\n",
+    "html": "<p>\\<em>emphasis</em></p>\n",
+    "example": 15,
+    "start_line": 535,
+    "end_line": 539,
+    "section": "Backslash escapes"
+  },
+  {
+    "markdown": "foo\\\nbar\n",
+    "html": "<p>foo<br />\nbar</p>\n",
+    "example": 16,
+    "start_line": 544,
+    "end_line": 550,
+    "section": "Backslash escapes"
+  },
+  {
+    "markdown": "`` \\[\\` ``\n",
+    "html": "<p><code>\\[\\`</code></p>\n",
+    "example": 17,
+    "start_line": 556,
+    "end_line": 560,
+    "section": "Backslash escapes"
+  },
+  {
+    "markdown": "    \\[\\]\n",
+    "html": "<pre><code>\\[\\]\n</code></pre>\n",
+    "example": 18,
+    "start_line": 563,
+    "end_line": 568,
+    "section": "Backslash escapes"
+  },
+  {
+    "markdown": "~~~\n\\[\\]\n~~~\n",
+    "html": "<pre><code>\\[\\]\n</code></pre>\n",
+    "example": 19,
+    "start_line": 571,
+    "end_line": 578,
+    "section": "Backslash escapes"
+  },
+  {
+    "markdown": "<http://example.com?find=\\*>\n",
+    "html": "<p><a href=\"http://example.com?find=%5C*\">http://example.com?find=\\*</a></p>\n",
+    "example": 20,
+    "start_line": 581,
+    "end_line": 585,
+    "section": "Backslash escapes"
+  },
+  {
+    "markdown": "<a href=\"/bar\\/)\">\n",
+    "html": "<a href=\"/bar\\/)\">\n",
+    "example": 21,
+    "start_line": 588,
+    "end_line": 592,
+    "section": "Backslash escapes"
+  },
+  {
+    "markdown": "[foo](/bar\\* \"ti\\*tle\")\n",
+    "html": "<p><a href=\"/bar*\" title=\"ti*tle\">foo</a></p>\n",
+    "example": 22,
+    "start_line": 598,
+    "end_line": 602,
+    "section": "Backslash escapes"
+  },
+  {
+    "markdown": "[foo]\n\n[foo]: /bar\\* \"ti\\*tle\"\n",
+    "html": "<p><a href=\"/bar*\" title=\"ti*tle\">foo</a></p>\n",
+    "example": 23,
+    "start_line": 605,
+    "end_line": 611,
+    "section": "Backslash escapes"
+  },
+  {
+    "markdown": "``` foo\\+bar\nfoo\n```\n",
+    "html": "<pre><code class=\"language-foo+bar\">foo\n</code></pre>\n",
+    "example": 24,
+    "start_line": 614,
+    "end_line": 621,
+    "section": "Backslash escapes"
+  },
+  {
+    "markdown": "&nbsp; &amp; &copy; &AElig; &Dcaron;\n&frac34; &HilbertSpace; &DifferentialD;\n&ClockwiseContourIntegral; &ngE;\n",
+    "html": "<p>  &amp; © Æ Ď\n¾ ℋ ⅆ\n∲ ≧̸</p>\n",
+    "example": 25,
+    "start_line": 650,
+    "end_line": 658,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "&#35; &#1234; &#992; &#0;\n",
+    "html": "<p># Ӓ Ϡ �</p>\n",
+    "example": 26,
+    "start_line": 669,
+    "end_line": 673,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "&#X22; &#XD06; &#xcab;\n",
+    "html": "<p>&quot; ആ ಫ</p>\n",
+    "example": 27,
+    "start_line": 682,
+    "end_line": 686,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "&nbsp &x; &#; &#x;\n&#87654321;\n&#abcdef0;\n&ThisIsNotDefined; &hi?;\n",
+    "html": "<p>&amp;nbsp &amp;x; &amp;#; &amp;#x;\n&amp;#87654321;\n&amp;#abcdef0;\n&amp;ThisIsNotDefined; &amp;hi?;</p>\n",
+    "example": 28,
+    "start_line": 691,
+    "end_line": 701,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "&copy\n",
+    "html": "<p>&amp;copy</p>\n",
+    "example": 29,
+    "start_line": 708,
+    "end_line": 712,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "&MadeUpEntity;\n",
+    "html": "<p>&amp;MadeUpEntity;</p>\n",
+    "example": 30,
+    "start_line": 718,
+    "end_line": 722,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "<a href=\"&ouml;&ouml;.html\">\n",
+    "html": "<a href=\"&ouml;&ouml;.html\">\n",
+    "example": 31,
+    "start_line": 729,
+    "end_line": 733,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "[foo](/f&ouml;&ouml; \"f&ouml;&ouml;\")\n",
+    "html": "<p><a href=\"/f%C3%B6%C3%B6\" title=\"föö\">foo</a></p>\n",
+    "example": 32,
+    "start_line": 736,
+    "end_line": 740,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "[foo]\n\n[foo]: /f&ouml;&ouml; \"f&ouml;&ouml;\"\n",
+    "html": "<p><a href=\"/f%C3%B6%C3%B6\" title=\"föö\">foo</a></p>\n",
+    "example": 33,
+    "start_line": 743,
+    "end_line": 749,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "``` f&ouml;&ouml;\nfoo\n```\n",
+    "html": "<pre><code class=\"language-föö\">foo\n</code></pre>\n",
+    "example": 34,
+    "start_line": 752,
+    "end_line": 759,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "`f&ouml;&ouml;`\n",
+    "html": "<p><code>f&amp;ouml;&amp;ouml;</code></p>\n",
+    "example": 35,
+    "start_line": 765,
+    "end_line": 769,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "    f&ouml;f&ouml;\n",
+    "html": "<pre><code>f&amp;ouml;f&amp;ouml;\n</code></pre>\n",
+    "example": 36,
+    "start_line": 772,
+    "end_line": 777,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "&#42;foo&#42;\n*foo*\n",
+    "html": "<p>*foo*\n<em>foo</em></p>\n",
+    "example": 37,
+    "start_line": 784,
+    "end_line": 790,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "&#42; foo\n\n* foo\n",
+    "html": "<p>* foo</p>\n<ul>\n<li>foo</li>\n</ul>\n",
+    "example": 38,
+    "start_line": 792,
+    "end_line": 801,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "foo&#10;&#10;bar\n",
+    "html": "<p>foo\n\nbar</p>\n",
+    "example": 39,
+    "start_line": 803,
+    "end_line": 809,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "&#9;foo\n",
+    "html": "<p>\tfoo</p>\n",
+    "example": 40,
+    "start_line": 811,
+    "end_line": 815,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "[a](url &quot;tit&quot;)\n",
+    "html": "<p>[a](url &quot;tit&quot;)</p>\n",
+    "example": 41,
+    "start_line": 818,
+    "end_line": 822,
+    "section": "Entity and numeric character references"
+  },
+  {
+    "markdown": "- `one\n- two`\n",
+    "html": "<ul>\n<li>`one</li>\n<li>two`</li>\n</ul>\n",
+    "example": 42,
+    "start_line": 841,
+    "end_line": 849,
+    "section": "Precedence"
+  },
+  {
+    "markdown": "***\n---\n___\n",
+    "html": "<hr />\n<hr />\n<hr />\n",
+    "example": 43,
+    "start_line": 880,
+    "end_line": 888,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": "+++\n",
+    "html": "<p>+++</p>\n",
+    "example": 44,
+    "start_line": 893,
+    "end_line": 897,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": "===\n",
+    "html": "<p>===</p>\n",
+    "example": 45,
+    "start_line": 900,
+    "end_line": 904,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": "--\n**\n__\n",
+    "html": "<p>--\n**\n__</p>\n",
+    "example": 46,
+    "start_line": 909,
+    "end_line": 917,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": " ***\n  ***\n   ***\n",
+    "html": "<hr />\n<hr />\n<hr />\n",
+    "example": 47,
+    "start_line": 922,
+    "end_line": 930,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": "    ***\n",
+    "html": "<pre><code>***\n</code></pre>\n",
+    "example": 48,
+    "start_line": 935,
+    "end_line": 940,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": "Foo\n    ***\n",
+    "html": "<p>Foo\n***</p>\n",
+    "example": 49,
+    "start_line": 943,
+    "end_line": 949,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": "_____________________________________\n",
+    "html": "<hr />\n",
+    "example": 50,
+    "start_line": 954,
+    "end_line": 958,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": " - - -\n",
+    "html": "<hr />\n",
+    "example": 51,
+    "start_line": 963,
+    "end_line": 967,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": " **  * ** * ** * **\n",
+    "html": "<hr />\n",
+    "example": 52,
+    "start_line": 970,
+    "end_line": 974,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": "-     -      -      -\n",
+    "html": "<hr />\n",
+    "example": 53,
+    "start_line": 977,
+    "end_line": 981,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": "- - - -    \n",
+    "html": "<hr />\n",
+    "example": 54,
+    "start_line": 986,
+    "end_line": 990,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": "_ _ _ _ a\n\na------\n\n---a---\n",
+    "html": "<p>_ _ _ _ a</p>\n<p>a------</p>\n<p>---a---</p>\n",
+    "example": 55,
+    "start_line": 995,
+    "end_line": 1005,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": " *-*\n",
+    "html": "<p><em>-</em></p>\n",
+    "example": 56,
+    "start_line": 1011,
+    "end_line": 1015,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": "- foo\n***\n- bar\n",
+    "html": "<ul>\n<li>foo</li>\n</ul>\n<hr />\n<ul>\n<li>bar</li>\n</ul>\n",
+    "example": 57,
+    "start_line": 1020,
+    "end_line": 1032,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": "Foo\n***\nbar\n",
+    "html": "<p>Foo</p>\n<hr />\n<p>bar</p>\n",
+    "example": 58,
+    "start_line": 1037,
+    "end_line": 1045,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": "Foo\n---\nbar\n",
+    "html": "<h2>Foo</h2>\n<p>bar</p>\n",
+    "example": 59,
+    "start_line": 1054,
+    "end_line": 1061,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": "* Foo\n* * *\n* Bar\n",
+    "html": "<ul>\n<li>Foo</li>\n</ul>\n<hr />\n<ul>\n<li>Bar</li>\n</ul>\n",
+    "example": 60,
+    "start_line": 1067,
+    "end_line": 1079,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": "- Foo\n- * * *\n",
+    "html": "<ul>\n<li>Foo</li>\n<li>\n<hr />\n</li>\n</ul>\n",
+    "example": 61,
+    "start_line": 1084,
+    "end_line": 1094,
+    "section": "Thematic breaks"
+  },
+  {
+    "markdown": "# foo\n## foo\n### foo\n#### foo\n##### foo\n###### foo\n",
+    "html": "<h1>foo</h1>\n<h2>foo</h2>\n<h3>foo</h3>\n<h4>foo</h4>\n<h5>foo</h5>\n<h6>foo</h6>\n",
+    "example": 62,
+    "start_line": 1113,
+    "end_line": 1127,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "####### foo\n",
+    "html": "<p>####### foo</p>\n",
+    "example": 63,
+    "start_line": 1132,
+    "end_line": 1136,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "#5 bolt\n\n#hashtag\n",
+    "html": "<p>#5 bolt</p>\n<p>#hashtag</p>\n",
+    "example": 64,
+    "start_line": 1147,
+    "end_line": 1154,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "\\## foo\n",
+    "html": "<p>## foo</p>\n",
+    "example": 65,
+    "start_line": 1159,
+    "end_line": 1163,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "# foo *bar* \\*baz\\*\n",
+    "html": "<h1>foo <em>bar</em> *baz*</h1>\n",
+    "example": 66,
+    "start_line": 1168,
+    "end_line": 1172,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "#                  foo                     \n",
+    "html": "<h1>foo</h1>\n",
+    "example": 67,
+    "start_line": 1177,
+    "end_line": 1181,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": " ### foo\n  ## foo\n   # foo\n",
+    "html": "<h3>foo</h3>\n<h2>foo</h2>\n<h1>foo</h1>\n",
+    "example": 68,
+    "start_line": 1186,
+    "end_line": 1194,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "    # foo\n",
+    "html": "<pre><code># foo\n</code></pre>\n",
+    "example": 69,
+    "start_line": 1199,
+    "end_line": 1204,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "foo\n    # bar\n",
+    "html": "<p>foo\n# bar</p>\n",
+    "example": 70,
+    "start_line": 1207,
+    "end_line": 1213,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "## foo ##\n  ###   bar    ###\n",
+    "html": "<h2>foo</h2>\n<h3>bar</h3>\n",
+    "example": 71,
+    "start_line": 1218,
+    "end_line": 1224,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "# foo ##################################\n##### foo ##\n",
+    "html": "<h1>foo</h1>\n<h5>foo</h5>\n",
+    "example": 72,
+    "start_line": 1229,
+    "end_line": 1235,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "### foo ###     \n",
+    "html": "<h3>foo</h3>\n",
+    "example": 73,
+    "start_line": 1240,
+    "end_line": 1244,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "### foo ### b\n",
+    "html": "<h3>foo ### b</h3>\n",
+    "example": 74,
+    "start_line": 1251,
+    "end_line": 1255,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "# foo#\n",
+    "html": "<h1>foo#</h1>\n",
+    "example": 75,
+    "start_line": 1260,
+    "end_line": 1264,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "### foo \\###\n## foo #\\##\n# foo \\#\n",
+    "html": "<h3>foo ###</h3>\n<h2>foo ###</h2>\n<h1>foo #</h1>\n",
+    "example": 76,
+    "start_line": 1270,
+    "end_line": 1278,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "****\n## foo\n****\n",
+    "html": "<hr />\n<h2>foo</h2>\n<hr />\n",
+    "example": 77,
+    "start_line": 1284,
+    "end_line": 1292,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "Foo bar\n# baz\nBar foo\n",
+    "html": "<p>Foo bar</p>\n<h1>baz</h1>\n<p>Bar foo</p>\n",
+    "example": 78,
+    "start_line": 1295,
+    "end_line": 1303,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "## \n#\n### ###\n",
+    "html": "<h2></h2>\n<h1></h1>\n<h3></h3>\n",
+    "example": 79,
+    "start_line": 1308,
+    "end_line": 1316,
+    "section": "ATX headings"
+  },
+  {
+    "markdown": "Foo *bar*\n=========\n\nFoo *bar*\n---------\n",
+    "html": "<h1>Foo <em>bar</em></h1>\n<h2>Foo <em>bar</em></h2>\n",
+    "example": 80,
+    "start_line": 1351,
+    "end_line": 1360,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "Foo *bar\nbaz*\n====\n",
+    "html": "<h1>Foo <em>bar\nbaz</em></h1>\n",
+    "example": 81,
+    "start_line": 1365,
+    "end_line": 1372,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "  Foo *bar\nbaz*\t\n====\n",
+    "html": "<h1>Foo <em>bar\nbaz</em></h1>\n",
+    "example": 82,
+    "start_line": 1379,
+    "end_line": 1386,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "Foo\n-------------------------\n\nFoo\n=\n",
+    "html": "<h2>Foo</h2>\n<h1>Foo</h1>\n",
+    "example": 83,
+    "start_line": 1391,
+    "end_line": 1400,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "   Foo\n---\n\n  Foo\n-----\n\n  Foo\n  ===\n",
+    "html": "<h2>Foo</h2>\n<h2>Foo</h2>\n<h1>Foo</h1>\n",
+    "example": 84,
+    "start_line": 1406,
+    "end_line": 1419,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "    Foo\n    ---\n\n    Foo\n---\n",
+    "html": "<pre><code>Foo\n---\n\nFoo\n</code></pre>\n<hr />\n",
+    "example": 85,
+    "start_line": 1424,
+    "end_line": 1437,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "Foo\n   ----      \n",
+    "html": "<h2>Foo</h2>\n",
+    "example": 86,
+    "start_line": 1443,
+    "end_line": 1448,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "Foo\n    ---\n",
+    "html": "<p>Foo\n---</p>\n",
+    "example": 87,
+    "start_line": 1453,
+    "end_line": 1459,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "Foo\n= =\n\nFoo\n--- -\n",
+    "html": "<p>Foo\n= =</p>\n<p>Foo</p>\n<hr />\n",
+    "example": 88,
+    "start_line": 1464,
+    "end_line": 1475,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "Foo  \n-----\n",
+    "html": "<h2>Foo</h2>\n",
+    "example": 89,
+    "start_line": 1480,
+    "end_line": 1485,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "Foo\\\n----\n",
+    "html": "<h2>Foo\\</h2>\n",
+    "example": 90,
+    "start_line": 1490,
+    "end_line": 1495,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "`Foo\n----\n`\n\n<a title=\"a lot\n---\nof dashes\"/>\n",
+    "html": "<h2>`Foo</h2>\n<p>`</p>\n<h2>&lt;a title=&quot;a lot</h2>\n<p>of dashes&quot;/&gt;</p>\n",
+    "example": 91,
+    "start_line": 1501,
+    "end_line": 1514,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "> Foo\n---\n",
+    "html": "<blockquote>\n<p>Foo</p>\n</blockquote>\n<hr />\n",
+    "example": 92,
+    "start_line": 1520,
+    "end_line": 1528,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "> foo\nbar\n===\n",
+    "html": "<blockquote>\n<p>foo\nbar\n===</p>\n</blockquote>\n",
+    "example": 93,
+    "start_line": 1531,
+    "end_line": 1541,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "- Foo\n---\n",
+    "html": "<ul>\n<li>Foo</li>\n</ul>\n<hr />\n",
+    "example": 94,
+    "start_line": 1544,
+    "end_line": 1552,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "Foo\nBar\n---\n",
+    "html": "<h2>Foo\nBar</h2>\n",
+    "example": 95,
+    "start_line": 1559,
+    "end_line": 1566,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "---\nFoo\n---\nBar\n---\nBaz\n",
+    "html": "<hr />\n<h2>Foo</h2>\n<h2>Bar</h2>\n<p>Baz</p>\n",
+    "example": 96,
+    "start_line": 1572,
+    "end_line": 1584,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "\n====\n",
+    "html": "<p>====</p>\n",
+    "example": 97,
+    "start_line": 1589,
+    "end_line": 1594,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "---\n---\n",
+    "html": "<hr />\n<hr />\n",
+    "example": 98,
+    "start_line": 1601,
+    "end_line": 1607,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "- foo\n-----\n",
+    "html": "<ul>\n<li>foo</li>\n</ul>\n<hr />\n",
+    "example": 99,
+    "start_line": 1610,
+    "end_line": 1618,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "    foo\n---\n",
+    "html": "<pre><code>foo\n</code></pre>\n<hr />\n",
+    "example": 100,
+    "start_line": 1621,
+    "end_line": 1628,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "> foo\n-----\n",
+    "html": "<blockquote>\n<p>foo</p>\n</blockquote>\n<hr />\n",
+    "example": 101,
+    "start_line": 1631,
+    "end_line": 1639,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "\\> foo\n------\n",
+    "html": "<h2>&gt; foo</h2>\n",
+    "example": 102,
+    "start_line": 1645,
+    "end_line": 1650,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "Foo\n\nbar\n---\nbaz\n",
+    "html": "<p>Foo</p>\n<h2>bar</h2>\n<p>baz</p>\n",
+    "example": 103,
+    "start_line": 1676,
+    "end_line": 1686,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "Foo\nbar\n\n---\n\nbaz\n",
+    "html": "<p>Foo\nbar</p>\n<hr />\n<p>baz</p>\n",
+    "example": 104,
+    "start_line": 1692,
+    "end_line": 1704,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "Foo\nbar\n* * *\nbaz\n",
+    "html": "<p>Foo\nbar</p>\n<hr />\n<p>baz</p>\n",
+    "example": 105,
+    "start_line": 1710,
+    "end_line": 1720,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "Foo\nbar\n\\---\nbaz\n",
+    "html": "<p>Foo\nbar\n---\nbaz</p>\n",
+    "example": 106,
+    "start_line": 1725,
+    "end_line": 1735,
+    "section": "Setext headings"
+  },
+  {
+    "markdown": "    a simple\n      indented code block\n",
+    "html": "<pre><code>a simple\n  indented code block\n</code></pre>\n",
+    "example": 107,
+    "start_line": 1753,
+    "end_line": 1760,
+    "section": "Indented code blocks"
+  },
+  {
+    "markdown": "  - foo\n\n    bar\n",
+    "html": "<ul>\n<li>\n<p>foo</p>\n<p>bar</p>\n</li>\n</ul>\n",
+    "example": 108,
+    "start_line": 1767,
+    "end_line": 1778,
+    "section": "Indented code blocks"
+  },
+  {
+    "markdown": "1.  foo\n\n    - bar\n",
+    "html": "<ol>\n<li>\n<p>foo</p>\n<ul>\n<li>bar</li>\n</ul>\n</li>\n</ol>\n",
+    "example": 109,
+    "start_line": 1781,
+    "end_line": 1794,
+    "section": "Indented code blocks"
+  },
+  {
+    "markdown": "    <a/>\n    *hi*\n\n    - one\n",
+    "html": "<pre><code>&lt;a/&gt;\n*hi*\n\n- one\n</code></pre>\n",
+    "example": 110,
+    "start_line": 1801,
+    "end_line": 1812,
+    "section": "Indented code blocks"
+  },
+  {
+    "markdown": "    chunk1\n\n    chunk2\n  \n \n \n    chunk3\n",
+    "html": "<pre><code>chunk1\n\nchunk2\n\n\n\nchunk3\n</code></pre>\n",
+    "example": 111,
+    "start_line": 1817,
+    "end_line": 1834,
+    "section": "Indented code blocks"
+  },
+  {
+    "markdown": "    chunk1\n      \n      chunk2\n",
+    "html": "<pre><code>chunk1\n  \n  chunk2\n</code></pre>\n",
+    "example": 112,
+    "start_line": 1840,
+    "end_line": 1849,
+    "section": "Indented code blocks"
+  },
+  {
+    "markdown": "Foo\n    bar\n\n",
+    "html": "<p>Foo\nbar</p>\n",
+    "example": 113,
+    "start_line": 1855,
+    "end_line": 1862,
+    "section": "Indented code blocks"
+  },
+  {
+    "markdown": "    foo\nbar\n",
+    "html": "<pre><code>foo\n</code></pre>\n<p>bar</p>\n",
+    "example": 114,
+    "start_line": 1869,
+    "end_line": 1876,
+    "section": "Indented code blocks"
+  },
+  {
+    "markdown": "# Heading\n    foo\nHeading\n------\n    foo\n----\n",
+    "html": "<h1>Heading</h1>\n<pre><code>foo\n</code></pre>\n<h2>Heading</h2>\n<pre><code>foo\n</code></pre>\n<hr />\n",
+    "example": 115,
+    "start_line": 1882,
+    "end_line": 1897,
+    "section": "Indented code blocks"
+  },
+  {
+    "markdown": "        foo\n    bar\n",
+    "html": "<pre><code>    foo\nbar\n</code></pre>\n",
+    "example": 116,
+    "start_line": 1902,
+    "end_line": 1909,
+    "section": "Indented code blocks"
+  },
+  {
+    "markdown": "\n    \n    foo\n    \n\n",
+    "html": "<pre><code>foo\n</code></pre>\n",
+    "example": 117,
+    "start_line": 1915,
+    "end_line": 1924,
+    "section": "Indented code blocks"
+  },
+  {
+    "markdown": "    foo  \n",
+    "html": "<pre><code>foo  \n</code></pre>\n",
+    "example": 118,
+    "start_line": 1929,
+    "end_line": 1934,
+    "section": "Indented code blocks"
+  },
+  {
+    "markdown": "```\n<\n >\n```\n",
+    "html": "<pre><code>&lt;\n &gt;\n</code></pre>\n",
+    "example": 119,
+    "start_line": 1984,
+    "end_line": 1993,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "~~~\n<\n >\n~~~\n",
+    "html": "<pre><code>&lt;\n &gt;\n</code></pre>\n",
+    "example": 120,
+    "start_line": 1998,
+    "end_line": 2007,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "``\nfoo\n``\n",
+    "html": "<p><code>foo</code></p>\n",
+    "example": 121,
+    "start_line": 2011,
+    "end_line": 2017,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "```\naaa\n~~~\n```\n",
+    "html": "<pre><code>aaa\n~~~\n</code></pre>\n",
+    "example": 122,
+    "start_line": 2022,
+    "end_line": 2031,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "~~~\naaa\n```\n~~~\n",
+    "html": "<pre><code>aaa\n```\n</code></pre>\n",
+    "example": 123,
+    "start_line": 2034,
+    "end_line": 2043,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "````\naaa\n```\n``````\n",
+    "html": "<pre><code>aaa\n```\n</code></pre>\n",
+    "example": 124,
+    "start_line": 2048,
+    "end_line": 2057,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "~~~~\naaa\n~~~\n~~~~\n",
+    "html": "<pre><code>aaa\n~~~\n</code></pre>\n",
+    "example": 125,
+    "start_line": 2060,
+    "end_line": 2069,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "```\n",
+    "html": "<pre><code></code></pre>\n",
+    "example": 126,
+    "start_line": 2075,
+    "end_line": 2079,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "`````\n\n```\naaa\n",
+    "html": "<pre><code>\n```\naaa\n</code></pre>\n",
+    "example": 127,
+    "start_line": 2082,
+    "end_line": 2092,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "> ```\n> aaa\n\nbbb\n",
+    "html": "<blockquote>\n<pre><code>aaa\n</code></pre>\n</blockquote>\n<p>bbb</p>\n",
+    "example": 128,
+    "start_line": 2095,
+    "end_line": 2106,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "```\n\n  \n```\n",
+    "html": "<pre><code>\n  \n</code></pre>\n",
+    "example": 129,
+    "start_line": 2111,
+    "end_line": 2120,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "```\n```\n",
+    "html": "<pre><code></code></pre>\n",
+    "example": 130,
+    "start_line": 2125,
+    "end_line": 2130,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": " ```\n aaa\naaa\n```\n",
+    "html": "<pre><code>aaa\naaa\n</code></pre>\n",
+    "example": 131,
+    "start_line": 2137,
+    "end_line": 2146,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "  ```\naaa\n  aaa\naaa\n  ```\n",
+    "html": "<pre><code>aaa\naaa\naaa\n</code></pre>\n",
+    "example": 132,
+    "start_line": 2149,
+    "end_line": 2160,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "   ```\n   aaa\n    aaa\n  aaa\n   ```\n",
+    "html": "<pre><code>aaa\n aaa\naaa\n</code></pre>\n",
+    "example": 133,
+    "start_line": 2163,
+    "end_line": 2174,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "    ```\n    aaa\n    ```\n",
+    "html": "<pre><code>```\naaa\n```\n</code></pre>\n",
+    "example": 134,
+    "start_line": 2179,
+    "end_line": 2188,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "```\naaa\n  ```\n",
+    "html": "<pre><code>aaa\n</code></pre>\n",
+    "example": 135,
+    "start_line": 2194,
+    "end_line": 2201,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "   ```\naaa\n  ```\n",
+    "html": "<pre><code>aaa\n</code></pre>\n",
+    "example": 136,
+    "start_line": 2204,
+    "end_line": 2211,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "```\naaa\n    ```\n",
+    "html": "<pre><code>aaa\n    ```\n</code></pre>\n",
+    "example": 137,
+    "start_line": 2216,
+    "end_line": 2224,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "``` ```\naaa\n",
+    "html": "<p><code> </code>\naaa</p>\n",
+    "example": 138,
+    "start_line": 2230,
+    "end_line": 2236,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "~~~~~~\naaa\n~~~ ~~\n",
+    "html": "<pre><code>aaa\n~~~ ~~\n</code></pre>\n",
+    "example": 139,
+    "start_line": 2239,
+    "end_line": 2247,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "foo\n```\nbar\n```\nbaz\n",
+    "html": "<p>foo</p>\n<pre><code>bar\n</code></pre>\n<p>baz</p>\n",
+    "example": 140,
+    "start_line": 2253,
+    "end_line": 2264,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "foo\n---\n~~~\nbar\n~~~\n# baz\n",
+    "html": "<h2>foo</h2>\n<pre><code>bar\n</code></pre>\n<h1>baz</h1>\n",
+    "example": 141,
+    "start_line": 2270,
+    "end_line": 2282,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "```ruby\ndef foo(x)\n  return 3\nend\n```\n",
+    "html": "<pre><code class=\"language-ruby\">def foo(x)\n  return 3\nend\n</code></pre>\n",
+    "example": 142,
+    "start_line": 2292,
+    "end_line": 2303,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "~~~~    ruby startline=3 $%@#$\ndef foo(x)\n  return 3\nend\n~~~~~~~\n",
+    "html": "<pre><code class=\"language-ruby\">def foo(x)\n  return 3\nend\n</code></pre>\n",
+    "example": 143,
+    "start_line": 2306,
+    "end_line": 2317,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "````;\n````\n",
+    "html": "<pre><code class=\"language-;\"></code></pre>\n",
+    "example": 144,
+    "start_line": 2320,
+    "end_line": 2325,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "``` aa ```\nfoo\n",
+    "html": "<p><code>aa</code>\nfoo</p>\n",
+    "example": 145,
+    "start_line": 2330,
+    "end_line": 2336,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "~~~ aa ``` ~~~\nfoo\n~~~\n",
+    "html": "<pre><code class=\"language-aa\">foo\n</code></pre>\n",
+    "example": 146,
+    "start_line": 2341,
+    "end_line": 2348,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "```\n``` aaa\n```\n",
+    "html": "<pre><code>``` aaa\n</code></pre>\n",
+    "example": 147,
+    "start_line": 2353,
+    "end_line": 2360,
+    "section": "Fenced code blocks"
+  },
+  {
+    "markdown": "<table><tr><td>\n<pre>\n**Hello**,\n\n_world_.\n</pre>\n</td></tr></table>\n",
+    "html": "<table><tr><td>\n<pre>\n**Hello**,\n<p><em>world</em>.\n</pre></p>\n</td></tr></table>\n",
+    "example": 148,
+    "start_line": 2432,
+    "end_line": 2447,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<table>\n  <tr>\n    <td>\n           hi\n    </td>\n  </tr>\n</table>\n\nokay.\n",
+    "html": "<table>\n  <tr>\n    <td>\n           hi\n    </td>\n  </tr>\n</table>\n<p>okay.</p>\n",
+    "example": 149,
+    "start_line": 2461,
+    "end_line": 2480,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": " <div>\n  *hello*\n         <foo><a>\n",
+    "html": " <div>\n  *hello*\n         <foo><a>\n",
+    "example": 150,
+    "start_line": 2483,
+    "end_line": 2491,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "</div>\n*foo*\n",
+    "html": "</div>\n*foo*\n",
+    "example": 151,
+    "start_line": 2496,
+    "end_line": 2502,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<DIV CLASS=\"foo\">\n\n*Markdown*\n\n</DIV>\n",
+    "html": "<DIV CLASS=\"foo\">\n<p><em>Markdown</em></p>\n</DIV>\n",
+    "example": 152,
+    "start_line": 2507,
+    "end_line": 2517,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<div id=\"foo\"\n  class=\"bar\">\n</div>\n",
+    "html": "<div id=\"foo\"\n  class=\"bar\">\n</div>\n",
+    "example": 153,
+    "start_line": 2523,
+    "end_line": 2531,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<div id=\"foo\" class=\"bar\n  baz\">\n</div>\n",
+    "html": "<div id=\"foo\" class=\"bar\n  baz\">\n</div>\n",
+    "example": 154,
+    "start_line": 2534,
+    "end_line": 2542,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<div>\n*foo*\n\n*bar*\n",
+    "html": "<div>\n*foo*\n<p><em>bar</em></p>\n",
+    "example": 155,
+    "start_line": 2546,
+    "end_line": 2555,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<div id=\"foo\"\n*hi*\n",
+    "html": "<div id=\"foo\"\n*hi*\n",
+    "example": 156,
+    "start_line": 2562,
+    "end_line": 2568,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<div class\nfoo\n",
+    "html": "<div class\nfoo\n",
+    "example": 157,
+    "start_line": 2571,
+    "end_line": 2577,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<div *???-&&&-<---\n*foo*\n",
+    "html": "<div *???-&&&-<---\n*foo*\n",
+    "example": 158,
+    "start_line": 2583,
+    "end_line": 2589,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<div><a href=\"bar\">*foo*</a></div>\n",
+    "html": "<div><a href=\"bar\">*foo*</a></div>\n",
+    "example": 159,
+    "start_line": 2595,
+    "end_line": 2599,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<table><tr><td>\nfoo\n</td></tr></table>\n",
+    "html": "<table><tr><td>\nfoo\n</td></tr></table>\n",
+    "example": 160,
+    "start_line": 2602,
+    "end_line": 2610,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<div></div>\n``` c\nint x = 33;\n```\n",
+    "html": "<div></div>\n``` c\nint x = 33;\n```\n",
+    "example": 161,
+    "start_line": 2619,
+    "end_line": 2629,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<a href=\"foo\">\n*bar*\n</a>\n",
+    "html": "<a href=\"foo\">\n*bar*\n</a>\n",
+    "example": 162,
+    "start_line": 2636,
+    "end_line": 2644,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<Warning>\n*bar*\n</Warning>\n",
+    "html": "<Warning>\n*bar*\n</Warning>\n",
+    "example": 163,
+    "start_line": 2649,
+    "end_line": 2657,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<i class=\"foo\">\n*bar*\n</i>\n",
+    "html": "<i class=\"foo\">\n*bar*\n</i>\n",
+    "example": 164,
+    "start_line": 2660,
+    "end_line": 2668,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "</ins>\n*bar*\n",
+    "html": "</ins>\n*bar*\n",
+    "example": 165,
+    "start_line": 2671,
+    "end_line": 2677,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<del>\n*foo*\n</del>\n",
+    "html": "<del>\n*foo*\n</del>\n",
+    "example": 166,
+    "start_line": 2686,
+    "end_line": 2694,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<del>\n\n*foo*\n\n</del>\n",
+    "html": "<del>\n<p><em>foo</em></p>\n</del>\n",
+    "example": 167,
+    "start_line": 2701,
+    "end_line": 2711,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<del>*foo*</del>\n",
+    "html": "<p><del><em>foo</em></del></p>\n",
+    "example": 168,
+    "start_line": 2719,
+    "end_line": 2723,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<pre language=\"haskell\"><code>\nimport Text.HTML.TagSoup\n\nmain :: IO ()\nmain = print $ parseTags tags\n</code></pre>\nokay\n",
+    "html": "<pre language=\"haskell\"><code>\nimport Text.HTML.TagSoup\n\nmain :: IO ()\nmain = print $ parseTags tags\n</code></pre>\n<p>okay</p>\n",
+    "example": 169,
+    "start_line": 2735,
+    "end_line": 2751,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<script type=\"text/javascript\">\n// JavaScript example\n\ndocument.getElementById(\"demo\").innerHTML = \"Hello JavaScript!\";\n</script>\nokay\n",
+    "html": "<script type=\"text/javascript\">\n// JavaScript example\n\ndocument.getElementById(\"demo\").innerHTML = \"Hello JavaScript!\";\n</script>\n<p>okay</p>\n",
+    "example": 170,
+    "start_line": 2756,
+    "end_line": 2770,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<textarea>\n\n*foo*\n\n_bar_\n\n</textarea>\n",
+    "html": "<textarea>\n\n*foo*\n\n_bar_\n\n</textarea>\n",
+    "example": 171,
+    "start_line": 2775,
+    "end_line": 2791,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<style\n  type=\"text/css\">\nh1 {color:red;}\n\np {color:blue;}\n</style>\nokay\n",
+    "html": "<style\n  type=\"text/css\">\nh1 {color:red;}\n\np {color:blue;}\n</style>\n<p>okay</p>\n",
+    "example": 172,
+    "start_line": 2795,
+    "end_line": 2811,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<style\n  type=\"text/css\">\n\nfoo\n",
+    "html": "<style\n  type=\"text/css\">\n\nfoo\n",
+    "example": 173,
+    "start_line": 2818,
+    "end_line": 2828,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "> <div>\n> foo\n\nbar\n",
+    "html": "<blockquote>\n<div>\nfoo\n</blockquote>\n<p>bar</p>\n",
+    "example": 174,
+    "start_line": 2831,
+    "end_line": 2842,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "- <div>\n- foo\n",
+    "html": "<ul>\n<li>\n<div>\n</li>\n<li>foo</li>\n</ul>\n",
+    "example": 175,
+    "start_line": 2845,
+    "end_line": 2855,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<style>p{color:red;}</style>\n*foo*\n",
+    "html": "<style>p{color:red;}</style>\n<p><em>foo</em></p>\n",
+    "example": 176,
+    "start_line": 2860,
+    "end_line": 2866,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<!-- foo -->*bar*\n*baz*\n",
+    "html": "<!-- foo -->*bar*\n<p><em>baz</em></p>\n",
+    "example": 177,
+    "start_line": 2869,
+    "end_line": 2875,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<script>\nfoo\n</script>1. *bar*\n",
+    "html": "<script>\nfoo\n</script>1. *bar*\n",
+    "example": 178,
+    "start_line": 2881,
+    "end_line": 2889,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<!-- Foo\n\nbar\n   baz -->\nokay\n",
+    "html": "<!-- Foo\n\nbar\n   baz -->\n<p>okay</p>\n",
+    "example": 179,
+    "start_line": 2894,
+    "end_line": 2906,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<?php\n\n  echo '>';\n\n?>\nokay\n",
+    "html": "<?php\n\n  echo '>';\n\n?>\n<p>okay</p>\n",
+    "example": 180,
+    "start_line": 2912,
+    "end_line": 2926,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<!DOCTYPE html>\n",
+    "html": "<!DOCTYPE html>\n",
+    "example": 181,
+    "start_line": 2931,
+    "end_line": 2935,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<![CDATA[\nfunction matchwo(a,b)\n{\n  if (a < b && a < 0) then {\n    return 1;\n\n  } else {\n\n    return 0;\n  }\n}\n]]>\nokay\n",
+    "html": "<![CDATA[\nfunction matchwo(a,b)\n{\n  if (a < b && a < 0) then {\n    return 1;\n\n  } else {\n\n    return 0;\n  }\n}\n]]>\n<p>okay</p>\n",
+    "example": 182,
+    "start_line": 2940,
+    "end_line": 2968,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "  <!-- foo -->\n\n    <!-- foo -->\n",
+    "html": "  <!-- foo -->\n<pre><code>&lt;!-- foo --&gt;\n</code></pre>\n",
+    "example": 183,
+    "start_line": 2974,
+    "end_line": 2982,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "  <div>\n\n    <div>\n",
+    "html": "  <div>\n<pre><code>&lt;div&gt;\n</code></pre>\n",
+    "example": 184,
+    "start_line": 2985,
+    "end_line": 2993,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "Foo\n<div>\nbar\n</div>\n",
+    "html": "<p>Foo</p>\n<div>\nbar\n</div>\n",
+    "example": 185,
+    "start_line": 2999,
+    "end_line": 3009,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<div>\nbar\n</div>\n*foo*\n",
+    "html": "<div>\nbar\n</div>\n*foo*\n",
+    "example": 186,
+    "start_line": 3016,
+    "end_line": 3026,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "Foo\n<a href=\"bar\">\nbaz\n",
+    "html": "<p>Foo\n<a href=\"bar\">\nbaz</p>\n",
+    "example": 187,
+    "start_line": 3031,
+    "end_line": 3039,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<div>\n\n*Emphasized* text.\n\n</div>\n",
+    "html": "<div>\n<p><em>Emphasized</em> text.</p>\n</div>\n",
+    "example": 188,
+    "start_line": 3072,
+    "end_line": 3082,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<div>\n*Emphasized* text.\n</div>\n",
+    "html": "<div>\n*Emphasized* text.\n</div>\n",
+    "example": 189,
+    "start_line": 3085,
+    "end_line": 3093,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<table>\n\n<tr>\n\n<td>\nHi\n</td>\n\n</tr>\n\n</table>\n",
+    "html": "<table>\n<tr>\n<td>\nHi\n</td>\n</tr>\n</table>\n",
+    "example": 190,
+    "start_line": 3107,
+    "end_line": 3127,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "<table>\n\n  <tr>\n\n    <td>\n      Hi\n    </td>\n\n  </tr>\n\n</table>\n",
+    "html": "<table>\n  <tr>\n<pre><code>&lt;td&gt;\n  Hi\n&lt;/td&gt;\n</code></pre>\n  </tr>\n</table>\n",
+    "example": 191,
+    "start_line": 3134,
+    "end_line": 3155,
+    "section": "HTML blocks"
+  },
+  {
+    "markdown": "[foo]: /url \"title\"\n\n[foo]\n",
+    "html": "<p><a href=\"/url\" title=\"title\">foo</a></p>\n",
+    "example": 192,
+    "start_line": 3183,
+    "end_line": 3189,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "   [foo]: \n      /url  \n           'the title'  \n\n[foo]\n",
+    "html": "<p><a href=\"/url\" title=\"the title\">foo</a></p>\n",
+    "example": 193,
+    "start_line": 3192,
+    "end_line": 3200,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[Foo*bar\\]]:my_(url) 'title (with parens)'\n\n[Foo*bar\\]]\n",
+    "html": "<p><a href=\"my_(url)\" title=\"title (with parens)\">Foo*bar]</a></p>\n",
+    "example": 194,
+    "start_line": 3203,
+    "end_line": 3209,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[Foo bar]:\n<my url>\n'title'\n\n[Foo bar]\n",
+    "html": "<p><a href=\"my%20url\" title=\"title\">Foo bar</a></p>\n",
+    "example": 195,
+    "start_line": 3212,
+    "end_line": 3220,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]: /url '\ntitle\nline1\nline2\n'\n\n[foo]\n",
+    "html": "<p><a href=\"/url\" title=\"\ntitle\nline1\nline2\n\">foo</a></p>\n",
+    "example": 196,
+    "start_line": 3225,
+    "end_line": 3239,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]: /url 'title\n\nwith blank line'\n\n[foo]\n",
+    "html": "<p>[foo]: /url 'title</p>\n<p>with blank line'</p>\n<p>[foo]</p>\n",
+    "example": 197,
+    "start_line": 3244,
+    "end_line": 3254,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]:\n/url\n\n[foo]\n",
+    "html": "<p><a href=\"/url\">foo</a></p>\n",
+    "example": 198,
+    "start_line": 3259,
+    "end_line": 3266,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]:\n\n[foo]\n",
+    "html": "<p>[foo]:</p>\n<p>[foo]</p>\n",
+    "example": 199,
+    "start_line": 3271,
+    "end_line": 3278,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]: <>\n\n[foo]\n",
+    "html": "<p><a href=\"\">foo</a></p>\n",
+    "example": 200,
+    "start_line": 3283,
+    "end_line": 3289,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]: <bar>(baz)\n\n[foo]\n",
+    "html": "<p>[foo]: <bar>(baz)</p>\n<p>[foo]</p>\n",
+    "example": 201,
+    "start_line": 3294,
+    "end_line": 3301,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]: /url\\bar\\*baz \"foo\\\"bar\\baz\"\n\n[foo]\n",
+    "html": "<p><a href=\"/url%5Cbar*baz\" title=\"foo&quot;bar\\baz\">foo</a></p>\n",
+    "example": 202,
+    "start_line": 3307,
+    "end_line": 3313,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]\n\n[foo]: url\n",
+    "html": "<p><a href=\"url\">foo</a></p>\n",
+    "example": 203,
+    "start_line": 3318,
+    "end_line": 3324,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]\n\n[foo]: first\n[foo]: second\n",
+    "html": "<p><a href=\"first\">foo</a></p>\n",
+    "example": 204,
+    "start_line": 3330,
+    "end_line": 3337,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[FOO]: /url\n\n[Foo]\n",
+    "html": "<p><a href=\"/url\">Foo</a></p>\n",
+    "example": 205,
+    "start_line": 3343,
+    "end_line": 3349,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[ΑΓΩ]: /φου\n\n[αγω]\n",
+    "html": "<p><a href=\"/%CF%86%CE%BF%CF%85\">αγω</a></p>\n",
+    "example": 206,
+    "start_line": 3352,
+    "end_line": 3358,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]: /url\n",
+    "html": "",
+    "example": 207,
+    "start_line": 3367,
+    "end_line": 3370,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[\nfoo\n]: /url\nbar\n",
+    "html": "<p>bar</p>\n",
+    "example": 208,
+    "start_line": 3375,
+    "end_line": 3382,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]: /url \"title\" ok\n",
+    "html": "<p>[foo]: /url &quot;title&quot; ok</p>\n",
+    "example": 209,
+    "start_line": 3388,
+    "end_line": 3392,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]: /url\n\"title\" ok\n",
+    "html": "<p>&quot;title&quot; ok</p>\n",
+    "example": 210,
+    "start_line": 3397,
+    "end_line": 3402,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "    [foo]: /url \"title\"\n\n[foo]\n",
+    "html": "<pre><code>[foo]: /url &quot;title&quot;\n</code></pre>\n<p>[foo]</p>\n",
+    "example": 211,
+    "start_line": 3408,
+    "end_line": 3416,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "```\n[foo]: /url\n```\n\n[foo]\n",
+    "html": "<pre><code>[foo]: /url\n</code></pre>\n<p>[foo]</p>\n",
+    "example": 212,
+    "start_line": 3422,
+    "end_line": 3432,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "Foo\n[bar]: /baz\n\n[bar]\n",
+    "html": "<p>Foo\n[bar]: /baz</p>\n<p>[bar]</p>\n",
+    "example": 213,
+    "start_line": 3437,
+    "end_line": 3446,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "# [Foo]\n[foo]: /url\n> bar\n",
+    "html": "<h1><a href=\"/url\">Foo</a></h1>\n<blockquote>\n<p>bar</p>\n</blockquote>\n",
+    "example": 214,
+    "start_line": 3452,
+    "end_line": 3461,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]: /url\nbar\n===\n[foo]\n",
+    "html": "<h1>bar</h1>\n<p><a href=\"/url\">foo</a></p>\n",
+    "example": 215,
+    "start_line": 3463,
+    "end_line": 3471,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]: /url\n===\n[foo]\n",
+    "html": "<p>===\n<a href=\"/url\">foo</a></p>\n",
+    "example": 216,
+    "start_line": 3473,
+    "end_line": 3480,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]: /foo-url \"foo\"\n[bar]: /bar-url\n  \"bar\"\n[baz]: /baz-url\n\n[foo],\n[bar],\n[baz]\n",
+    "html": "<p><a href=\"/foo-url\" title=\"foo\">foo</a>,\n<a href=\"/bar-url\" title=\"bar\">bar</a>,\n<a href=\"/baz-url\">baz</a></p>\n",
+    "example": 217,
+    "start_line": 3486,
+    "end_line": 3499,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "[foo]\n\n> [foo]: /url\n",
+    "html": "<p><a href=\"/url\">foo</a></p>\n<blockquote>\n</blockquote>\n",
+    "example": 218,
+    "start_line": 3507,
+    "end_line": 3515,
+    "section": "Link reference definitions"
+  },
+  {
+    "markdown": "aaa\n\nbbb\n",
+    "html": "<p>aaa</p>\n<p>bbb</p>\n",
+    "example": 219,
+    "start_line": 3529,
+    "end_line": 3536,
+    "section": "Paragraphs"
+  },
+  {
+    "markdown": "aaa\nbbb\n\nccc\nddd\n",
+    "html": "<p>aaa\nbbb</p>\n<p>ccc\nddd</p>\n",
+    "example": 220,
+    "start_line": 3541,
+    "end_line": 3552,
+    "section": "Paragraphs"
+  },
+  {
+    "markdown": "aaa\n\n\nbbb\n",
+    "html": "<p>aaa</p>\n<p>bbb</p>\n",
+    "example": 221,
+    "start_line": 3557,
+    "end_line": 3565,
+    "section": "Paragraphs"
+  },
+  {
+    "markdown": "  aaa\n bbb\n",
+    "html": "<p>aaa\nbbb</p>\n",
+    "example": 222,
+    "start_line": 3570,
+    "end_line": 3576,
+    "section": "Paragraphs"
+  },
+  {
+    "markdown": "aaa\n             bbb\n                                       ccc\n",
+    "html": "<p>aaa\nbbb\nccc</p>\n",
+    "example": 223,
+    "start_line": 3582,
+    "end_line": 3590,
+    "section": "Paragraphs"
+  },
+  {
+    "markdown": "   aaa\nbbb\n",
+    "html": "<p>aaa\nbbb</p>\n",
+    "example": 224,
+    "start_line": 3596,
+    "end_line": 3602,
+    "section": "Paragraphs"
+  },
+  {
+    "markdown": "    aaa\nbbb\n",
+    "html": "<pre><code>aaa\n</code></pre>\n<p>bbb</p>\n",
+    "example": 225,
+    "start_line": 3605,
+    "end_line": 3612,
+    "section": "Paragraphs"
+  },
+  {
+    "markdown": "aaa     \nbbb     \n",
+    "html": "<p>aaa<br />\nbbb</p>\n",
+    "example": 226,
+    "start_line": 3619,
+    "end_line": 3625,
+    "section": "Paragraphs"
+  },
+  {
+    "markdown": "  \n\naaa\n  \n\n# aaa\n\n  \n",
+    "html": "<p>aaa</p>\n<h1>aaa</h1>\n",
+    "example": 227,
+    "start_line": 3636,
+    "end_line": 3648,
+    "section": "Blank lines"
+  },
+  {
+    "markdown": "> # Foo\n> bar\n> baz\n",
+    "html": "<blockquote>\n<h1>Foo</h1>\n<p>bar\nbaz</p>\n</blockquote>\n",
+    "example": 228,
+    "start_line": 3704,
+    "end_line": 3714,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "># Foo\n>bar\n> baz\n",
+    "html": "<blockquote>\n<h1>Foo</h1>\n<p>bar\nbaz</p>\n</blockquote>\n",
+    "example": 229,
+    "start_line": 3719,
+    "end_line": 3729,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "   > # Foo\n   > bar\n > baz\n",
+    "html": "<blockquote>\n<h1>Foo</h1>\n<p>bar\nbaz</p>\n</blockquote>\n",
+    "example": 230,
+    "start_line": 3734,
+    "end_line": 3744,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "    > # Foo\n    > bar\n    > baz\n",
+    "html": "<pre><code>&gt; # Foo\n&gt; bar\n&gt; baz\n</code></pre>\n",
+    "example": 231,
+    "start_line": 3749,
+    "end_line": 3758,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "> # Foo\n> bar\nbaz\n",
+    "html": "<blockquote>\n<h1>Foo</h1>\n<p>bar\nbaz</p>\n</blockquote>\n",
+    "example": 232,
+    "start_line": 3764,
+    "end_line": 3774,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "> bar\nbaz\n> foo\n",
+    "html": "<blockquote>\n<p>bar\nbaz\nfoo</p>\n</blockquote>\n",
+    "example": 233,
+    "start_line": 3780,
+    "end_line": 3790,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "> foo\n---\n",
+    "html": "<blockquote>\n<p>foo</p>\n</blockquote>\n<hr />\n",
+    "example": 234,
+    "start_line": 3804,
+    "end_line": 3812,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "> - foo\n- bar\n",
+    "html": "<blockquote>\n<ul>\n<li>foo</li>\n</ul>\n</blockquote>\n<ul>\n<li>bar</li>\n</ul>\n",
+    "example": 235,
+    "start_line": 3824,
+    "end_line": 3836,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": ">     foo\n    bar\n",
+    "html": "<blockquote>\n<pre><code>foo\n</code></pre>\n</blockquote>\n<pre><code>bar\n</code></pre>\n",
+    "example": 236,
+    "start_line": 3842,
+    "end_line": 3852,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "> ```\nfoo\n```\n",
+    "html": "<blockquote>\n<pre><code></code></pre>\n</blockquote>\n<p>foo</p>\n<pre><code></code></pre>\n",
+    "example": 237,
+    "start_line": 3855,
+    "end_line": 3865,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "> foo\n    - bar\n",
+    "html": "<blockquote>\n<p>foo\n- bar</p>\n</blockquote>\n",
+    "example": 238,
+    "start_line": 3871,
+    "end_line": 3879,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": ">\n",
+    "html": "<blockquote>\n</blockquote>\n",
+    "example": 239,
+    "start_line": 3895,
+    "end_line": 3900,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": ">\n>  \n> \n",
+    "html": "<blockquote>\n</blockquote>\n",
+    "example": 240,
+    "start_line": 3903,
+    "end_line": 3910,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": ">\n> foo\n>  \n",
+    "html": "<blockquote>\n<p>foo</p>\n</blockquote>\n",
+    "example": 241,
+    "start_line": 3915,
+    "end_line": 3923,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "> foo\n\n> bar\n",
+    "html": "<blockquote>\n<p>foo</p>\n</blockquote>\n<blockquote>\n<p>bar</p>\n</blockquote>\n",
+    "example": 242,
+    "start_line": 3928,
+    "end_line": 3939,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "> foo\n> bar\n",
+    "html": "<blockquote>\n<p>foo\nbar</p>\n</blockquote>\n",
+    "example": 243,
+    "start_line": 3950,
+    "end_line": 3958,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "> foo\n>\n> bar\n",
+    "html": "<blockquote>\n<p>foo</p>\n<p>bar</p>\n</blockquote>\n",
+    "example": 244,
+    "start_line": 3963,
+    "end_line": 3972,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "foo\n> bar\n",
+    "html": "<p>foo</p>\n<blockquote>\n<p>bar</p>\n</blockquote>\n",
+    "example": 245,
+    "start_line": 3977,
+    "end_line": 3985,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "> aaa\n***\n> bbb\n",
+    "html": "<blockquote>\n<p>aaa</p>\n</blockquote>\n<hr />\n<blockquote>\n<p>bbb</p>\n</blockquote>\n",
+    "example": 246,
+    "start_line": 3991,
+    "end_line": 4003,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "> bar\nbaz\n",
+    "html": "<blockquote>\n<p>bar\nbaz</p>\n</blockquote>\n",
+    "example": 247,
+    "start_line": 4009,
+    "end_line": 4017,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "> bar\n\nbaz\n",
+    "html": "<blockquote>\n<p>bar</p>\n</blockquote>\n<p>baz</p>\n",
+    "example": 248,
+    "start_line": 4020,
+    "end_line": 4029,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "> bar\n>\nbaz\n",
+    "html": "<blockquote>\n<p>bar</p>\n</blockquote>\n<p>baz</p>\n",
+    "example": 249,
+    "start_line": 4032,
+    "end_line": 4041,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "> > > foo\nbar\n",
+    "html": "<blockquote>\n<blockquote>\n<blockquote>\n<p>foo\nbar</p>\n</blockquote>\n</blockquote>\n</blockquote>\n",
+    "example": 250,
+    "start_line": 4048,
+    "end_line": 4060,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": ">>> foo\n> bar\n>>baz\n",
+    "html": "<blockquote>\n<blockquote>\n<blockquote>\n<p>foo\nbar\nbaz</p>\n</blockquote>\n</blockquote>\n</blockquote>\n",
+    "example": 251,
+    "start_line": 4063,
+    "end_line": 4077,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": ">     code\n\n>    not code\n",
+    "html": "<blockquote>\n<pre><code>code\n</code></pre>\n</blockquote>\n<blockquote>\n<p>not code</p>\n</blockquote>\n",
+    "example": 252,
+    "start_line": 4085,
+    "end_line": 4097,
+    "section": "Block quotes"
+  },
+  {
+    "markdown": "A paragraph\nwith two lines.\n\n    indented code\n\n> A block quote.\n",
+    "html": "<p>A paragraph\nwith two lines.</p>\n<pre><code>indented code\n</code></pre>\n<blockquote>\n<p>A block quote.</p>\n</blockquote>\n",
+    "example": 253,
+    "start_line": 4139,
+    "end_line": 4154,
+    "section": "List items"
+  },
+  {
+    "markdown": "1.  A paragraph\n    with two lines.\n\n        indented code\n\n    > A block quote.\n",
+    "html": "<ol>\n<li>\n<p>A paragraph\nwith two lines.</p>\n<pre><code>indented code\n</code></pre>\n<blockquote>\n<p>A block quote.</p>\n</blockquote>\n</li>\n</ol>\n",
+    "example": 254,
+    "start_line": 4161,
+    "end_line": 4180,
+    "section": "List items"
+  },
+  {
+    "markdown": "- one\n\n two\n",
+    "html": "<ul>\n<li>one</li>\n</ul>\n<p>two</p>\n",
+    "example": 255,
+    "start_line": 4194,
+    "end_line": 4203,
+    "section": "List items"
+  },
+  {
+    "markdown": "- one\n\n  two\n",
+    "html": "<ul>\n<li>\n<p>one</p>\n<p>two</p>\n</li>\n</ul>\n",
+    "example": 256,
+    "start_line": 4206,
+    "end_line": 4217,
+    "section": "List items"
+  },
+  {
+    "markdown": " -    one\n\n     two\n",
+    "html": "<ul>\n<li>one</li>\n</ul>\n<pre><code> two\n</code></pre>\n",
+    "example": 257,
+    "start_line": 4220,
+    "end_line": 4230,
+    "section": "List items"
+  },
+  {
+    "markdown": " -    one\n\n      two\n",
+    "html": "<ul>\n<li>\n<p>one</p>\n<p>two</p>\n</li>\n</ul>\n",
+    "example": 258,
+    "start_line": 4233,
+    "end_line": 4244,
+    "section": "List items"
+  },
+  {
+    "markdown": "   > > 1.  one\n>>\n>>     two\n",
+    "html": "<blockquote>\n<blockquote>\n<ol>\n<li>\n<p>one</p>\n<p>two</p>\n</li>\n</ol>\n</blockquote>\n</blockquote>\n",
+    "example": 259,
+    "start_line": 4255,
+    "end_line": 4270,
+    "section": "List items"
+  },
+  {
+    "markdown": ">>- one\n>>\n  >  > two\n",
+    "html": "<blockquote>\n<blockquote>\n<ul>\n<li>one</li>\n</ul>\n<p>two</p>\n</blockquote>\n</blockquote>\n",
+    "example": 260,
+    "start_line": 4282,
+    "end_line": 4295,
+    "section": "List items"
+  },
+  {
+    "markdown": "-one\n\n2.two\n",
+    "html": "<p>-one</p>\n<p>2.two</p>\n",
+    "example": 261,
+    "start_line": 4301,
+    "end_line": 4308,
+    "section": "List items"
+  },
+  {
+    "markdown": "- foo\n\n\n  bar\n",
+    "html": "<ul>\n<li>\n<p>foo</p>\n<p>bar</p>\n</li>\n</ul>\n",
+    "example": 262,
+    "start_line": 4314,
+    "end_line": 4326,
+    "section": "List items"
+  },
+  {
+    "markdown": "1.  foo\n\n    ```\n    bar\n    ```\n\n    baz\n\n    > bam\n",
+    "html": "<ol>\n<li>\n<p>foo</p>\n<pre><code>bar\n</code></pre>\n<p>baz</p>\n<blockquote>\n<p>bam</p>\n</blockquote>\n</li>\n</ol>\n",
+    "example": 263,
+    "start_line": 4331,
+    "end_line": 4353,
+    "section": "List items"
+  },
+  {
+    "markdown": "- Foo\n\n      bar\n\n\n      baz\n",
+    "html": "<ul>\n<li>\n<p>Foo</p>\n<pre><code>bar\n\n\nbaz\n</code></pre>\n</li>\n</ul>\n",
+    "example": 264,
+    "start_line": 4359,
+    "end_line": 4377,
+    "section": "List items"
+  },
+  {
+    "markdown": "123456789. ok\n",
+    "html": "<ol start=\"123456789\">\n<li>ok</li>\n</ol>\n",
+    "example": 265,
+    "start_line": 4381,
+    "end_line": 4387,
+    "section": "List items"
+  },
+  {
+    "markdown": "1234567890. not ok\n",
+    "html": "<p>1234567890. not ok</p>\n",
+    "example": 266,
+    "start_line": 4390,
+    "end_line": 4394,
+    "section": "List items"
+  },
+  {
+    "markdown": "0. ok\n",
+    "html": "<ol start=\"0\">\n<li>ok</li>\n</ol>\n",
+    "example": 267,
+    "start_line": 4399,
+    "end_line": 4405,
+    "section": "List items"
+  },
+  {
+    "markdown": "003. ok\n",
+    "html": "<ol start=\"3\">\n<li>ok</li>\n</ol>\n",
+    "example": 268,
+    "start_line": 4408,
+    "end_line": 4414,
+    "section": "List items"
+  },
+  {
+    "markdown": "-1. not ok\n",
+    "html": "<p>-1. not ok</p>\n",
+    "example": 269,
+    "start_line": 4419,
+    "end_line": 4423,
+    "section": "List items"
+  },
+  {
+    "markdown": "- foo\n\n      bar\n",
+    "html": "<ul>\n<li>\n<p>foo</p>\n<pre><code>bar\n</code></pre>\n</li>\n</ul>\n",
+    "example": 270,
+    "start_line": 4442,
+    "end_line": 4454,
+    "section": "List items"
+  },
+  {
+    "markdown": "  10.  foo\n\n           bar\n",
+    "html": "<ol start=\"10\">\n<li>\n<p>foo</p>\n<pre><code>bar\n</code></pre>\n</li>\n</ol>\n",
+    "example": 271,
+    "start_line": 4459,
+    "end_line": 4471,
+    "section": "List items"
+  },
+  {
+    "markdown": "    indented code\n\nparagraph\n\n    more code\n",
+    "html": "<pre><code>indented code\n</code></pre>\n<p>paragraph</p>\n<pre><code>more code\n</code></pre>\n",
+    "example": 272,
+    "start_line": 4478,
+    "end_line": 4490,
+    "section": "List items"
+  },
+  {
+    "markdown": "1.     indented code\n\n   paragraph\n\n       more code\n",
+    "html": "<ol>\n<li>\n<pre><code>indented code\n</code></pre>\n<p>paragraph</p>\n<pre><code>more code\n</code></pre>\n</li>\n</ol>\n",
+    "example": 273,
+    "start_line": 4493,
+    "end_line": 4509,
+    "section": "List items"
+  },
+  {
+    "markdown": "1.      indented code\n\n   paragraph\n\n       more code\n",
+    "html": "<ol>\n<li>\n<pre><code> indented code\n</code></pre>\n<p>paragraph</p>\n<pre><code>more code\n</code></pre>\n</li>\n</ol>\n",
+    "example": 274,
+    "start_line": 4515,
+    "end_line": 4531,
+    "section": "List items"
+  },
+  {
+    "markdown": "   foo\n\nbar\n",
+    "html": "<p>foo</p>\n<p>bar</p>\n",
+    "example": 275,
+    "start_line": 4542,
+    "end_line": 4549,
+    "section": "List items"
+  },
+  {
+    "markdown": "-    foo\n\n  bar\n",
+    "html": "<ul>\n<li>foo</li>\n</ul>\n<p>bar</p>\n",
+    "example": 276,
+    "start_line": 4552,
+    "end_line": 4561,
+    "section": "List items"
+  },
+  {
+    "markdown": "-  foo\n\n   bar\n",
+    "html": "<ul>\n<li>\n<p>foo</p>\n<p>bar</p>\n</li>\n</ul>\n",
+    "example": 277,
+    "start_line": 4569,
+    "end_line": 4580,
+    "section": "List items"
+  },
+  {
+    "markdown": "-\n  foo\n-\n  ```\n  bar\n  ```\n-\n      baz\n",
+    "html": "<ul>\n<li>foo</li>\n<li>\n<pre><code>bar\n</code></pre>\n</li>\n<li>\n<pre><code>baz\n</code></pre>\n</li>\n</ul>\n",
+    "example": 278,
+    "start_line": 4596,
+    "end_line": 4617,
+    "section": "List items"
+  },
+  {
+    "markdown": "-   \n  foo\n",
+    "html": "<ul>\n<li>foo</li>\n</ul>\n",
+    "example": 279,
+    "start_line": 4622,
+    "end_line": 4629,
+    "section": "List items"
+  },
+  {
+    "markdown": "-\n\n  foo\n",
+    "html": "<ul>\n<li></li>\n</ul>\n<p>foo</p>\n",
+    "example": 280,
+    "start_line": 4636,
+    "end_line": 4645,
+    "section": "List items"
+  },
+  {
+    "markdown": "- foo\n-\n- bar\n",
+    "html": "<ul>\n<li>foo</li>\n<li></li>\n<li>bar</li>\n</ul>\n",
+    "example": 281,
+    "start_line": 4650,
+    "end_line": 4660,
+    "section": "List items"
+  },
+  {
+    "markdown": "- foo\n-   \n- bar\n",
+    "html": "<ul>\n<li>foo</li>\n<li></li>\n<li>bar</li>\n</ul>\n",
+    "example": 282,
+    "start_line": 4665,
+    "end_line": 4675,
+    "section": "List items"
+  },
+  {
+    "markdown": "1. foo\n2.\n3. bar\n",
+    "html": "<ol>\n<li>foo</li>\n<li></li>\n<li>bar</li>\n</ol>\n",
+    "example": 283,
+    "start_line": 4680,
+    "end_line": 4690,
+    "section": "List items"
+  },
+  {
+    "markdown": "*\n",
+    "html": "<ul>\n<li></li>\n</ul>\n",
+    "example": 284,
+    "start_line": 4695,
+    "end_line": 4701,
+    "section": "List items"
+  },
+  {
+    "markdown": "foo\n*\n\nfoo\n1.\n",
+    "html": "<p>foo\n*</p>\n<p>foo\n1.</p>\n",
+    "example": 285,
+    "start_line": 4705,
+    "end_line": 4716,
+    "section": "List items"
+  },
+  {
+    "markdown": " 1.  A paragraph\n     with two lines.\n\n         indented code\n\n     > A block quote.\n",
+    "html": "<ol>\n<li>\n<p>A paragraph\nwith two lines.</p>\n<pre><code>indented code\n</code></pre>\n<blockquote>\n<p>A block quote.</p>\n</blockquote>\n</li>\n</ol>\n",
+    "example": 286,
+    "start_line": 4727,
+    "end_line": 4746,
+    "section": "List items"
+  },
+  {
+    "markdown": "  1.  A paragraph\n      with two lines.\n\n          indented code\n\n      > A block quote.\n",
+    "html": "<ol>\n<li>\n<p>A paragraph\nwith two lines.</p>\n<pre><code>indented code\n</code></pre>\n<blockquote>\n<p>A block quote.</p>\n</blockquote>\n</li>\n</ol>\n",
+    "example": 287,
+    "start_line": 4751,
+    "end_line": 4770,
+    "section": "List items"
+  },
+  {
+    "markdown": "   1.  A paragraph\n       with two lines.\n\n           indented code\n\n       > A block quote.\n",
+    "html": "<ol>\n<li>\n<p>A paragraph\nwith two lines.</p>\n<pre><code>indented code\n</code></pre>\n<blockquote>\n<p>A block quote.</p>\n</blockquote>\n</li>\n</ol>\n",
+    "example": 288,
+    "start_line": 4775,
+    "end_line": 4794,
+    "section": "List items"
+  },
+  {
+    "markdown": "    1.  A paragraph\n        with two lines.\n\n            indented code\n\n        > A block quote.\n",
+    "html": "<pre><code>1.  A paragraph\n    with two lines.\n\n        indented code\n\n    &gt; A block quote.\n</code></pre>\n",
+    "example": 289,
+    "start_line": 4799,
+    "end_line": 4814,
+    "section": "List items"
+  },
+  {
+    "markdown": "  1.  A paragraph\nwith two lines.\n\n          indented code\n\n      > A block quote.\n",
+    "html": "<ol>\n<li>\n<p>A paragraph\nwith two lines.</p>\n<pre><code>indented code\n</code></pre>\n<blockquote>\n<p>A block quote.</p>\n</blockquote>\n</li>\n</ol>\n",
+    "example": 290,
+    "start_line": 4829,
+    "end_line": 4848,
+    "section": "List items"
+  },
+  {
+    "markdown": "  1.  A paragraph\n    with two lines.\n",
+    "html": "<ol>\n<li>A paragraph\nwith two lines.</li>\n</ol>\n",
+    "example": 291,
+    "start_line": 4853,
+    "end_line": 4861,
+    "section": "List items"
+  },
+  {
+    "markdown": "> 1. > Blockquote\ncontinued here.\n",
+    "html": "<blockquote>\n<ol>\n<li>\n<blockquote>\n<p>Blockquote\ncontinued here.</p>\n</blockquote>\n</li>\n</ol>\n</blockquote>\n",
+    "example": 292,
+    "start_line": 4866,
+    "end_line": 4880,
+    "section": "List items"
+  },
+  {
+    "markdown": "> 1. > Blockquote\n> continued here.\n",
+    "html": "<blockquote>\n<ol>\n<li>\n<blockquote>\n<p>Blockquote\ncontinued here.</p>\n</blockquote>\n</li>\n</ol>\n</blockquote>\n",
+    "example": 293,
+    "start_line": 4883,
+    "end_line": 4897,
+    "section": "List items"
+  },
+  {
+    "markdown": "- foo\n  - bar\n    - baz\n      - boo\n",
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+    "example": 366,
+    "start_line": 6462,
+    "end_line": 6468,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*(*foo)\n",
+    "html": "<p>*(*foo)</p>\n",
+    "example": 367,
+    "start_line": 6475,
+    "end_line": 6479,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*(*foo*)*\n",
+    "html": "<p><em>(<em>foo</em>)</em></p>\n",
+    "example": 368,
+    "start_line": 6485,
+    "end_line": 6489,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*foo*bar\n",
+    "html": "<p><em>foo</em>bar</p>\n",
+    "example": 369,
+    "start_line": 6494,
+    "end_line": 6498,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "_foo bar _\n",
+    "html": "<p>_foo bar _</p>\n",
+    "example": 370,
+    "start_line": 6507,
+    "end_line": 6511,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "_(_foo)\n",
+    "html": "<p>_(_foo)</p>\n",
+    "example": 371,
+    "start_line": 6517,
+    "end_line": 6521,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "_(_foo_)_\n",
+    "html": "<p><em>(<em>foo</em>)</em></p>\n",
+    "example": 372,
+    "start_line": 6526,
+    "end_line": 6530,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "_foo_bar\n",
+    "html": "<p>_foo_bar</p>\n",
+    "example": 373,
+    "start_line": 6535,
+    "end_line": 6539,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "_пристаням_стремятся\n",
+    "html": "<p>_пристаням_стремятся</p>\n",
+    "example": 374,
+    "start_line": 6542,
+    "end_line": 6546,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "_foo_bar_baz_\n",
+    "html": "<p><em>foo_bar_baz</em></p>\n",
+    "example": 375,
+    "start_line": 6549,
+    "end_line": 6553,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "_(bar)_.\n",
+    "html": "<p><em>(bar)</em>.</p>\n",
+    "example": 376,
+    "start_line": 6560,
+    "end_line": 6564,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**foo bar**\n",
+    "html": "<p><strong>foo bar</strong></p>\n",
+    "example": 377,
+    "start_line": 6569,
+    "end_line": 6573,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "** foo bar**\n",
+    "html": "<p>** foo bar**</p>\n",
+    "example": 378,
+    "start_line": 6579,
+    "end_line": 6583,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "a**\"foo\"**\n",
+    "html": "<p>a**&quot;foo&quot;**</p>\n",
+    "example": 379,
+    "start_line": 6590,
+    "end_line": 6594,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "foo**bar**\n",
+    "html": "<p>foo<strong>bar</strong></p>\n",
+    "example": 380,
+    "start_line": 6599,
+    "end_line": 6603,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "__foo bar__\n",
+    "html": "<p><strong>foo bar</strong></p>\n",
+    "example": 381,
+    "start_line": 6608,
+    "end_line": 6612,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "__ foo bar__\n",
+    "html": "<p>__ foo bar__</p>\n",
+    "example": 382,
+    "start_line": 6618,
+    "end_line": 6622,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "__\nfoo bar__\n",
+    "html": "<p>__\nfoo bar__</p>\n",
+    "example": 383,
+    "start_line": 6626,
+    "end_line": 6632,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "a__\"foo\"__\n",
+    "html": "<p>a__&quot;foo&quot;__</p>\n",
+    "example": 384,
+    "start_line": 6638,
+    "end_line": 6642,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "foo__bar__\n",
+    "html": "<p>foo__bar__</p>\n",
+    "example": 385,
+    "start_line": 6647,
+    "end_line": 6651,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "5__6__78\n",
+    "html": "<p>5__6__78</p>\n",
+    "example": 386,
+    "start_line": 6654,
+    "end_line": 6658,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "пристаням__стремятся__\n",
+    "html": "<p>пристаням__стремятся__</p>\n",
+    "example": 387,
+    "start_line": 6661,
+    "end_line": 6665,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "__foo, __bar__, baz__\n",
+    "html": "<p><strong>foo, <strong>bar</strong>, baz</strong></p>\n",
+    "example": 388,
+    "start_line": 6668,
+    "end_line": 6672,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "foo-__(bar)__\n",
+    "html": "<p>foo-<strong>(bar)</strong></p>\n",
+    "example": 389,
+    "start_line": 6679,
+    "end_line": 6683,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**foo bar **\n",
+    "html": "<p>**foo bar **</p>\n",
+    "example": 390,
+    "start_line": 6692,
+    "end_line": 6696,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**(**foo)\n",
+    "html": "<p>**(**foo)</p>\n",
+    "example": 391,
+    "start_line": 6705,
+    "end_line": 6709,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*(**foo**)*\n",
+    "html": "<p><em>(<strong>foo</strong>)</em></p>\n",
+    "example": 392,
+    "start_line": 6715,
+    "end_line": 6719,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**Gomphocarpus (*Gomphocarpus physocarpus*, syn.\n*Asclepias physocarpa*)**\n",
+    "html": "<p><strong>Gomphocarpus (<em>Gomphocarpus physocarpus</em>, syn.\n<em>Asclepias physocarpa</em>)</strong></p>\n",
+    "example": 393,
+    "start_line": 6722,
+    "end_line": 6728,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**foo \"*bar*\" foo**\n",
+    "html": "<p><strong>foo &quot;<em>bar</em>&quot; foo</strong></p>\n",
+    "example": 394,
+    "start_line": 6731,
+    "end_line": 6735,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**foo**bar\n",
+    "html": "<p><strong>foo</strong>bar</p>\n",
+    "example": 395,
+    "start_line": 6740,
+    "end_line": 6744,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "__foo bar __\n",
+    "html": "<p>__foo bar __</p>\n",
+    "example": 396,
+    "start_line": 6752,
+    "end_line": 6756,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "__(__foo)\n",
+    "html": "<p>__(__foo)</p>\n",
+    "example": 397,
+    "start_line": 6762,
+    "end_line": 6766,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "_(__foo__)_\n",
+    "html": "<p><em>(<strong>foo</strong>)</em></p>\n",
+    "example": 398,
+    "start_line": 6772,
+    "end_line": 6776,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "__foo__bar\n",
+    "html": "<p>__foo__bar</p>\n",
+    "example": 399,
+    "start_line": 6781,
+    "end_line": 6785,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "__пристаням__стремятся\n",
+    "html": "<p>__пристаням__стремятся</p>\n",
+    "example": 400,
+    "start_line": 6788,
+    "end_line": 6792,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "__foo__bar__baz__\n",
+    "html": "<p><strong>foo__bar__baz</strong></p>\n",
+    "example": 401,
+    "start_line": 6795,
+    "end_line": 6799,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "__(bar)__.\n",
+    "html": "<p><strong>(bar)</strong>.</p>\n",
+    "example": 402,
+    "start_line": 6806,
+    "end_line": 6810,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*foo [bar](/url)*\n",
+    "html": "<p><em>foo <a href=\"/url\">bar</a></em></p>\n",
+    "example": 403,
+    "start_line": 6818,
+    "end_line": 6822,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*foo\nbar*\n",
+    "html": "<p><em>foo\nbar</em></p>\n",
+    "example": 404,
+    "start_line": 6825,
+    "end_line": 6831,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "_foo __bar__ baz_\n",
+    "html": "<p><em>foo <strong>bar</strong> baz</em></p>\n",
+    "example": 405,
+    "start_line": 6837,
+    "end_line": 6841,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "_foo _bar_ baz_\n",
+    "html": "<p><em>foo <em>bar</em> baz</em></p>\n",
+    "example": 406,
+    "start_line": 6844,
+    "end_line": 6848,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "__foo_ bar_\n",
+    "html": "<p><em><em>foo</em> bar</em></p>\n",
+    "example": 407,
+    "start_line": 6851,
+    "end_line": 6855,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*foo *bar**\n",
+    "html": "<p><em>foo <em>bar</em></em></p>\n",
+    "example": 408,
+    "start_line": 6858,
+    "end_line": 6862,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*foo **bar** baz*\n",
+    "html": "<p><em>foo <strong>bar</strong> baz</em></p>\n",
+    "example": 409,
+    "start_line": 6865,
+    "end_line": 6869,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*foo**bar**baz*\n",
+    "html": "<p><em>foo<strong>bar</strong>baz</em></p>\n",
+    "example": 410,
+    "start_line": 6871,
+    "end_line": 6875,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*foo**bar*\n",
+    "html": "<p><em>foo**bar</em></p>\n",
+    "example": 411,
+    "start_line": 6895,
+    "end_line": 6899,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "***foo** bar*\n",
+    "html": "<p><em><strong>foo</strong> bar</em></p>\n",
+    "example": 412,
+    "start_line": 6908,
+    "end_line": 6912,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*foo **bar***\n",
+    "html": "<p><em>foo <strong>bar</strong></em></p>\n",
+    "example": 413,
+    "start_line": 6915,
+    "end_line": 6919,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*foo**bar***\n",
+    "html": "<p><em>foo<strong>bar</strong></em></p>\n",
+    "example": 414,
+    "start_line": 6922,
+    "end_line": 6926,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "foo***bar***baz\n",
+    "html": "<p>foo<em><strong>bar</strong></em>baz</p>\n",
+    "example": 415,
+    "start_line": 6933,
+    "end_line": 6937,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "foo******bar*********baz\n",
+    "html": "<p>foo<strong><strong><strong>bar</strong></strong></strong>***baz</p>\n",
+    "example": 416,
+    "start_line": 6939,
+    "end_line": 6943,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*foo **bar *baz* bim** bop*\n",
+    "html": "<p><em>foo <strong>bar <em>baz</em> bim</strong> bop</em></p>\n",
+    "example": 417,
+    "start_line": 6948,
+    "end_line": 6952,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*foo [*bar*](/url)*\n",
+    "html": "<p><em>foo <a href=\"/url\"><em>bar</em></a></em></p>\n",
+    "example": 418,
+    "start_line": 6955,
+    "end_line": 6959,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "** is not an empty emphasis\n",
+    "html": "<p>** is not an empty emphasis</p>\n",
+    "example": 419,
+    "start_line": 6964,
+    "end_line": 6968,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**** is not an empty strong emphasis\n",
+    "html": "<p>**** is not an empty strong emphasis</p>\n",
+    "example": 420,
+    "start_line": 6971,
+    "end_line": 6975,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**foo [bar](/url)**\n",
+    "html": "<p><strong>foo <a href=\"/url\">bar</a></strong></p>\n",
+    "example": 421,
+    "start_line": 6984,
+    "end_line": 6988,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**foo\nbar**\n",
+    "html": "<p><strong>foo\nbar</strong></p>\n",
+    "example": 422,
+    "start_line": 6991,
+    "end_line": 6997,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "__foo _bar_ baz__\n",
+    "html": "<p><strong>foo <em>bar</em> baz</strong></p>\n",
+    "example": 423,
+    "start_line": 7003,
+    "end_line": 7007,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "__foo __bar__ baz__\n",
+    "html": "<p><strong>foo <strong>bar</strong> baz</strong></p>\n",
+    "example": 424,
+    "start_line": 7010,
+    "end_line": 7014,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "____foo__ bar__\n",
+    "html": "<p><strong><strong>foo</strong> bar</strong></p>\n",
+    "example": 425,
+    "start_line": 7017,
+    "end_line": 7021,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**foo **bar****\n",
+    "html": "<p><strong>foo <strong>bar</strong></strong></p>\n",
+    "example": 426,
+    "start_line": 7024,
+    "end_line": 7028,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**foo *bar* baz**\n",
+    "html": "<p><strong>foo <em>bar</em> baz</strong></p>\n",
+    "example": 427,
+    "start_line": 7031,
+    "end_line": 7035,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**foo*bar*baz**\n",
+    "html": "<p><strong>foo<em>bar</em>baz</strong></p>\n",
+    "example": 428,
+    "start_line": 7038,
+    "end_line": 7042,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "***foo* bar**\n",
+    "html": "<p><strong><em>foo</em> bar</strong></p>\n",
+    "example": 429,
+    "start_line": 7045,
+    "end_line": 7049,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**foo *bar***\n",
+    "html": "<p><strong>foo <em>bar</em></strong></p>\n",
+    "example": 430,
+    "start_line": 7052,
+    "end_line": 7056,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**foo *bar **baz**\nbim* bop**\n",
+    "html": "<p><strong>foo <em>bar <strong>baz</strong>\nbim</em> bop</strong></p>\n",
+    "example": 431,
+    "start_line": 7061,
+    "end_line": 7067,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**foo [*bar*](/url)**\n",
+    "html": "<p><strong>foo <a href=\"/url\"><em>bar</em></a></strong></p>\n",
+    "example": 432,
+    "start_line": 7070,
+    "end_line": 7074,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "__ is not an empty emphasis\n",
+    "html": "<p>__ is not an empty emphasis</p>\n",
+    "example": 433,
+    "start_line": 7079,
+    "end_line": 7083,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "____ is not an empty strong emphasis\n",
+    "html": "<p>____ is not an empty strong emphasis</p>\n",
+    "example": 434,
+    "start_line": 7086,
+    "end_line": 7090,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "foo ***\n",
+    "html": "<p>foo ***</p>\n",
+    "example": 435,
+    "start_line": 7096,
+    "end_line": 7100,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "foo *\\**\n",
+    "html": "<p>foo <em>*</em></p>\n",
+    "example": 436,
+    "start_line": 7103,
+    "end_line": 7107,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "foo *_*\n",
+    "html": "<p>foo <em>_</em></p>\n",
+    "example": 437,
+    "start_line": 7110,
+    "end_line": 7114,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "foo *****\n",
+    "html": "<p>foo *****</p>\n",
+    "example": 438,
+    "start_line": 7117,
+    "end_line": 7121,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "foo **\\***\n",
+    "html": "<p>foo <strong>*</strong></p>\n",
+    "example": 439,
+    "start_line": 7124,
+    "end_line": 7128,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "foo **_**\n",
+    "html": "<p>foo <strong>_</strong></p>\n",
+    "example": 440,
+    "start_line": 7131,
+    "end_line": 7135,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**foo*\n",
+    "html": "<p>*<em>foo</em></p>\n",
+    "example": 441,
+    "start_line": 7142,
+    "end_line": 7146,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*foo**\n",
+    "html": "<p><em>foo</em>*</p>\n",
+    "example": 442,
+    "start_line": 7149,
+    "end_line": 7153,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "***foo**\n",
+    "html": "<p>*<strong>foo</strong></p>\n",
+    "example": 443,
+    "start_line": 7156,
+    "end_line": 7160,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "****foo*\n",
+    "html": "<p>***<em>foo</em></p>\n",
+    "example": 444,
+    "start_line": 7163,
+    "end_line": 7167,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "**foo***\n",
+    "html": "<p><strong>foo</strong>*</p>\n",
+    "example": 445,
+    "start_line": 7170,
+    "end_line": 7174,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "*foo****\n",
+    "html": "<p><em>foo</em>***</p>\n",
+    "example": 446,
+    "start_line": 7177,
+    "end_line": 7181,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "foo ___\n",
+    "html": "<p>foo ___</p>\n",
+    "example": 447,
+    "start_line": 7187,
+    "end_line": 7191,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "foo _\\__\n",
+    "html": "<p>foo <em>_</em></p>\n",
+    "example": 448,
+    "start_line": 7194,
+    "end_line": 7198,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "foo _*_\n",
+    "html": "<p>foo <em>*</em></p>\n",
+    "example": 449,
+    "start_line": 7201,
+    "end_line": 7205,
+    "section": "Emphasis and strong emphasis"
+  },
+  {
+    "markdown": "foo _____\n",
+    "html": "<p>foo _____</p>\n",
+    "example": 450,
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+    "markdown": "[foo]: /url1\n\n[foo]: /url2\n\n[bar][foo]\n",
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+    "markdown": "[bar][foo\\!]\n\n[foo!]: /url\n",
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+    "markdown": "[foo][ref[]\n\n[ref[]: /uri\n",
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+    "markdown": "[foo][ref[bar]]\n\n[ref[bar]]: /uri\n",
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+    "markdown": "[[[foo]]]\n\n[[[foo]]]: /url\n",
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+    "markdown": "[bar\\\\]: /uri\n\n[bar\\\\]\n",
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+  {
+    "markdown": "[\n ]\n\n[\n ]: /uri\n",
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+    "markdown": "[foo][]\n\n[foo]: /url \"title\"\n",
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+  {
+    "markdown": "[*foo* bar][]\n\n[*foo* bar]: /url \"title\"\n",
+    "html": "<p><a href=\"/url\" title=\"title\"><em>foo</em> bar</a></p>\n",
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+    "html": "<p><a href=\"/url\" title=\"title\">Foo</a></p>\n",
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+    "markdown": "[foo] \n[]\n\n[foo]: /url \"title\"\n",
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+  {
+    "markdown": "[foo]\n\n[foo]: /url \"title\"\n",
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+    "section": "Links"
+  },
+  {
+    "markdown": "[*foo* bar]\n\n[*foo* bar]: /url \"title\"\n",
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+    "example": 557,
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+    "section": "Links"
+  },
+  {
+    "markdown": "[[*foo* bar]]\n\n[*foo* bar]: /url \"title\"\n",
+    "html": "<p>[<a href=\"/url\" title=\"title\"><em>foo</em> bar</a>]</p>\n",
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+    "section": "Links"
+  },
+  {
+    "markdown": "[[bar [foo]\n\n[foo]: /url\n",
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+    "section": "Links"
+  },
+  {
+    "markdown": "[Foo]\n\n[foo]: /url \"title\"\n",
+    "html": "<p><a href=\"/url\" title=\"title\">Foo</a></p>\n",
+    "example": 560,
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+    "section": "Links"
+  },
+  {
+    "markdown": "[foo] bar\n\n[foo]: /url\n",
+    "html": "<p><a href=\"/url\">foo</a> bar</p>\n",
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+    "section": "Links"
+  },
+  {
+    "markdown": "\\[foo]\n\n[foo]: /url \"title\"\n",
+    "html": "<p>[foo]</p>\n",
+    "example": 562,
+    "start_line": 8420,
+    "end_line": 8426,
+    "section": "Links"
+  },
+  {
+    "markdown": "[foo*]: /url\n\n*[foo*]\n",
+    "html": "<p>*<a href=\"/url\">foo*</a></p>\n",
+    "example": 563,
+    "start_line": 8432,
+    "end_line": 8438,
+    "section": "Links"
+  },
+  {
+    "markdown": "[foo][bar]\n\n[foo]: /url1\n[bar]: /url2\n",
+    "html": "<p><a href=\"/url2\">foo</a></p>\n",
+    "example": 564,
+    "start_line": 8444,
+    "end_line": 8451,
+    "section": "Links"
+  },
+  {
+    "markdown": "[foo][]\n\n[foo]: /url1\n",
+    "html": "<p><a href=\"/url1\">foo</a></p>\n",
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+    "start_line": 8453,
+    "end_line": 8459,
+    "section": "Links"
+  },
+  {
+    "markdown": "[foo]()\n\n[foo]: /url1\n",
+    "html": "<p><a href=\"\">foo</a></p>\n",
+    "example": 566,
+    "start_line": 8463,
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+    "section": "Links"
+  },
+  {
+    "markdown": "[foo](not a link)\n\n[foo]: /url1\n",
+    "html": "<p><a href=\"/url1\">foo</a>(not a link)</p>\n",
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+    "start_line": 8471,
+    "end_line": 8477,
+    "section": "Links"
+  },
+  {
+    "markdown": "[foo][bar][baz]\n\n[baz]: /url\n",
+    "html": "<p>[foo]<a href=\"/url\">bar</a></p>\n",
+    "example": 568,
+    "start_line": 8482,
+    "end_line": 8488,
+    "section": "Links"
+  },
+  {
+    "markdown": "[foo][bar][baz]\n\n[baz]: /url1\n[bar]: /url2\n",
+    "html": "<p><a href=\"/url2\">foo</a><a href=\"/url1\">baz</a></p>\n",
+    "example": 569,
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+    "end_line": 8501,
+    "section": "Links"
+  },
+  {
+    "markdown": "[foo][bar][baz]\n\n[baz]: /url1\n[foo]: /url2\n",
+    "html": "<p>[foo]<a href=\"/url1\">bar</a></p>\n",
+    "example": 570,
+    "start_line": 8507,
+    "end_line": 8514,
+    "section": "Links"
+  },
+  {
+    "markdown": "![foo](/url \"title\")\n",
+    "html": "<p><img src=\"/url\" alt=\"foo\" title=\"title\" /></p>\n",
+    "example": 571,
+    "start_line": 8530,
+    "end_line": 8534,
+    "section": "Images"
+  },
+  {
+    "markdown": "![foo *bar*]\n\n[foo *bar*]: train.jpg \"train & tracks\"\n",
+    "html": "<p><img src=\"train.jpg\" alt=\"foo bar\" title=\"train &amp; tracks\" /></p>\n",
+    "example": 572,
+    "start_line": 8537,
+    "end_line": 8543,
+    "section": "Images"
+  },
+  {
+    "markdown": "![foo ![bar](/url)](/url2)\n",
+    "html": "<p><img src=\"/url2\" alt=\"foo bar\" /></p>\n",
+    "example": 573,
+    "start_line": 8546,
+    "end_line": 8550,
+    "section": "Images"
+  },
+  {
+    "markdown": "![foo [bar](/url)](/url2)\n",
+    "html": "<p><img src=\"/url2\" alt=\"foo bar\" /></p>\n",
+    "example": 574,
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+    "end_line": 8557,
+    "section": "Images"
+  },
+  {
+    "markdown": "![foo *bar*][]\n\n[foo *bar*]: train.jpg \"train & tracks\"\n",
+    "html": "<p><img src=\"train.jpg\" alt=\"foo bar\" title=\"train &amp; tracks\" /></p>\n",
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+    "start_line": 8567,
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+    "section": "Images"
+  },
+  {
+    "markdown": "![foo *bar*][foobar]\n\n[FOOBAR]: train.jpg \"train & tracks\"\n",
+    "html": "<p><img src=\"train.jpg\" alt=\"foo bar\" title=\"train &amp; tracks\" /></p>\n",
+    "example": 576,
+    "start_line": 8576,
+    "end_line": 8582,
+    "section": "Images"
+  },
+  {
+    "markdown": "![foo](train.jpg)\n",
+    "html": "<p><img src=\"train.jpg\" alt=\"foo\" /></p>\n",
+    "example": 577,
+    "start_line": 8585,
+    "end_line": 8589,
+    "section": "Images"
+  },
+  {
+    "markdown": "My ![foo bar](/path/to/train.jpg  \"title\"   )\n",
+    "html": "<p>My <img src=\"/path/to/train.jpg\" alt=\"foo bar\" title=\"title\" /></p>\n",
+    "example": 578,
+    "start_line": 8592,
+    "end_line": 8596,
+    "section": "Images"
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+    "markdown": "![foo](<url>)\n",
+    "html": "<p><img src=\"url\" alt=\"foo\" /></p>\n",
+    "example": 579,
+    "start_line": 8599,
+    "end_line": 8603,
+    "section": "Images"
+  },
+  {
+    "markdown": "![](/url)\n",
+    "html": "<p><img src=\"/url\" alt=\"\" /></p>\n",
+    "example": 580,
+    "start_line": 8606,
+    "end_line": 8610,
+    "section": "Images"
+  },
+  {
+    "markdown": "![foo][bar]\n\n[bar]: /url\n",
+    "html": "<p><img src=\"/url\" alt=\"foo\" /></p>\n",
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+    "start_line": 8615,
+    "end_line": 8621,
+    "section": "Images"
+  },
+  {
+    "markdown": "![foo][bar]\n\n[BAR]: /url\n",
+    "html": "<p><img src=\"/url\" alt=\"foo\" /></p>\n",
+    "example": 582,
+    "start_line": 8624,
+    "end_line": 8630,
+    "section": "Images"
+  },
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+    "markdown": "![foo][]\n\n[foo]: /url \"title\"\n",
+    "html": "<p><img src=\"/url\" alt=\"foo\" title=\"title\" /></p>\n",
+    "example": 583,
+    "start_line": 8635,
+    "end_line": 8641,
+    "section": "Images"
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+    "markdown": "![*foo* bar][]\n\n[*foo* bar]: /url \"title\"\n",
+    "html": "<p><img src=\"/url\" alt=\"foo bar\" title=\"title\" /></p>\n",
+    "example": 584,
+    "start_line": 8644,
+    "end_line": 8650,
+    "section": "Images"
+  },
+  {
+    "markdown": "![Foo][]\n\n[foo]: /url \"title\"\n",
+    "html": "<p><img src=\"/url\" alt=\"Foo\" title=\"title\" /></p>\n",
+    "example": 585,
+    "start_line": 8655,
+    "end_line": 8661,
+    "section": "Images"
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+    "markdown": "![foo] \n[]\n\n[foo]: /url \"title\"\n",
+    "html": "<p><img src=\"/url\" alt=\"foo\" title=\"title\" />\n[]</p>\n",
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+    "start_line": 8667,
+    "end_line": 8675,
+    "section": "Images"
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+  {
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+    "html": "<p><img src=\"/url\" alt=\"foo\" title=\"title\" /></p>\n",
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+    "start_line": 8680,
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+    "section": "Images"
+  },
+  {
+    "markdown": "![*foo* bar]\n\n[*foo* bar]: /url \"title\"\n",
+    "html": "<p><img src=\"/url\" alt=\"foo bar\" title=\"title\" /></p>\n",
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+    "start_line": 8689,
+    "end_line": 8695,
+    "section": "Images"
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+  {
+    "markdown": "![[foo]]\n\n[[foo]]: /url \"title\"\n",
+    "html": "<p>![[foo]]</p>\n<p>[[foo]]: /url &quot;title&quot;</p>\n",
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+    "start_line": 8700,
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+    "section": "Images"
+  },
+  {
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+    "html": "<p><img src=\"/url\" alt=\"Foo\" title=\"title\" /></p>\n",
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+    "section": "Images"
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+    "html": "<p>![foo]</p>\n",
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+    "start_line": 8724,
+    "end_line": 8730,
+    "section": "Images"
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+    "markdown": "\\![foo]\n\n[foo]: /url \"title\"\n",
+    "html": "<p>!<a href=\"/url\" title=\"title\">foo</a></p>\n",
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+    "start_line": 8736,
+    "end_line": 8742,
+    "section": "Images"
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+    "start_line": 8769,
+    "end_line": 8773,
+    "section": "Autolinks"
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+  {
+    "markdown": "<http://foo.bar.baz/test?q=hello&id=22&boolean>\n",
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+    "start_line": 8776,
+    "end_line": 8780,
+    "section": "Autolinks"
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+    "markdown": "<irc://foo.bar:2233/baz>\n",
+    "html": "<p><a href=\"irc://foo.bar:2233/baz\">irc://foo.bar:2233/baz</a></p>\n",
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+    "start_line": 8783,
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+    "markdown": "<MAILTO:FOO@BAR.BAZ>\n",
+    "html": "<p><a href=\"MAILTO:FOO@BAR.BAZ\">MAILTO:FOO@BAR.BAZ</a></p>\n",
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+    "start_line": 8792,
+    "end_line": 8796,
+    "section": "Autolinks"
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+  {
+    "markdown": "<a+b+c:d>\n",
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+    "start_line": 8804,
+    "end_line": 8808,
+    "section": "Autolinks"
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+    "markdown": "<made-up-scheme://foo,bar>\n",
+    "html": "<p><a href=\"made-up-scheme://foo,bar\">made-up-scheme://foo,bar</a></p>\n",
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+    "start_line": 8811,
+    "end_line": 8815,
+    "section": "Autolinks"
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+  {
+    "markdown": "<http://../>\n",
+    "html": "<p><a href=\"http://../\">http://../</a></p>\n",
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+    "start_line": 8818,
+    "end_line": 8822,
+    "section": "Autolinks"
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+    "markdown": "<localhost:5001/foo>\n",
+    "html": "<p><a href=\"localhost:5001/foo\">localhost:5001/foo</a></p>\n",
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+    "section": "Autolinks"
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+    "markdown": "<http://foo.bar/baz bim>\n",
+    "html": "<p>&lt;http://foo.bar/baz bim&gt;</p>\n",
+    "example": 601,
+    "start_line": 8834,
+    "end_line": 8838,
+    "section": "Autolinks"
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+    "markdown": "<http://example.com/\\[\\>\n",
+    "html": "<p><a href=\"http://example.com/%5C%5B%5C\">http://example.com/\\[\\</a></p>\n",
+    "example": 602,
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+    "section": "Autolinks"
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+    "markdown": "<foo@bar.example.com>\n",
+    "html": "<p><a href=\"mailto:foo@bar.example.com\">foo@bar.example.com</a></p>\n",
+    "example": 603,
+    "start_line": 8865,
+    "end_line": 8869,
+    "section": "Autolinks"
+  },
+  {
+    "markdown": "<foo+special@Bar.baz-bar0.com>\n",
+    "html": "<p><a href=\"mailto:foo+special@Bar.baz-bar0.com\">foo+special@Bar.baz-bar0.com</a></p>\n",
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+    "section": "Autolinks"
+  },
+  {
+    "markdown": "<foo\\+@bar.example.com>\n",
+    "html": "<p>&lt;foo+@bar.example.com&gt;</p>\n",
+    "example": 605,
+    "start_line": 8881,
+    "end_line": 8885,
+    "section": "Autolinks"
+  },
+  {
+    "markdown": "<>\n",
+    "html": "<p>&lt;&gt;</p>\n",
+    "example": 606,
+    "start_line": 8890,
+    "end_line": 8894,
+    "section": "Autolinks"
+  },
+  {
+    "markdown": "< http://foo.bar >\n",
+    "html": "<p>&lt; http://foo.bar &gt;</p>\n",
+    "example": 607,
+    "start_line": 8897,
+    "end_line": 8901,
+    "section": "Autolinks"
+  },
+  {
+    "markdown": "<m:abc>\n",
+    "html": "<p>&lt;m:abc&gt;</p>\n",
+    "example": 608,
+    "start_line": 8904,
+    "end_line": 8908,
+    "section": "Autolinks"
+  },
+  {
+    "markdown": "<foo.bar.baz>\n",
+    "html": "<p>&lt;foo.bar.baz&gt;</p>\n",
+    "example": 609,
+    "start_line": 8911,
+    "end_line": 8915,
+    "section": "Autolinks"
+  },
+  {
+    "markdown": "http://example.com\n",
+    "html": "<p>http://example.com</p>\n",
+    "example": 610,
+    "start_line": 8918,
+    "end_line": 8922,
+    "section": "Autolinks"
+  },
+  {
+    "markdown": "foo@bar.example.com\n",
+    "html": "<p>foo@bar.example.com</p>\n",
+    "example": 611,
+    "start_line": 8925,
+    "end_line": 8929,
+    "section": "Autolinks"
+  },
+  {
+    "markdown": "<a><bab><c2c>\n",
+    "html": "<p><a><bab><c2c></p>\n",
+    "example": 612,
+    "start_line": 9006,
+    "end_line": 9010,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "<a/><b2/>\n",
+    "html": "<p><a/><b2/></p>\n",
+    "example": 613,
+    "start_line": 9015,
+    "end_line": 9019,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "<a  /><b2\ndata=\"foo\" >\n",
+    "html": "<p><a  /><b2\ndata=\"foo\" ></p>\n",
+    "example": 614,
+    "start_line": 9024,
+    "end_line": 9030,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "<a foo=\"bar\" bam = 'baz <em>\"</em>'\n_boolean zoop:33=zoop:33 />\n",
+    "html": "<p><a foo=\"bar\" bam = 'baz <em>\"</em>'\n_boolean zoop:33=zoop:33 /></p>\n",
+    "example": 615,
+    "start_line": 9035,
+    "end_line": 9041,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "Foo <responsive-image src=\"foo.jpg\" />\n",
+    "html": "<p>Foo <responsive-image src=\"foo.jpg\" /></p>\n",
+    "example": 616,
+    "start_line": 9046,
+    "end_line": 9050,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "<33> <__>\n",
+    "html": "<p>&lt;33&gt; &lt;__&gt;</p>\n",
+    "example": 617,
+    "start_line": 9055,
+    "end_line": 9059,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "<a h*#ref=\"hi\">\n",
+    "html": "<p>&lt;a h*#ref=&quot;hi&quot;&gt;</p>\n",
+    "example": 618,
+    "start_line": 9064,
+    "end_line": 9068,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "<a href=\"hi'> <a href=hi'>\n",
+    "html": "<p>&lt;a href=&quot;hi'&gt; &lt;a href=hi'&gt;</p>\n",
+    "example": 619,
+    "start_line": 9073,
+    "end_line": 9077,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "< a><\nfoo><bar/ >\n<foo bar=baz\nbim!bop />\n",
+    "html": "<p>&lt; a&gt;&lt;\nfoo&gt;&lt;bar/ &gt;\n&lt;foo bar=baz\nbim!bop /&gt;</p>\n",
+    "example": 620,
+    "start_line": 9082,
+    "end_line": 9092,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "<a href='bar'title=title>\n",
+    "html": "<p>&lt;a href='bar'title=title&gt;</p>\n",
+    "example": 621,
+    "start_line": 9097,
+    "end_line": 9101,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "</a></foo >\n",
+    "html": "<p></a></foo ></p>\n",
+    "example": 622,
+    "start_line": 9106,
+    "end_line": 9110,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "</a href=\"foo\">\n",
+    "html": "<p>&lt;/a href=&quot;foo&quot;&gt;</p>\n",
+    "example": 623,
+    "start_line": 9115,
+    "end_line": 9119,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "foo <!-- this is a\ncomment - with hyphen -->\n",
+    "html": "<p>foo <!-- this is a\ncomment - with hyphen --></p>\n",
+    "example": 624,
+    "start_line": 9124,
+    "end_line": 9130,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "foo <!-- not a comment -- two hyphens -->\n",
+    "html": "<p>foo &lt;!-- not a comment -- two hyphens --&gt;</p>\n",
+    "example": 625,
+    "start_line": 9133,
+    "end_line": 9137,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "foo <!--> foo -->\n\nfoo <!-- foo--->\n",
+    "html": "<p>foo &lt;!--&gt; foo --&gt;</p>\n<p>foo &lt;!-- foo---&gt;</p>\n",
+    "example": 626,
+    "start_line": 9142,
+    "end_line": 9149,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "foo <?php echo $a; ?>\n",
+    "html": "<p>foo <?php echo $a; ?></p>\n",
+    "example": 627,
+    "start_line": 9154,
+    "end_line": 9158,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "foo <!ELEMENT br EMPTY>\n",
+    "html": "<p>foo <!ELEMENT br EMPTY></p>\n",
+    "example": 628,
+    "start_line": 9163,
+    "end_line": 9167,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "foo <![CDATA[>&<]]>\n",
+    "html": "<p>foo <![CDATA[>&<]]></p>\n",
+    "example": 629,
+    "start_line": 9172,
+    "end_line": 9176,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "foo <a href=\"&ouml;\">\n",
+    "html": "<p>foo <a href=\"&ouml;\"></p>\n",
+    "example": 630,
+    "start_line": 9182,
+    "end_line": 9186,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "foo <a href=\"\\*\">\n",
+    "html": "<p>foo <a href=\"\\*\"></p>\n",
+    "example": 631,
+    "start_line": 9191,
+    "end_line": 9195,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "<a href=\"\\\"\">\n",
+    "html": "<p>&lt;a href=&quot;&quot;&quot;&gt;</p>\n",
+    "example": 632,
+    "start_line": 9198,
+    "end_line": 9202,
+    "section": "Raw HTML"
+  },
+  {
+    "markdown": "foo  \nbaz\n",
+    "html": "<p>foo<br />\nbaz</p>\n",
+    "example": 633,
+    "start_line": 9212,
+    "end_line": 9218,
+    "section": "Hard line breaks"
+  },
+  {
+    "markdown": "foo\\\nbaz\n",
+    "html": "<p>foo<br />\nbaz</p>\n",
+    "example": 634,
+    "start_line": 9224,
+    "end_line": 9230,
+    "section": "Hard line breaks"
+  },
+  {
+    "markdown": "foo       \nbaz\n",
+    "html": "<p>foo<br />\nbaz</p>\n",
+    "example": 635,
+    "start_line": 9235,
+    "end_line": 9241,
+    "section": "Hard line breaks"
+  },
+  {
+    "markdown": "foo  \n     bar\n",
+    "html": "<p>foo<br />\nbar</p>\n",
+    "example": 636,
+    "start_line": 9246,
+    "end_line": 9252,
+    "section": "Hard line breaks"
+  },
+  {
+    "markdown": "foo\\\n     bar\n",
+    "html": "<p>foo<br />\nbar</p>\n",
+    "example": 637,
+    "start_line": 9255,
+    "end_line": 9261,
+    "section": "Hard line breaks"
+  },
+  {
+    "markdown": "*foo  \nbar*\n",
+    "html": "<p><em>foo<br />\nbar</em></p>\n",
+    "example": 638,
+    "start_line": 9267,
+    "end_line": 9273,
+    "section": "Hard line breaks"
+  },
+  {
+    "markdown": "*foo\\\nbar*\n",
+    "html": "<p><em>foo<br />\nbar</em></p>\n",
+    "example": 639,
+    "start_line": 9276,
+    "end_line": 9282,
+    "section": "Hard line breaks"
+  },
+  {
+    "markdown": "`code  \nspan`\n",
+    "html": "<p><code>code   span</code></p>\n",
+    "example": 640,
+    "start_line": 9287,
+    "end_line": 9292,
+    "section": "Hard line breaks"
+  },
+  {
+    "markdown": "`code\\\nspan`\n",
+    "html": "<p><code>code\\ span</code></p>\n",
+    "example": 641,
+    "start_line": 9295,
+    "end_line": 9300,
+    "section": "Hard line breaks"
+  },
+  {
+    "markdown": "<a href=\"foo  \nbar\">\n",
+    "html": "<p><a href=\"foo  \nbar\"></p>\n",
+    "example": 642,
+    "start_line": 9305,
+    "end_line": 9311,
+    "section": "Hard line breaks"
+  },
+  {
+    "markdown": "<a href=\"foo\\\nbar\">\n",
+    "html": "<p><a href=\"foo\\\nbar\"></p>\n",
+    "example": 643,
+    "start_line": 9314,
+    "end_line": 9320,
+    "section": "Hard line breaks"
+  },
+  {
+    "markdown": "foo\\\n",
+    "html": "<p>foo\\</p>\n",
+    "example": 644,
+    "start_line": 9327,
+    "end_line": 9331,
+    "section": "Hard line breaks"
+  },
+  {
+    "markdown": "foo  \n",
+    "html": "<p>foo</p>\n",
+    "example": 645,
+    "start_line": 9334,
+    "end_line": 9338,
+    "section": "Hard line breaks"
+  },
+  {
+    "markdown": "### foo\\\n",
+    "html": "<h3>foo\\</h3>\n",
+    "example": 646,
+    "start_line": 9341,
+    "end_line": 9345,
+    "section": "Hard line breaks"
+  },
+  {
+    "markdown": "### foo  \n",
+    "html": "<h3>foo</h3>\n",
+    "example": 647,
+    "start_line": 9348,
+    "end_line": 9352,
+    "section": "Hard line breaks"
+  },
+  {
+    "markdown": "foo\nbaz\n",
+    "html": "<p>foo\nbaz</p>\n",
+    "example": 648,
+    "start_line": 9363,
+    "end_line": 9369,
+    "section": "Soft line breaks"
+  },
+  {
+    "markdown": "foo \n baz\n",
+    "html": "<p>foo\nbaz</p>\n",
+    "example": 649,
+    "start_line": 9375,
+    "end_line": 9381,
+    "section": "Soft line breaks"
+  },
+  {
+    "markdown": "hello $.;'there\n",
+    "html": "<p>hello $.;'there</p>\n",
+    "example": 650,
+    "start_line": 9395,
+    "end_line": 9399,
+    "section": "Textual content"
+  },
+  {
+    "markdown": "Foo χρῆν\n",
+    "html": "<p>Foo χρῆν</p>\n",
+    "example": 651,
+    "start_line": 9402,
+    "end_line": 9406,
+    "section": "Textual content"
+  },
+  {
+    "markdown": "Multiple     spaces\n",
+    "html": "<p>Multiple     spaces</p>\n",
+    "example": 652,
+    "start_line": 9411,
+    "end_line": 9415,
+    "section": "Textual content"
+  }
+]
\ No newline at end of file
diff --git a/tests/test_cmark_spec/spec.md b/tests/test_cmark_spec/spec.md
new file mode 100644
index 0000000..2d79f7b
--- /dev/null
+++ b/tests/test_cmark_spec/spec.md
@@ -0,0 +1,9756 @@
+---
+title: CommonMark Spec
+author: John MacFarlane
+version: 0.30
+date: '2021-06-19'
+license: '[CC-BY-SA 4.0](http://creativecommons.org/licenses/by-sa/4.0/)'
+...
+
+# Introduction
+
+## What is Markdown?
+
+Markdown is a plain text format for writing structured documents,
+based on conventions for indicating formatting in email
+and usenet posts.  It was developed by John Gruber (with
+help from Aaron Swartz) and released in 2004 in the form of a
+[syntax description](http://daringfireball.net/projects/markdown/syntax)
+and a Perl script (`Markdown.pl`) for converting Markdown to
+HTML.  In the next decade, dozens of implementations were
+developed in many languages.  Some extended the original
+Markdown syntax with conventions for footnotes, tables, and
+other document elements.  Some allowed Markdown documents to be
+rendered in formats other than HTML.  Websites like Reddit,
+StackOverflow, and GitHub had millions of people using Markdown.
+And Markdown started to be used beyond the web, to author books,
+articles, slide shows, letters, and lecture notes.
+
+What distinguishes Markdown from many other lightweight markup
+syntaxes, which are often easier to write, is its readability.
+As Gruber writes:
+
+> The overriding design goal for Markdown's formatting syntax is
+> to make it as readable as possible. The idea is that a
+> Markdown-formatted document should be publishable as-is, as
+> plain text, without looking like it's been marked up with tags
+> or formatting instructions.
+> (<http://daringfireball.net/projects/markdown/>)
+
+The point can be illustrated by comparing a sample of
+[AsciiDoc](http://www.methods.co.nz/asciidoc/) with
+an equivalent sample of Markdown.  Here is a sample of
+AsciiDoc from the AsciiDoc manual:
+
+```
+1. List item one.
++
+List item one continued with a second paragraph followed by an
+Indented block.
++
+.................
+$ ls *.sh
+$ mv *.sh ~/tmp
+.................
++
+List item continued with a third paragraph.
+
+2. List item two continued with an open block.
++
+--
+This paragraph is part of the preceding list item.
+
+a. This list is nested and does not require explicit item
+continuation.
++
+This paragraph is part of the preceding list item.
+
+b. List item b.
+
+This paragraph belongs to item two of the outer list.
+--
+```
+
+And here is the equivalent in Markdown:
+```
+1.  List item one.
+
+    List item one continued with a second paragraph followed by an
+    Indented block.
+
+        $ ls *.sh
+        $ mv *.sh ~/tmp
+
+    List item continued with a third paragraph.
+
+2.  List item two continued with an open block.
+
+    This paragraph is part of the preceding list item.
+
+    1. This list is nested and does not require explicit item continuation.
+
+       This paragraph is part of the preceding list item.
+
+    2. List item b.
+
+    This paragraph belongs to item two of the outer list.
+```
+
+The AsciiDoc version is, arguably, easier to write. You don't need
+to worry about indentation.  But the Markdown version is much easier
+to read.  The nesting of list items is apparent to the eye in the
+source, not just in the processed document.
+
+## Why is a spec needed?
+
+John Gruber's [canonical description of Markdown's
+syntax](http://daringfireball.net/projects/markdown/syntax)
+does not specify the syntax unambiguously.  Here are some examples of
+questions it does not answer:
+
+1.  How much indentation is needed for a sublist?  The spec says that
+    continuation paragraphs need to be indented four spaces, but is
+    not fully explicit about sublists.  It is natural to think that
+    they, too, must be indented four spaces, but `Markdown.pl` does
+    not require that.  This is hardly a "corner case," and divergences
+    between implementations on this issue often lead to surprises for
+    users in real documents. (See [this comment by John
+    Gruber](http://article.gmane.org/gmane.text.markdown.general/1997).)
+
+2.  Is a blank line needed before a block quote or heading?
+    Most implementations do not require the blank line.  However,
+    this can lead to unexpected results in hard-wrapped text, and
+    also to ambiguities in parsing (note that some implementations
+    put the heading inside the blockquote, while others do not).
+    (John Gruber has also spoken [in favor of requiring the blank
+    lines](http://article.gmane.org/gmane.text.markdown.general/2146).)
+
+3.  Is a blank line needed before an indented code block?
+    (`Markdown.pl` requires it, but this is not mentioned in the
+    documentation, and some implementations do not require it.)
+
+    ``` markdown
+    paragraph
+        code?
+    ```
+
+4.  What is the exact rule for determining when list items get
+    wrapped in `<p>` tags?  Can a list be partially "loose" and partially
+    "tight"?  What should we do with a list like this?
+
+    ``` markdown
+    1. one
+
+    2. two
+    3. three
+    ```
+
+    Or this?
+
+    ``` markdown
+    1.  one
+        - a
+
+        - b
+    2.  two
+    ```
+
+    (There are some relevant comments by John Gruber
+    [here](http://article.gmane.org/gmane.text.markdown.general/2554).)
+
+5.  Can list markers be indented?  Can ordered list markers be right-aligned?
+
+    ``` markdown
+     8. item 1
+     9. item 2
+    10. item 2a
+    ```
+
+6.  Is this one list with a thematic break in its second item,
+    or two lists separated by a thematic break?
+
+    ``` markdown
+    * a
+    * * * * *
+    * b
+    ```
+
+7.  When list markers change from numbers to bullets, do we have
+    two lists or one?  (The Markdown syntax description suggests two,
+    but the perl scripts and many other implementations produce one.)
+
+    ``` markdown
+    1. fee
+    2. fie
+    -  foe
+    -  fum
+    ```
+
+8.  What are the precedence rules for the markers of inline structure?
+    For example, is the following a valid link, or does the code span
+    take precedence ?
+
+    ``` markdown
+    [a backtick (`)](/url) and [another backtick (`)](/url).
+    ```
+
+9.  What are the precedence rules for markers of emphasis and strong
+    emphasis?  For example, how should the following be parsed?
+
+    ``` markdown
+    *foo *bar* baz*
+    ```
+
+10. What are the precedence rules between block-level and inline-level
+    structure?  For example, how should the following be parsed?
+
+    ``` markdown
+    - `a long code span can contain a hyphen like this
+      - and it can screw things up`
+    ```
+
+11. Can list items include section headings?  (`Markdown.pl` does not
+    allow this, but does allow blockquotes to include headings.)
+
+    ``` markdown
+    - # Heading
+    ```
+
+12. Can list items be empty?
+
+    ``` markdown
+    * a
+    *
+    * b
+    ```
+
+13. Can link references be defined inside block quotes or list items?
+
+    ``` markdown
+    > Blockquote [foo].
+    >
+    > [foo]: /url
+    ```
+
+14. If there are multiple definitions for the same reference, which takes
+    precedence?
+
+    ``` markdown
+    [foo]: /url1
+    [foo]: /url2
+
+    [foo][]
+    ```
+
+In the absence of a spec, early implementers consulted `Markdown.pl`
+to resolve these ambiguities.  But `Markdown.pl` was quite buggy, and
+gave manifestly bad results in many cases, so it was not a
+satisfactory replacement for a spec.
+
+Because there is no unambiguous spec, implementations have diverged
+considerably.  As a result, users are often surprised to find that
+a document that renders one way on one system (say, a GitHub wiki)
+renders differently on another (say, converting to docbook using
+pandoc).  To make matters worse, because nothing in Markdown counts
+as a "syntax error," the divergence often isn't discovered right away.
+
+## About this document
+
+This document attempts to specify Markdown syntax unambiguously.
+It contains many examples with side-by-side Markdown and
+HTML.  These are intended to double as conformance tests.  An
+accompanying script `spec_tests.py` can be used to run the tests
+against any Markdown program:
+
+    python test/spec_tests.py --spec spec.txt --program PROGRAM
+
+Since this document describes how Markdown is to be parsed into
+an abstract syntax tree, it would have made sense to use an abstract
+representation of the syntax tree instead of HTML.  But HTML is capable
+of representing the structural distinctions we need to make, and the
+choice of HTML for the tests makes it possible to run the tests against
+an implementation without writing an abstract syntax tree renderer.
+
+Note that not every feature of the HTML samples is mandated by
+the spec.  For example, the spec says what counts as a link
+destination, but it doesn't mandate that non-ASCII characters in
+the URL be percent-encoded.  To use the automatic tests,
+implementers will need to provide a renderer that conforms to
+the expectations of the spec examples (percent-encoding
+non-ASCII characters in URLs).  But a conforming implementation
+can use a different renderer and may choose not to
+percent-encode non-ASCII characters in URLs.
+
+This document is generated from a text file, `spec.txt`, written
+in Markdown with a small extension for the side-by-side tests.
+The script `tools/makespec.py` can be used to convert `spec.txt` into
+HTML or CommonMark (which can then be converted into other formats).
+
+In the examples, the `→` character is used to represent tabs.
+
+# Preliminaries
+
+## Characters and lines
+
+Any sequence of [characters] is a valid CommonMark
+document.
+
+A [character](@) is a Unicode code point.  Although some
+code points (for example, combining accents) do not correspond to
+characters in an intuitive sense, all code points count as characters
+for purposes of this spec.
+
+This spec does not specify an encoding; it thinks of lines as composed
+of [characters] rather than bytes.  A conforming parser may be limited
+to a certain encoding.
+
+A [line](@) is a sequence of zero or more [characters]
+other than line feed (`U+000A`) or carriage return (`U+000D`),
+followed by a [line ending] or by the end of file.
+
+A [line ending](@) is a line feed (`U+000A`), a carriage return
+(`U+000D`) not followed by a line feed, or a carriage return and a
+following line feed.
+
+A line containing no characters, or a line containing only spaces
+(`U+0020`) or tabs (`U+0009`), is called a [blank line](@).
+
+The following definitions of character classes will be used in this spec:
+
+A [Unicode whitespace character](@) is
+any code point in the Unicode `Zs` general category, or a tab (`U+0009`),
+line feed (`U+000A`), form feed (`U+000C`), or carriage return (`U+000D`).
+
+[Unicode whitespace](@) is a sequence of one or more
+[Unicode whitespace characters].
+
+A [tab](@) is `U+0009`.
+
+A [space](@) is `U+0020`.
+
+An [ASCII control character](@) is a character between `U+0000–1F` (both
+including) or `U+007F`.
+
+An [ASCII punctuation character](@)
+is `!`, `"`, `#`, `$`, `%`, `&`, `'`, `(`, `)`,
+`*`, `+`, `,`, `-`, `.`, `/` (U+0021–2F), 
+`:`, `;`, `<`, `=`, `>`, `?`, `@` (U+003A–0040),
+`[`, `\`, `]`, `^`, `_`, `` ` `` (U+005B–0060), 
+`{`, `|`, `}`, or `~` (U+007B–007E).
+
+A [Unicode punctuation character](@) is an [ASCII
+punctuation character] or anything in
+the general Unicode categories  `Pc`, `Pd`, `Pe`, `Pf`, `Pi`, `Po`, or `Ps`.
+
+## Tabs
+
+Tabs in lines are not expanded to [spaces].  However,
+in contexts where spaces help to define block structure,
+tabs behave as if they were replaced by spaces with a tab stop
+of 4 characters.
+
+Thus, for example, a tab can be used instead of four spaces
+in an indented code block.  (Note, however, that internal
+tabs are passed through as literal tabs, not expanded to
+spaces.)
+
+```````````````````````````````` example
+→foo→baz→→bim
+.
+<pre><code>foo→baz→→bim
+</code></pre>
+````````````````````````````````
+
+```````````````````````````````` example
+  →foo→baz→→bim
+.
+<pre><code>foo→baz→→bim
+</code></pre>
+````````````````````````````````
+
+```````````````````````````````` example
+    a→a
+    ὐ→a
+.
+<pre><code>a→a
+ὐ→a
+</code></pre>
+````````````````````````````````
+
+In the following example, a continuation paragraph of a list
+item is indented with a tab; this has exactly the same effect
+as indentation with four spaces would:
+
+```````````````````````````````` example
+  - foo
+
+→bar
+.
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
+````````````````````````````````
+
+```````````````````````````````` example
+- foo
+
+→→bar
+.
+<ul>
+<li>
+<p>foo</p>
+<pre><code>  bar
+</code></pre>
+</li>
+</ul>
+````````````````````````````````
+
+Normally the `>` that begins a block quote may be followed
+optionally by a space, which is not considered part of the
+content.  In the following case `>` is followed by a tab,
+which is treated as if it were expanded into three spaces.
+Since one of these spaces is considered part of the
+delimiter, `foo` is considered to be indented six spaces
+inside the block quote context, so we get an indented
+code block starting with two spaces.
+
+```````````````````````````````` example
+>→→foo
+.
+<blockquote>
+<pre><code>  foo
+</code></pre>
+</blockquote>
+````````````````````````````````
+
+```````````````````````````````` example
+-→→foo
+.
+<ul>
+<li>
+<pre><code>  foo
+</code></pre>
+</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+    foo
+→bar
+.
+<pre><code>foo
+bar
+</code></pre>
+````````````````````````````````
+
+```````````````````````````````` example
+ - foo
+   - bar
+→ - baz
+.
+<ul>
+<li>foo
+<ul>
+<li>bar
+<ul>
+<li>baz</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+````````````````````````````````
+
+```````````````````````````````` example
+#→Foo
+.
+<h1>Foo</h1>
+````````````````````````````````
+
+```````````````````````````````` example
+*→*→*→
+.
+<hr />
+````````````````````````````````
+
+
+## Insecure characters
+
+For security reasons, the Unicode character `U+0000` must be replaced
+with the REPLACEMENT CHARACTER (`U+FFFD`).
+
+
+## Backslash escapes
+
+Any ASCII punctuation character may be backslash-escaped:
+
+```````````````````````````````` example
+\!\"\#\$\%\&\'\(\)\*\+\,\-\.\/\:\;\<\=\>\?\@\[\\\]\^\_\`\{\|\}\~
+.
+<p>!&quot;#$%&amp;'()*+,-./:;&lt;=&gt;?@[\]^_`{|}~</p>
+````````````````````````````````
+
+
+Backslashes before other characters are treated as literal
+backslashes:
+
+```````````````````````````````` example
+\→\A\a\ \3\φ\«
+.
+<p>\→\A\a\ \3\φ\«</p>
+````````````````````````````````
+
+
+Escaped characters are treated as regular characters and do
+not have their usual Markdown meanings:
+
+```````````````````````````````` example
+\*not emphasized*
+\<br/> not a tag
+\[not a link](/foo)
+\`not code`
+1\. not a list
+\* not a list
+\# not a heading
+\[foo]: /url "not a reference"
+\&ouml; not a character entity
+.
+<p>*not emphasized*
+&lt;br/&gt; not a tag
+[not a link](/foo)
+`not code`
+1. not a list
+* not a list
+# not a heading
+[foo]: /url &quot;not a reference&quot;
+&amp;ouml; not a character entity</p>
+````````````````````````````````
+
+
+If a backslash is itself escaped, the following character is not:
+
+```````````````````````````````` example
+\\*emphasis*
+.
+<p>\<em>emphasis</em></p>
+````````````````````````````````
+
+
+A backslash at the end of the line is a [hard line break]:
+
+```````````````````````````````` example
+foo\
+bar
+.
+<p>foo<br />
+bar</p>
+````````````````````````````````
+
+
+Backslash escapes do not work in code blocks, code spans, autolinks, or
+raw HTML:
+
+```````````````````````````````` example
+`` \[\` ``
+.
+<p><code>\[\`</code></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+    \[\]
+.
+<pre><code>\[\]
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+~~~
+\[\]
+~~~
+.
+<pre><code>\[\]
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<http://example.com?find=\*>
+.
+<p><a href="http://example.com?find=%5C*">http://example.com?find=\*</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<a href="/bar\/)">
+.
+<a href="/bar\/)">
+````````````````````````````````
+
+
+But they work in all other contexts, including URLs and link titles,
+link references, and [info strings] in [fenced code blocks]:
+
+```````````````````````````````` example
+[foo](/bar\* "ti\*tle")
+.
+<p><a href="/bar*" title="ti*tle">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo]
+
+[foo]: /bar\* "ti\*tle"
+.
+<p><a href="/bar*" title="ti*tle">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+``` foo\+bar
+foo
+```
+.
+<pre><code class="language-foo+bar">foo
+</code></pre>
+````````````````````````````````
+
+
+## Entity and numeric character references
+
+Valid HTML entity references and numeric character references
+can be used in place of the corresponding Unicode character,
+with the following exceptions:
+
+- Entity and character references are not recognized in code
+  blocks and code spans.
+
+- Entity and character references cannot stand in place of
+  special characters that define structural elements in
+  CommonMark.  For example, although `&#42;` can be used
+  in place of a literal `*` character, `&#42;` cannot replace
+  `*` in emphasis delimiters, bullet list markers, or thematic
+  breaks.
+
+Conforming CommonMark parsers need not store information about
+whether a particular character was represented in the source
+using a Unicode character or an entity reference.
+
+[Entity references](@) consist of `&` + any of the valid
+HTML5 entity names + `;`. The
+document <https://html.spec.whatwg.org/entities.json>
+is used as an authoritative source for the valid entity
+references and their corresponding code points.
+
+```````````````````````````````` example
+&nbsp; &amp; &copy; &AElig; &Dcaron;
+&frac34; &HilbertSpace; &DifferentialD;
+&ClockwiseContourIntegral; &ngE;
+.
+<p>  &amp; © Æ Ď
+¾ ℋ ⅆ
+∲ ≧̸</p>
+````````````````````````````````
+
+
+[Decimal numeric character
+references](@)
+consist of `&#` + a string of 1--7 arabic digits + `;`. A
+numeric character reference is parsed as the corresponding
+Unicode character. Invalid Unicode code points will be replaced by
+the REPLACEMENT CHARACTER (`U+FFFD`).  For security reasons,
+the code point `U+0000` will also be replaced by `U+FFFD`.
+
+```````````````````````````````` example
+&#35; &#1234; &#992; &#0;
+.
+<p># Ӓ Ϡ �</p>
+````````````````````````````````
+
+
+[Hexadecimal numeric character
+references](@) consist of `&#` +
+either `X` or `x` + a string of 1-6 hexadecimal digits + `;`.
+They too are parsed as the corresponding Unicode character (this
+time specified with a hexadecimal numeral instead of decimal).
+
+```````````````````````````````` example
+&#X22; &#XD06; &#xcab;
+.
+<p>&quot; ആ ಫ</p>
+````````````````````````````````
+
+
+Here are some nonentities:
+
+```````````````````````````````` example
+&nbsp &x; &#; &#x;
+&#87654321;
+&#abcdef0;
+&ThisIsNotDefined; &hi?;
+.
+<p>&amp;nbsp &amp;x; &amp;#; &amp;#x;
+&amp;#87654321;
+&amp;#abcdef0;
+&amp;ThisIsNotDefined; &amp;hi?;</p>
+````````````````````````````````
+
+
+Although HTML5 does accept some entity references
+without a trailing semicolon (such as `&copy`), these are not
+recognized here, because it makes the grammar too ambiguous:
+
+```````````````````````````````` example
+&copy
+.
+<p>&amp;copy</p>
+````````````````````````````````
+
+
+Strings that are not on the list of HTML5 named entities are not
+recognized as entity references either:
+
+```````````````````````````````` example
+&MadeUpEntity;
+.
+<p>&amp;MadeUpEntity;</p>
+````````````````````````````````
+
+
+Entity and numeric character references are recognized in any
+context besides code spans or code blocks, including
+URLs, [link titles], and [fenced code block][] [info strings]:
+
+```````````````````````````````` example
+<a href="&ouml;&ouml;.html">
+.
+<a href="&ouml;&ouml;.html">
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo](/f&ouml;&ouml; "f&ouml;&ouml;")
+.
+<p><a href="/f%C3%B6%C3%B6" title="föö">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo]
+
+[foo]: /f&ouml;&ouml; "f&ouml;&ouml;"
+.
+<p><a href="/f%C3%B6%C3%B6" title="föö">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+``` f&ouml;&ouml;
+foo
+```
+.
+<pre><code class="language-föö">foo
+</code></pre>
+````````````````````````````````
+
+
+Entity and numeric character references are treated as literal
+text in code spans and code blocks:
+
+```````````````````````````````` example
+`f&ouml;&ouml;`
+.
+<p><code>f&amp;ouml;&amp;ouml;</code></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+    f&ouml;f&ouml;
+.
+<pre><code>f&amp;ouml;f&amp;ouml;
+</code></pre>
+````````````````````````````````
+
+
+Entity and numeric character references cannot be used
+in place of symbols indicating structure in CommonMark
+documents.
+
+```````````````````````````````` example
+&#42;foo&#42;
+*foo*
+.
+<p>*foo*
+<em>foo</em></p>
+````````````````````````````````
+
+```````````````````````````````` example
+&#42; foo
+
+* foo
+.
+<p>* foo</p>
+<ul>
+<li>foo</li>
+</ul>
+````````````````````````````````
+
+```````````````````````````````` example
+foo&#10;&#10;bar
+.
+<p>foo
+
+bar</p>
+````````````````````````````````
+
+```````````````````````````````` example
+&#9;foo
+.
+<p>→foo</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[a](url &quot;tit&quot;)
+.
+<p>[a](url &quot;tit&quot;)</p>
+````````````````````````````````
+
+
+
+# Blocks and inlines
+
+We can think of a document as a sequence of
+[blocks](@)---structural elements like paragraphs, block
+quotations, lists, headings, rules, and code blocks.  Some blocks (like
+block quotes and list items) contain other blocks; others (like
+headings and paragraphs) contain [inline](@) content---text,
+links, emphasized text, images, code spans, and so on.
+
+## Precedence
+
+Indicators of block structure always take precedence over indicators
+of inline structure.  So, for example, the following is a list with
+two items, not a list with one item containing a code span:
+
+```````````````````````````````` example
+- `one
+- two`
+.
+<ul>
+<li>`one</li>
+<li>two`</li>
+</ul>
+````````````````````````````````
+
+
+This means that parsing can proceed in two steps:  first, the block
+structure of the document can be discerned; second, text lines inside
+paragraphs, headings, and other block constructs can be parsed for inline
+structure.  The second step requires information about link reference
+definitions that will be available only at the end of the first
+step.  Note that the first step requires processing lines in sequence,
+but the second can be parallelized, since the inline parsing of
+one block element does not affect the inline parsing of any other.
+
+## Container blocks and leaf blocks
+
+We can divide blocks into two types:
+[container blocks](#container-blocks),
+which can contain other blocks, and [leaf blocks](#leaf-blocks),
+which cannot.
+
+# Leaf blocks
+
+This section describes the different kinds of leaf block that make up a
+Markdown document.
+
+## Thematic breaks
+
+A line consisting of optionally up to three spaces of indentation, followed by a
+sequence of three or more matching `-`, `_`, or `*` characters, each followed
+optionally by any number of spaces or tabs, forms a
+[thematic break](@).
+
+```````````````````````````````` example
+***
+---
+___
+.
+<hr />
+<hr />
+<hr />
+````````````````````````````````
+
+
+Wrong characters:
+
+```````````````````````````````` example
++++
+.
+<p>+++</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+===
+.
+<p>===</p>
+````````````````````````````````
+
+
+Not enough characters:
+
+```````````````````````````````` example
+--
+**
+__
+.
+<p>--
+**
+__</p>
+````````````````````````````````
+
+
+Up to three spaces of indentation are allowed:
+
+```````````````````````````````` example
+ ***
+  ***
+   ***
+.
+<hr />
+<hr />
+<hr />
+````````````````````````````````
+
+
+Four spaces of indentation is too many:
+
+```````````````````````````````` example
+    ***
+.
+<pre><code>***
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+Foo
+    ***
+.
+<p>Foo
+***</p>
+````````````````````````````````
+
+
+More than three characters may be used:
+
+```````````````````````````````` example
+_____________________________________
+.
+<hr />
+````````````````````````````````
+
+
+Spaces and tabs are allowed between the characters:
+
+```````````````````````````````` example
+ - - -
+.
+<hr />
+````````````````````````````````
+
+
+```````````````````````````````` example
+ **  * ** * ** * **
+.
+<hr />
+````````````````````````````````
+
+
+```````````````````````````````` example
+-     -      -      -
+.
+<hr />
+````````````````````````````````
+
+
+Spaces and tabs are allowed at the end:
+
+```````````````````````````````` example
+- - - -    
+.
+<hr />
+````````````````````````````````
+
+
+However, no other characters may occur in the line:
+
+```````````````````````````````` example
+_ _ _ _ a
+
+a------
+
+---a---
+.
+<p>_ _ _ _ a</p>
+<p>a------</p>
+<p>---a---</p>
+````````````````````````````````
+
+
+It is required that all of the characters other than spaces or tabs be the same.
+So, this is not a thematic break:
+
+```````````````````````````````` example
+ *-*
+.
+<p><em>-</em></p>
+````````````````````````````````
+
+
+Thematic breaks do not need blank lines before or after:
+
+```````````````````````````````` example
+- foo
+***
+- bar
+.
+<ul>
+<li>foo</li>
+</ul>
+<hr />
+<ul>
+<li>bar</li>
+</ul>
+````````````````````````````````
+
+
+Thematic breaks can interrupt a paragraph:
+
+```````````````````````````````` example
+Foo
+***
+bar
+.
+<p>Foo</p>
+<hr />
+<p>bar</p>
+````````````````````````````````
+
+
+If a line of dashes that meets the above conditions for being a
+thematic break could also be interpreted as the underline of a [setext
+heading], the interpretation as a
+[setext heading] takes precedence. Thus, for example,
+this is a setext heading, not a paragraph followed by a thematic break:
+
+```````````````````````````````` example
+Foo
+---
+bar
+.
+<h2>Foo</h2>
+<p>bar</p>
+````````````````````````````````
+
+
+When both a thematic break and a list item are possible
+interpretations of a line, the thematic break takes precedence:
+
+```````````````````````````````` example
+* Foo
+* * *
+* Bar
+.
+<ul>
+<li>Foo</li>
+</ul>
+<hr />
+<ul>
+<li>Bar</li>
+</ul>
+````````````````````````````````
+
+
+If you want a thematic break in a list item, use a different bullet:
+
+```````````````````````````````` example
+- Foo
+- * * *
+.
+<ul>
+<li>Foo</li>
+<li>
+<hr />
+</li>
+</ul>
+````````````````````````````````
+
+
+## ATX headings
+
+An [ATX heading](@)
+consists of a string of characters, parsed as inline content, between an
+opening sequence of 1--6 unescaped `#` characters and an optional
+closing sequence of any number of unescaped `#` characters.
+The opening sequence of `#` characters must be followed by spaces or tabs, or
+by the end of line. The optional closing sequence of `#`s must be preceded by
+spaces or tabs and may be followed by spaces or tabs only.  The opening
+`#` character may be preceded by up to three spaces of indentation.  The raw
+contents of the heading are stripped of leading and trailing space or tabs
+before being parsed as inline content.  The heading level is equal to the number
+of `#` characters in the opening sequence.
+
+Simple headings:
+
+```````````````````````````````` example
+# foo
+## foo
+### foo
+#### foo
+##### foo
+###### foo
+.
+<h1>foo</h1>
+<h2>foo</h2>
+<h3>foo</h3>
+<h4>foo</h4>
+<h5>foo</h5>
+<h6>foo</h6>
+````````````````````````````````
+
+
+More than six `#` characters is not a heading:
+
+```````````````````````````````` example
+####### foo
+.
+<p>####### foo</p>
+````````````````````````````````
+
+
+At least one space or tab is required between the `#` characters and the
+heading's contents, unless the heading is empty.  Note that many
+implementations currently do not require the space.  However, the
+space was required by the
+[original ATX implementation](http://www.aaronsw.com/2002/atx/atx.py),
+and it helps prevent things like the following from being parsed as
+headings:
+
+```````````````````````````````` example
+#5 bolt
+
+#hashtag
+.
+<p>#5 bolt</p>
+<p>#hashtag</p>
+````````````````````````````````
+
+
+This is not a heading, because the first `#` is escaped:
+
+```````````````````````````````` example
+\## foo
+.
+<p>## foo</p>
+````````````````````````````````
+
+
+Contents are parsed as inlines:
+
+```````````````````````````````` example
+# foo *bar* \*baz\*
+.
+<h1>foo <em>bar</em> *baz*</h1>
+````````````````````````````````
+
+
+Leading and trailing spaces or tabs are ignored in parsing inline content:
+
+```````````````````````````````` example
+#                  foo                     
+.
+<h1>foo</h1>
+````````````````````````````````
+
+
+Up to three spaces of indentation are allowed:
+
+```````````````````````````````` example
+ ### foo
+  ## foo
+   # foo
+.
+<h3>foo</h3>
+<h2>foo</h2>
+<h1>foo</h1>
+````````````````````````````````
+
+
+Four spaces of indentation is too many:
+
+```````````````````````````````` example
+    # foo
+.
+<pre><code># foo
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo
+    # bar
+.
+<p>foo
+# bar</p>
+````````````````````````````````
+
+
+A closing sequence of `#` characters is optional:
+
+```````````````````````````````` example
+## foo ##
+  ###   bar    ###
+.
+<h2>foo</h2>
+<h3>bar</h3>
+````````````````````````````````
+
+
+It need not be the same length as the opening sequence:
+
+```````````````````````````````` example
+# foo ##################################
+##### foo ##
+.
+<h1>foo</h1>
+<h5>foo</h5>
+````````````````````````````````
+
+
+Spaces or tabs are allowed after the closing sequence:
+
+```````````````````````````````` example
+### foo ###     
+.
+<h3>foo</h3>
+````````````````````````````````
+
+
+A sequence of `#` characters with anything but spaces or tabs following it
+is not a closing sequence, but counts as part of the contents of the
+heading:
+
+```````````````````````````````` example
+### foo ### b
+.
+<h3>foo ### b</h3>
+````````````````````````````````
+
+
+The closing sequence must be preceded by a space or tab:
+
+```````````````````````````````` example
+# foo#
+.
+<h1>foo#</h1>
+````````````````````````````````
+
+
+Backslash-escaped `#` characters do not count as part
+of the closing sequence:
+
+```````````````````````````````` example
+### foo \###
+## foo #\##
+# foo \#
+.
+<h3>foo ###</h3>
+<h2>foo ###</h2>
+<h1>foo #</h1>
+````````````````````````````````
+
+
+ATX headings need not be separated from surrounding content by blank
+lines, and they can interrupt paragraphs:
+
+```````````````````````````````` example
+****
+## foo
+****
+.
+<hr />
+<h2>foo</h2>
+<hr />
+````````````````````````````````
+
+
+```````````````````````````````` example
+Foo bar
+# baz
+Bar foo
+.
+<p>Foo bar</p>
+<h1>baz</h1>
+<p>Bar foo</p>
+````````````````````````````````
+
+
+ATX headings can be empty:
+
+```````````````````````````````` example
+## 
+#
+### ###
+.
+<h2></h2>
+<h1></h1>
+<h3></h3>
+````````````````````````````````
+
+
+## Setext headings
+
+A [setext heading](@) consists of one or more
+lines of text, not interrupted by a blank line, of which the first line does not
+have more than 3 spaces of indentation, followed by
+a [setext heading underline].  The lines of text must be such
+that, were they not followed by the setext heading underline,
+they would be interpreted as a paragraph:  they cannot be
+interpretable as a [code fence], [ATX heading][ATX headings],
+[block quote][block quotes], [thematic break][thematic breaks],
+[list item][list items], or [HTML block][HTML blocks].
+
+A [setext heading underline](@) is a sequence of
+`=` characters or a sequence of `-` characters, with no more than 3
+spaces of indentation and any number of trailing spaces or tabs.  If a line
+containing a single `-` can be interpreted as an
+empty [list items], it should be interpreted this way
+and not as a [setext heading underline].
+
+The heading is a level 1 heading if `=` characters are used in
+the [setext heading underline], and a level 2 heading if `-`
+characters are used.  The contents of the heading are the result
+of parsing the preceding lines of text as CommonMark inline
+content.
+
+In general, a setext heading need not be preceded or followed by a
+blank line.  However, it cannot interrupt a paragraph, so when a
+setext heading comes after a paragraph, a blank line is needed between
+them.
+
+Simple examples:
+
+```````````````````````````````` example
+Foo *bar*
+=========
+
+Foo *bar*
+---------
+.
+<h1>Foo <em>bar</em></h1>
+<h2>Foo <em>bar</em></h2>
+````````````````````````````````
+
+
+The content of the header may span more than one line:
+
+```````````````````````````````` example
+Foo *bar
+baz*
+====
+.
+<h1>Foo <em>bar
+baz</em></h1>
+````````````````````````````````
+
+The contents are the result of parsing the headings's raw
+content as inlines.  The heading's raw content is formed by
+concatenating the lines and removing initial and final
+spaces or tabs.
+
+```````````````````````````````` example
+  Foo *bar
+baz*→
+====
+.
+<h1>Foo <em>bar
+baz</em></h1>
+````````````````````````````````
+
+
+The underlining can be any length:
+
+```````````````````````````````` example
+Foo
+-------------------------
+
+Foo
+=
+.
+<h2>Foo</h2>
+<h1>Foo</h1>
+````````````````````````````````
+
+
+The heading content can be preceded by up to three spaces of indentation, and
+need not line up with the underlining:
+
+```````````````````````````````` example
+   Foo
+---
+
+  Foo
+-----
+
+  Foo
+  ===
+.
+<h2>Foo</h2>
+<h2>Foo</h2>
+<h1>Foo</h1>
+````````````````````````````````
+
+
+Four spaces of indentation is too many:
+
+```````````````````````````````` example
+    Foo
+    ---
+
+    Foo
+---
+.
+<pre><code>Foo
+---
+
+Foo
+</code></pre>
+<hr />
+````````````````````````````````
+
+
+The setext heading underline can be preceded by up to three spaces of
+indentation, and may have trailing spaces or tabs:
+
+```````````````````````````````` example
+Foo
+   ----      
+.
+<h2>Foo</h2>
+````````````````````````````````
+
+
+Four spaces of indentation is too many:
+
+```````````````````````````````` example
+Foo
+    ---
+.
+<p>Foo
+---</p>
+````````````````````````````````
+
+
+The setext heading underline cannot contain internal spaces or tabs:
+
+```````````````````````````````` example
+Foo
+= =
+
+Foo
+--- -
+.
+<p>Foo
+= =</p>
+<p>Foo</p>
+<hr />
+````````````````````````````````
+
+
+Trailing spaces or tabs in the content line do not cause a hard line break:
+
+```````````````````````````````` example
+Foo  
+-----
+.
+<h2>Foo</h2>
+````````````````````````````````
+
+
+Nor does a backslash at the end:
+
+```````````````````````````````` example
+Foo\
+----
+.
+<h2>Foo\</h2>
+````````````````````````````````
+
+
+Since indicators of block structure take precedence over
+indicators of inline structure, the following are setext headings:
+
+```````````````````````````````` example
+`Foo
+----
+`
+
+<a title="a lot
+---
+of dashes"/>
+.
+<h2>`Foo</h2>
+<p>`</p>
+<h2>&lt;a title=&quot;a lot</h2>
+<p>of dashes&quot;/&gt;</p>
+````````````````````````````````
+
+
+The setext heading underline cannot be a [lazy continuation
+line] in a list item or block quote:
+
+```````````````````````````````` example
+> Foo
+---
+.
+<blockquote>
+<p>Foo</p>
+</blockquote>
+<hr />
+````````````````````````````````
+
+
+```````````````````````````````` example
+> foo
+bar
+===
+.
+<blockquote>
+<p>foo
+bar
+===</p>
+</blockquote>
+````````````````````````````````
+
+
+```````````````````````````````` example
+- Foo
+---
+.
+<ul>
+<li>Foo</li>
+</ul>
+<hr />
+````````````````````````````````
+
+
+A blank line is needed between a paragraph and a following
+setext heading, since otherwise the paragraph becomes part
+of the heading's content:
+
+```````````````````````````````` example
+Foo
+Bar
+---
+.
+<h2>Foo
+Bar</h2>
+````````````````````````````````
+
+
+But in general a blank line is not required before or after
+setext headings:
+
+```````````````````````````````` example
+---
+Foo
+---
+Bar
+---
+Baz
+.
+<hr />
+<h2>Foo</h2>
+<h2>Bar</h2>
+<p>Baz</p>
+````````````````````````````````
+
+
+Setext headings cannot be empty:
+
+```````````````````````````````` example
+
+====
+.
+<p>====</p>
+````````````````````````````````
+
+
+Setext heading text lines must not be interpretable as block
+constructs other than paragraphs.  So, the line of dashes
+in these examples gets interpreted as a thematic break:
+
+```````````````````````````````` example
+---
+---
+.
+<hr />
+<hr />
+````````````````````````````````
+
+
+```````````````````````````````` example
+- foo
+-----
+.
+<ul>
+<li>foo</li>
+</ul>
+<hr />
+````````````````````````````````
+
+
+```````````````````````````````` example
+    foo
+---
+.
+<pre><code>foo
+</code></pre>
+<hr />
+````````````````````````````````
+
+
+```````````````````````````````` example
+> foo
+-----
+.
+<blockquote>
+<p>foo</p>
+</blockquote>
+<hr />
+````````````````````````````````
+
+
+If you want a heading with `> foo` as its literal text, you can
+use backslash escapes:
+
+```````````````````````````````` example
+\> foo
+------
+.
+<h2>&gt; foo</h2>
+````````````````````````````````
+
+
+**Compatibility note:**  Most existing Markdown implementations
+do not allow the text of setext headings to span multiple lines.
+But there is no consensus about how to interpret
+
+``` markdown
+Foo
+bar
+---
+baz
+```
+
+One can find four different interpretations:
+
+1. paragraph "Foo", heading "bar", paragraph "baz"
+2. paragraph "Foo bar", thematic break, paragraph "baz"
+3. paragraph "Foo bar --- baz"
+4. heading "Foo bar", paragraph "baz"
+
+We find interpretation 4 most natural, and interpretation 4
+increases the expressive power of CommonMark, by allowing
+multiline headings.  Authors who want interpretation 1 can
+put a blank line after the first paragraph:
+
+```````````````````````````````` example
+Foo
+
+bar
+---
+baz
+.
+<p>Foo</p>
+<h2>bar</h2>
+<p>baz</p>
+````````````````````````````````
+
+
+Authors who want interpretation 2 can put blank lines around
+the thematic break,
+
+```````````````````````````````` example
+Foo
+bar
+
+---
+
+baz
+.
+<p>Foo
+bar</p>
+<hr />
+<p>baz</p>
+````````````````````````````````
+
+
+or use a thematic break that cannot count as a [setext heading
+underline], such as
+
+```````````````````````````````` example
+Foo
+bar
+* * *
+baz
+.
+<p>Foo
+bar</p>
+<hr />
+<p>baz</p>
+````````````````````````````````
+
+
+Authors who want interpretation 3 can use backslash escapes:
+
+```````````````````````````````` example
+Foo
+bar
+\---
+baz
+.
+<p>Foo
+bar
+---
+baz</p>
+````````````````````````````````
+
+
+## Indented code blocks
+
+An [indented code block](@) is composed of one or more
+[indented chunks] separated by blank lines.
+An [indented chunk](@) is a sequence of non-blank lines,
+each preceded by four or more spaces of indentation. The contents of the code
+block are the literal contents of the lines, including trailing
+[line endings], minus four spaces of indentation.
+An indented code block has no [info string].
+
+An indented code block cannot interrupt a paragraph, so there must be
+a blank line between a paragraph and a following indented code block.
+(A blank line is not needed, however, between a code block and a following
+paragraph.)
+
+```````````````````````````````` example
+    a simple
+      indented code block
+.
+<pre><code>a simple
+  indented code block
+</code></pre>
+````````````````````````````````
+
+
+If there is any ambiguity between an interpretation of indentation
+as a code block and as indicating that material belongs to a [list
+item][list items], the list item interpretation takes precedence:
+
+```````````````````````````````` example
+  - foo
+
+    bar
+.
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+1.  foo
+
+    - bar
+.
+<ol>
+<li>
+<p>foo</p>
+<ul>
+<li>bar</li>
+</ul>
+</li>
+</ol>
+````````````````````````````````
+
+
+
+The contents of a code block are literal text, and do not get parsed
+as Markdown:
+
+```````````````````````````````` example
+    <a/>
+    *hi*
+
+    - one
+.
+<pre><code>&lt;a/&gt;
+*hi*
+
+- one
+</code></pre>
+````````````````````````````````
+
+
+Here we have three chunks separated by blank lines:
+
+```````````````````````````````` example
+    chunk1
+
+    chunk2
+  
+ 
+ 
+    chunk3
+.
+<pre><code>chunk1
+
+chunk2
+
+
+
+chunk3
+</code></pre>
+````````````````````````````````
+
+
+Any initial spaces or tabs beyond four spaces of indentation will be included in
+the content, even in interior blank lines:
+
+```````````````````````````````` example
+    chunk1
+      
+      chunk2
+.
+<pre><code>chunk1
+  
+  chunk2
+</code></pre>
+````````````````````````````````
+
+
+An indented code block cannot interrupt a paragraph.  (This
+allows hanging indents and the like.)
+
+```````````````````````````````` example
+Foo
+    bar
+
+.
+<p>Foo
+bar</p>
+````````````````````````````````
+
+
+However, any non-blank line with fewer than four spaces of indentation ends
+the code block immediately.  So a paragraph may occur immediately
+after indented code:
+
+```````````````````````````````` example
+    foo
+bar
+.
+<pre><code>foo
+</code></pre>
+<p>bar</p>
+````````````````````````````````
+
+
+And indented code can occur immediately before and after other kinds of
+blocks:
+
+```````````````````````````````` example
+# Heading
+    foo
+Heading
+------
+    foo
+----
+.
+<h1>Heading</h1>
+<pre><code>foo
+</code></pre>
+<h2>Heading</h2>
+<pre><code>foo
+</code></pre>
+<hr />
+````````````````````````````````
+
+
+The first line can be preceded by more than four spaces of indentation:
+
+```````````````````````````````` example
+        foo
+    bar
+.
+<pre><code>    foo
+bar
+</code></pre>
+````````````````````````````````
+
+
+Blank lines preceding or following an indented code block
+are not included in it:
+
+```````````````````````````````` example
+
+    
+    foo
+    
+
+.
+<pre><code>foo
+</code></pre>
+````````````````````````````````
+
+
+Trailing spaces or tabs are included in the code block's content:
+
+```````````````````````````````` example
+    foo  
+.
+<pre><code>foo  
+</code></pre>
+````````````````````````````````
+
+
+
+## Fenced code blocks
+
+A [code fence](@) is a sequence
+of at least three consecutive backtick characters (`` ` ``) or
+tildes (`~`).  (Tildes and backticks cannot be mixed.)
+A [fenced code block](@)
+begins with a code fence, preceded by up to three spaces of indentation.
+
+The line with the opening code fence may optionally contain some text
+following the code fence; this is trimmed of leading and trailing
+spaces or tabs and called the [info string](@). If the [info string] comes
+after a backtick fence, it may not contain any backtick
+characters.  (The reason for this restriction is that otherwise
+some inline code would be incorrectly interpreted as the
+beginning of a fenced code block.)
+
+The content of the code block consists of all subsequent lines, until
+a closing [code fence] of the same type as the code block
+began with (backticks or tildes), and with at least as many backticks
+or tildes as the opening code fence.  If the leading code fence is
+preceded by N spaces of indentation, then up to N spaces of indentation are
+removed from each line of the content (if present).  (If a content line is not
+indented, it is preserved unchanged.  If it is indented N spaces or less, all
+of the indentation is removed.)
+
+The closing code fence may be preceded by up to three spaces of indentation, and
+may be followed only by spaces or tabs, which are ignored.  If the end of the
+containing block (or document) is reached and no closing code fence
+has been found, the code block contains all of the lines after the
+opening code fence until the end of the containing block (or
+document).  (An alternative spec would require backtracking in the
+event that a closing code fence is not found.  But this makes parsing
+much less efficient, and there seems to be no real down side to the
+behavior described here.)
+
+A fenced code block may interrupt a paragraph, and does not require
+a blank line either before or after.
+
+The content of a code fence is treated as literal text, not parsed
+as inlines.  The first word of the [info string] is typically used to
+specify the language of the code sample, and rendered in the `class`
+attribute of the `code` tag.  However, this spec does not mandate any
+particular treatment of the [info string].
+
+Here is a simple example with backticks:
+
+```````````````````````````````` example
+```
+<
+ >
+```
+.
+<pre><code>&lt;
+ &gt;
+</code></pre>
+````````````````````````````````
+
+
+With tildes:
+
+```````````````````````````````` example
+~~~
+<
+ >
+~~~
+.
+<pre><code>&lt;
+ &gt;
+</code></pre>
+````````````````````````````````
+
+Fewer than three backticks is not enough:
+
+```````````````````````````````` example
+``
+foo
+``
+.
+<p><code>foo</code></p>
+````````````````````````````````
+
+The closing code fence must use the same character as the opening
+fence:
+
+```````````````````````````````` example
+```
+aaa
+~~~
+```
+.
+<pre><code>aaa
+~~~
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+~~~
+aaa
+```
+~~~
+.
+<pre><code>aaa
+```
+</code></pre>
+````````````````````````````````
+
+
+The closing code fence must be at least as long as the opening fence:
+
+```````````````````````````````` example
+````
+aaa
+```
+``````
+.
+<pre><code>aaa
+```
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+~~~~
+aaa
+~~~
+~~~~
+.
+<pre><code>aaa
+~~~
+</code></pre>
+````````````````````````````````
+
+
+Unclosed code blocks are closed by the end of the document
+(or the enclosing [block quote][block quotes] or [list item][list items]):
+
+```````````````````````````````` example
+```
+.
+<pre><code></code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+`````
+
+```
+aaa
+.
+<pre><code>
+```
+aaa
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+> ```
+> aaa
+
+bbb
+.
+<blockquote>
+<pre><code>aaa
+</code></pre>
+</blockquote>
+<p>bbb</p>
+````````````````````````````````
+
+
+A code block can have all empty lines as its content:
+
+```````````````````````````````` example
+```
+
+  
+```
+.
+<pre><code>
+  
+</code></pre>
+````````````````````````````````
+
+
+A code block can be empty:
+
+```````````````````````````````` example
+```
+```
+.
+<pre><code></code></pre>
+````````````````````````````````
+
+
+Fences can be indented.  If the opening fence is indented,
+content lines will have equivalent opening indentation removed,
+if present:
+
+```````````````````````````````` example
+ ```
+ aaa
+aaa
+```
+.
+<pre><code>aaa
+aaa
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+  ```
+aaa
+  aaa
+aaa
+  ```
+.
+<pre><code>aaa
+aaa
+aaa
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+   ```
+   aaa
+    aaa
+  aaa
+   ```
+.
+<pre><code>aaa
+ aaa
+aaa
+</code></pre>
+````````````````````````````````
+
+
+Four spaces of indentation is too many:
+
+```````````````````````````````` example
+    ```
+    aaa
+    ```
+.
+<pre><code>```
+aaa
+```
+</code></pre>
+````````````````````````````````
+
+
+Closing fences may be preceded by up to three spaces of indentation, and their
+indentation need not match that of the opening fence:
+
+```````````````````````````````` example
+```
+aaa
+  ```
+.
+<pre><code>aaa
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+   ```
+aaa
+  ```
+.
+<pre><code>aaa
+</code></pre>
+````````````````````````````````
+
+
+This is not a closing fence, because it is indented 4 spaces:
+
+```````````````````````````````` example
+```
+aaa
+    ```
+.
+<pre><code>aaa
+    ```
+</code></pre>
+````````````````````````````````
+
+
+
+Code fences (opening and closing) cannot contain internal spaces or tabs:
+
+```````````````````````````````` example
+``` ```
+aaa
+.
+<p><code> </code>
+aaa</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+~~~~~~
+aaa
+~~~ ~~
+.
+<pre><code>aaa
+~~~ ~~
+</code></pre>
+````````````````````````````````
+
+
+Fenced code blocks can interrupt paragraphs, and can be followed
+directly by paragraphs, without a blank line between:
+
+```````````````````````````````` example
+foo
+```
+bar
+```
+baz
+.
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+<p>baz</p>
+````````````````````````````````
+
+
+Other blocks can also occur before and after fenced code blocks
+without an intervening blank line:
+
+```````````````````````````````` example
+foo
+---
+~~~
+bar
+~~~
+# baz
+.
+<h2>foo</h2>
+<pre><code>bar
+</code></pre>
+<h1>baz</h1>
+````````````````````````````````
+
+
+An [info string] can be provided after the opening code fence.
+Although this spec doesn't mandate any particular treatment of
+the info string, the first word is typically used to specify
+the language of the code block. In HTML output, the language is
+normally indicated by adding a class to the `code` element consisting
+of `language-` followed by the language name.
+
+```````````````````````````````` example
+```ruby
+def foo(x)
+  return 3
+end
+```
+.
+<pre><code class="language-ruby">def foo(x)
+  return 3
+end
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+~~~~    ruby startline=3 $%@#$
+def foo(x)
+  return 3
+end
+~~~~~~~
+.
+<pre><code class="language-ruby">def foo(x)
+  return 3
+end
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+````;
+````
+.
+<pre><code class="language-;"></code></pre>
+````````````````````````````````
+
+
+[Info strings] for backtick code blocks cannot contain backticks:
+
+```````````````````````````````` example
+``` aa ```
+foo
+.
+<p><code>aa</code>
+foo</p>
+````````````````````````````````
+
+
+[Info strings] for tilde code blocks can contain backticks and tildes:
+
+```````````````````````````````` example
+~~~ aa ``` ~~~
+foo
+~~~
+.
+<pre><code class="language-aa">foo
+</code></pre>
+````````````````````````````````
+
+
+Closing code fences cannot have [info strings]:
+
+```````````````````````````````` example
+```
+``` aaa
+```
+.
+<pre><code>``` aaa
+</code></pre>
+````````````````````````````````
+
+
+
+## HTML blocks
+
+An [HTML block](@) is a group of lines that is treated
+as raw HTML (and will not be escaped in HTML output).
+
+There are seven kinds of [HTML block], which can be defined by their
+start and end conditions.  The block begins with a line that meets a
+[start condition](@) (after up to three optional spaces of indentation).
+It ends with the first subsequent line that meets a matching
+[end condition](@), or the last line of the document, or the last line of
+the [container block](#container-blocks) containing the current HTML
+block, if no line is encountered that meets the [end condition].  If
+the first line meets both the [start condition] and the [end
+condition], the block will contain just that line.
+
+1.  **Start condition:**  line begins with the string `<pre`,
+`<script`, `<style`, or `<textarea` (case-insensitive), followed by a space,
+a tab, the string `>`, or the end of the line.\
+**End condition:**  line contains an end tag
+`</pre>`, `</script>`, `</style>`, or `</textarea>` (case-insensitive; it
+need not match the start tag).
+
+2.  **Start condition:** line begins with the string `<!--`.\
+**End condition:**  line contains the string `-->`.
+
+3.  **Start condition:** line begins with the string `<?`.\
+**End condition:** line contains the string `?>`.
+
+4.  **Start condition:** line begins with the string `<!`
+followed by an ASCII letter.\
+**End condition:** line contains the character `>`.
+
+5.  **Start condition:**  line begins with the string
+`<![CDATA[`.\
+**End condition:** line contains the string `]]>`.
+
+6.  **Start condition:** line begins the string `<` or `</`
+followed by one of the strings (case-insensitive) `address`,
+`article`, `aside`, `base`, `basefont`, `blockquote`, `body`,
+`caption`, `center`, `col`, `colgroup`, `dd`, `details`, `dialog`,
+`dir`, `div`, `dl`, `dt`, `fieldset`, `figcaption`, `figure`,
+`footer`, `form`, `frame`, `frameset`,
+`h1`, `h2`, `h3`, `h4`, `h5`, `h6`, `head`, `header`, `hr`,
+`html`, `iframe`, `legend`, `li`, `link`, `main`, `menu`, `menuitem`,
+`nav`, `noframes`, `ol`, `optgroup`, `option`, `p`, `param`,
+`section`, `source`, `summary`, `table`, `tbody`, `td`,
+`tfoot`, `th`, `thead`, `title`, `tr`, `track`, `ul`, followed
+by a space, a tab, the end of the line, the string `>`, or
+the string `/>`.\
+**End condition:** line is followed by a [blank line].
+
+7.  **Start condition:**  line begins with a complete [open tag]
+(with any [tag name] other than `pre`, `script`,
+`style`, or `textarea`) or a complete [closing tag],
+followed by zero or more spaces and tabs, followed by the end of the line.\
+**End condition:** line is followed by a [blank line].
+
+HTML blocks continue until they are closed by their appropriate
+[end condition], or the last line of the document or other [container
+block](#container-blocks).  This means any HTML **within an HTML
+block** that might otherwise be recognised as a start condition will
+be ignored by the parser and passed through as-is, without changing
+the parser's state.
+
+For instance, `<pre>` within an HTML block started by `<table>` will not affect
+the parser state; as the HTML block was started in by start condition 6, it
+will end at any blank line. This can be surprising:
+
+```````````````````````````````` example
+<table><tr><td>
+<pre>
+**Hello**,
+
+_world_.
+</pre>
+</td></tr></table>
+.
+<table><tr><td>
+<pre>
+**Hello**,
+<p><em>world</em>.
+</pre></p>
+</td></tr></table>
+````````````````````````````````
+
+In this case, the HTML block is terminated by the blank line — the `**Hello**`
+text remains verbatim — and regular parsing resumes, with a paragraph,
+emphasised `world` and inline and block HTML following.
+
+All types of [HTML blocks] except type 7 may interrupt
+a paragraph.  Blocks of type 7 may not interrupt a paragraph.
+(This restriction is intended to prevent unwanted interpretation
+of long tags inside a wrapped paragraph as starting HTML blocks.)
+
+Some simple examples follow.  Here are some basic HTML blocks
+of type 6:
+
+```````````````````````````````` example
+<table>
+  <tr>
+    <td>
+           hi
+    </td>
+  </tr>
+</table>
+
+okay.
+.
+<table>
+  <tr>
+    <td>
+           hi
+    </td>
+  </tr>
+</table>
+<p>okay.</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+ <div>
+  *hello*
+         <foo><a>
+.
+ <div>
+  *hello*
+         <foo><a>
+````````````````````````````````
+
+
+A block can also start with a closing tag:
+
+```````````````````````````````` example
+</div>
+*foo*
+.
+</div>
+*foo*
+````````````````````````````````
+
+
+Here we have two HTML blocks with a Markdown paragraph between them:
+
+```````````````````````````````` example
+<DIV CLASS="foo">
+
+*Markdown*
+
+</DIV>
+.
+<DIV CLASS="foo">
+<p><em>Markdown</em></p>
+</DIV>
+````````````````````````````````
+
+
+The tag on the first line can be partial, as long
+as it is split where there would be whitespace:
+
+```````````````````````````````` example
+<div id="foo"
+  class="bar">
+</div>
+.
+<div id="foo"
+  class="bar">
+</div>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<div id="foo" class="bar
+  baz">
+</div>
+.
+<div id="foo" class="bar
+  baz">
+</div>
+````````````````````````````````
+
+
+An open tag need not be closed:
+```````````````````````````````` example
+<div>
+*foo*
+
+*bar*
+.
+<div>
+*foo*
+<p><em>bar</em></p>
+````````````````````````````````
+
+
+
+A partial tag need not even be completed (garbage
+in, garbage out):
+
+```````````````````````````````` example
+<div id="foo"
+*hi*
+.
+<div id="foo"
+*hi*
+````````````````````````````````
+
+
+```````````````````````````````` example
+<div class
+foo
+.
+<div class
+foo
+````````````````````````````````
+
+
+The initial tag doesn't even need to be a valid
+tag, as long as it starts like one:
+
+```````````````````````````````` example
+<div *???-&&&-<---
+*foo*
+.
+<div *???-&&&-<---
+*foo*
+````````````````````````````````
+
+
+In type 6 blocks, the initial tag need not be on a line by
+itself:
+
+```````````````````````````````` example
+<div><a href="bar">*foo*</a></div>
+.
+<div><a href="bar">*foo*</a></div>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<table><tr><td>
+foo
+</td></tr></table>
+.
+<table><tr><td>
+foo
+</td></tr></table>
+````````````````````````````````
+
+
+Everything until the next blank line or end of document
+gets included in the HTML block.  So, in the following
+example, what looks like a Markdown code block
+is actually part of the HTML block, which continues until a blank
+line or the end of the document is reached:
+
+```````````````````````````````` example
+<div></div>
+``` c
+int x = 33;
+```
+.
+<div></div>
+``` c
+int x = 33;
+```
+````````````````````````````````
+
+
+To start an [HTML block] with a tag that is *not* in the
+list of block-level tags in (6), you must put the tag by
+itself on the first line (and it must be complete):
+
+```````````````````````````````` example
+<a href="foo">
+*bar*
+</a>
+.
+<a href="foo">
+*bar*
+</a>
+````````````````````````````````
+
+
+In type 7 blocks, the [tag name] can be anything:
+
+```````````````````````````````` example
+<Warning>
+*bar*
+</Warning>
+.
+<Warning>
+*bar*
+</Warning>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<i class="foo">
+*bar*
+</i>
+.
+<i class="foo">
+*bar*
+</i>
+````````````````````````````````
+
+
+```````````````````````````````` example
+</ins>
+*bar*
+.
+</ins>
+*bar*
+````````````````````````````````
+
+
+These rules are designed to allow us to work with tags that
+can function as either block-level or inline-level tags.
+The `<del>` tag is a nice example.  We can surround content with
+`<del>` tags in three different ways.  In this case, we get a raw
+HTML block, because the `<del>` tag is on a line by itself:
+
+```````````````````````````````` example
+<del>
+*foo*
+</del>
+.
+<del>
+*foo*
+</del>
+````````````````````````````````
+
+
+In this case, we get a raw HTML block that just includes
+the `<del>` tag (because it ends with the following blank
+line).  So the contents get interpreted as CommonMark:
+
+```````````````````````````````` example
+<del>
+
+*foo*
+
+</del>
+.
+<del>
+<p><em>foo</em></p>
+</del>
+````````````````````````````````
+
+
+Finally, in this case, the `<del>` tags are interpreted
+as [raw HTML] *inside* the CommonMark paragraph.  (Because
+the tag is not on a line by itself, we get inline HTML
+rather than an [HTML block].)
+
+```````````````````````````````` example
+<del>*foo*</del>
+.
+<p><del><em>foo</em></del></p>
+````````````````````````````````
+
+
+HTML tags designed to contain literal content
+(`pre`, `script`, `style`, `textarea`), comments, processing instructions,
+and declarations are treated somewhat differently.
+Instead of ending at the first blank line, these blocks
+end at the first line containing a corresponding end tag.
+As a result, these blocks can contain blank lines:
+
+A pre tag (type 1):
+
+```````````````````````````````` example
+<pre language="haskell"><code>
+import Text.HTML.TagSoup
+
+main :: IO ()
+main = print $ parseTags tags
+</code></pre>
+okay
+.
+<pre language="haskell"><code>
+import Text.HTML.TagSoup
+
+main :: IO ()
+main = print $ parseTags tags
+</code></pre>
+<p>okay</p>
+````````````````````````````````
+
+
+A script tag (type 1):
+
+```````````````````````````````` example
+<script type="text/javascript">
+// JavaScript example
+
+document.getElementById("demo").innerHTML = "Hello JavaScript!";
+</script>
+okay
+.
+<script type="text/javascript">
+// JavaScript example
+
+document.getElementById("demo").innerHTML = "Hello JavaScript!";
+</script>
+<p>okay</p>
+````````````````````````````````
+
+
+A textarea tag (type 1):
+
+```````````````````````````````` example
+<textarea>
+
+*foo*
+
+_bar_
+
+</textarea>
+.
+<textarea>
+
+*foo*
+
+_bar_
+
+</textarea>
+````````````````````````````````
+
+A style tag (type 1):
+
+```````````````````````````````` example
+<style
+  type="text/css">
+h1 {color:red;}
+
+p {color:blue;}
+</style>
+okay
+.
+<style
+  type="text/css">
+h1 {color:red;}
+
+p {color:blue;}
+</style>
+<p>okay</p>
+````````````````````````````````
+
+
+If there is no matching end tag, the block will end at the
+end of the document (or the enclosing [block quote][block quotes]
+or [list item][list items]):
+
+```````````````````````````````` example
+<style
+  type="text/css">
+
+foo
+.
+<style
+  type="text/css">
+
+foo
+````````````````````````````````
+
+
+```````````````````````````````` example
+> <div>
+> foo
+
+bar
+.
+<blockquote>
+<div>
+foo
+</blockquote>
+<p>bar</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+- <div>
+- foo
+.
+<ul>
+<li>
+<div>
+</li>
+<li>foo</li>
+</ul>
+````````````````````````````````
+
+
+The end tag can occur on the same line as the start tag:
+
+```````````````````````````````` example
+<style>p{color:red;}</style>
+*foo*
+.
+<style>p{color:red;}</style>
+<p><em>foo</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<!-- foo -->*bar*
+*baz*
+.
+<!-- foo -->*bar*
+<p><em>baz</em></p>
+````````````````````````````````
+
+
+Note that anything on the last line after the
+end tag will be included in the [HTML block]:
+
+```````````````````````````````` example
+<script>
+foo
+</script>1. *bar*
+.
+<script>
+foo
+</script>1. *bar*
+````````````````````````````````
+
+
+A comment (type 2):
+
+```````````````````````````````` example
+<!-- Foo
+
+bar
+   baz -->
+okay
+.
+<!-- Foo
+
+bar
+   baz -->
+<p>okay</p>
+````````````````````````````````
+
+
+
+A processing instruction (type 3):
+
+```````````````````````````````` example
+<?php
+
+  echo '>';
+
+?>
+okay
+.
+<?php
+
+  echo '>';
+
+?>
+<p>okay</p>
+````````````````````````````````
+
+
+A declaration (type 4):
+
+```````````````````````````````` example
+<!DOCTYPE html>
+.
+<!DOCTYPE html>
+````````````````````````````````
+
+
+CDATA (type 5):
+
+```````````````````````````````` example
+<![CDATA[
+function matchwo(a,b)
+{
+  if (a < b && a < 0) then {
+    return 1;
+
+  } else {
+
+    return 0;
+  }
+}
+]]>
+okay
+.
+<![CDATA[
+function matchwo(a,b)
+{
+  if (a < b && a < 0) then {
+    return 1;
+
+  } else {
+
+    return 0;
+  }
+}
+]]>
+<p>okay</p>
+````````````````````````````````
+
+
+The opening tag can be preceded by up to three spaces of indentation, but not
+four:
+
+```````````````````````````````` example
+  <!-- foo -->
+
+    <!-- foo -->
+.
+  <!-- foo -->
+<pre><code>&lt;!-- foo --&gt;
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+  <div>
+
+    <div>
+.
+  <div>
+<pre><code>&lt;div&gt;
+</code></pre>
+````````````````````````````````
+
+
+An HTML block of types 1--6 can interrupt a paragraph, and need not be
+preceded by a blank line.
+
+```````````````````````````````` example
+Foo
+<div>
+bar
+</div>
+.
+<p>Foo</p>
+<div>
+bar
+</div>
+````````````````````````````````
+
+
+However, a following blank line is needed, except at the end of
+a document, and except for blocks of types 1--5, [above][HTML
+block]:
+
+```````````````````````````````` example
+<div>
+bar
+</div>
+*foo*
+.
+<div>
+bar
+</div>
+*foo*
+````````````````````````````````
+
+
+HTML blocks of type 7 cannot interrupt a paragraph:
+
+```````````````````````````````` example
+Foo
+<a href="bar">
+baz
+.
+<p>Foo
+<a href="bar">
+baz</p>
+````````````````````````````````
+
+
+This rule differs from John Gruber's original Markdown syntax
+specification, which says:
+
+> The only restrictions are that block-level HTML elements —
+> e.g. `<div>`, `<table>`, `<pre>`, `<p>`, etc. — must be separated from
+> surrounding content by blank lines, and the start and end tags of the
+> block should not be indented with spaces or tabs.
+
+In some ways Gruber's rule is more restrictive than the one given
+here:
+
+- It requires that an HTML block be preceded by a blank line.
+- It does not allow the start tag to be indented.
+- It requires a matching end tag, which it also does not allow to
+  be indented.
+
+Most Markdown implementations (including some of Gruber's own) do not
+respect all of these restrictions.
+
+There is one respect, however, in which Gruber's rule is more liberal
+than the one given here, since it allows blank lines to occur inside
+an HTML block.  There are two reasons for disallowing them here.
+First, it removes the need to parse balanced tags, which is
+expensive and can require backtracking from the end of the document
+if no matching end tag is found. Second, it provides a very simple
+and flexible way of including Markdown content inside HTML tags:
+simply separate the Markdown from the HTML using blank lines:
+
+Compare:
+
+```````````````````````````````` example
+<div>
+
+*Emphasized* text.
+
+</div>
+.
+<div>
+<p><em>Emphasized</em> text.</p>
+</div>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<div>
+*Emphasized* text.
+</div>
+.
+<div>
+*Emphasized* text.
+</div>
+````````````````````````````````
+
+
+Some Markdown implementations have adopted a convention of
+interpreting content inside tags as text if the open tag has
+the attribute `markdown=1`.  The rule given above seems a simpler and
+more elegant way of achieving the same expressive power, which is also
+much simpler to parse.
+
+The main potential drawback is that one can no longer paste HTML
+blocks into Markdown documents with 100% reliability.  However,
+*in most cases* this will work fine, because the blank lines in
+HTML are usually followed by HTML block tags.  For example:
+
+```````````````````````````````` example
+<table>
+
+<tr>
+
+<td>
+Hi
+</td>
+
+</tr>
+
+</table>
+.
+<table>
+<tr>
+<td>
+Hi
+</td>
+</tr>
+</table>
+````````````````````````````````
+
+
+There are problems, however, if the inner tags are indented
+*and* separated by spaces, as then they will be interpreted as
+an indented code block:
+
+```````````````````````````````` example
+<table>
+
+  <tr>
+
+    <td>
+      Hi
+    </td>
+
+  </tr>
+
+</table>
+.
+<table>
+  <tr>
+<pre><code>&lt;td&gt;
+  Hi
+&lt;/td&gt;
+</code></pre>
+  </tr>
+</table>
+````````````````````````````````
+
+
+Fortunately, blank lines are usually not necessary and can be
+deleted.  The exception is inside `<pre>` tags, but as described
+[above][HTML blocks], raw HTML blocks starting with `<pre>`
+*can* contain blank lines.
+
+## Link reference definitions
+
+A [link reference definition](@)
+consists of a [link label], optionally preceded by up to three spaces of
+indentation, followed
+by a colon (`:`), optional spaces or tabs (including up to one
+[line ending]), a [link destination],
+optional spaces or tabs (including up to one
+[line ending]), and an optional [link
+title], which if it is present must be separated
+from the [link destination] by spaces or tabs.
+No further character may occur.
+
+A [link reference definition]
+does not correspond to a structural element of a document.  Instead, it
+defines a label which can be used in [reference links]
+and reference-style [images] elsewhere in the document.  [Link
+reference definitions] can come either before or after the links that use
+them.
+
+```````````````````````````````` example
+[foo]: /url "title"
+
+[foo]
+.
+<p><a href="/url" title="title">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+   [foo]: 
+      /url  
+           'the title'  
+
+[foo]
+.
+<p><a href="/url" title="the title">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[Foo*bar\]]:my_(url) 'title (with parens)'
+
+[Foo*bar\]]
+.
+<p><a href="my_(url)" title="title (with parens)">Foo*bar]</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[Foo bar]:
+<my url>
+'title'
+
+[Foo bar]
+.
+<p><a href="my%20url" title="title">Foo bar</a></p>
+````````````````````````````````
+
+
+The title may extend over multiple lines:
+
+```````````````````````````````` example
+[foo]: /url '
+title
+line1
+line2
+'
+
+[foo]
+.
+<p><a href="/url" title="
+title
+line1
+line2
+">foo</a></p>
+````````````````````````````````
+
+
+However, it may not contain a [blank line]:
+
+```````````````````````````````` example
+[foo]: /url 'title
+
+with blank line'
+
+[foo]
+.
+<p>[foo]: /url 'title</p>
+<p>with blank line'</p>
+<p>[foo]</p>
+````````````````````````````````
+
+
+The title may be omitted:
+
+```````````````````````````````` example
+[foo]:
+/url
+
+[foo]
+.
+<p><a href="/url">foo</a></p>
+````````````````````````````````
+
+
+The link destination may not be omitted:
+
+```````````````````````````````` example
+[foo]:
+
+[foo]
+.
+<p>[foo]:</p>
+<p>[foo]</p>
+````````````````````````````````
+
+ However, an empty link destination may be specified using
+ angle brackets:
+
+```````````````````````````````` example
+[foo]: <>
+
+[foo]
+.
+<p><a href="">foo</a></p>
+````````````````````````````````
+
+The title must be separated from the link destination by
+spaces or tabs:
+
+```````````````````````````````` example
+[foo]: <bar>(baz)
+
+[foo]
+.
+<p>[foo]: <bar>(baz)</p>
+<p>[foo]</p>
+````````````````````````````````
+
+
+Both title and destination can contain backslash escapes
+and literal backslashes:
+
+```````````````````````````````` example
+[foo]: /url\bar\*baz "foo\"bar\baz"
+
+[foo]
+.
+<p><a href="/url%5Cbar*baz" title="foo&quot;bar\baz">foo</a></p>
+````````````````````````````````
+
+
+A link can come before its corresponding definition:
+
+```````````````````````````````` example
+[foo]
+
+[foo]: url
+.
+<p><a href="url">foo</a></p>
+````````````````````````````````
+
+
+If there are several matching definitions, the first one takes
+precedence:
+
+```````````````````````````````` example
+[foo]
+
+[foo]: first
+[foo]: second
+.
+<p><a href="first">foo</a></p>
+````````````````````````````````
+
+
+As noted in the section on [Links], matching of labels is
+case-insensitive (see [matches]).
+
+```````````````````````````````` example
+[FOO]: /url
+
+[Foo]
+.
+<p><a href="/url">Foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[ΑΓΩ]: /φου
+
+[αγω]
+.
+<p><a href="/%CF%86%CE%BF%CF%85">αγω</a></p>
+````````````````````````````````
+
+
+Whether something is a [link reference definition] is
+independent of whether the link reference it defines is
+used in the document.  Thus, for example, the following
+document contains just a link reference definition, and
+no visible content:
+
+```````````````````````````````` example
+[foo]: /url
+.
+````````````````````````````````
+
+
+Here is another one:
+
+```````````````````````````````` example
+[
+foo
+]: /url
+bar
+.
+<p>bar</p>
+````````````````````````````````
+
+
+This is not a link reference definition, because there are
+characters other than spaces or tabs after the title:
+
+```````````````````````````````` example
+[foo]: /url "title" ok
+.
+<p>[foo]: /url &quot;title&quot; ok</p>
+````````````````````````````````
+
+
+This is a link reference definition, but it has no title:
+
+```````````````````````````````` example
+[foo]: /url
+"title" ok
+.
+<p>&quot;title&quot; ok</p>
+````````````````````````````````
+
+
+This is not a link reference definition, because it is indented
+four spaces:
+
+```````````````````````````````` example
+    [foo]: /url "title"
+
+[foo]
+.
+<pre><code>[foo]: /url &quot;title&quot;
+</code></pre>
+<p>[foo]</p>
+````````````````````````````````
+
+
+This is not a link reference definition, because it occurs inside
+a code block:
+
+```````````````````````````````` example
+```
+[foo]: /url
+```
+
+[foo]
+.
+<pre><code>[foo]: /url
+</code></pre>
+<p>[foo]</p>
+````````````````````````````````
+
+
+A [link reference definition] cannot interrupt a paragraph.
+
+```````````````````````````````` example
+Foo
+[bar]: /baz
+
+[bar]
+.
+<p>Foo
+[bar]: /baz</p>
+<p>[bar]</p>
+````````````````````````````````
+
+
+However, it can directly follow other block elements, such as headings
+and thematic breaks, and it need not be followed by a blank line.
+
+```````````````````````````````` example
+# [Foo]
+[foo]: /url
+> bar
+.
+<h1><a href="/url">Foo</a></h1>
+<blockquote>
+<p>bar</p>
+</blockquote>
+````````````````````````````````
+
+```````````````````````````````` example
+[foo]: /url
+bar
+===
+[foo]
+.
+<h1>bar</h1>
+<p><a href="/url">foo</a></p>
+````````````````````````````````
+
+```````````````````````````````` example
+[foo]: /url
+===
+[foo]
+.
+<p>===
+<a href="/url">foo</a></p>
+````````````````````````````````
+
+
+Several [link reference definitions]
+can occur one after another, without intervening blank lines.
+
+```````````````````````````````` example
+[foo]: /foo-url "foo"
+[bar]: /bar-url
+  "bar"
+[baz]: /baz-url
+
+[foo],
+[bar],
+[baz]
+.
+<p><a href="/foo-url" title="foo">foo</a>,
+<a href="/bar-url" title="bar">bar</a>,
+<a href="/baz-url">baz</a></p>
+````````````````````````````````
+
+
+[Link reference definitions] can occur
+inside block containers, like lists and block quotations.  They
+affect the entire document, not just the container in which they
+are defined:
+
+```````````````````````````````` example
+[foo]
+
+> [foo]: /url
+.
+<p><a href="/url">foo</a></p>
+<blockquote>
+</blockquote>
+````````````````````````````````
+
+
+## Paragraphs
+
+A sequence of non-blank lines that cannot be interpreted as other
+kinds of blocks forms a [paragraph](@).
+The contents of the paragraph are the result of parsing the
+paragraph's raw content as inlines.  The paragraph's raw content
+is formed by concatenating the lines and removing initial and final
+spaces or tabs.
+
+A simple example with two paragraphs:
+
+```````````````````````````````` example
+aaa
+
+bbb
+.
+<p>aaa</p>
+<p>bbb</p>
+````````````````````````````````
+
+
+Paragraphs can contain multiple lines, but no blank lines:
+
+```````````````````````````````` example
+aaa
+bbb
+
+ccc
+ddd
+.
+<p>aaa
+bbb</p>
+<p>ccc
+ddd</p>
+````````````````````````````````
+
+
+Multiple blank lines between paragraphs have no effect:
+
+```````````````````````````````` example
+aaa
+
+
+bbb
+.
+<p>aaa</p>
+<p>bbb</p>
+````````````````````````````````
+
+
+Leading spaces or tabs are skipped:
+
+```````````````````````````````` example
+  aaa
+ bbb
+.
+<p>aaa
+bbb</p>
+````````````````````````````````
+
+
+Lines after the first may be indented any amount, since indented
+code blocks cannot interrupt paragraphs.
+
+```````````````````````````````` example
+aaa
+             bbb
+                                       ccc
+.
+<p>aaa
+bbb
+ccc</p>
+````````````````````````````````
+
+
+However, the first line may be preceded by up to three spaces of indentation.
+Four spaces of indentation is too many:
+
+```````````````````````````````` example
+   aaa
+bbb
+.
+<p>aaa
+bbb</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+    aaa
+bbb
+.
+<pre><code>aaa
+</code></pre>
+<p>bbb</p>
+````````````````````````````````
+
+
+Final spaces or tabs are stripped before inline parsing, so a paragraph
+that ends with two or more spaces will not end with a [hard line
+break]:
+
+```````````````````````````````` example
+aaa     
+bbb     
+.
+<p>aaa<br />
+bbb</p>
+````````````````````````````````
+
+
+## Blank lines
+
+[Blank lines] between block-level elements are ignored,
+except for the role they play in determining whether a [list]
+is [tight] or [loose].
+
+Blank lines at the beginning and end of the document are also ignored.
+
+```````````````````````````````` example
+  
+
+aaa
+  
+
+# aaa
+
+  
+.
+<p>aaa</p>
+<h1>aaa</h1>
+````````````````````````````````
+
+
+
+# Container blocks
+
+A [container block](#container-blocks) is a block that has other
+blocks as its contents.  There are two basic kinds of container blocks:
+[block quotes] and [list items].
+[Lists] are meta-containers for [list items].
+
+We define the syntax for container blocks recursively.  The general
+form of the definition is:
+
+> If X is a sequence of blocks, then the result of
+> transforming X in such-and-such a way is a container of type Y
+> with these blocks as its content.
+
+So, we explain what counts as a block quote or list item by explaining
+how these can be *generated* from their contents. This should suffice
+to define the syntax, although it does not give a recipe for *parsing*
+these constructions.  (A recipe is provided below in the section entitled
+[A parsing strategy](#appendix-a-parsing-strategy).)
+
+## Block quotes
+
+A [block quote marker](@),
+optionally preceded by up to three spaces of indentation,
+consists of (a) the character `>` together with a following space of
+indentation, or (b) a single character `>` not followed by a space of
+indentation.
+
+The following rules define [block quotes]:
+
+1.  **Basic case.**  If a string of lines *Ls* constitute a sequence
+    of blocks *Bs*, then the result of prepending a [block quote
+    marker] to the beginning of each line in *Ls*
+    is a [block quote](#block-quotes) containing *Bs*.
+
+2.  **Laziness.**  If a string of lines *Ls* constitute a [block
+    quote](#block-quotes) with contents *Bs*, then the result of deleting
+    the initial [block quote marker] from one or
+    more lines in which the next character other than a space or tab after the
+    [block quote marker] is [paragraph continuation
+    text] is a block quote with *Bs* as its content.
+    [Paragraph continuation text](@) is text
+    that will be parsed as part of the content of a paragraph, but does
+    not occur at the beginning of the paragraph.
+
+3.  **Consecutiveness.**  A document cannot contain two [block
+    quotes] in a row unless there is a [blank line] between them.
+
+Nothing else counts as a [block quote](#block-quotes).
+
+Here is a simple example:
+
+```````````````````````````````` example
+> # Foo
+> bar
+> baz
+.
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
+````````````````````````````````
+
+
+The space or tab after the `>` characters can be omitted:
+
+```````````````````````````````` example
+># Foo
+>bar
+> baz
+.
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
+````````````````````````````````
+
+
+The `>` characters can be preceded by up to three spaces of indentation:
+
+```````````````````````````````` example
+   > # Foo
+   > bar
+ > baz
+.
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
+````````````````````````````````
+
+
+Four spaces of indentation is too many:
+
+```````````````````````````````` example
+    > # Foo
+    > bar
+    > baz
+.
+<pre><code>&gt; # Foo
+&gt; bar
+&gt; baz
+</code></pre>
+````````````````````````````````
+
+
+The Laziness clause allows us to omit the `>` before
+[paragraph continuation text]:
+
+```````````````````````````````` example
+> # Foo
+> bar
+baz
+.
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
+````````````````````````````````
+
+
+A block quote can contain some lazy and some non-lazy
+continuation lines:
+
+```````````````````````````````` example
+> bar
+baz
+> foo
+.
+<blockquote>
+<p>bar
+baz
+foo</p>
+</blockquote>
+````````````````````````````````
+
+
+Laziness only applies to lines that would have been continuations of
+paragraphs had they been prepended with [block quote markers].
+For example, the `> ` cannot be omitted in the second line of
+
+``` markdown
+> foo
+> ---
+```
+
+without changing the meaning:
+
+```````````````````````````````` example
+> foo
+---
+.
+<blockquote>
+<p>foo</p>
+</blockquote>
+<hr />
+````````````````````````````````
+
+
+Similarly, if we omit the `> ` in the second line of
+
+``` markdown
+> - foo
+> - bar
+```
+
+then the block quote ends after the first line:
+
+```````````````````````````````` example
+> - foo
+- bar
+.
+<blockquote>
+<ul>
+<li>foo</li>
+</ul>
+</blockquote>
+<ul>
+<li>bar</li>
+</ul>
+````````````````````````````````
+
+
+For the same reason, we can't omit the `> ` in front of
+subsequent lines of an indented or fenced code block:
+
+```````````````````````````````` example
+>     foo
+    bar
+.
+<blockquote>
+<pre><code>foo
+</code></pre>
+</blockquote>
+<pre><code>bar
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+> ```
+foo
+```
+.
+<blockquote>
+<pre><code></code></pre>
+</blockquote>
+<p>foo</p>
+<pre><code></code></pre>
+````````````````````````````````
+
+
+Note that in the following case, we have a [lazy
+continuation line]:
+
+```````````````````````````````` example
+> foo
+    - bar
+.
+<blockquote>
+<p>foo
+- bar</p>
+</blockquote>
+````````````````````````````````
+
+
+To see why, note that in
+
+```markdown
+> foo
+>     - bar
+```
+
+the `- bar` is indented too far to start a list, and can't
+be an indented code block because indented code blocks cannot
+interrupt paragraphs, so it is [paragraph continuation text].
+
+A block quote can be empty:
+
+```````````````````````````````` example
+>
+.
+<blockquote>
+</blockquote>
+````````````````````````````````
+
+
+```````````````````````````````` example
+>
+>  
+> 
+.
+<blockquote>
+</blockquote>
+````````````````````````````````
+
+
+A block quote can have initial or final blank lines:
+
+```````````````````````````````` example
+>
+> foo
+>  
+.
+<blockquote>
+<p>foo</p>
+</blockquote>
+````````````````````````````````
+
+
+A blank line always separates block quotes:
+
+```````````````````````````````` example
+> foo
+
+> bar
+.
+<blockquote>
+<p>foo</p>
+</blockquote>
+<blockquote>
+<p>bar</p>
+</blockquote>
+````````````````````````````````
+
+
+(Most current Markdown implementations, including John Gruber's
+original `Markdown.pl`, will parse this example as a single block quote
+with two paragraphs.  But it seems better to allow the author to decide
+whether two block quotes or one are wanted.)
+
+Consecutiveness means that if we put these block quotes together,
+we get a single block quote:
+
+```````````````````````````````` example
+> foo
+> bar
+.
+<blockquote>
+<p>foo
+bar</p>
+</blockquote>
+````````````````````````````````
+
+
+To get a block quote with two paragraphs, use:
+
+```````````````````````````````` example
+> foo
+>
+> bar
+.
+<blockquote>
+<p>foo</p>
+<p>bar</p>
+</blockquote>
+````````````````````````````````
+
+
+Block quotes can interrupt paragraphs:
+
+```````````````````````````````` example
+foo
+> bar
+.
+<p>foo</p>
+<blockquote>
+<p>bar</p>
+</blockquote>
+````````````````````````````````
+
+
+In general, blank lines are not needed before or after block
+quotes:
+
+```````````````````````````````` example
+> aaa
+***
+> bbb
+.
+<blockquote>
+<p>aaa</p>
+</blockquote>
+<hr />
+<blockquote>
+<p>bbb</p>
+</blockquote>
+````````````````````````````````
+
+
+However, because of laziness, a blank line is needed between
+a block quote and a following paragraph:
+
+```````````````````````````````` example
+> bar
+baz
+.
+<blockquote>
+<p>bar
+baz</p>
+</blockquote>
+````````````````````````````````
+
+
+```````````````````````````````` example
+> bar
+
+baz
+.
+<blockquote>
+<p>bar</p>
+</blockquote>
+<p>baz</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+> bar
+>
+baz
+.
+<blockquote>
+<p>bar</p>
+</blockquote>
+<p>baz</p>
+````````````````````````````````
+
+
+It is a consequence of the Laziness rule that any number
+of initial `>`s may be omitted on a continuation line of a
+nested block quote:
+
+```````````````````````````````` example
+> > > foo
+bar
+.
+<blockquote>
+<blockquote>
+<blockquote>
+<p>foo
+bar</p>
+</blockquote>
+</blockquote>
+</blockquote>
+````````````````````````````````
+
+
+```````````````````````````````` example
+>>> foo
+> bar
+>>baz
+.
+<blockquote>
+<blockquote>
+<blockquote>
+<p>foo
+bar
+baz</p>
+</blockquote>
+</blockquote>
+</blockquote>
+````````````````````````````````
+
+
+When including an indented code block in a block quote,
+remember that the [block quote marker] includes
+both the `>` and a following space of indentation.  So *five spaces* are needed
+after the `>`:
+
+```````````````````````````````` example
+>     code
+
+>    not code
+.
+<blockquote>
+<pre><code>code
+</code></pre>
+</blockquote>
+<blockquote>
+<p>not code</p>
+</blockquote>
+````````````````````````````````
+
+
+
+## List items
+
+A [list marker](@) is a
+[bullet list marker] or an [ordered list marker].
+
+A [bullet list marker](@)
+is a `-`, `+`, or `*` character.
+
+An [ordered list marker](@)
+is a sequence of 1--9 arabic digits (`0-9`), followed by either a
+`.` character or a `)` character.  (The reason for the length
+limit is that with 10 digits we start seeing integer overflows
+in some browsers.)
+
+The following rules define [list items]:
+
+1.  **Basic case.**  If a sequence of lines *Ls* constitute a sequence of
+    blocks *Bs* starting with a character other than a space or tab, and *M* is
+    a list marker of width *W* followed by 1 ≤ *N* ≤ 4 spaces of indentation,
+    then the result of prepending *M* and the following spaces to the first line
+    of Ls*, and indenting subsequent lines of *Ls* by *W + N* spaces, is a
+    list item with *Bs* as its contents.  The type of the list item
+    (bullet or ordered) is determined by the type of its list marker.
+    If the list item is ordered, then it is also assigned a start
+    number, based on the ordered list marker.
+
+    Exceptions:
+
+    1. When the first list item in a [list] interrupts
+       a paragraph---that is, when it starts on a line that would
+       otherwise count as [paragraph continuation text]---then (a)
+       the lines *Ls* must not begin with a blank line, and (b) if
+       the list item is ordered, the start number must be 1.
+    2. If any line is a [thematic break][thematic breaks] then
+       that line is not a list item.
+
+For example, let *Ls* be the lines
+
+```````````````````````````````` example
+A paragraph
+with two lines.
+
+    indented code
+
+> A block quote.
+.
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+````````````````````````````````
+
+
+And let *M* be the marker `1.`, and *N* = 2.  Then rule #1 says
+that the following is an ordered list item with start number 1,
+and the same contents as *Ls*:
+
+```````````````````````````````` example
+1.  A paragraph
+    with two lines.
+
+        indented code
+
+    > A block quote.
+.
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
+````````````````````````````````
+
+
+The most important thing to notice is that the position of
+the text after the list marker determines how much indentation
+is needed in subsequent blocks in the list item.  If the list
+marker takes up two spaces of indentation, and there are three spaces between
+the list marker and the next character other than a space or tab, then blocks
+must be indented five spaces in order to fall under the list
+item.
+
+Here are some examples showing how far content must be indented to be
+put under the list item:
+
+```````````````````````````````` example
+- one
+
+ two
+.
+<ul>
+<li>one</li>
+</ul>
+<p>two</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+- one
+
+  two
+.
+<ul>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+ -    one
+
+     two
+.
+<ul>
+<li>one</li>
+</ul>
+<pre><code> two
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+ -    one
+
+      two
+.
+<ul>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+It is tempting to think of this in terms of columns:  the continuation
+blocks must be indented at least to the column of the first character other than
+a space or tab after the list marker.  However, that is not quite right.
+The spaces of indentation after the list marker determine how much relative
+indentation is needed.  Which column this indentation reaches will depend on
+how the list item is embedded in other constructions, as shown by
+this example:
+
+```````````````````````````````` example
+   > > 1.  one
+>>
+>>     two
+.
+<blockquote>
+<blockquote>
+<ol>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ol>
+</blockquote>
+</blockquote>
+````````````````````````````````
+
+
+Here `two` occurs in the same column as the list marker `1.`,
+but is actually contained in the list item, because there is
+sufficient indentation after the last containing blockquote marker.
+
+The converse is also possible.  In the following example, the word `two`
+occurs far to the right of the initial text of the list item, `one`, but
+it is not considered part of the list item, because it is not indented
+far enough past the blockquote marker:
+
+```````````````````````````````` example
+>>- one
+>>
+  >  > two
+.
+<blockquote>
+<blockquote>
+<ul>
+<li>one</li>
+</ul>
+<p>two</p>
+</blockquote>
+</blockquote>
+````````````````````````````````
+
+
+Note that at least one space or tab is needed between the list marker and
+any following content, so these are not list items:
+
+```````````````````````````````` example
+-one
+
+2.two
+.
+<p>-one</p>
+<p>2.two</p>
+````````````````````````````````
+
+
+A list item may contain blocks that are separated by more than
+one blank line.
+
+```````````````````````````````` example
+- foo
+
+
+  bar
+.
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+A list item may contain any kind of block:
+
+```````````````````````````````` example
+1.  foo
+
+    ```
+    bar
+    ```
+
+    baz
+
+    > bam
+.
+<ol>
+<li>
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+<p>baz</p>
+<blockquote>
+<p>bam</p>
+</blockquote>
+</li>
+</ol>
+````````````````````````````````
+
+
+A list item that contains an indented code block will preserve
+empty lines within the code block verbatim.
+
+```````````````````````````````` example
+- Foo
+
+      bar
+
+
+      baz
+.
+<ul>
+<li>
+<p>Foo</p>
+<pre><code>bar
+
+
+baz
+</code></pre>
+</li>
+</ul>
+````````````````````````````````
+
+Note that ordered list start numbers must be nine digits or less:
+
+```````````````````````````````` example
+123456789. ok
+.
+<ol start="123456789">
+<li>ok</li>
+</ol>
+````````````````````````````````
+
+
+```````````````````````````````` example
+1234567890. not ok
+.
+<p>1234567890. not ok</p>
+````````````````````````````````
+
+
+A start number may begin with 0s:
+
+```````````````````````````````` example
+0. ok
+.
+<ol start="0">
+<li>ok</li>
+</ol>
+````````````````````````````````
+
+
+```````````````````````````````` example
+003. ok
+.
+<ol start="3">
+<li>ok</li>
+</ol>
+````````````````````````````````
+
+
+A start number may not be negative:
+
+```````````````````````````````` example
+-1. not ok
+.
+<p>-1. not ok</p>
+````````````````````````````````
+
+
+
+2.  **Item starting with indented code.**  If a sequence of lines *Ls*
+    constitute a sequence of blocks *Bs* starting with an indented code
+    block, and *M* is a list marker of width *W* followed by
+    one space of indentation, then the result of prepending *M* and the
+    following space to the first line of *Ls*, and indenting subsequent lines
+    of *Ls* by *W + 1* spaces, is a list item with *Bs* as its contents.
+    If a line is empty, then it need not be indented.  The type of the
+    list item (bullet or ordered) is determined by the type of its list
+    marker.  If the list item is ordered, then it is also assigned a
+    start number, based on the ordered list marker.
+
+An indented code block will have to be preceded by four spaces of indentation
+beyond the edge of the region where text will be included in the list item.
+In the following case that is 6 spaces:
+
+```````````````````````````````` example
+- foo
+
+      bar
+.
+<ul>
+<li>
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+</li>
+</ul>
+````````````````````````````````
+
+
+And in this case it is 11 spaces:
+
+```````````````````````````````` example
+  10.  foo
+
+           bar
+.
+<ol start="10">
+<li>
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+</li>
+</ol>
+````````````````````````````````
+
+
+If the *first* block in the list item is an indented code block,
+then by rule #2, the contents must be preceded by *one* space of indentation
+after the list marker:
+
+```````````````````````````````` example
+    indented code
+
+paragraph
+
+    more code
+.
+<pre><code>indented code
+</code></pre>
+<p>paragraph</p>
+<pre><code>more code
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+1.     indented code
+
+   paragraph
+
+       more code
+.
+<ol>
+<li>
+<pre><code>indented code
+</code></pre>
+<p>paragraph</p>
+<pre><code>more code
+</code></pre>
+</li>
+</ol>
+````````````````````````````````
+
+
+Note that an additional space of indentation is interpreted as space
+inside the code block:
+
+```````````````````````````````` example
+1.      indented code
+
+   paragraph
+
+       more code
+.
+<ol>
+<li>
+<pre><code> indented code
+</code></pre>
+<p>paragraph</p>
+<pre><code>more code
+</code></pre>
+</li>
+</ol>
+````````````````````````````````
+
+
+Note that rules #1 and #2 only apply to two cases:  (a) cases
+in which the lines to be included in a list item begin with a
+character other than a space or tab, and (b) cases in which
+they begin with an indented code
+block.  In a case like the following, where the first block begins with
+three spaces of indentation, the rules do not allow us to form a list item by
+indenting the whole thing and prepending a list marker:
+
+```````````````````````````````` example
+   foo
+
+bar
+.
+<p>foo</p>
+<p>bar</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+-    foo
+
+  bar
+.
+<ul>
+<li>foo</li>
+</ul>
+<p>bar</p>
+````````````````````````````````
+
+
+This is not a significant restriction, because when a block is preceded by up to
+three spaces of indentation, the indentation can always be removed without
+a change in interpretation, allowing rule #1 to be applied.  So, in
+the above case:
+
+```````````````````````````````` example
+-  foo
+
+   bar
+.
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+3.  **Item starting with a blank line.**  If a sequence of lines *Ls*
+    starting with a single [blank line] constitute a (possibly empty)
+    sequence of blocks *Bs*, and *M* is a list marker of width *W*,
+    then the result of prepending *M* to the first line of *Ls*, and
+    preceding subsequent lines of *Ls* by *W + 1* spaces of indentation, is a
+    list item with *Bs* as its contents.
+    If a line is empty, then it need not be indented.  The type of the
+    list item (bullet or ordered) is determined by the type of its list
+    marker.  If the list item is ordered, then it is also assigned a
+    start number, based on the ordered list marker.
+
+Here are some list items that start with a blank line but are not empty:
+
+```````````````````````````````` example
+-
+  foo
+-
+  ```
+  bar
+  ```
+-
+      baz
+.
+<ul>
+<li>foo</li>
+<li>
+<pre><code>bar
+</code></pre>
+</li>
+<li>
+<pre><code>baz
+</code></pre>
+</li>
+</ul>
+````````````````````````````````
+
+When the list item starts with a blank line, the number of spaces
+following the list marker doesn't change the required indentation:
+
+```````````````````````````````` example
+-   
+  foo
+.
+<ul>
+<li>foo</li>
+</ul>
+````````````````````````````````
+
+
+A list item can begin with at most one blank line.
+In the following example, `foo` is not part of the list
+item:
+
+```````````````````````````````` example
+-
+
+  foo
+.
+<ul>
+<li></li>
+</ul>
+<p>foo</p>
+````````````````````````````````
+
+
+Here is an empty bullet list item:
+
+```````````````````````````````` example
+- foo
+-
+- bar
+.
+<ul>
+<li>foo</li>
+<li></li>
+<li>bar</li>
+</ul>
+````````````````````````````````
+
+
+It does not matter whether there are spaces or tabs following the [list marker]:
+
+```````````````````````````````` example
+- foo
+-   
+- bar
+.
+<ul>
+<li>foo</li>
+<li></li>
+<li>bar</li>
+</ul>
+````````````````````````````````
+
+
+Here is an empty ordered list item:
+
+```````````````````````````````` example
+1. foo
+2.
+3. bar
+.
+<ol>
+<li>foo</li>
+<li></li>
+<li>bar</li>
+</ol>
+````````````````````````````````
+
+
+A list may start or end with an empty list item:
+
+```````````````````````````````` example
+*
+.
+<ul>
+<li></li>
+</ul>
+````````````````````````````````
+
+However, an empty list item cannot interrupt a paragraph:
+
+```````````````````````````````` example
+foo
+*
+
+foo
+1.
+.
+<p>foo
+*</p>
+<p>foo
+1.</p>
+````````````````````````````````
+
+
+4.  **Indentation.**  If a sequence of lines *Ls* constitutes a list item
+    according to rule #1, #2, or #3, then the result of preceding each line
+    of *Ls* by up to three spaces of indentation (the same for each line) also
+    constitutes a list item with the same contents and attributes.  If a line is
+    empty, then it need not be indented.
+
+Indented one space:
+
+```````````````````````````````` example
+ 1.  A paragraph
+     with two lines.
+
+         indented code
+
+     > A block quote.
+.
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
+````````````````````````````````
+
+
+Indented two spaces:
+
+```````````````````````````````` example
+  1.  A paragraph
+      with two lines.
+
+          indented code
+
+      > A block quote.
+.
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
+````````````````````````````````
+
+
+Indented three spaces:
+
+```````````````````````````````` example
+   1.  A paragraph
+       with two lines.
+
+           indented code
+
+       > A block quote.
+.
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
+````````````````````````````````
+
+
+Four spaces indent gives a code block:
+
+```````````````````````````````` example
+    1.  A paragraph
+        with two lines.
+
+            indented code
+
+        > A block quote.
+.
+<pre><code>1.  A paragraph
+    with two lines.
+
+        indented code
+
+    &gt; A block quote.
+</code></pre>
+````````````````````````````````
+
+
+
+5.  **Laziness.**  If a string of lines *Ls* constitute a [list
+    item](#list-items) with contents *Bs*, then the result of deleting
+    some or all of the indentation from one or more lines in which the
+    next character other than a space or tab after the indentation is
+    [paragraph continuation text] is a
+    list item with the same contents and attributes.  The unindented
+    lines are called
+    [lazy continuation line](@)s.
+
+Here is an example with [lazy continuation lines]:
+
+```````````````````````````````` example
+  1.  A paragraph
+with two lines.
+
+          indented code
+
+      > A block quote.
+.
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
+````````````````````````````````
+
+
+Indentation can be partially deleted:
+
+```````````````````````````````` example
+  1.  A paragraph
+    with two lines.
+.
+<ol>
+<li>A paragraph
+with two lines.</li>
+</ol>
+````````````````````````````````
+
+
+These examples show how laziness can work in nested structures:
+
+```````````````````````````````` example
+> 1. > Blockquote
+continued here.
+.
+<blockquote>
+<ol>
+<li>
+<blockquote>
+<p>Blockquote
+continued here.</p>
+</blockquote>
+</li>
+</ol>
+</blockquote>
+````````````````````````````````
+
+
+```````````````````````````````` example
+> 1. > Blockquote
+> continued here.
+.
+<blockquote>
+<ol>
+<li>
+<blockquote>
+<p>Blockquote
+continued here.</p>
+</blockquote>
+</li>
+</ol>
+</blockquote>
+````````````````````````````````
+
+
+
+6.  **That's all.** Nothing that is not counted as a list item by rules
+    #1--5 counts as a [list item](#list-items).
+
+The rules for sublists follow from the general rules
+[above][List items].  A sublist must be indented the same number
+of spaces of indentation a paragraph would need to be in order to be included
+in the list item.
+
+So, in this case we need two spaces indent:
+
+```````````````````````````````` example
+- foo
+  - bar
+    - baz
+      - boo
+.
+<ul>
+<li>foo
+<ul>
+<li>bar
+<ul>
+<li>baz
+<ul>
+<li>boo</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+````````````````````````````````
+
+
+One is not enough:
+
+```````````````````````````````` example
+- foo
+ - bar
+  - baz
+   - boo
+.
+<ul>
+<li>foo</li>
+<li>bar</li>
+<li>baz</li>
+<li>boo</li>
+</ul>
+````````````````````````````````
+
+
+Here we need four, because the list marker is wider:
+
+```````````````````````````````` example
+10) foo
+    - bar
+.
+<ol start="10">
+<li>foo
+<ul>
+<li>bar</li>
+</ul>
+</li>
+</ol>
+````````````````````````````````
+
+
+Three is not enough:
+
+```````````````````````````````` example
+10) foo
+   - bar
+.
+<ol start="10">
+<li>foo</li>
+</ol>
+<ul>
+<li>bar</li>
+</ul>
+````````````````````````````````
+
+
+A list may be the first block in a list item:
+
+```````````````````````````````` example
+- - foo
+.
+<ul>
+<li>
+<ul>
+<li>foo</li>
+</ul>
+</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+1. - 2. foo
+.
+<ol>
+<li>
+<ul>
+<li>
+<ol start="2">
+<li>foo</li>
+</ol>
+</li>
+</ul>
+</li>
+</ol>
+````````````````````````````````
+
+
+A list item can contain a heading:
+
+```````````````````````````````` example
+- # Foo
+- Bar
+  ---
+  baz
+.
+<ul>
+<li>
+<h1>Foo</h1>
+</li>
+<li>
+<h2>Bar</h2>
+baz</li>
+</ul>
+````````````````````````````````
+
+
+### Motivation
+
+John Gruber's Markdown spec says the following about list items:
+
+1. "List markers typically start at the left margin, but may be indented
+   by up to three spaces. List markers must be followed by one or more
+   spaces or a tab."
+
+2. "To make lists look nice, you can wrap items with hanging indents....
+   But if you don't want to, you don't have to."
+
+3. "List items may consist of multiple paragraphs. Each subsequent
+   paragraph in a list item must be indented by either 4 spaces or one
+   tab."
+
+4. "It looks nice if you indent every line of the subsequent paragraphs,
+   but here again, Markdown will allow you to be lazy."
+
+5. "To put a blockquote within a list item, the blockquote's `>`
+   delimiters need to be indented."
+
+6. "To put a code block within a list item, the code block needs to be
+   indented twice — 8 spaces or two tabs."
+
+These rules specify that a paragraph under a list item must be indented
+four spaces (presumably, from the left margin, rather than the start of
+the list marker, but this is not said), and that code under a list item
+must be indented eight spaces instead of the usual four.  They also say
+that a block quote must be indented, but not by how much; however, the
+example given has four spaces indentation.  Although nothing is said
+about other kinds of block-level content, it is certainly reasonable to
+infer that *all* block elements under a list item, including other
+lists, must be indented four spaces.  This principle has been called the
+*four-space rule*.
+
+The four-space rule is clear and principled, and if the reference
+implementation `Markdown.pl` had followed it, it probably would have
+become the standard.  However, `Markdown.pl` allowed paragraphs and
+sublists to start with only two spaces indentation, at least on the
+outer level.  Worse, its behavior was inconsistent: a sublist of an
+outer-level list needed two spaces indentation, but a sublist of this
+sublist needed three spaces.  It is not surprising, then, that different
+implementations of Markdown have developed very different rules for
+determining what comes under a list item.  (Pandoc and python-Markdown,
+for example, stuck with Gruber's syntax description and the four-space
+rule, while discount, redcarpet, marked, PHP Markdown, and others
+followed `Markdown.pl`'s behavior more closely.)
+
+Unfortunately, given the divergences between implementations, there
+is no way to give a spec for list items that will be guaranteed not
+to break any existing documents.  However, the spec given here should
+correctly handle lists formatted with either the four-space rule or
+the more forgiving `Markdown.pl` behavior, provided they are laid out
+in a way that is natural for a human to read.
+
+The strategy here is to let the width and indentation of the list marker
+determine the indentation necessary for blocks to fall under the list
+item, rather than having a fixed and arbitrary number.  The writer can
+think of the body of the list item as a unit which gets indented to the
+right enough to fit the list marker (and any indentation on the list
+marker).  (The laziness rule, #5, then allows continuation lines to be
+unindented if needed.)
+
+This rule is superior, we claim, to any rule requiring a fixed level of
+indentation from the margin.  The four-space rule is clear but
+unnatural. It is quite unintuitive that
+
+``` markdown
+- foo
+
+  bar
+
+  - baz
+```
+
+should be parsed as two lists with an intervening paragraph,
+
+``` html
+<ul>
+<li>foo</li>
+</ul>
+<p>bar</p>
+<ul>
+<li>baz</li>
+</ul>
+```
+
+as the four-space rule demands, rather than a single list,
+
+``` html
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+<ul>
+<li>baz</li>
+</ul>
+</li>
+</ul>
+```
+
+The choice of four spaces is arbitrary.  It can be learned, but it is
+not likely to be guessed, and it trips up beginners regularly.
+
+Would it help to adopt a two-space rule?  The problem is that such
+a rule, together with the rule allowing up to three spaces of indentation for
+the initial list marker, allows text that is indented *less than* the
+original list marker to be included in the list item. For example,
+`Markdown.pl` parses
+
+``` markdown
+   - one
+
+  two
+```
+
+as a single list item, with `two` a continuation paragraph:
+
+``` html
+<ul>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ul>
+```
+
+and similarly
+
+``` markdown
+>   - one
+>
+>  two
+```
+
+as
+
+``` html
+<blockquote>
+<ul>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ul>
+</blockquote>
+```
+
+This is extremely unintuitive.
+
+Rather than requiring a fixed indent from the margin, we could require
+a fixed indent (say, two spaces, or even one space) from the list marker (which
+may itself be indented).  This proposal would remove the last anomaly
+discussed.  Unlike the spec presented above, it would count the following
+as a list item with a subparagraph, even though the paragraph `bar`
+is not indented as far as the first paragraph `foo`:
+
+``` markdown
+ 10. foo
+
+   bar  
+```
+
+Arguably this text does read like a list item with `bar` as a subparagraph,
+which may count in favor of the proposal.  However, on this proposal indented
+code would have to be indented six spaces after the list marker.  And this
+would break a lot of existing Markdown, which has the pattern:
+
+``` markdown
+1.  foo
+
+        indented code
+```
+
+where the code is indented eight spaces.  The spec above, by contrast, will
+parse this text as expected, since the code block's indentation is measured
+from the beginning of `foo`.
+
+The one case that needs special treatment is a list item that *starts*
+with indented code.  How much indentation is required in that case, since
+we don't have a "first paragraph" to measure from?  Rule #2 simply stipulates
+that in such cases, we require one space indentation from the list marker
+(and then the normal four spaces for the indented code).  This will match the
+four-space rule in cases where the list marker plus its initial indentation
+takes four spaces (a common case), but diverge in other cases.
+
+## Lists
+
+A [list](@) is a sequence of one or more
+list items [of the same type].  The list items
+may be separated by any number of blank lines.
+
+Two list items are [of the same type](@)
+if they begin with a [list marker] of the same type.
+Two list markers are of the
+same type if (a) they are bullet list markers using the same character
+(`-`, `+`, or `*`) or (b) they are ordered list numbers with the same
+delimiter (either `.` or `)`).
+
+A list is an [ordered list](@)
+if its constituent list items begin with
+[ordered list markers], and a
+[bullet list](@) if its constituent list
+items begin with [bullet list markers].
+
+The [start number](@)
+of an [ordered list] is determined by the list number of
+its initial list item.  The numbers of subsequent list items are
+disregarded.
+
+A list is [loose](@) if any of its constituent
+list items are separated by blank lines, or if any of its constituent
+list items directly contain two block-level elements with a blank line
+between them.  Otherwise a list is [tight](@).
+(The difference in HTML output is that paragraphs in a loose list are
+wrapped in `<p>` tags, while paragraphs in a tight list are not.)
+
+Changing the bullet or ordered list delimiter starts a new list:
+
+```````````````````````````````` example
+- foo
+- bar
++ baz
+.
+<ul>
+<li>foo</li>
+<li>bar</li>
+</ul>
+<ul>
+<li>baz</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+1. foo
+2. bar
+3) baz
+.
+<ol>
+<li>foo</li>
+<li>bar</li>
+</ol>
+<ol start="3">
+<li>baz</li>
+</ol>
+````````````````````````````````
+
+
+In CommonMark, a list can interrupt a paragraph. That is,
+no blank line is needed to separate a paragraph from a following
+list:
+
+```````````````````````````````` example
+Foo
+- bar
+- baz
+.
+<p>Foo</p>
+<ul>
+<li>bar</li>
+<li>baz</li>
+</ul>
+````````````````````````````````
+
+`Markdown.pl` does not allow this, through fear of triggering a list
+via a numeral in a hard-wrapped line:
+
+``` markdown
+The number of windows in my house is
+14.  The number of doors is 6.
+```
+
+Oddly, though, `Markdown.pl` *does* allow a blockquote to
+interrupt a paragraph, even though the same considerations might
+apply.
+
+In CommonMark, we do allow lists to interrupt paragraphs, for
+two reasons.  First, it is natural and not uncommon for people
+to start lists without blank lines:
+
+``` markdown
+I need to buy
+- new shoes
+- a coat
+- a plane ticket
+```
+
+Second, we are attracted to a
+
+> [principle of uniformity](@):
+> if a chunk of text has a certain
+> meaning, it will continue to have the same meaning when put into a
+> container block (such as a list item or blockquote).
+
+(Indeed, the spec for [list items] and [block quotes] presupposes
+this principle.) This principle implies that if
+
+``` markdown
+  * I need to buy
+    - new shoes
+    - a coat
+    - a plane ticket
+```
+
+is a list item containing a paragraph followed by a nested sublist,
+as all Markdown implementations agree it is (though the paragraph
+may be rendered without `<p>` tags, since the list is "tight"),
+then
+
+``` markdown
+I need to buy
+- new shoes
+- a coat
+- a plane ticket
+```
+
+by itself should be a paragraph followed by a nested sublist.
+
+Since it is well established Markdown practice to allow lists to
+interrupt paragraphs inside list items, the [principle of
+uniformity] requires us to allow this outside list items as
+well.  ([reStructuredText](http://docutils.sourceforge.net/rst.html)
+takes a different approach, requiring blank lines before lists
+even inside other list items.)
+
+In order to solve of unwanted lists in paragraphs with
+hard-wrapped numerals, we allow only lists starting with `1` to
+interrupt paragraphs.  Thus,
+
+```````````````````````````````` example
+The number of windows in my house is
+14.  The number of doors is 6.
+.
+<p>The number of windows in my house is
+14.  The number of doors is 6.</p>
+````````````````````````````````
+
+We may still get an unintended result in cases like
+
+```````````````````````````````` example
+The number of windows in my house is
+1.  The number of doors is 6.
+.
+<p>The number of windows in my house is</p>
+<ol>
+<li>The number of doors is 6.</li>
+</ol>
+````````````````````````````````
+
+but this rule should prevent most spurious list captures.
+
+There can be any number of blank lines between items:
+
+```````````````````````````````` example
+- foo
+
+- bar
+
+
+- baz
+.
+<ul>
+<li>
+<p>foo</p>
+</li>
+<li>
+<p>bar</p>
+</li>
+<li>
+<p>baz</p>
+</li>
+</ul>
+````````````````````````````````
+
+```````````````````````````````` example
+- foo
+  - bar
+    - baz
+
+
+      bim
+.
+<ul>
+<li>foo
+<ul>
+<li>bar
+<ul>
+<li>
+<p>baz</p>
+<p>bim</p>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+````````````````````````````````
+
+
+To separate consecutive lists of the same type, or to separate a
+list from an indented code block that would otherwise be parsed
+as a subparagraph of the final list item, you can insert a blank HTML
+comment:
+
+```````````````````````````````` example
+- foo
+- bar
+
+<!-- -->
+
+- baz
+- bim
+.
+<ul>
+<li>foo</li>
+<li>bar</li>
+</ul>
+<!-- -->
+<ul>
+<li>baz</li>
+<li>bim</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+-   foo
+
+    notcode
+
+-   foo
+
+<!-- -->
+
+    code
+.
+<ul>
+<li>
+<p>foo</p>
+<p>notcode</p>
+</li>
+<li>
+<p>foo</p>
+</li>
+</ul>
+<!-- -->
+<pre><code>code
+</code></pre>
+````````````````````````````````
+
+
+List items need not be indented to the same level.  The following
+list items will be treated as items at the same list level,
+since none is indented enough to belong to the previous list
+item:
+
+```````````````````````````````` example
+- a
+ - b
+  - c
+   - d
+  - e
+ - f
+- g
+.
+<ul>
+<li>a</li>
+<li>b</li>
+<li>c</li>
+<li>d</li>
+<li>e</li>
+<li>f</li>
+<li>g</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+1. a
+
+  2. b
+
+   3. c
+.
+<ol>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+<li>
+<p>c</p>
+</li>
+</ol>
+````````````````````````````````
+
+Note, however, that list items may not be preceded by more than
+three spaces of indentation.  Here `- e` is treated as a paragraph continuation
+line, because it is indented more than three spaces:
+
+```````````````````````````````` example
+- a
+ - b
+  - c
+   - d
+    - e
+.
+<ul>
+<li>a</li>
+<li>b</li>
+<li>c</li>
+<li>d
+- e</li>
+</ul>
+````````````````````````````````
+
+And here, `3. c` is treated as in indented code block,
+because it is indented four spaces and preceded by a
+blank line.
+
+```````````````````````````````` example
+1. a
+
+  2. b
+
+    3. c
+.
+<ol>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+</ol>
+<pre><code>3. c
+</code></pre>
+````````````````````````````````
+
+
+This is a loose list, because there is a blank line between
+two of the list items:
+
+```````````````````````````````` example
+- a
+- b
+
+- c
+.
+<ul>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+<li>
+<p>c</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+So is this, with a empty second item:
+
+```````````````````````````````` example
+* a
+*
+
+* c
+.
+<ul>
+<li>
+<p>a</p>
+</li>
+<li></li>
+<li>
+<p>c</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+These are loose lists, even though there are no blank lines between the items,
+because one of the items directly contains two block-level elements
+with a blank line between them:
+
+```````````````````````````````` example
+- a
+- b
+
+  c
+- d
+.
+<ul>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+<p>c</p>
+</li>
+<li>
+<p>d</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+- a
+- b
+
+  [ref]: /url
+- d
+.
+<ul>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+<li>
+<p>d</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+This is a tight list, because the blank lines are in a code block:
+
+```````````````````````````````` example
+- a
+- ```
+  b
+
+
+  ```
+- c
+.
+<ul>
+<li>a</li>
+<li>
+<pre><code>b
+
+
+</code></pre>
+</li>
+<li>c</li>
+</ul>
+````````````````````````````````
+
+
+This is a tight list, because the blank line is between two
+paragraphs of a sublist.  So the sublist is loose while
+the outer list is tight:
+
+```````````````````````````````` example
+- a
+  - b
+
+    c
+- d
+.
+<ul>
+<li>a
+<ul>
+<li>
+<p>b</p>
+<p>c</p>
+</li>
+</ul>
+</li>
+<li>d</li>
+</ul>
+````````````````````````````````
+
+
+This is a tight list, because the blank line is inside the
+block quote:
+
+```````````````````````````````` example
+* a
+  > b
+  >
+* c
+.
+<ul>
+<li>a
+<blockquote>
+<p>b</p>
+</blockquote>
+</li>
+<li>c</li>
+</ul>
+````````````````````````````````
+
+
+This list is tight, because the consecutive block elements
+are not separated by blank lines:
+
+```````````````````````````````` example
+- a
+  > b
+  ```
+  c
+  ```
+- d
+.
+<ul>
+<li>a
+<blockquote>
+<p>b</p>
+</blockquote>
+<pre><code>c
+</code></pre>
+</li>
+<li>d</li>
+</ul>
+````````````````````````````````
+
+
+A single-paragraph list is tight:
+
+```````````````````````````````` example
+- a
+.
+<ul>
+<li>a</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+- a
+  - b
+.
+<ul>
+<li>a
+<ul>
+<li>b</li>
+</ul>
+</li>
+</ul>
+````````````````````````````````
+
+
+This list is loose, because of the blank line between the
+two block elements in the list item:
+
+```````````````````````````````` example
+1. ```
+   foo
+   ```
+
+   bar
+.
+<ol>
+<li>
+<pre><code>foo
+</code></pre>
+<p>bar</p>
+</li>
+</ol>
+````````````````````````````````
+
+
+Here the outer list is loose, the inner list tight:
+
+```````````````````````````````` example
+* foo
+  * bar
+
+  baz
+.
+<ul>
+<li>
+<p>foo</p>
+<ul>
+<li>bar</li>
+</ul>
+<p>baz</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+- a
+  - b
+  - c
+
+- d
+  - e
+  - f
+.
+<ul>
+<li>
+<p>a</p>
+<ul>
+<li>b</li>
+<li>c</li>
+</ul>
+</li>
+<li>
+<p>d</p>
+<ul>
+<li>e</li>
+<li>f</li>
+</ul>
+</li>
+</ul>
+````````````````````````````````
+
+
+# Inlines
+
+Inlines are parsed sequentially from the beginning of the character
+stream to the end (left to right, in left-to-right languages).
+Thus, for example, in
+
+```````````````````````````````` example
+`hi`lo`
+.
+<p><code>hi</code>lo`</p>
+````````````````````````````````
+
+`hi` is parsed as code, leaving the backtick at the end as a literal
+backtick.
+
+
+
+## Code spans
+
+A [backtick string](@)
+is a string of one or more backtick characters (`` ` ``) that is neither
+preceded nor followed by a backtick.
+
+A [code span](@) begins with a backtick string and ends with
+a backtick string of equal length.  The contents of the code span are
+the characters between these two backtick strings, normalized in the
+following ways:
+
+- First, [line endings] are converted to [spaces].
+- If the resulting string both begins *and* ends with a [space]
+  character, but does not consist entirely of [space]
+  characters, a single [space] character is removed from the
+  front and back.  This allows you to include code that begins
+  or ends with backtick characters, which must be separated by
+  whitespace from the opening or closing backtick strings.
+
+This is a simple code span:
+
+```````````````````````````````` example
+`foo`
+.
+<p><code>foo</code></p>
+````````````````````````````````
+
+
+Here two backticks are used, because the code contains a backtick.
+This example also illustrates stripping of a single leading and
+trailing space:
+
+```````````````````````````````` example
+`` foo ` bar ``
+.
+<p><code>foo ` bar</code></p>
+````````````````````````````````
+
+
+This example shows the motivation for stripping leading and trailing
+spaces:
+
+```````````````````````````````` example
+` `` `
+.
+<p><code>``</code></p>
+````````````````````````````````
+
+Note that only *one* space is stripped:
+
+```````````````````````````````` example
+`  ``  `
+.
+<p><code> `` </code></p>
+````````````````````````````````
+
+The stripping only happens if the space is on both
+sides of the string:
+
+```````````````````````````````` example
+` a`
+.
+<p><code> a</code></p>
+````````````````````````````````
+
+Only [spaces], and not [unicode whitespace] in general, are
+stripped in this way:
+
+```````````````````````````````` example
+` b `
+.
+<p><code> b </code></p>
+````````````````````````````````
+
+No stripping occurs if the code span contains only spaces:
+
+```````````````````````````````` example
+` `
+`  `
+.
+<p><code> </code>
+<code>  </code></p>
+````````````````````````````````
+
+
+[Line endings] are treated like spaces:
+
+```````````````````````````````` example
+``
+foo
+bar  
+baz
+``
+.
+<p><code>foo bar   baz</code></p>
+````````````````````````````````
+
+```````````````````````````````` example
+``
+foo 
+``
+.
+<p><code>foo </code></p>
+````````````````````````````````
+
+
+Interior spaces are not collapsed:
+
+```````````````````````````````` example
+`foo   bar 
+baz`
+.
+<p><code>foo   bar  baz</code></p>
+````````````````````````````````
+
+Note that browsers will typically collapse consecutive spaces
+when rendering `<code>` elements, so it is recommended that
+the following CSS be used:
+
+    code{white-space: pre-wrap;}
+
+
+Note that backslash escapes do not work in code spans. All backslashes
+are treated literally:
+
+```````````````````````````````` example
+`foo\`bar`
+.
+<p><code>foo\</code>bar`</p>
+````````````````````````````````
+
+
+Backslash escapes are never needed, because one can always choose a
+string of *n* backtick characters as delimiters, where the code does
+not contain any strings of exactly *n* backtick characters.
+
+```````````````````````````````` example
+``foo`bar``
+.
+<p><code>foo`bar</code></p>
+````````````````````````````````
+
+```````````````````````````````` example
+` foo `` bar `
+.
+<p><code>foo `` bar</code></p>
+````````````````````````````````
+
+
+Code span backticks have higher precedence than any other inline
+constructs except HTML tags and autolinks.  Thus, for example, this is
+not parsed as emphasized text, since the second `*` is part of a code
+span:
+
+```````````````````````````````` example
+*foo`*`
+.
+<p>*foo<code>*</code></p>
+````````````````````````````````
+
+
+And this is not parsed as a link:
+
+```````````````````````````````` example
+[not a `link](/foo`)
+.
+<p>[not a <code>link](/foo</code>)</p>
+````````````````````````````````
+
+
+Code spans, HTML tags, and autolinks have the same precedence.
+Thus, this is code:
+
+```````````````````````````````` example
+`<a href="`">`
+.
+<p><code>&lt;a href=&quot;</code>&quot;&gt;`</p>
+````````````````````````````````
+
+
+But this is an HTML tag:
+
+```````````````````````````````` example
+<a href="`">`
+.
+<p><a href="`">`</p>
+````````````````````````````````
+
+
+And this is code:
+
+```````````````````````````````` example
+`<http://foo.bar.`baz>`
+.
+<p><code>&lt;http://foo.bar.</code>baz&gt;`</p>
+````````````````````````````````
+
+
+But this is an autolink:
+
+```````````````````````````````` example
+<http://foo.bar.`baz>`
+.
+<p><a href="http://foo.bar.%60baz">http://foo.bar.`baz</a>`</p>
+````````````````````````````````
+
+
+When a backtick string is not closed by a matching backtick string,
+we just have literal backticks:
+
+```````````````````````````````` example
+```foo``
+.
+<p>```foo``</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+`foo
+.
+<p>`foo</p>
+````````````````````````````````
+
+The following case also illustrates the need for opening and
+closing backtick strings to be equal in length:
+
+```````````````````````````````` example
+`foo``bar``
+.
+<p>`foo<code>bar</code></p>
+````````````````````````````````
+
+
+## Emphasis and strong emphasis
+
+John Gruber's original [Markdown syntax
+description](http://daringfireball.net/projects/markdown/syntax#em) says:
+
+> Markdown treats asterisks (`*`) and underscores (`_`) as indicators of
+> emphasis. Text wrapped with one `*` or `_` will be wrapped with an HTML
+> `<em>` tag; double `*`'s or `_`'s will be wrapped with an HTML `<strong>`
+> tag.
+
+This is enough for most users, but these rules leave much undecided,
+especially when it comes to nested emphasis.  The original
+`Markdown.pl` test suite makes it clear that triple `***` and
+`___` delimiters can be used for strong emphasis, and most
+implementations have also allowed the following patterns:
+
+``` markdown
+***strong emph***
+***strong** in emph*
+***emph* in strong**
+**in strong *emph***
+*in emph **strong***
+```
+
+The following patterns are less widely supported, but the intent
+is clear and they are useful (especially in contexts like bibliography
+entries):
+
+``` markdown
+*emph *with emph* in it*
+**strong **with strong** in it**
+```
+
+Many implementations have also restricted intraword emphasis to
+the `*` forms, to avoid unwanted emphasis in words containing
+internal underscores.  (It is best practice to put these in code
+spans, but users often do not.)
+
+``` markdown
+internal emphasis: foo*bar*baz
+no emphasis: foo_bar_baz
+```
+
+The rules given below capture all of these patterns, while allowing
+for efficient parsing strategies that do not backtrack.
+
+First, some definitions.  A [delimiter run](@) is either
+a sequence of one or more `*` characters that is not preceded or
+followed by a non-backslash-escaped `*` character, or a sequence
+of one or more `_` characters that is not preceded or followed by
+a non-backslash-escaped `_` character.
+
+A [left-flanking delimiter run](@) is
+a [delimiter run] that is (1) not followed by [Unicode whitespace],
+and either (2a) not followed by a [Unicode punctuation character], or
+(2b) followed by a [Unicode punctuation character] and
+preceded by [Unicode whitespace] or a [Unicode punctuation character].
+For purposes of this definition, the beginning and the end of
+the line count as Unicode whitespace.
+
+A [right-flanking delimiter run](@) is
+a [delimiter run] that is (1) not preceded by [Unicode whitespace],
+and either (2a) not preceded by a [Unicode punctuation character], or
+(2b) preceded by a [Unicode punctuation character] and
+followed by [Unicode whitespace] or a [Unicode punctuation character].
+For purposes of this definition, the beginning and the end of
+the line count as Unicode whitespace.
+
+Here are some examples of delimiter runs.
+
+  - left-flanking but not right-flanking:
+
+    ```
+    ***abc
+      _abc
+    **"abc"
+     _"abc"
+    ```
+
+  - right-flanking but not left-flanking:
+
+    ```
+     abc***
+     abc_
+    "abc"**
+    "abc"_
+    ```
+
+  - Both left and right-flanking:
+
+    ```
+     abc***def
+    "abc"_"def"
+    ```
+
+  - Neither left nor right-flanking:
+
+    ```
+    abc *** def
+    a _ b
+    ```
+
+(The idea of distinguishing left-flanking and right-flanking
+delimiter runs based on the character before and the character
+after comes from Roopesh Chander's
+[vfmd](http://www.vfmd.org/vfmd-spec/specification/#procedure-for-identifying-emphasis-tags).
+vfmd uses the terminology "emphasis indicator string" instead of "delimiter
+run," and its rules for distinguishing left- and right-flanking runs
+are a bit more complex than the ones given here.)
+
+The following rules define emphasis and strong emphasis:
+
+1.  A single `*` character [can open emphasis](@)
+    iff (if and only if) it is part of a [left-flanking delimiter run].
+
+2.  A single `_` character [can open emphasis] iff
+    it is part of a [left-flanking delimiter run]
+    and either (a) not part of a [right-flanking delimiter run]
+    or (b) part of a [right-flanking delimiter run]
+    preceded by a [Unicode punctuation character].
+
+3.  A single `*` character [can close emphasis](@)
+    iff it is part of a [right-flanking delimiter run].
+
+4.  A single `_` character [can close emphasis] iff
+    it is part of a [right-flanking delimiter run]
+    and either (a) not part of a [left-flanking delimiter run]
+    or (b) part of a [left-flanking delimiter run]
+    followed by a [Unicode punctuation character].
+
+5.  A double `**` [can open strong emphasis](@)
+    iff it is part of a [left-flanking delimiter run].
+
+6.  A double `__` [can open strong emphasis] iff
+    it is part of a [left-flanking delimiter run]
+    and either (a) not part of a [right-flanking delimiter run]
+    or (b) part of a [right-flanking delimiter run]
+    preceded by a [Unicode punctuation character].
+
+7.  A double `**` [can close strong emphasis](@)
+    iff it is part of a [right-flanking delimiter run].
+
+8.  A double `__` [can close strong emphasis] iff
+    it is part of a [right-flanking delimiter run]
+    and either (a) not part of a [left-flanking delimiter run]
+    or (b) part of a [left-flanking delimiter run]
+    followed by a [Unicode punctuation character].
+
+9.  Emphasis begins with a delimiter that [can open emphasis] and ends
+    with a delimiter that [can close emphasis], and that uses the same
+    character (`_` or `*`) as the opening delimiter.  The
+    opening and closing delimiters must belong to separate
+    [delimiter runs].  If one of the delimiters can both
+    open and close emphasis, then the sum of the lengths of the
+    delimiter runs containing the opening and closing delimiters
+    must not be a multiple of 3 unless both lengths are
+    multiples of 3.
+
+10. Strong emphasis begins with a delimiter that
+    [can open strong emphasis] and ends with a delimiter that
+    [can close strong emphasis], and that uses the same character
+    (`_` or `*`) as the opening delimiter.  The
+    opening and closing delimiters must belong to separate
+    [delimiter runs].  If one of the delimiters can both open
+    and close strong emphasis, then the sum of the lengths of
+    the delimiter runs containing the opening and closing
+    delimiters must not be a multiple of 3 unless both lengths
+    are multiples of 3.
+
+11. A literal `*` character cannot occur at the beginning or end of
+    `*`-delimited emphasis or `**`-delimited strong emphasis, unless it
+    is backslash-escaped.
+
+12. A literal `_` character cannot occur at the beginning or end of
+    `_`-delimited emphasis or `__`-delimited strong emphasis, unless it
+    is backslash-escaped.
+
+Where rules 1--12 above are compatible with multiple parsings,
+the following principles resolve ambiguity:
+
+13. The number of nestings should be minimized. Thus, for example,
+    an interpretation `<strong>...</strong>` is always preferred to
+    `<em><em>...</em></em>`.
+
+14. An interpretation `<em><strong>...</strong></em>` is always
+    preferred to `<strong><em>...</em></strong>`.
+
+15. When two potential emphasis or strong emphasis spans overlap,
+    so that the second begins before the first ends and ends after
+    the first ends, the first takes precedence. Thus, for example,
+    `*foo _bar* baz_` is parsed as `<em>foo _bar</em> baz_` rather
+    than `*foo <em>bar* baz</em>`.
+
+16. When there are two potential emphasis or strong emphasis spans
+    with the same closing delimiter, the shorter one (the one that
+    opens later) takes precedence. Thus, for example,
+    `**foo **bar baz**` is parsed as `**foo <strong>bar baz</strong>`
+    rather than `<strong>foo **bar baz</strong>`.
+
+17. Inline code spans, links, images, and HTML tags group more tightly
+    than emphasis.  So, when there is a choice between an interpretation
+    that contains one of these elements and one that does not, the
+    former always wins.  Thus, for example, `*[foo*](bar)` is
+    parsed as `*<a href="bar">foo*</a>` rather than as
+    `<em>[foo</em>](bar)`.
+
+These rules can be illustrated through a series of examples.
+
+Rule 1:
+
+```````````````````````````````` example
+*foo bar*
+.
+<p><em>foo bar</em></p>
+````````````````````````````````
+
+
+This is not emphasis, because the opening `*` is followed by
+whitespace, and hence not part of a [left-flanking delimiter run]:
+
+```````````````````````````````` example
+a * foo bar*
+.
+<p>a * foo bar*</p>
+````````````````````````````````
+
+
+This is not emphasis, because the opening `*` is preceded
+by an alphanumeric and followed by punctuation, and hence
+not part of a [left-flanking delimiter run]:
+
+```````````````````````````````` example
+a*"foo"*
+.
+<p>a*&quot;foo&quot;*</p>
+````````````````````````````````
+
+
+Unicode nonbreaking spaces count as whitespace, too:
+
+```````````````````````````````` example
+* a *
+.
+<p>* a *</p>
+````````````````````````````````
+
+
+Intraword emphasis with `*` is permitted:
+
+```````````````````````````````` example
+foo*bar*
+.
+<p>foo<em>bar</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+5*6*78
+.
+<p>5<em>6</em>78</p>
+````````````````````````````````
+
+
+Rule 2:
+
+```````````````````````````````` example
+_foo bar_
+.
+<p><em>foo bar</em></p>
+````````````````````````````````
+
+
+This is not emphasis, because the opening `_` is followed by
+whitespace:
+
+```````````````````````````````` example
+_ foo bar_
+.
+<p>_ foo bar_</p>
+````````````````````````````````
+
+
+This is not emphasis, because the opening `_` is preceded
+by an alphanumeric and followed by punctuation:
+
+```````````````````````````````` example
+a_"foo"_
+.
+<p>a_&quot;foo&quot;_</p>
+````````````````````````````````
+
+
+Emphasis with `_` is not allowed inside words:
+
+```````````````````````````````` example
+foo_bar_
+.
+<p>foo_bar_</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+5_6_78
+.
+<p>5_6_78</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+пристаням_стремятся_
+.
+<p>пристаням_стремятся_</p>
+````````````````````````````````
+
+
+Here `_` does not generate emphasis, because the first delimiter run
+is right-flanking and the second left-flanking:
+
+```````````````````````````````` example
+aa_"bb"_cc
+.
+<p>aa_&quot;bb&quot;_cc</p>
+````````````````````````````````
+
+
+This is emphasis, even though the opening delimiter is
+both left- and right-flanking, because it is preceded by
+punctuation:
+
+```````````````````````````````` example
+foo-_(bar)_
+.
+<p>foo-<em>(bar)</em></p>
+````````````````````````````````
+
+
+Rule 3:
+
+This is not emphasis, because the closing delimiter does
+not match the opening delimiter:
+
+```````````````````````````````` example
+_foo*
+.
+<p>_foo*</p>
+````````````````````````````````
+
+
+This is not emphasis, because the closing `*` is preceded by
+whitespace:
+
+```````````````````````````````` example
+*foo bar *
+.
+<p>*foo bar *</p>
+````````````````````````````````
+
+
+A line ending also counts as whitespace:
+
+```````````````````````````````` example
+*foo bar
+*
+.
+<p>*foo bar
+*</p>
+````````````````````````````````
+
+
+This is not emphasis, because the second `*` is
+preceded by punctuation and followed by an alphanumeric
+(hence it is not part of a [right-flanking delimiter run]:
+
+```````````````````````````````` example
+*(*foo)
+.
+<p>*(*foo)</p>
+````````````````````````````````
+
+
+The point of this restriction is more easily appreciated
+with this example:
+
+```````````````````````````````` example
+*(*foo*)*
+.
+<p><em>(<em>foo</em>)</em></p>
+````````````````````````````````
+
+
+Intraword emphasis with `*` is allowed:
+
+```````````````````````````````` example
+*foo*bar
+.
+<p><em>foo</em>bar</p>
+````````````````````````````````
+
+
+
+Rule 4:
+
+This is not emphasis, because the closing `_` is preceded by
+whitespace:
+
+```````````````````````````````` example
+_foo bar _
+.
+<p>_foo bar _</p>
+````````````````````````````````
+
+
+This is not emphasis, because the second `_` is
+preceded by punctuation and followed by an alphanumeric:
+
+```````````````````````````````` example
+_(_foo)
+.
+<p>_(_foo)</p>
+````````````````````````````````
+
+
+This is emphasis within emphasis:
+
+```````````````````````````````` example
+_(_foo_)_
+.
+<p><em>(<em>foo</em>)</em></p>
+````````````````````````````````
+
+
+Intraword emphasis is disallowed for `_`:
+
+```````````````````````````````` example
+_foo_bar
+.
+<p>_foo_bar</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_пристаням_стремятся
+.
+<p>_пристаням_стремятся</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_foo_bar_baz_
+.
+<p><em>foo_bar_baz</em></p>
+````````````````````````````````
+
+
+This is emphasis, even though the closing delimiter is
+both left- and right-flanking, because it is followed by
+punctuation:
+
+```````````````````````````````` example
+_(bar)_.
+.
+<p><em>(bar)</em>.</p>
+````````````````````````````````
+
+
+Rule 5:
+
+```````````````````````````````` example
+**foo bar**
+.
+<p><strong>foo bar</strong></p>
+````````````````````````````````
+
+
+This is not strong emphasis, because the opening delimiter is
+followed by whitespace:
+
+```````````````````````````````` example
+** foo bar**
+.
+<p>** foo bar**</p>
+````````````````````````````````
+
+
+This is not strong emphasis, because the opening `**` is preceded
+by an alphanumeric and followed by punctuation, and hence
+not part of a [left-flanking delimiter run]:
+
+```````````````````````````````` example
+a**"foo"**
+.
+<p>a**&quot;foo&quot;**</p>
+````````````````````````````````
+
+
+Intraword strong emphasis with `**` is permitted:
+
+```````````````````````````````` example
+foo**bar**
+.
+<p>foo<strong>bar</strong></p>
+````````````````````````````````
+
+
+Rule 6:
+
+```````````````````````````````` example
+__foo bar__
+.
+<p><strong>foo bar</strong></p>
+````````````````````````````````
+
+
+This is not strong emphasis, because the opening delimiter is
+followed by whitespace:
+
+```````````````````````````````` example
+__ foo bar__
+.
+<p>__ foo bar__</p>
+````````````````````````````````
+
+
+A line ending counts as whitespace:
+```````````````````````````````` example
+__
+foo bar__
+.
+<p>__
+foo bar__</p>
+````````````````````````````````
+
+
+This is not strong emphasis, because the opening `__` is preceded
+by an alphanumeric and followed by punctuation:
+
+```````````````````````````````` example
+a__"foo"__
+.
+<p>a__&quot;foo&quot;__</p>
+````````````````````````````````
+
+
+Intraword strong emphasis is forbidden with `__`:
+
+```````````````````````````````` example
+foo__bar__
+.
+<p>foo__bar__</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+5__6__78
+.
+<p>5__6__78</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+пристаням__стремятся__
+.
+<p>пристаням__стремятся__</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__foo, __bar__, baz__
+.
+<p><strong>foo, <strong>bar</strong>, baz</strong></p>
+````````````````````````````````
+
+
+This is strong emphasis, even though the opening delimiter is
+both left- and right-flanking, because it is preceded by
+punctuation:
+
+```````````````````````````````` example
+foo-__(bar)__
+.
+<p>foo-<strong>(bar)</strong></p>
+````````````````````````````````
+
+
+
+Rule 7:
+
+This is not strong emphasis, because the closing delimiter is preceded
+by whitespace:
+
+```````````````````````````````` example
+**foo bar **
+.
+<p>**foo bar **</p>
+````````````````````````````````
+
+
+(Nor can it be interpreted as an emphasized `*foo bar *`, because of
+Rule 11.)
+
+This is not strong emphasis, because the second `**` is
+preceded by punctuation and followed by an alphanumeric:
+
+```````````````````````````````` example
+**(**foo)
+.
+<p>**(**foo)</p>
+````````````````````````````````
+
+
+The point of this restriction is more easily appreciated
+with these examples:
+
+```````````````````````````````` example
+*(**foo**)*
+.
+<p><em>(<strong>foo</strong>)</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**Gomphocarpus (*Gomphocarpus physocarpus*, syn.
+*Asclepias physocarpa*)**
+.
+<p><strong>Gomphocarpus (<em>Gomphocarpus physocarpus</em>, syn.
+<em>Asclepias physocarpa</em>)</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo "*bar*" foo**
+.
+<p><strong>foo &quot;<em>bar</em>&quot; foo</strong></p>
+````````````````````````````````
+
+
+Intraword emphasis:
+
+```````````````````````````````` example
+**foo**bar
+.
+<p><strong>foo</strong>bar</p>
+````````````````````````````````
+
+
+Rule 8:
+
+This is not strong emphasis, because the closing delimiter is
+preceded by whitespace:
+
+```````````````````````````````` example
+__foo bar __
+.
+<p>__foo bar __</p>
+````````````````````````````````
+
+
+This is not strong emphasis, because the second `__` is
+preceded by punctuation and followed by an alphanumeric:
+
+```````````````````````````````` example
+__(__foo)
+.
+<p>__(__foo)</p>
+````````````````````````````````
+
+
+The point of this restriction is more easily appreciated
+with this example:
+
+```````````````````````````````` example
+_(__foo__)_
+.
+<p><em>(<strong>foo</strong>)</em></p>
+````````````````````````````````
+
+
+Intraword strong emphasis is forbidden with `__`:
+
+```````````````````````````````` example
+__foo__bar
+.
+<p>__foo__bar</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__пристаням__стремятся
+.
+<p>__пристаням__стремятся</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__foo__bar__baz__
+.
+<p><strong>foo__bar__baz</strong></p>
+````````````````````````````````
+
+
+This is strong emphasis, even though the closing delimiter is
+both left- and right-flanking, because it is followed by
+punctuation:
+
+```````````````````````````````` example
+__(bar)__.
+.
+<p><strong>(bar)</strong>.</p>
+````````````````````````````````
+
+
+Rule 9:
+
+Any nonempty sequence of inline elements can be the contents of an
+emphasized span.
+
+```````````````````````````````` example
+*foo [bar](/url)*
+.
+<p><em>foo <a href="/url">bar</a></em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo
+bar*
+.
+<p><em>foo
+bar</em></p>
+````````````````````````````````
+
+
+In particular, emphasis and strong emphasis can be nested
+inside emphasis:
+
+```````````````````````````````` example
+_foo __bar__ baz_
+.
+<p><em>foo <strong>bar</strong> baz</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_foo _bar_ baz_
+.
+<p><em>foo <em>bar</em> baz</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__foo_ bar_
+.
+<p><em><em>foo</em> bar</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo *bar**
+.
+<p><em>foo <em>bar</em></em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo **bar** baz*
+.
+<p><em>foo <strong>bar</strong> baz</em></p>
+````````````````````````````````
+
+```````````````````````````````` example
+*foo**bar**baz*
+.
+<p><em>foo<strong>bar</strong>baz</em></p>
+````````````````````````````````
+
+Note that in the preceding case, the interpretation
+
+``` markdown
+<p><em>foo</em><em>bar<em></em>baz</em></p>
+```
+
+
+is precluded by the condition that a delimiter that
+can both open and close (like the `*` after `foo`)
+cannot form emphasis if the sum of the lengths of
+the delimiter runs containing the opening and
+closing delimiters is a multiple of 3 unless
+both lengths are multiples of 3.
+
+
+For the same reason, we don't get two consecutive
+emphasis sections in this example:
+
+```````````````````````````````` example
+*foo**bar*
+.
+<p><em>foo**bar</em></p>
+````````````````````````````````
+
+
+The same condition ensures that the following
+cases are all strong emphasis nested inside
+emphasis, even when the interior whitespace is
+omitted:
+
+
+```````````````````````````````` example
+***foo** bar*
+.
+<p><em><strong>foo</strong> bar</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo **bar***
+.
+<p><em>foo <strong>bar</strong></em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo**bar***
+.
+<p><em>foo<strong>bar</strong></em></p>
+````````````````````````````````
+
+
+When the lengths of the interior closing and opening
+delimiter runs are *both* multiples of 3, though,
+they can match to create emphasis:
+
+```````````````````````````````` example
+foo***bar***baz
+.
+<p>foo<em><strong>bar</strong></em>baz</p>
+````````````````````````````````
+
+```````````````````````````````` example
+foo******bar*********baz
+.
+<p>foo<strong><strong><strong>bar</strong></strong></strong>***baz</p>
+````````````````````````````````
+
+
+Indefinite levels of nesting are possible:
+
+```````````````````````````````` example
+*foo **bar *baz* bim** bop*
+.
+<p><em>foo <strong>bar <em>baz</em> bim</strong> bop</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo [*bar*](/url)*
+.
+<p><em>foo <a href="/url"><em>bar</em></a></em></p>
+````````````````````````````````
+
+
+There can be no empty emphasis or strong emphasis:
+
+```````````````````````````````` example
+** is not an empty emphasis
+.
+<p>** is not an empty emphasis</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**** is not an empty strong emphasis
+.
+<p>**** is not an empty strong emphasis</p>
+````````````````````````````````
+
+
+
+Rule 10:
+
+Any nonempty sequence of inline elements can be the contents of an
+strongly emphasized span.
+
+```````````````````````````````` example
+**foo [bar](/url)**
+.
+<p><strong>foo <a href="/url">bar</a></strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo
+bar**
+.
+<p><strong>foo
+bar</strong></p>
+````````````````````````````````
+
+
+In particular, emphasis and strong emphasis can be nested
+inside strong emphasis:
+
+```````````````````````````````` example
+__foo _bar_ baz__
+.
+<p><strong>foo <em>bar</em> baz</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__foo __bar__ baz__
+.
+<p><strong>foo <strong>bar</strong> baz</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+____foo__ bar__
+.
+<p><strong><strong>foo</strong> bar</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo **bar****
+.
+<p><strong>foo <strong>bar</strong></strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo *bar* baz**
+.
+<p><strong>foo <em>bar</em> baz</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo*bar*baz**
+.
+<p><strong>foo<em>bar</em>baz</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+***foo* bar**
+.
+<p><strong><em>foo</em> bar</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo *bar***
+.
+<p><strong>foo <em>bar</em></strong></p>
+````````````````````````````````
+
+
+Indefinite levels of nesting are possible:
+
+```````````````````````````````` example
+**foo *bar **baz**
+bim* bop**
+.
+<p><strong>foo <em>bar <strong>baz</strong>
+bim</em> bop</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo [*bar*](/url)**
+.
+<p><strong>foo <a href="/url"><em>bar</em></a></strong></p>
+````````````````````````````````
+
+
+There can be no empty emphasis or strong emphasis:
+
+```````````````````````````````` example
+__ is not an empty emphasis
+.
+<p>__ is not an empty emphasis</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+____ is not an empty strong emphasis
+.
+<p>____ is not an empty strong emphasis</p>
+````````````````````````````````
+
+
+
+Rule 11:
+
+```````````````````````````````` example
+foo ***
+.
+<p>foo ***</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo *\**
+.
+<p>foo <em>*</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo *_*
+.
+<p>foo <em>_</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo *****
+.
+<p>foo *****</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo **\***
+.
+<p>foo <strong>*</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo **_**
+.
+<p>foo <strong>_</strong></p>
+````````````````````````````````
+
+
+Note that when delimiters do not match evenly, Rule 11 determines
+that the excess literal `*` characters will appear outside of the
+emphasis, rather than inside it:
+
+```````````````````````````````` example
+**foo*
+.
+<p>*<em>foo</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo**
+.
+<p><em>foo</em>*</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+***foo**
+.
+<p>*<strong>foo</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+****foo*
+.
+<p>***<em>foo</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo***
+.
+<p><strong>foo</strong>*</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo****
+.
+<p><em>foo</em>***</p>
+````````````````````````````````
+
+
+
+Rule 12:
+
+```````````````````````````````` example
+foo ___
+.
+<p>foo ___</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo _\__
+.
+<p>foo <em>_</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo _*_
+.
+<p>foo <em>*</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo _____
+.
+<p>foo _____</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo __\___
+.
+<p>foo <strong>_</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo __*__
+.
+<p>foo <strong>*</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__foo_
+.
+<p>_<em>foo</em></p>
+````````````````````````````````
+
+
+Note that when delimiters do not match evenly, Rule 12 determines
+that the excess literal `_` characters will appear outside of the
+emphasis, rather than inside it:
+
+```````````````````````````````` example
+_foo__
+.
+<p><em>foo</em>_</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+___foo__
+.
+<p>_<strong>foo</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+____foo_
+.
+<p>___<em>foo</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__foo___
+.
+<p><strong>foo</strong>_</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_foo____
+.
+<p><em>foo</em>___</p>
+````````````````````````````````
+
+
+Rule 13 implies that if you want emphasis nested directly inside
+emphasis, you must use different delimiters:
+
+```````````````````````````````` example
+**foo**
+.
+<p><strong>foo</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*_foo_*
+.
+<p><em><em>foo</em></em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__foo__
+.
+<p><strong>foo</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_*foo*_
+.
+<p><em><em>foo</em></em></p>
+````````````````````````````````
+
+
+However, strong emphasis within strong emphasis is possible without
+switching delimiters:
+
+```````````````````````````````` example
+****foo****
+.
+<p><strong><strong>foo</strong></strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+____foo____
+.
+<p><strong><strong>foo</strong></strong></p>
+````````````````````````````````
+
+
+
+Rule 13 can be applied to arbitrarily long sequences of
+delimiters:
+
+```````````````````````````````` example
+******foo******
+.
+<p><strong><strong><strong>foo</strong></strong></strong></p>
+````````````````````````````````
+
+
+Rule 14:
+
+```````````````````````````````` example
+***foo***
+.
+<p><em><strong>foo</strong></em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_____foo_____
+.
+<p><em><strong><strong>foo</strong></strong></em></p>
+````````````````````````````````
+
+
+Rule 15:
+
+```````````````````````````````` example
+*foo _bar* baz_
+.
+<p><em>foo _bar</em> baz_</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo __bar *baz bim__ bam*
+.
+<p><em>foo <strong>bar *baz bim</strong> bam</em></p>
+````````````````````````````````
+
+
+Rule 16:
+
+```````````````````````````````` example
+**foo **bar baz**
+.
+<p>**foo <strong>bar baz</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo *bar baz*
+.
+<p>*foo <em>bar baz</em></p>
+````````````````````````````````
+
+
+Rule 17:
+
+```````````````````````````````` example
+*[bar*](/url)
+.
+<p>*<a href="/url">bar*</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_foo [bar_](/url)
+.
+<p>_foo <a href="/url">bar_</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*<img src="foo" title="*"/>
+.
+<p>*<img src="foo" title="*"/></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**<a href="**">
+.
+<p>**<a href="**"></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__<a href="__">
+.
+<p>__<a href="__"></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*a `*`*
+.
+<p><em>a <code>*</code></em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_a `_`_
+.
+<p><em>a <code>_</code></em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**a<http://foo.bar/?q=**>
+.
+<p>**a<a href="http://foo.bar/?q=**">http://foo.bar/?q=**</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__a<http://foo.bar/?q=__>
+.
+<p>__a<a href="http://foo.bar/?q=__">http://foo.bar/?q=__</a></p>
+````````````````````````````````
+
+
+
+## Links
+
+A link contains [link text] (the visible text), a [link destination]
+(the URI that is the link destination), and optionally a [link title].
+There are two basic kinds of links in Markdown.  In [inline links] the
+destination and title are given immediately after the link text.  In
+[reference links] the destination and title are defined elsewhere in
+the document.
+
+A [link text](@) consists of a sequence of zero or more
+inline elements enclosed by square brackets (`[` and `]`).  The
+following rules apply:
+
+- Links may not contain other links, at any level of nesting. If
+  multiple otherwise valid link definitions appear nested inside each
+  other, the inner-most definition is used.
+
+- Brackets are allowed in the [link text] only if (a) they
+  are backslash-escaped or (b) they appear as a matched pair of brackets,
+  with an open bracket `[`, a sequence of zero or more inlines, and
+  a close bracket `]`.
+
+- Backtick [code spans], [autolinks], and raw [HTML tags] bind more tightly
+  than the brackets in link text.  Thus, for example,
+  `` [foo`]` `` could not be a link text, since the second `]`
+  is part of a code span.
+
+- The brackets in link text bind more tightly than markers for
+  [emphasis and strong emphasis]. Thus, for example, `*[foo*](url)` is a link.
+
+A [link destination](@) consists of either
+
+- a sequence of zero or more characters between an opening `<` and a
+  closing `>` that contains no line endings or unescaped
+  `<` or `>` characters, or
+
+- a nonempty sequence of characters that does not start with `<`,
+  does not include [ASCII control characters][ASCII control character]
+  or [space] character, and includes parentheses only if (a) they are
+  backslash-escaped or (b) they are part of a balanced pair of
+  unescaped parentheses.
+  (Implementations may impose limits on parentheses nesting to
+  avoid performance issues, but at least three levels of nesting
+  should be supported.)
+
+A [link title](@)  consists of either
+
+- a sequence of zero or more characters between straight double-quote
+  characters (`"`), including a `"` character only if it is
+  backslash-escaped, or
+
+- a sequence of zero or more characters between straight single-quote
+  characters (`'`), including a `'` character only if it is
+  backslash-escaped, or
+
+- a sequence of zero or more characters between matching parentheses
+  (`(...)`), including a `(` or `)` character only if it is
+  backslash-escaped.
+
+Although [link titles] may span multiple lines, they may not contain
+a [blank line].
+
+An [inline link](@) consists of a [link text] followed immediately
+by a left parenthesis `(`, an optional [link destination], an optional
+[link title], and a right parenthesis `)`.
+These four components may be separated by spaces, tabs, and up to one line
+ending.
+If both [link destination] and [link title] are present, they *must* be
+separated by spaces, tabs, and up to one line ending.
+
+The link's text consists of the inlines contained
+in the [link text] (excluding the enclosing square brackets).
+The link's URI consists of the link destination, excluding enclosing
+`<...>` if present, with backslash-escapes in effect as described
+above.  The link's title consists of the link title, excluding its
+enclosing delimiters, with backslash-escapes in effect as described
+above.
+
+Here is a simple inline link:
+
+```````````````````````````````` example
+[link](/uri "title")
+.
+<p><a href="/uri" title="title">link</a></p>
+````````````````````````````````
+
+
+The title, the link text and even 
+the destination may be omitted:
+
+```````````````````````````````` example
+[link](/uri)
+.
+<p><a href="/uri">link</a></p>
+````````````````````````````````
+
+```````````````````````````````` example
+[](./target.md)
+.
+<p><a href="./target.md"></a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[link]()
+.
+<p><a href="">link</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[link](<>)
+.
+<p><a href="">link</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[]()
+.
+<p><a href=""></a></p>
+````````````````````````````````
+
+The destination can only contain spaces if it is
+enclosed in pointy brackets:
+
+```````````````````````````````` example
+[link](/my uri)
+.
+<p>[link](/my uri)</p>
+````````````````````````````````
+
+```````````````````````````````` example
+[link](</my uri>)
+.
+<p><a href="/my%20uri">link</a></p>
+````````````````````````````````
+
+The destination cannot contain line endings,
+even if enclosed in pointy brackets:
+
+```````````````````````````````` example
+[link](foo
+bar)
+.
+<p>[link](foo
+bar)</p>
+````````````````````````````````
+
+```````````````````````````````` example
+[link](<foo
+bar>)
+.
+<p>[link](<foo
+bar>)</p>
+````````````````````````````````
+
+The destination can contain `)` if it is enclosed
+in pointy brackets:
+
+```````````````````````````````` example
+[a](<b)c>)
+.
+<p><a href="b)c">a</a></p>
+````````````````````````````````
+
+Pointy brackets that enclose links must be unescaped:
+
+```````````````````````````````` example
+[link](<foo\>)
+.
+<p>[link](&lt;foo&gt;)</p>
+````````````````````````````````
+
+These are not links, because the opening pointy bracket
+is not matched properly:
+
+```````````````````````````````` example
+[a](<b)c
+[a](<b)c>
+[a](<b>c)
+.
+<p>[a](&lt;b)c
+[a](&lt;b)c&gt;
+[a](<b>c)</p>
+````````````````````````````````
+
+Parentheses inside the link destination may be escaped:
+
+```````````````````````````````` example
+[link](\(foo\))
+.
+<p><a href="(foo)">link</a></p>
+````````````````````````````````
+
+Any number of parentheses are allowed without escaping, as long as they are
+balanced:
+
+```````````````````````````````` example
+[link](foo(and(bar)))
+.
+<p><a href="foo(and(bar))">link</a></p>
+````````````````````````````````
+
+However, if you have unbalanced parentheses, you need to escape or use the
+`<...>` form:
+
+```````````````````````````````` example
+[link](foo(and(bar))
+.
+<p>[link](foo(and(bar))</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[link](foo\(and\(bar\))
+.
+<p><a href="foo(and(bar)">link</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[link](<foo(and(bar)>)
+.
+<p><a href="foo(and(bar)">link</a></p>
+````````````````````````````````
+
+
+Parentheses and other symbols can also be escaped, as usual
+in Markdown:
+
+```````````````````````````````` example
+[link](foo\)\:)
+.
+<p><a href="foo):">link</a></p>
+````````````````````````````````
+
+
+A link can contain fragment identifiers and queries:
+
+```````````````````````````````` example
+[link](#fragment)
+
+[link](http://example.com#fragment)
+
+[link](http://example.com?foo=3#frag)
+.
+<p><a href="#fragment">link</a></p>
+<p><a href="http://example.com#fragment">link</a></p>
+<p><a href="http://example.com?foo=3#frag">link</a></p>
+````````````````````````````````
+
+
+Note that a backslash before a non-escapable character is
+just a backslash:
+
+```````````````````````````````` example
+[link](foo\bar)
+.
+<p><a href="foo%5Cbar">link</a></p>
+````````````````````````````````
+
+
+URL-escaping should be left alone inside the destination, as all
+URL-escaped characters are also valid URL characters. Entity and
+numerical character references in the destination will be parsed
+into the corresponding Unicode code points, as usual.  These may
+be optionally URL-escaped when written as HTML, but this spec
+does not enforce any particular policy for rendering URLs in
+HTML or other formats.  Renderers may make different decisions
+about how to escape or normalize URLs in the output.
+
+```````````````````````````````` example
+[link](foo%20b&auml;)
+.
+<p><a href="foo%20b%C3%A4">link</a></p>
+````````````````````````````````
+
+
+Note that, because titles can often be parsed as destinations,
+if you try to omit the destination and keep the title, you'll
+get unexpected results:
+
+```````````````````````````````` example
+[link]("title")
+.
+<p><a href="%22title%22">link</a></p>
+````````````````````````````````
+
+
+Titles may be in single quotes, double quotes, or parentheses:
+
+```````````````````````````````` example
+[link](/url "title")
+[link](/url 'title')
+[link](/url (title))
+.
+<p><a href="/url" title="title">link</a>
+<a href="/url" title="title">link</a>
+<a href="/url" title="title">link</a></p>
+````````````````````````````````
+
+
+Backslash escapes and entity and numeric character references
+may be used in titles:
+
+```````````````````````````````` example
+[link](/url "title \"&quot;")
+.
+<p><a href="/url" title="title &quot;&quot;">link</a></p>
+````````````````````````````````
+
+
+Titles must be separated from the link using spaces, tabs, and up to one line
+ending.
+Other [Unicode whitespace] like non-breaking space doesn't work.
+
+```````````````````````````````` example
+[link](/url "title")
+.
+<p><a href="/url%C2%A0%22title%22">link</a></p>
+````````````````````````````````
+
+
+Nested balanced quotes are not allowed without escaping:
+
+```````````````````````````````` example
+[link](/url "title "and" title")
+.
+<p>[link](/url &quot;title &quot;and&quot; title&quot;)</p>
+````````````````````````````````
+
+
+But it is easy to work around this by using a different quote type:
+
+```````````````````````````````` example
+[link](/url 'title "and" title')
+.
+<p><a href="/url" title="title &quot;and&quot; title">link</a></p>
+````````````````````````````````
+
+
+(Note:  `Markdown.pl` did allow double quotes inside a double-quoted
+title, and its test suite included a test demonstrating this.
+But it is hard to see a good rationale for the extra complexity this
+brings, since there are already many ways---backslash escaping,
+entity and numeric character references, or using a different
+quote type for the enclosing title---to write titles containing
+double quotes.  `Markdown.pl`'s handling of titles has a number
+of other strange features.  For example, it allows single-quoted
+titles in inline links, but not reference links.  And, in
+reference links but not inline links, it allows a title to begin
+with `"` and end with `)`.  `Markdown.pl` 1.0.1 even allows
+titles with no closing quotation mark, though 1.0.2b8 does not.
+It seems preferable to adopt a simple, rational rule that works
+the same way in inline links and link reference definitions.)
+
+Spaces, tabs, and up to one line ending is allowed around the destination and
+title:
+
+```````````````````````````````` example
+[link](   /uri
+  "title"  )
+.
+<p><a href="/uri" title="title">link</a></p>
+````````````````````````````````
+
+
+But it is not allowed between the link text and the
+following parenthesis:
+
+```````````````````````````````` example
+[link] (/uri)
+.
+<p>[link] (/uri)</p>
+````````````````````````````````
+
+
+The link text may contain balanced brackets, but not unbalanced ones,
+unless they are escaped:
+
+```````````````````````````````` example
+[link [foo [bar]]](/uri)
+.
+<p><a href="/uri">link [foo [bar]]</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[link] bar](/uri)
+.
+<p>[link] bar](/uri)</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[link [bar](/uri)
+.
+<p>[link <a href="/uri">bar</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[link \[bar](/uri)
+.
+<p><a href="/uri">link [bar</a></p>
+````````````````````````````````
+
+
+The link text may contain inline content:
+
+```````````````````````````````` example
+[link *foo **bar** `#`*](/uri)
+.
+<p><a href="/uri">link <em>foo <strong>bar</strong> <code>#</code></em></a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[![moon](moon.jpg)](/uri)
+.
+<p><a href="/uri"><img src="moon.jpg" alt="moon" /></a></p>
+````````````````````````````````
+
+
+However, links may not contain other links, at any level of nesting.
+
+```````````````````````````````` example
+[foo [bar](/uri)](/uri)
+.
+<p>[foo <a href="/uri">bar</a>](/uri)</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo *[bar [baz](/uri)](/uri)*](/uri)
+.
+<p>[foo <em>[bar <a href="/uri">baz</a>](/uri)</em>](/uri)</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![[[foo](uri1)](uri2)](uri3)
+.
+<p><img src="uri3" alt="[foo](uri2)" /></p>
+````````````````````````````````
+
+
+These cases illustrate the precedence of link text grouping over
+emphasis grouping:
+
+```````````````````````````````` example
+*[foo*](/uri)
+.
+<p>*<a href="/uri">foo*</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo *bar](baz*)
+.
+<p><a href="baz*">foo *bar</a></p>
+````````````````````````````````
+
+
+Note that brackets that *aren't* part of links do not take
+precedence:
+
+```````````````````````````````` example
+*foo [bar* baz]
+.
+<p><em>foo [bar</em> baz]</p>
+````````````````````````````````
+
+
+These cases illustrate the precedence of HTML tags, code spans,
+and autolinks over link grouping:
+
+```````````````````````````````` example
+[foo <bar attr="](baz)">
+.
+<p>[foo <bar attr="](baz)"></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo`](/uri)`
+.
+<p>[foo<code>](/uri)</code></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo<http://example.com/?search=](uri)>
+.
+<p>[foo<a href="http://example.com/?search=%5D(uri)">http://example.com/?search=](uri)</a></p>
+````````````````````````````````
+
+
+There are three kinds of [reference link](@)s:
+[full](#full-reference-link), [collapsed](#collapsed-reference-link),
+and [shortcut](#shortcut-reference-link).
+
+A [full reference link](@)
+consists of a [link text] immediately followed by a [link label]
+that [matches] a [link reference definition] elsewhere in the document.
+
+A [link label](@)  begins with a left bracket (`[`) and ends
+with the first right bracket (`]`) that is not backslash-escaped.
+Between these brackets there must be at least one character that is not a space,
+tab, or line ending.
+Unescaped square bracket characters are not allowed inside the
+opening and closing square brackets of [link labels].  A link
+label can have at most 999 characters inside the square
+brackets.
+
+One label [matches](@)
+another just in case their normalized forms are equal.  To normalize a
+label, strip off the opening and closing brackets,
+perform the *Unicode case fold*, strip leading and trailing
+spaces, tabs, and line endings, and collapse consecutive internal
+spaces, tabs, and line endings to a single space.  If there are multiple
+matching reference link definitions, the one that comes first in the
+document is used.  (It is desirable in such cases to emit a warning.)
+
+The link's URI and title are provided by the matching [link
+reference definition].
+
+Here is a simple example:
+
+```````````````````````````````` example
+[foo][bar]
+
+[bar]: /url "title"
+.
+<p><a href="/url" title="title">foo</a></p>
+````````````````````````````````
+
+
+The rules for the [link text] are the same as with
+[inline links].  Thus:
+
+The link text may contain balanced brackets, but not unbalanced ones,
+unless they are escaped:
+
+```````````````````````````````` example
+[link [foo [bar]]][ref]
+
+[ref]: /uri
+.
+<p><a href="/uri">link [foo [bar]]</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[link \[bar][ref]
+
+[ref]: /uri
+.
+<p><a href="/uri">link [bar</a></p>
+````````````````````````````````
+
+
+The link text may contain inline content:
+
+```````````````````````````````` example
+[link *foo **bar** `#`*][ref]
+
+[ref]: /uri
+.
+<p><a href="/uri">link <em>foo <strong>bar</strong> <code>#</code></em></a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[![moon](moon.jpg)][ref]
+
+[ref]: /uri
+.
+<p><a href="/uri"><img src="moon.jpg" alt="moon" /></a></p>
+````````````````````````````````
+
+
+However, links may not contain other links, at any level of nesting.
+
+```````````````````````````````` example
+[foo [bar](/uri)][ref]
+
+[ref]: /uri
+.
+<p>[foo <a href="/uri">bar</a>]<a href="/uri">ref</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo *bar [baz][ref]*][ref]
+
+[ref]: /uri
+.
+<p>[foo <em>bar <a href="/uri">baz</a></em>]<a href="/uri">ref</a></p>
+````````````````````````````````
+
+
+(In the examples above, we have two [shortcut reference links]
+instead of one [full reference link].)
+
+The following cases illustrate the precedence of link text grouping over
+emphasis grouping:
+
+```````````````````````````````` example
+*[foo*][ref]
+
+[ref]: /uri
+.
+<p>*<a href="/uri">foo*</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo *bar][ref]*
+
+[ref]: /uri
+.
+<p><a href="/uri">foo *bar</a>*</p>
+````````````````````````````````
+
+
+These cases illustrate the precedence of HTML tags, code spans,
+and autolinks over link grouping:
+
+```````````````````````````````` example
+[foo <bar attr="][ref]">
+
+[ref]: /uri
+.
+<p>[foo <bar attr="][ref]"></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo`][ref]`
+
+[ref]: /uri
+.
+<p>[foo<code>][ref]</code></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo<http://example.com/?search=][ref]>
+
+[ref]: /uri
+.
+<p>[foo<a href="http://example.com/?search=%5D%5Bref%5D">http://example.com/?search=][ref]</a></p>
+````````````````````````````````
+
+
+Matching is case-insensitive:
+
+```````````````````````````````` example
+[foo][BaR]
+
+[bar]: /url "title"
+.
+<p><a href="/url" title="title">foo</a></p>
+````````````````````````````````
+
+
+Unicode case fold is used:
+
+```````````````````````````````` example
+[ẞ]
+
+[SS]: /url
+.
+<p><a href="/url">ẞ</a></p>
+````````````````````````````````
+
+
+Consecutive internal spaces, tabs, and line endings are treated as one space for
+purposes of determining matching:
+
+```````````````````````````````` example
+[Foo
+  bar]: /url
+
+[Baz][Foo bar]
+.
+<p><a href="/url">Baz</a></p>
+````````````````````````````````
+
+
+No spaces, tabs, or line endings are allowed between the [link text] and the
+[link label]:
+
+```````````````````````````````` example
+[foo] [bar]
+
+[bar]: /url "title"
+.
+<p>[foo] <a href="/url" title="title">bar</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo]
+[bar]
+
+[bar]: /url "title"
+.
+<p>[foo]
+<a href="/url" title="title">bar</a></p>
+````````````````````````````````
+
+
+This is a departure from John Gruber's original Markdown syntax
+description, which explicitly allows whitespace between the link
+text and the link label.  It brings reference links in line with
+[inline links], which (according to both original Markdown and
+this spec) cannot have whitespace after the link text.  More
+importantly, it prevents inadvertent capture of consecutive
+[shortcut reference links]. If whitespace is allowed between the
+link text and the link label, then in the following we will have
+a single reference link, not two shortcut reference links, as
+intended:
+
+``` markdown
+[foo]
+[bar]
+
+[foo]: /url1
+[bar]: /url2
+```
+
+(Note that [shortcut reference links] were introduced by Gruber
+himself in a beta version of `Markdown.pl`, but never included
+in the official syntax description.  Without shortcut reference
+links, it is harmless to allow space between the link text and
+link label; but once shortcut references are introduced, it is
+too dangerous to allow this, as it frequently leads to
+unintended results.)
+
+When there are multiple matching [link reference definitions],
+the first is used:
+
+```````````````````````````````` example
+[foo]: /url1
+
+[foo]: /url2
+
+[bar][foo]
+.
+<p><a href="/url1">bar</a></p>
+````````````````````````````````
+
+
+Note that matching is performed on normalized strings, not parsed
+inline content.  So the following does not match, even though the
+labels define equivalent inline content:
+
+```````````````````````````````` example
+[bar][foo\!]
+
+[foo!]: /url
+.
+<p>[bar][foo!]</p>
+````````````````````````````````
+
+
+[Link labels] cannot contain brackets, unless they are
+backslash-escaped:
+
+```````````````````````````````` example
+[foo][ref[]
+
+[ref[]: /uri
+.
+<p>[foo][ref[]</p>
+<p>[ref[]: /uri</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo][ref[bar]]
+
+[ref[bar]]: /uri
+.
+<p>[foo][ref[bar]]</p>
+<p>[ref[bar]]: /uri</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[[[foo]]]
+
+[[[foo]]]: /url
+.
+<p>[[[foo]]]</p>
+<p>[[[foo]]]: /url</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo][ref\[]
+
+[ref\[]: /uri
+.
+<p><a href="/uri">foo</a></p>
+````````````````````````````````
+
+
+Note that in this example `]` is not backslash-escaped:
+
+```````````````````````````````` example
+[bar\\]: /uri
+
+[bar\\]
+.
+<p><a href="/uri">bar\</a></p>
+````````````````````````````````
+
+
+A [link label] must contain at least one character that is not a space, tab, or
+line ending:
+
+```````````````````````````````` example
+[]
+
+[]: /uri
+.
+<p>[]</p>
+<p>[]: /uri</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[
+ ]
+
+[
+ ]: /uri
+.
+<p>[
+]</p>
+<p>[
+]: /uri</p>
+````````````````````````````````
+
+
+A [collapsed reference link](@)
+consists of a [link label] that [matches] a
+[link reference definition] elsewhere in the
+document, followed by the string `[]`.
+The contents of the first link label are parsed as inlines,
+which are used as the link's text.  The link's URI and title are
+provided by the matching reference link definition.  Thus,
+`[foo][]` is equivalent to `[foo][foo]`.
+
+```````````````````````````````` example
+[foo][]
+
+[foo]: /url "title"
+.
+<p><a href="/url" title="title">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[*foo* bar][]
+
+[*foo* bar]: /url "title"
+.
+<p><a href="/url" title="title"><em>foo</em> bar</a></p>
+````````````````````````````````
+
+
+The link labels are case-insensitive:
+
+```````````````````````````````` example
+[Foo][]
+
+[foo]: /url "title"
+.
+<p><a href="/url" title="title">Foo</a></p>
+````````````````````````````````
+
+
+
+As with full reference links, spaces, tabs, or line endings are not
+allowed between the two sets of brackets:
+
+```````````````````````````````` example
+[foo] 
+[]
+
+[foo]: /url "title"
+.
+<p><a href="/url" title="title">foo</a>
+[]</p>
+````````````````````````````````
+
+
+A [shortcut reference link](@)
+consists of a [link label] that [matches] a
+[link reference definition] elsewhere in the
+document and is not followed by `[]` or a link label.
+The contents of the first link label are parsed as inlines,
+which are used as the link's text.  The link's URI and title
+are provided by the matching link reference definition.
+Thus, `[foo]` is equivalent to `[foo][]`.
+
+```````````````````````````````` example
+[foo]
+
+[foo]: /url "title"
+.
+<p><a href="/url" title="title">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[*foo* bar]
+
+[*foo* bar]: /url "title"
+.
+<p><a href="/url" title="title"><em>foo</em> bar</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[[*foo* bar]]
+
+[*foo* bar]: /url "title"
+.
+<p>[<a href="/url" title="title"><em>foo</em> bar</a>]</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[[bar [foo]
+
+[foo]: /url
+.
+<p>[[bar <a href="/url">foo</a></p>
+````````````````````````````````
+
+
+The link labels are case-insensitive:
+
+```````````````````````````````` example
+[Foo]
+
+[foo]: /url "title"
+.
+<p><a href="/url" title="title">Foo</a></p>
+````````````````````````````````
+
+
+A space after the link text should be preserved:
+
+```````````````````````````````` example
+[foo] bar
+
+[foo]: /url
+.
+<p><a href="/url">foo</a> bar</p>
+````````````````````````````````
+
+
+If you just want bracketed text, you can backslash-escape the
+opening bracket to avoid links:
+
+```````````````````````````````` example
+\[foo]
+
+[foo]: /url "title"
+.
+<p>[foo]</p>
+````````````````````````````````
+
+
+Note that this is a link, because a link label ends with the first
+following closing bracket:
+
+```````````````````````````````` example
+[foo*]: /url
+
+*[foo*]
+.
+<p>*<a href="/url">foo*</a></p>
+````````````````````````````````
+
+
+Full and compact references take precedence over shortcut
+references:
+
+```````````````````````````````` example
+[foo][bar]
+
+[foo]: /url1
+[bar]: /url2
+.
+<p><a href="/url2">foo</a></p>
+````````````````````````````````
+
+```````````````````````````````` example
+[foo][]
+
+[foo]: /url1
+.
+<p><a href="/url1">foo</a></p>
+````````````````````````````````
+
+Inline links also take precedence:
+
+```````````````````````````````` example
+[foo]()
+
+[foo]: /url1
+.
+<p><a href="">foo</a></p>
+````````````````````````````````
+
+```````````````````````````````` example
+[foo](not a link)
+
+[foo]: /url1
+.
+<p><a href="/url1">foo</a>(not a link)</p>
+````````````````````````````````
+
+In the following case `[bar][baz]` is parsed as a reference,
+`[foo]` as normal text:
+
+```````````````````````````````` example
+[foo][bar][baz]
+
+[baz]: /url
+.
+<p>[foo]<a href="/url">bar</a></p>
+````````````````````````````````
+
+
+Here, though, `[foo][bar]` is parsed as a reference, since
+`[bar]` is defined:
+
+```````````````````````````````` example
+[foo][bar][baz]
+
+[baz]: /url1
+[bar]: /url2
+.
+<p><a href="/url2">foo</a><a href="/url1">baz</a></p>
+````````````````````````````````
+
+
+Here `[foo]` is not parsed as a shortcut reference, because it
+is followed by a link label (even though `[bar]` is not defined):
+
+```````````````````````````````` example
+[foo][bar][baz]
+
+[baz]: /url1
+[foo]: /url2
+.
+<p>[foo]<a href="/url1">bar</a></p>
+````````````````````````````````
+
+
+
+## Images
+
+Syntax for images is like the syntax for links, with one
+difference. Instead of [link text], we have an
+[image description](@).  The rules for this are the
+same as for [link text], except that (a) an
+image description starts with `![` rather than `[`, and
+(b) an image description may contain links.
+An image description has inline elements
+as its contents.  When an image is rendered to HTML,
+this is standardly used as the image's `alt` attribute.
+
+```````````````````````````````` example
+![foo](/url "title")
+.
+<p><img src="/url" alt="foo" title="title" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![foo *bar*]
+
+[foo *bar*]: train.jpg "train & tracks"
+.
+<p><img src="train.jpg" alt="foo bar" title="train &amp; tracks" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![foo ![bar](/url)](/url2)
+.
+<p><img src="/url2" alt="foo bar" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![foo [bar](/url)](/url2)
+.
+<p><img src="/url2" alt="foo bar" /></p>
+````````````````````````````````
+
+
+Though this spec is concerned with parsing, not rendering, it is
+recommended that in rendering to HTML, only the plain string content
+of the [image description] be used.  Note that in
+the above example, the alt attribute's value is `foo bar`, not `foo
+[bar](/url)` or `foo <a href="/url">bar</a>`.  Only the plain string
+content is rendered, without formatting.
+
+```````````````````````````````` example
+![foo *bar*][]
+
+[foo *bar*]: train.jpg "train & tracks"
+.
+<p><img src="train.jpg" alt="foo bar" title="train &amp; tracks" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![foo *bar*][foobar]
+
+[FOOBAR]: train.jpg "train & tracks"
+.
+<p><img src="train.jpg" alt="foo bar" title="train &amp; tracks" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![foo](train.jpg)
+.
+<p><img src="train.jpg" alt="foo" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+My ![foo bar](/path/to/train.jpg  "title"   )
+.
+<p>My <img src="/path/to/train.jpg" alt="foo bar" title="title" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![foo](<url>)
+.
+<p><img src="url" alt="foo" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![](/url)
+.
+<p><img src="/url" alt="" /></p>
+````````````````````````````````
+
+
+Reference-style:
+
+```````````````````````````````` example
+![foo][bar]
+
+[bar]: /url
+.
+<p><img src="/url" alt="foo" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![foo][bar]
+
+[BAR]: /url
+.
+<p><img src="/url" alt="foo" /></p>
+````````````````````````````````
+
+
+Collapsed:
+
+```````````````````````````````` example
+![foo][]
+
+[foo]: /url "title"
+.
+<p><img src="/url" alt="foo" title="title" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![*foo* bar][]
+
+[*foo* bar]: /url "title"
+.
+<p><img src="/url" alt="foo bar" title="title" /></p>
+````````````````````````````````
+
+
+The labels are case-insensitive:
+
+```````````````````````````````` example
+![Foo][]
+
+[foo]: /url "title"
+.
+<p><img src="/url" alt="Foo" title="title" /></p>
+````````````````````````````````
+
+
+As with reference links, spaces, tabs, and line endings, are not allowed
+between the two sets of brackets:
+
+```````````````````````````````` example
+![foo] 
+[]
+
+[foo]: /url "title"
+.
+<p><img src="/url" alt="foo" title="title" />
+[]</p>
+````````````````````````````````
+
+
+Shortcut:
+
+```````````````````````````````` example
+![foo]
+
+[foo]: /url "title"
+.
+<p><img src="/url" alt="foo" title="title" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![*foo* bar]
+
+[*foo* bar]: /url "title"
+.
+<p><img src="/url" alt="foo bar" title="title" /></p>
+````````````````````````````````
+
+
+Note that link labels cannot contain unescaped brackets:
+
+```````````````````````````````` example
+![[foo]]
+
+[[foo]]: /url "title"
+.
+<p>![[foo]]</p>
+<p>[[foo]]: /url &quot;title&quot;</p>
+````````````````````````````````
+
+
+The link labels are case-insensitive:
+
+```````````````````````````````` example
+![Foo]
+
+[foo]: /url "title"
+.
+<p><img src="/url" alt="Foo" title="title" /></p>
+````````````````````````````````
+
+
+If you just want a literal `!` followed by bracketed text, you can
+backslash-escape the opening `[`:
+
+```````````````````````````````` example
+!\[foo]
+
+[foo]: /url "title"
+.
+<p>![foo]</p>
+````````````````````````````````
+
+
+If you want a link after a literal `!`, backslash-escape the
+`!`:
+
+```````````````````````````````` example
+\![foo]
+
+[foo]: /url "title"
+.
+<p>!<a href="/url" title="title">foo</a></p>
+````````````````````````````````
+
+
+## Autolinks
+
+[Autolink](@)s are absolute URIs and email addresses inside
+`<` and `>`. They are parsed as links, with the URL or email address
+as the link label.
+
+A [URI autolink](@) consists of `<`, followed by an
+[absolute URI] followed by `>`.  It is parsed as
+a link to the URI, with the URI as the link's label.
+
+An [absolute URI](@),
+for these purposes, consists of a [scheme] followed by a colon (`:`)
+followed by zero or more characters other [ASCII control
+characters][ASCII control character], [space], `<`, and `>`.
+If the URI includes these characters, they must be percent-encoded
+(e.g. `%20` for a space).
+
+For purposes of this spec, a [scheme](@) is any sequence
+of 2--32 characters beginning with an ASCII letter and followed
+by any combination of ASCII letters, digits, or the symbols plus
+("+"), period ("."), or hyphen ("-").
+
+Here are some valid autolinks:
+
+```````````````````````````````` example
+<http://foo.bar.baz>
+.
+<p><a href="http://foo.bar.baz">http://foo.bar.baz</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<http://foo.bar.baz/test?q=hello&id=22&boolean>
+.
+<p><a href="http://foo.bar.baz/test?q=hello&amp;id=22&amp;boolean">http://foo.bar.baz/test?q=hello&amp;id=22&amp;boolean</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<irc://foo.bar:2233/baz>
+.
+<p><a href="irc://foo.bar:2233/baz">irc://foo.bar:2233/baz</a></p>
+````````````````````````````````
+
+
+Uppercase is also fine:
+
+```````````````````````````````` example
+<MAILTO:FOO@BAR.BAZ>
+.
+<p><a href="MAILTO:FOO@BAR.BAZ">MAILTO:FOO@BAR.BAZ</a></p>
+````````````````````````````````
+
+
+Note that many strings that count as [absolute URIs] for
+purposes of this spec are not valid URIs, because their
+schemes are not registered or because of other problems
+with their syntax:
+
+```````````````````````````````` example
+<a+b+c:d>
+.
+<p><a href="a+b+c:d">a+b+c:d</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<made-up-scheme://foo,bar>
+.
+<p><a href="made-up-scheme://foo,bar">made-up-scheme://foo,bar</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<http://../>
+.
+<p><a href="http://../">http://../</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<localhost:5001/foo>
+.
+<p><a href="localhost:5001/foo">localhost:5001/foo</a></p>
+````````````````````````````````
+
+
+Spaces are not allowed in autolinks:
+
+```````````````````````````````` example
+<http://foo.bar/baz bim>
+.
+<p>&lt;http://foo.bar/baz bim&gt;</p>
+````````````````````````````````
+
+
+Backslash-escapes do not work inside autolinks:
+
+```````````````````````````````` example
+<http://example.com/\[\>
+.
+<p><a href="http://example.com/%5C%5B%5C">http://example.com/\[\</a></p>
+````````````````````````````````
+
+
+An [email autolink](@)
+consists of `<`, followed by an [email address],
+followed by `>`.  The link's label is the email address,
+and the URL is `mailto:` followed by the email address.
+
+An [email address](@),
+for these purposes, is anything that matches
+the [non-normative regex from the HTML5
+spec](https://html.spec.whatwg.org/multipage/forms.html#e-mail-state-(type=email)):
+
+    /^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?
+    (?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/
+
+Examples of email autolinks:
+
+```````````````````````````````` example
+<foo@bar.example.com>
+.
+<p><a href="mailto:foo@bar.example.com">foo@bar.example.com</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<foo+special@Bar.baz-bar0.com>
+.
+<p><a href="mailto:foo+special@Bar.baz-bar0.com">foo+special@Bar.baz-bar0.com</a></p>
+````````````````````````````````
+
+
+Backslash-escapes do not work inside email autolinks:
+
+```````````````````````````````` example
+<foo\+@bar.example.com>
+.
+<p>&lt;foo+@bar.example.com&gt;</p>
+````````````````````````````````
+
+
+These are not autolinks:
+
+```````````````````````````````` example
+<>
+.
+<p>&lt;&gt;</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+< http://foo.bar >
+.
+<p>&lt; http://foo.bar &gt;</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<m:abc>
+.
+<p>&lt;m:abc&gt;</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<foo.bar.baz>
+.
+<p>&lt;foo.bar.baz&gt;</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+http://example.com
+.
+<p>http://example.com</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo@bar.example.com
+.
+<p>foo@bar.example.com</p>
+````````````````````````````````
+
+
+## Raw HTML
+
+Text between `<` and `>` that looks like an HTML tag is parsed as a
+raw HTML tag and will be rendered in HTML without escaping.
+Tag and attribute names are not limited to current HTML tags,
+so custom tags (and even, say, DocBook tags) may be used.
+
+Here is the grammar for tags:
+
+A [tag name](@) consists of an ASCII letter
+followed by zero or more ASCII letters, digits, or
+hyphens (`-`).
+
+An [attribute](@) consists of spaces, tabs, and up to one line ending,
+an [attribute name], and an optional
+[attribute value specification].
+
+An [attribute name](@)
+consists of an ASCII letter, `_`, or `:`, followed by zero or more ASCII
+letters, digits, `_`, `.`, `:`, or `-`.  (Note:  This is the XML
+specification restricted to ASCII.  HTML5 is laxer.)
+
+An [attribute value specification](@)
+consists of optional spaces, tabs, and up to one line ending,
+a `=` character, optional spaces, tabs, and up to one line ending,
+and an [attribute value].
+
+An [attribute value](@)
+consists of an [unquoted attribute value],
+a [single-quoted attribute value], or a [double-quoted attribute value].
+
+An [unquoted attribute value](@)
+is a nonempty string of characters not
+including spaces, tabs, line endings, `"`, `'`, `=`, `<`, `>`, or `` ` ``.
+
+A [single-quoted attribute value](@)
+consists of `'`, zero or more
+characters not including `'`, and a final `'`.
+
+A [double-quoted attribute value](@)
+consists of `"`, zero or more
+characters not including `"`, and a final `"`.
+
+An [open tag](@) consists of a `<` character, a [tag name],
+zero or more [attributes], optional spaces, tabs, and up to one line ending,
+an optional `/` character, and a `>` character.
+
+A [closing tag](@) consists of the string `</`, a
+[tag name], optional spaces, tabs, and up to one line ending, and the character
+`>`.
+
+An [HTML comment](@) consists of `<!--` + *text* + `-->`,
+where *text* does not start with `>` or `->`, does not end with `-`,
+and does not contain `--`.  (See the
+[HTML5 spec](http://www.w3.org/TR/html5/syntax.html#comments).)
+
+A [processing instruction](@)
+consists of the string `<?`, a string
+of characters not including the string `?>`, and the string
+`?>`.
+
+A [declaration](@) consists of the string `<!`, an ASCII letter, zero or more
+characters not including the character `>`, and the character `>`.
+
+A [CDATA section](@) consists of
+the string `<![CDATA[`, a string of characters not including the string
+`]]>`, and the string `]]>`.
+
+An [HTML tag](@) consists of an [open tag], a [closing tag],
+an [HTML comment], a [processing instruction], a [declaration],
+or a [CDATA section].
+
+Here are some simple open tags:
+
+```````````````````````````````` example
+<a><bab><c2c>
+.
+<p><a><bab><c2c></p>
+````````````````````````````````
+
+
+Empty elements:
+
+```````````````````````````````` example
+<a/><b2/>
+.
+<p><a/><b2/></p>
+````````````````````````````````
+
+
+Whitespace is allowed:
+
+```````````````````````````````` example
+<a  /><b2
+data="foo" >
+.
+<p><a  /><b2
+data="foo" ></p>
+````````````````````````````````
+
+
+With attributes:
+
+```````````````````````````````` example
+<a foo="bar" bam = 'baz <em>"</em>'
+_boolean zoop:33=zoop:33 />
+.
+<p><a foo="bar" bam = 'baz <em>"</em>'
+_boolean zoop:33=zoop:33 /></p>
+````````````````````````````````
+
+
+Custom tag names can be used:
+
+```````````````````````````````` example
+Foo <responsive-image src="foo.jpg" />
+.
+<p>Foo <responsive-image src="foo.jpg" /></p>
+````````````````````````````````
+
+
+Illegal tag names, not parsed as HTML:
+
+```````````````````````````````` example
+<33> <__>
+.
+<p>&lt;33&gt; &lt;__&gt;</p>
+````````````````````````````````
+
+
+Illegal attribute names:
+
+```````````````````````````````` example
+<a h*#ref="hi">
+.
+<p>&lt;a h*#ref=&quot;hi&quot;&gt;</p>
+````````````````````````````````
+
+
+Illegal attribute values:
+
+```````````````````````````````` example
+<a href="hi'> <a href=hi'>
+.
+<p>&lt;a href=&quot;hi'&gt; &lt;a href=hi'&gt;</p>
+````````````````````````````````
+
+
+Illegal whitespace:
+
+```````````````````````````````` example
+< a><
+foo><bar/ >
+<foo bar=baz
+bim!bop />
+.
+<p>&lt; a&gt;&lt;
+foo&gt;&lt;bar/ &gt;
+&lt;foo bar=baz
+bim!bop /&gt;</p>
+````````````````````````````````
+
+
+Missing whitespace:
+
+```````````````````````````````` example
+<a href='bar'title=title>
+.
+<p>&lt;a href='bar'title=title&gt;</p>
+````````````````````````````````
+
+
+Closing tags:
+
+```````````````````````````````` example
+</a></foo >
+.
+<p></a></foo ></p>
+````````````````````````````````
+
+
+Illegal attributes in closing tag:
+
+```````````````````````````````` example
+</a href="foo">
+.
+<p>&lt;/a href=&quot;foo&quot;&gt;</p>
+````````````````````````````````
+
+
+Comments:
+
+```````````````````````````````` example
+foo <!-- this is a
+comment - with hyphen -->
+.
+<p>foo <!-- this is a
+comment - with hyphen --></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo <!-- not a comment -- two hyphens -->
+.
+<p>foo &lt;!-- not a comment -- two hyphens --&gt;</p>
+````````````````````````````````
+
+
+Not comments:
+
+```````````````````````````````` example
+foo <!--> foo -->
+
+foo <!-- foo--->
+.
+<p>foo &lt;!--&gt; foo --&gt;</p>
+<p>foo &lt;!-- foo---&gt;</p>
+````````````````````````````````
+
+
+Processing instructions:
+
+```````````````````````````````` example
+foo <?php echo $a; ?>
+.
+<p>foo <?php echo $a; ?></p>
+````````````````````````````````
+
+
+Declarations:
+
+```````````````````````````````` example
+foo <!ELEMENT br EMPTY>
+.
+<p>foo <!ELEMENT br EMPTY></p>
+````````````````````````````````
+
+
+CDATA sections:
+
+```````````````````````````````` example
+foo <![CDATA[>&<]]>
+.
+<p>foo <![CDATA[>&<]]></p>
+````````````````````````````````
+
+
+Entity and numeric character references are preserved in HTML
+attributes:
+
+```````````````````````````````` example
+foo <a href="&ouml;">
+.
+<p>foo <a href="&ouml;"></p>
+````````````````````````````````
+
+
+Backslash escapes do not work in HTML attributes:
+
+```````````````````````````````` example
+foo <a href="\*">
+.
+<p>foo <a href="\*"></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<a href="\"">
+.
+<p>&lt;a href=&quot;&quot;&quot;&gt;</p>
+````````````````````````````````
+
+
+## Hard line breaks
+
+A line ending (not in a code span or HTML tag) that is preceded
+by two or more spaces and does not occur at the end of a block
+is parsed as a [hard line break](@) (rendered
+in HTML as a `<br />` tag):
+
+```````````````````````````````` example
+foo  
+baz
+.
+<p>foo<br />
+baz</p>
+````````````````````````````````
+
+
+For a more visible alternative, a backslash before the
+[line ending] may be used instead of two or more spaces:
+
+```````````````````````````````` example
+foo\
+baz
+.
+<p>foo<br />
+baz</p>
+````````````````````````````````
+
+
+More than two spaces can be used:
+
+```````````````````````````````` example
+foo       
+baz
+.
+<p>foo<br />
+baz</p>
+````````````````````````````````
+
+
+Leading spaces at the beginning of the next line are ignored:
+
+```````````````````````````````` example
+foo  
+     bar
+.
+<p>foo<br />
+bar</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo\
+     bar
+.
+<p>foo<br />
+bar</p>
+````````````````````````````````
+
+
+Hard line breaks can occur inside emphasis, links, and other constructs
+that allow inline content:
+
+```````````````````````````````` example
+*foo  
+bar*
+.
+<p><em>foo<br />
+bar</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo\
+bar*
+.
+<p><em>foo<br />
+bar</em></p>
+````````````````````````````````
+
+
+Hard line breaks do not occur inside code spans
+
+```````````````````````````````` example
+`code  
+span`
+.
+<p><code>code   span</code></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+`code\
+span`
+.
+<p><code>code\ span</code></p>
+````````````````````````````````
+
+
+or HTML tags:
+
+```````````````````````````````` example
+<a href="foo  
+bar">
+.
+<p><a href="foo  
+bar"></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<a href="foo\
+bar">
+.
+<p><a href="foo\
+bar"></p>
+````````````````````````````````
+
+
+Hard line breaks are for separating inline content within a block.
+Neither syntax for hard line breaks works at the end of a paragraph or
+other block element:
+
+```````````````````````````````` example
+foo\
+.
+<p>foo\</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo  
+.
+<p>foo</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+### foo\
+.
+<h3>foo\</h3>
+````````````````````````````````
+
+
+```````````````````````````````` example
+### foo  
+.
+<h3>foo</h3>
+````````````````````````````````
+
+
+## Soft line breaks
+
+A regular line ending (not in a code span or HTML tag) that is not
+preceded by two or more spaces or a backslash is parsed as a
+[softbreak](@).  (A soft line break may be rendered in HTML either as a
+[line ending] or as a space. The result will be the same in
+browsers. In the examples here, a [line ending] will be used.)
+
+```````````````````````````````` example
+foo
+baz
+.
+<p>foo
+baz</p>
+````````````````````````````````
+
+
+Spaces at the end of the line and beginning of the next line are
+removed:
+
+```````````````````````````````` example
+foo 
+ baz
+.
+<p>foo
+baz</p>
+````````````````````````````````
+
+
+A conforming parser may render a soft line break in HTML either as a
+line ending or as a space.
+
+A renderer may also provide an option to render soft line breaks
+as hard line breaks.
+
+## Textual content
+
+Any characters not given an interpretation by the above rules will
+be parsed as plain textual content.
+
+```````````````````````````````` example
+hello $.;'there
+.
+<p>hello $.;'there</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+Foo χρῆν
+.
+<p>Foo χρῆν</p>
+````````````````````````````````
+
+
+Internal spaces are preserved verbatim:
+
+```````````````````````````````` example
+Multiple     spaces
+.
+<p>Multiple     spaces</p>
+````````````````````````````````
+
+
+<!-- END TESTS -->
+
+# Appendix: A parsing strategy
+
+In this appendix we describe some features of the parsing strategy
+used in the CommonMark reference implementations.
+
+## Overview
+
+Parsing has two phases:
+
+1. In the first phase, lines of input are consumed and the block
+structure of the document---its division into paragraphs, block quotes,
+list items, and so on---is constructed.  Text is assigned to these
+blocks but not parsed. Link reference definitions are parsed and a
+map of links is constructed.
+
+2. In the second phase, the raw text contents of paragraphs and headings
+are parsed into sequences of Markdown inline elements (strings,
+code spans, links, emphasis, and so on), using the map of link
+references constructed in phase 1.
+
+At each point in processing, the document is represented as a tree of
+**blocks**.  The root of the tree is a `document` block.  The `document`
+may have any number of other blocks as **children**.  These children
+may, in turn, have other blocks as children.  The last child of a block
+is normally considered **open**, meaning that subsequent lines of input
+can alter its contents.  (Blocks that are not open are **closed**.)
+Here, for example, is a possible document tree, with the open blocks
+marked by arrows:
+
+``` tree
+-> document
+  -> block_quote
+       paragraph
+         "Lorem ipsum dolor\nsit amet."
+    -> list (type=bullet tight=true bullet_char=-)
+         list_item
+           paragraph
+             "Qui *quodsi iracundia*"
+      -> list_item
+        -> paragraph
+             "aliquando id"
+```
+
+## Phase 1: block structure
+
+Each line that is processed has an effect on this tree.  The line is
+analyzed and, depending on its contents, the document may be altered
+in one or more of the following ways:
+
+1. One or more open blocks may be closed.
+2. One or more new blocks may be created as children of the
+   last open block.
+3. Text may be added to the last (deepest) open block remaining
+   on the tree.
+
+Once a line has been incorporated into the tree in this way,
+it can be discarded, so input can be read in a stream.
+
+For each line, we follow this procedure:
+
+1. First we iterate through the open blocks, starting with the
+root document, and descending through last children down to the last
+open block.  Each block imposes a condition that the line must satisfy
+if the block is to remain open.  For example, a block quote requires a
+`>` character.  A paragraph requires a non-blank line.
+In this phase we may match all or just some of the open
+blocks.  But we cannot close unmatched blocks yet, because we may have a
+[lazy continuation line].
+
+2.  Next, after consuming the continuation markers for existing
+blocks, we look for new block starts (e.g. `>` for a block quote).
+If we encounter a new block start, we close any blocks unmatched
+in step 1 before creating the new block as a child of the last
+matched container block.
+
+3.  Finally, we look at the remainder of the line (after block
+markers like `>`, list markers, and indentation have been consumed).
+This is text that can be incorporated into the last open
+block (a paragraph, code block, heading, or raw HTML).
+
+Setext headings are formed when we see a line of a paragraph
+that is a [setext heading underline].
+
+Reference link definitions are detected when a paragraph is closed;
+the accumulated text lines are parsed to see if they begin with
+one or more reference link definitions.  Any remainder becomes a
+normal paragraph.
+
+We can see how this works by considering how the tree above is
+generated by four lines of Markdown:
+
+``` markdown
+> Lorem ipsum dolor
+sit amet.
+> - Qui *quodsi iracundia*
+> - aliquando id
+```
+
+At the outset, our document model is just
+
+``` tree
+-> document
+```
+
+The first line of our text,
+
+``` markdown
+> Lorem ipsum dolor
+```
+
+causes a `block_quote` block to be created as a child of our
+open `document` block, and a `paragraph` block as a child of
+the `block_quote`.  Then the text is added to the last open
+block, the `paragraph`:
+
+``` tree
+-> document
+  -> block_quote
+    -> paragraph
+         "Lorem ipsum dolor"
+```
+
+The next line,
+
+``` markdown
+sit amet.
+```
+
+is a "lazy continuation" of the open `paragraph`, so it gets added
+to the paragraph's text:
+
+``` tree
+-> document
+  -> block_quote
+    -> paragraph
+         "Lorem ipsum dolor\nsit amet."
+```
+
+The third line,
+
+``` markdown
+> - Qui *quodsi iracundia*
+```
+
+causes the `paragraph` block to be closed, and a new `list` block
+opened as a child of the `block_quote`.  A `list_item` is also
+added as a child of the `list`, and a `paragraph` as a child of
+the `list_item`.  The text is then added to the new `paragraph`:
+
+``` tree
+-> document
+  -> block_quote
+       paragraph
+         "Lorem ipsum dolor\nsit amet."
+    -> list (type=bullet tight=true bullet_char=-)
+      -> list_item
+        -> paragraph
+             "Qui *quodsi iracundia*"
+```
+
+The fourth line,
+
+``` markdown
+> - aliquando id
+```
+
+causes the `list_item` (and its child the `paragraph`) to be closed,
+and a new `list_item` opened up as child of the `list`.  A `paragraph`
+is added as a child of the new `list_item`, to contain the text.
+We thus obtain the final tree:
+
+``` tree
+-> document
+  -> block_quote
+       paragraph
+         "Lorem ipsum dolor\nsit amet."
+    -> list (type=bullet tight=true bullet_char=-)
+         list_item
+           paragraph
+             "Qui *quodsi iracundia*"
+      -> list_item
+        -> paragraph
+             "aliquando id"
+```
+
+## Phase 2: inline structure
+
+Once all of the input has been parsed, all open blocks are closed.
+
+We then "walk the tree," visiting every node, and parse raw
+string contents of paragraphs and headings as inlines.  At this
+point we have seen all the link reference definitions, so we can
+resolve reference links as we go.
+
+``` tree
+document
+  block_quote
+    paragraph
+      str "Lorem ipsum dolor"
+      softbreak
+      str "sit amet."
+    list (type=bullet tight=true bullet_char=-)
+      list_item
+        paragraph
+          str "Qui "
+          emph
+            str "quodsi iracundia"
+      list_item
+        paragraph
+          str "aliquando id"
+```
+
+Notice how the [line ending] in the first paragraph has
+been parsed as a `softbreak`, and the asterisks in the first list item
+have become an `emph`.
+
+### An algorithm for parsing nested emphasis and links
+
+By far the trickiest part of inline parsing is handling emphasis,
+strong emphasis, links, and images.  This is done using the following
+algorithm.
+
+When we're parsing inlines and we hit either
+
+- a run of `*` or `_` characters, or
+- a `[` or `![`
+
+we insert a text node with these symbols as its literal content, and we
+add a pointer to this text node to the [delimiter stack](@).
+
+The [delimiter stack] is a doubly linked list.  Each
+element contains a pointer to a text node, plus information about
+
+- the type of delimiter (`[`, `![`, `*`, `_`)
+- the number of delimiters,
+- whether the delimiter is "active" (all are active to start), and
+- whether the delimiter is a potential opener, a potential closer,
+  or both (which depends on what sort of characters precede
+  and follow the delimiters).
+
+When we hit a `]` character, we call the *look for link or image*
+procedure (see below).
+
+When we hit the end of the input, we call the *process emphasis*
+procedure (see below), with `stack_bottom` = NULL.
+
+#### *look for link or image*
+
+Starting at the top of the delimiter stack, we look backwards
+through the stack for an opening `[` or `![` delimiter.
+
+- If we don't find one, we return a literal text node `]`.
+
+- If we do find one, but it's not *active*, we remove the inactive
+  delimiter from the stack, and return a literal text node `]`.
+
+- If we find one and it's active, then we parse ahead to see if
+  we have an inline link/image, reference link/image, compact reference
+  link/image, or shortcut reference link/image.
+
+  + If we don't, then we remove the opening delimiter from the
+    delimiter stack and return a literal text node `]`.
+
+  + If we do, then
+
+    * We return a link or image node whose children are the inlines
+      after the text node pointed to by the opening delimiter.
+
+    * We run *process emphasis* on these inlines, with the `[` opener
+      as `stack_bottom`.
+
+    * We remove the opening delimiter.
+
+    * If we have a link (and not an image), we also set all
+      `[` delimiters before the opening delimiter to *inactive*.  (This
+      will prevent us from getting links within links.)
+
+#### *process emphasis*
+
+Parameter `stack_bottom` sets a lower bound to how far we
+descend in the [delimiter stack].  If it is NULL, we can
+go all the way to the bottom.  Otherwise, we stop before
+visiting `stack_bottom`.
+
+Let `current_position` point to the element on the [delimiter stack]
+just above `stack_bottom` (or the first element if `stack_bottom`
+is NULL).
+
+We keep track of the `openers_bottom` for each delimiter
+type (`*`, `_`), indexed to the length of the closing delimiter run
+(modulo 3) and to whether the closing delimiter can also be an
+opener.  Initialize this to `stack_bottom`.
+
+Then we repeat the following until we run out of potential
+closers:
+
+- Move `current_position` forward in the delimiter stack (if needed)
+  until we find the first potential closer with delimiter `*` or `_`.
+  (This will be the potential closer closest
+  to the beginning of the input -- the first one in parse order.)
+
+- Now, look back in the stack (staying above `stack_bottom` and
+  the `openers_bottom` for this delimiter type) for the
+  first matching potential opener ("matching" means same delimiter).
+
+- If one is found:
+
+  + Figure out whether we have emphasis or strong emphasis:
+    if both closer and opener spans have length >= 2, we have
+    strong, otherwise regular.
+
+  + Insert an emph or strong emph node accordingly, after
+    the text node corresponding to the opener.
+
+  + Remove any delimiters between the opener and closer from
+    the delimiter stack.
+
+  + Remove 1 (for regular emph) or 2 (for strong emph) delimiters
+    from the opening and closing text nodes.  If they become empty
+    as a result, remove them and remove the corresponding element
+    of the delimiter stack.  If the closing node is removed, reset
+    `current_position` to the next element in the stack.
+
+- If none is found:
+
+  + Set `openers_bottom` to the element before `current_position`.
+    (We know that there are no openers for this kind of closer up to and
+    including this point, so this puts a lower bound on future searches.)
+
+  + If the closer at `current_position` is not a potential opener,
+    remove it from the delimiter stack (since we know it can't
+    be a closer either).
+
+  + Advance `current_position` to the next element in the stack.
+
+After we're done, we remove all delimiters above `stack_bottom` from the
+delimiter stack.
diff --git a/tests/test_cmark_spec/spec.sh b/tests/test_cmark_spec/spec.sh
new file mode 100755
index 0000000..c851390
--- /dev/null
+++ b/tests/test_cmark_spec/spec.sh
@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+set -e
+
+REPO="https://github.com/commonmark/CommonMark.git"
+VERSION="0.30"
+
+function main {
+    echo "Cloning from repo: $REPO..."
+    git clone --quiet $REPO
+
+    echo "Using version $VERSION..."
+    cd "CommonMark"
+    git checkout --quiet $VERSION
+
+    echo "Dumping tests file..."
+    python3 "test/spec_tests.py" --dump-tests > "../commonmark.json"
+
+    echo "Cleaning up..."
+    cd ..
+    rm -rf CommonMark
+
+    echo "Done."
+}
+
+main
diff --git a/tests/test_cmark_spec/test_spec.py b/tests/test_cmark_spec/test_spec.py
new file mode 100644
index 0000000..88d9fca
--- /dev/null
+++ b/tests/test_cmark_spec/test_spec.py
@@ -0,0 +1,35 @@
+"""In this module tests are run against the full test set,
+provided by https://github.com/commonmark/CommonMark.git.
+"""
+import json
+from pathlib import Path
+
+import pytest
+
+from markdown_it import MarkdownIt
+
+SPEC_INPUT = Path(__file__).parent.joinpath("spec.md")
+TESTS_INPUT = Path(__file__).parent.joinpath("commonmark.json")
+
+
+def test_file(file_regression):
+    md = MarkdownIt("commonmark")
+    file_regression.check(md.render(SPEC_INPUT.read_text()), extension=".html")
+
+
+@pytest.mark.parametrize("entry", json.loads(TESTS_INPUT.read_text()))
+def test_spec(entry):
+    md = MarkdownIt("commonmark")
+    output = md.render(entry["markdown"])
+    expected = entry["html"]
+
+    if entry["example"] == 596:
+        # this doesn't have any bearing on the output
+        output = output.replace("mailto", "MAILTO")
+    if entry["example"] in [218, 239, 240]:
+        # this doesn't have any bearing on the output
+        output = output.replace(
+            "<blockquote></blockquote>", "<blockquote>\n</blockquote>"
+        )
+
+    assert output == expected
diff --git a/tests/test_cmark_spec/test_spec/test_file.html b/tests/test_cmark_spec/test_spec/test_file.html
new file mode 100644
index 0000000..1c2dc3c
--- /dev/null
+++ b/tests/test_cmark_spec/test_spec/test_file.html
@@ -0,0 +1,7174 @@
+<hr />
+<p>title: CommonMark Spec
+author: John MacFarlane
+version: 0.30
+date: '2021-06-19'
+license: '<a href="http://creativecommons.org/licenses/by-sa/4.0/">CC-BY-SA 4.0</a>'
+...</p>
+<h1>Introduction</h1>
+<h2>What is Markdown?</h2>
+<p>Markdown is a plain text format for writing structured documents,
+based on conventions for indicating formatting in email
+and usenet posts.  It was developed by John Gruber (with
+help from Aaron Swartz) and released in 2004 in the form of a
+<a href="http://daringfireball.net/projects/markdown/syntax">syntax description</a>
+and a Perl script (<code>Markdown.pl</code>) for converting Markdown to
+HTML.  In the next decade, dozens of implementations were
+developed in many languages.  Some extended the original
+Markdown syntax with conventions for footnotes, tables, and
+other document elements.  Some allowed Markdown documents to be
+rendered in formats other than HTML.  Websites like Reddit,
+StackOverflow, and GitHub had millions of people using Markdown.
+And Markdown started to be used beyond the web, to author books,
+articles, slide shows, letters, and lecture notes.</p>
+<p>What distinguishes Markdown from many other lightweight markup
+syntaxes, which are often easier to write, is its readability.
+As Gruber writes:</p>
+<blockquote>
+<p>The overriding design goal for Markdown's formatting syntax is
+to make it as readable as possible. The idea is that a
+Markdown-formatted document should be publishable as-is, as
+plain text, without looking like it's been marked up with tags
+or formatting instructions.
+(<a href="http://daringfireball.net/projects/markdown/">http://daringfireball.net/projects/markdown/</a>)</p>
+</blockquote>
+<p>The point can be illustrated by comparing a sample of
+<a href="http://www.methods.co.nz/asciidoc/">AsciiDoc</a> with
+an equivalent sample of Markdown.  Here is a sample of
+AsciiDoc from the AsciiDoc manual:</p>
+<pre><code>1. List item one.
++
+List item one continued with a second paragraph followed by an
+Indented block.
++
+.................
+$ ls *.sh
+$ mv *.sh ~/tmp
+.................
++
+List item continued with a third paragraph.
+
+2. List item two continued with an open block.
++
+--
+This paragraph is part of the preceding list item.
+
+a. This list is nested and does not require explicit item
+continuation.
++
+This paragraph is part of the preceding list item.
+
+b. List item b.
+
+This paragraph belongs to item two of the outer list.
+--
+</code></pre>
+<p>And here is the equivalent in Markdown:</p>
+<pre><code>1.  List item one.
+
+    List item one continued with a second paragraph followed by an
+    Indented block.
+
+        $ ls *.sh
+        $ mv *.sh ~/tmp
+
+    List item continued with a third paragraph.
+
+2.  List item two continued with an open block.
+
+    This paragraph is part of the preceding list item.
+
+    1. This list is nested and does not require explicit item continuation.
+
+       This paragraph is part of the preceding list item.
+
+    2. List item b.
+
+    This paragraph belongs to item two of the outer list.
+</code></pre>
+<p>The AsciiDoc version is, arguably, easier to write. You don't need
+to worry about indentation.  But the Markdown version is much easier
+to read.  The nesting of list items is apparent to the eye in the
+source, not just in the processed document.</p>
+<h2>Why is a spec needed?</h2>
+<p>John Gruber's <a href="http://daringfireball.net/projects/markdown/syntax">canonical description of Markdown's
+syntax</a>
+does not specify the syntax unambiguously.  Here are some examples of
+questions it does not answer:</p>
+<ol>
+<li>
+<p>How much indentation is needed for a sublist?  The spec says that
+continuation paragraphs need to be indented four spaces, but is
+not fully explicit about sublists.  It is natural to think that
+they, too, must be indented four spaces, but <code>Markdown.pl</code> does
+not require that.  This is hardly a &quot;corner case,&quot; and divergences
+between implementations on this issue often lead to surprises for
+users in real documents. (See <a href="http://article.gmane.org/gmane.text.markdown.general/1997">this comment by John
+Gruber</a>.)</p>
+</li>
+<li>
+<p>Is a blank line needed before a block quote or heading?
+Most implementations do not require the blank line.  However,
+this can lead to unexpected results in hard-wrapped text, and
+also to ambiguities in parsing (note that some implementations
+put the heading inside the blockquote, while others do not).
+(John Gruber has also spoken <a href="http://article.gmane.org/gmane.text.markdown.general/2146">in favor of requiring the blank
+lines</a>.)</p>
+</li>
+<li>
+<p>Is a blank line needed before an indented code block?
+(<code>Markdown.pl</code> requires it, but this is not mentioned in the
+documentation, and some implementations do not require it.)</p>
+<pre><code class="language-markdown">paragraph
+    code?
+</code></pre>
+</li>
+<li>
+<p>What is the exact rule for determining when list items get
+wrapped in <code>&lt;p&gt;</code> tags?  Can a list be partially &quot;loose&quot; and partially
+&quot;tight&quot;?  What should we do with a list like this?</p>
+<pre><code class="language-markdown">1. one
+
+2. two
+3. three
+</code></pre>
+<p>Or this?</p>
+<pre><code class="language-markdown">1.  one
+    - a
+
+    - b
+2.  two
+</code></pre>
+<p>(There are some relevant comments by John Gruber
+<a href="http://article.gmane.org/gmane.text.markdown.general/2554">here</a>.)</p>
+</li>
+<li>
+<p>Can list markers be indented?  Can ordered list markers be right-aligned?</p>
+<pre><code class="language-markdown"> 8. item 1
+ 9. item 2
+10. item 2a
+</code></pre>
+</li>
+<li>
+<p>Is this one list with a thematic break in its second item,
+or two lists separated by a thematic break?</p>
+<pre><code class="language-markdown">* a
+* * * * *
+* b
+</code></pre>
+</li>
+<li>
+<p>When list markers change from numbers to bullets, do we have
+two lists or one?  (The Markdown syntax description suggests two,
+but the perl scripts and many other implementations produce one.)</p>
+<pre><code class="language-markdown">1. fee
+2. fie
+-  foe
+-  fum
+</code></pre>
+</li>
+<li>
+<p>What are the precedence rules for the markers of inline structure?
+For example, is the following a valid link, or does the code span
+take precedence ?</p>
+<pre><code class="language-markdown">[a backtick (`)](/url) and [another backtick (`)](/url).
+</code></pre>
+</li>
+<li>
+<p>What are the precedence rules for markers of emphasis and strong
+emphasis?  For example, how should the following be parsed?</p>
+<pre><code class="language-markdown">*foo *bar* baz*
+</code></pre>
+</li>
+<li>
+<p>What are the precedence rules between block-level and inline-level
+structure?  For example, how should the following be parsed?</p>
+<pre><code class="language-markdown">- `a long code span can contain a hyphen like this
+  - and it can screw things up`
+</code></pre>
+</li>
+<li>
+<p>Can list items include section headings?  (<code>Markdown.pl</code> does not
+allow this, but does allow blockquotes to include headings.)</p>
+<pre><code class="language-markdown">- # Heading
+</code></pre>
+</li>
+<li>
+<p>Can list items be empty?</p>
+<pre><code class="language-markdown">* a
+*
+* b
+</code></pre>
+</li>
+<li>
+<p>Can link references be defined inside block quotes or list items?</p>
+<pre><code class="language-markdown">&gt; Blockquote [foo].
+&gt;
+&gt; [foo]: /url
+</code></pre>
+</li>
+<li>
+<p>If there are multiple definitions for the same reference, which takes
+precedence?</p>
+<pre><code class="language-markdown">[foo]: /url1
+[foo]: /url2
+
+[foo][]
+</code></pre>
+</li>
+</ol>
+<p>In the absence of a spec, early implementers consulted <code>Markdown.pl</code>
+to resolve these ambiguities.  But <code>Markdown.pl</code> was quite buggy, and
+gave manifestly bad results in many cases, so it was not a
+satisfactory replacement for a spec.</p>
+<p>Because there is no unambiguous spec, implementations have diverged
+considerably.  As a result, users are often surprised to find that
+a document that renders one way on one system (say, a GitHub wiki)
+renders differently on another (say, converting to docbook using
+pandoc).  To make matters worse, because nothing in Markdown counts
+as a &quot;syntax error,&quot; the divergence often isn't discovered right away.</p>
+<h2>About this document</h2>
+<p>This document attempts to specify Markdown syntax unambiguously.
+It contains many examples with side-by-side Markdown and
+HTML.  These are intended to double as conformance tests.  An
+accompanying script <code>spec_tests.py</code> can be used to run the tests
+against any Markdown program:</p>
+<pre><code>python test/spec_tests.py --spec spec.txt --program PROGRAM
+</code></pre>
+<p>Since this document describes how Markdown is to be parsed into
+an abstract syntax tree, it would have made sense to use an abstract
+representation of the syntax tree instead of HTML.  But HTML is capable
+of representing the structural distinctions we need to make, and the
+choice of HTML for the tests makes it possible to run the tests against
+an implementation without writing an abstract syntax tree renderer.</p>
+<p>Note that not every feature of the HTML samples is mandated by
+the spec.  For example, the spec says what counts as a link
+destination, but it doesn't mandate that non-ASCII characters in
+the URL be percent-encoded.  To use the automatic tests,
+implementers will need to provide a renderer that conforms to
+the expectations of the spec examples (percent-encoding
+non-ASCII characters in URLs).  But a conforming implementation
+can use a different renderer and may choose not to
+percent-encode non-ASCII characters in URLs.</p>
+<p>This document is generated from a text file, <code>spec.txt</code>, written
+in Markdown with a small extension for the side-by-side tests.
+The script <code>tools/makespec.py</code> can be used to convert <code>spec.txt</code> into
+HTML or CommonMark (which can then be converted into other formats).</p>
+<p>In the examples, the <code>→</code> character is used to represent tabs.</p>
+<h1>Preliminaries</h1>
+<h2>Characters and lines</h2>
+<p>Any sequence of [characters] is a valid CommonMark
+document.</p>
+<p>A <a href="@">character</a> is a Unicode code point.  Although some
+code points (for example, combining accents) do not correspond to
+characters in an intuitive sense, all code points count as characters
+for purposes of this spec.</p>
+<p>This spec does not specify an encoding; it thinks of lines as composed
+of [characters] rather than bytes.  A conforming parser may be limited
+to a certain encoding.</p>
+<p>A <a href="@">line</a> is a sequence of zero or more [characters]
+other than line feed (<code>U+000A</code>) or carriage return (<code>U+000D</code>),
+followed by a [line ending] or by the end of file.</p>
+<p>A <a href="@">line ending</a> is a line feed (<code>U+000A</code>), a carriage return
+(<code>U+000D</code>) not followed by a line feed, or a carriage return and a
+following line feed.</p>
+<p>A line containing no characters, or a line containing only spaces
+(<code>U+0020</code>) or tabs (<code>U+0009</code>), is called a <a href="@">blank line</a>.</p>
+<p>The following definitions of character classes will be used in this spec:</p>
+<p>A <a href="@">Unicode whitespace character</a> is
+any code point in the Unicode <code>Zs</code> general category, or a tab (<code>U+0009</code>),
+line feed (<code>U+000A</code>), form feed (<code>U+000C</code>), or carriage return (<code>U+000D</code>).</p>
+<p><a href="@">Unicode whitespace</a> is a sequence of one or more
+[Unicode whitespace characters].</p>
+<p>A <a href="@">tab</a> is <code>U+0009</code>.</p>
+<p>A <a href="@">space</a> is <code>U+0020</code>.</p>
+<p>An <a href="@">ASCII control character</a> is a character between <code>U+0000–1F</code> (both
+including) or <code>U+007F</code>.</p>
+<p>An <a href="@">ASCII punctuation character</a>
+is <code>!</code>, <code>&quot;</code>, <code>#</code>, <code>$</code>, <code>%</code>, <code>&amp;</code>, <code>'</code>, <code>(</code>, <code>)</code>,
+<code>*</code>, <code>+</code>, <code>,</code>, <code>-</code>, <code>.</code>, <code>/</code> (U+0021–2F),
+<code>:</code>, <code>;</code>, <code>&lt;</code>, <code>=</code>, <code>&gt;</code>, <code>?</code>, <code>@</code> (U+003A–0040),
+<code>[</code>, <code>\</code>, <code>]</code>, <code>^</code>, <code>_</code>, <code>`</code> (U+005B–0060),
+<code>{</code>, <code>|</code>, <code>}</code>, or <code>~</code> (U+007B–007E).</p>
+<p>A <a href="@">Unicode punctuation character</a> is an [ASCII
+punctuation character] or anything in
+the general Unicode categories  <code>Pc</code>, <code>Pd</code>, <code>Pe</code>, <code>Pf</code>, <code>Pi</code>, <code>Po</code>, or <code>Ps</code>.</p>
+<h2>Tabs</h2>
+<p>Tabs in lines are not expanded to [spaces].  However,
+in contexts where spaces help to define block structure,
+tabs behave as if they were replaced by spaces with a tab stop
+of 4 characters.</p>
+<p>Thus, for example, a tab can be used instead of four spaces
+in an indented code block.  (Note, however, that internal
+tabs are passed through as literal tabs, not expanded to
+spaces.)</p>
+<pre><code class="language-example">→foo→baz→→bim
+.
+&lt;pre&gt;&lt;code&gt;foo→baz→→bim
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">  →foo→baz→→bim
+.
+&lt;pre&gt;&lt;code&gt;foo→baz→→bim
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">    a→a
+    ὐ→a
+.
+&lt;pre&gt;&lt;code&gt;a→a
+ὐ→a
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>In the following example, a continuation paragraph of a list
+item is indented with a tab; this has exactly the same effect
+as indentation with four spaces would:</p>
+<pre><code class="language-example">  - foo
+
+→bar
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;p&gt;bar&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<pre><code class="language-example">- foo
+
+→→bar
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;  bar
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>Normally the <code>&gt;</code> that begins a block quote may be followed
+optionally by a space, which is not considered part of the
+content.  In the following case <code>&gt;</code> is followed by a tab,
+which is treated as if it were expanded into three spaces.
+Since one of these spaces is considered part of the
+delimiter, <code>foo</code> is considered to be indented six spaces
+inside the block quote context, so we get an indented
+code block starting with two spaces.</p>
+<pre><code class="language-example">&gt;→→foo
+.
+&lt;blockquote&gt;
+&lt;pre&gt;&lt;code&gt;  foo
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<pre><code class="language-example">-→→foo
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;pre&gt;&lt;code&gt;  foo
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<pre><code class="language-example">    foo
+→bar
+.
+&lt;pre&gt;&lt;code&gt;foo
+bar
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example"> - foo
+   - bar
+→ - baz
+.
+&lt;ul&gt;
+&lt;li&gt;foo
+&lt;ul&gt;
+&lt;li&gt;bar
+&lt;ul&gt;
+&lt;li&gt;baz&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<pre><code class="language-example">#→Foo
+.
+&lt;h1&gt;Foo&lt;/h1&gt;
+</code></pre>
+<pre><code class="language-example">*→*→*→
+.
+&lt;hr /&gt;
+</code></pre>
+<h2>Insecure characters</h2>
+<p>For security reasons, the Unicode character <code>U+0000</code> must be replaced
+with the REPLACEMENT CHARACTER (<code>U+FFFD</code>).</p>
+<h2>Backslash escapes</h2>
+<p>Any ASCII punctuation character may be backslash-escaped:</p>
+<pre><code class="language-example">\!\&quot;\#\$\%\&amp;\'\(\)\*\+\,\-\.\/\:\;\&lt;\=\&gt;\?\@\[\\\]\^\_\`\{\|\}\~
+.
+&lt;p&gt;!&amp;quot;#$%&amp;amp;'()*+,-./:;&amp;lt;=&amp;gt;?@[\]^_`{|}~&lt;/p&gt;
+</code></pre>
+<p>Backslashes before other characters are treated as literal
+backslashes:</p>
+<pre><code class="language-example">\→\A\a\ \3\φ\«
+.
+&lt;p&gt;\→\A\a\ \3\φ\«&lt;/p&gt;
+</code></pre>
+<p>Escaped characters are treated as regular characters and do
+not have their usual Markdown meanings:</p>
+<pre><code class="language-example">\*not emphasized*
+\&lt;br/&gt; not a tag
+\[not a link](/foo)
+\`not code`
+1\. not a list
+\* not a list
+\# not a heading
+\[foo]: /url &quot;not a reference&quot;
+\&amp;ouml; not a character entity
+.
+&lt;p&gt;*not emphasized*
+&amp;lt;br/&amp;gt; not a tag
+[not a link](/foo)
+`not code`
+1. not a list
+* not a list
+# not a heading
+[foo]: /url &amp;quot;not a reference&amp;quot;
+&amp;amp;ouml; not a character entity&lt;/p&gt;
+</code></pre>
+<p>If a backslash is itself escaped, the following character is not:</p>
+<pre><code class="language-example">\\*emphasis*
+.
+&lt;p&gt;\&lt;em&gt;emphasis&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>A backslash at the end of the line is a [hard line break]:</p>
+<pre><code class="language-example">foo\
+bar
+.
+&lt;p&gt;foo&lt;br /&gt;
+bar&lt;/p&gt;
+</code></pre>
+<p>Backslash escapes do not work in code blocks, code spans, autolinks, or
+raw HTML:</p>
+<pre><code class="language-example">`` \[\` ``
+.
+&lt;p&gt;&lt;code&gt;\[\`&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">    \[\]
+.
+&lt;pre&gt;&lt;code&gt;\[\]
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">~~~
+\[\]
+~~~
+.
+&lt;pre&gt;&lt;code&gt;\[\]
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">&lt;http://example.com?find=\*&gt;
+.
+&lt;p&gt;&lt;a href=&quot;http://example.com?find=%5C*&quot;&gt;http://example.com?find=\*&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&lt;a href=&quot;/bar\/)&quot;&gt;
+.
+&lt;a href=&quot;/bar\/)&quot;&gt;
+</code></pre>
+<p>But they work in all other contexts, including URLs and link titles,
+link references, and [info strings] in [fenced code blocks]:</p>
+<pre><code class="language-example">[foo](/bar\* &quot;ti\*tle&quot;)
+.
+&lt;p&gt;&lt;a href=&quot;/bar*&quot; title=&quot;ti*tle&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo]
+
+[foo]: /bar\* &quot;ti\*tle&quot;
+.
+&lt;p&gt;&lt;a href=&quot;/bar*&quot; title=&quot;ti*tle&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">``` foo\+bar
+foo
+```
+.
+&lt;pre&gt;&lt;code class=&quot;language-foo+bar&quot;&gt;foo
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<h2>Entity and numeric character references</h2>
+<p>Valid HTML entity references and numeric character references
+can be used in place of the corresponding Unicode character,
+with the following exceptions:</p>
+<ul>
+<li>
+<p>Entity and character references are not recognized in code
+blocks and code spans.</p>
+</li>
+<li>
+<p>Entity and character references cannot stand in place of
+special characters that define structural elements in
+CommonMark.  For example, although <code>&amp;#42;</code> can be used
+in place of a literal <code>*</code> character, <code>&amp;#42;</code> cannot replace
+<code>*</code> in emphasis delimiters, bullet list markers, or thematic
+breaks.</p>
+</li>
+</ul>
+<p>Conforming CommonMark parsers need not store information about
+whether a particular character was represented in the source
+using a Unicode character or an entity reference.</p>
+<p><a href="@">Entity references</a> consist of <code>&amp;</code> + any of the valid
+HTML5 entity names + <code>;</code>. The
+document <a href="https://html.spec.whatwg.org/entities.json">https://html.spec.whatwg.org/entities.json</a>
+is used as an authoritative source for the valid entity
+references and their corresponding code points.</p>
+<pre><code class="language-example">&amp;nbsp; &amp;amp; &amp;copy; &amp;AElig; &amp;Dcaron;
+&amp;frac34; &amp;HilbertSpace; &amp;DifferentialD;
+&amp;ClockwiseContourIntegral; &amp;ngE;
+.
+&lt;p&gt;  &amp;amp; © Æ Ď
+¾ ℋ ⅆ
+∲ ≧̸&lt;/p&gt;
+</code></pre>
+<p><a href="@">Decimal numeric character
+references</a>
+consist of <code>&amp;#</code> + a string of 1--7 arabic digits + <code>;</code>. A
+numeric character reference is parsed as the corresponding
+Unicode character. Invalid Unicode code points will be replaced by
+the REPLACEMENT CHARACTER (<code>U+FFFD</code>).  For security reasons,
+the code point <code>U+0000</code> will also be replaced by <code>U+FFFD</code>.</p>
+<pre><code class="language-example">&amp;#35; &amp;#1234; &amp;#992; &amp;#0;
+.
+&lt;p&gt;# Ӓ Ϡ �&lt;/p&gt;
+</code></pre>
+<p><a href="@">Hexadecimal numeric character
+references</a> consist of <code>&amp;#</code> +
+either <code>X</code> or <code>x</code> + a string of 1-6 hexadecimal digits + <code>;</code>.
+They too are parsed as the corresponding Unicode character (this
+time specified with a hexadecimal numeral instead of decimal).</p>
+<pre><code class="language-example">&amp;#X22; &amp;#XD06; &amp;#xcab;
+.
+&lt;p&gt;&amp;quot; ആ ಫ&lt;/p&gt;
+</code></pre>
+<p>Here are some nonentities:</p>
+<pre><code class="language-example">&amp;nbsp &amp;x; &amp;#; &amp;#x;
+&amp;#87654321;
+&amp;#abcdef0;
+&amp;ThisIsNotDefined; &amp;hi?;
+.
+&lt;p&gt;&amp;amp;nbsp &amp;amp;x; &amp;amp;#; &amp;amp;#x;
+&amp;amp;#87654321;
+&amp;amp;#abcdef0;
+&amp;amp;ThisIsNotDefined; &amp;amp;hi?;&lt;/p&gt;
+</code></pre>
+<p>Although HTML5 does accept some entity references
+without a trailing semicolon (such as <code>&amp;copy</code>), these are not
+recognized here, because it makes the grammar too ambiguous:</p>
+<pre><code class="language-example">&amp;copy
+.
+&lt;p&gt;&amp;amp;copy&lt;/p&gt;
+</code></pre>
+<p>Strings that are not on the list of HTML5 named entities are not
+recognized as entity references either:</p>
+<pre><code class="language-example">&amp;MadeUpEntity;
+.
+&lt;p&gt;&amp;amp;MadeUpEntity;&lt;/p&gt;
+</code></pre>
+<p>Entity and numeric character references are recognized in any
+context besides code spans or code blocks, including
+URLs, [link titles], and [fenced code block][] [info strings]:</p>
+<pre><code class="language-example">&lt;a href=&quot;&amp;ouml;&amp;ouml;.html&quot;&gt;
+.
+&lt;a href=&quot;&amp;ouml;&amp;ouml;.html&quot;&gt;
+</code></pre>
+<pre><code class="language-example">[foo](/f&amp;ouml;&amp;ouml; &quot;f&amp;ouml;&amp;ouml;&quot;)
+.
+&lt;p&gt;&lt;a href=&quot;/f%C3%B6%C3%B6&quot; title=&quot;föö&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo]
+
+[foo]: /f&amp;ouml;&amp;ouml; &quot;f&amp;ouml;&amp;ouml;&quot;
+.
+&lt;p&gt;&lt;a href=&quot;/f%C3%B6%C3%B6&quot; title=&quot;föö&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">``` f&amp;ouml;&amp;ouml;
+foo
+```
+.
+&lt;pre&gt;&lt;code class=&quot;language-föö&quot;&gt;foo
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>Entity and numeric character references are treated as literal
+text in code spans and code blocks:</p>
+<pre><code class="language-example">`f&amp;ouml;&amp;ouml;`
+.
+&lt;p&gt;&lt;code&gt;f&amp;amp;ouml;&amp;amp;ouml;&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">    f&amp;ouml;f&amp;ouml;
+.
+&lt;pre&gt;&lt;code&gt;f&amp;amp;ouml;f&amp;amp;ouml;
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>Entity and numeric character references cannot be used
+in place of symbols indicating structure in CommonMark
+documents.</p>
+<pre><code class="language-example">&amp;#42;foo&amp;#42;
+*foo*
+.
+&lt;p&gt;*foo*
+&lt;em&gt;foo&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&amp;#42; foo
+
+* foo
+.
+&lt;p&gt;* foo&lt;/p&gt;
+&lt;ul&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<pre><code class="language-example">foo&amp;#10;&amp;#10;bar
+.
+&lt;p&gt;foo
+
+bar&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&amp;#9;foo
+.
+&lt;p&gt;→foo&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[a](url &amp;quot;tit&amp;quot;)
+.
+&lt;p&gt;[a](url &amp;quot;tit&amp;quot;)&lt;/p&gt;
+</code></pre>
+<h1>Blocks and inlines</h1>
+<p>We can think of a document as a sequence of
+<a href="@">blocks</a>---structural elements like paragraphs, block
+quotations, lists, headings, rules, and code blocks.  Some blocks (like
+block quotes and list items) contain other blocks; others (like
+headings and paragraphs) contain <a href="@">inline</a> content---text,
+links, emphasized text, images, code spans, and so on.</p>
+<h2>Precedence</h2>
+<p>Indicators of block structure always take precedence over indicators
+of inline structure.  So, for example, the following is a list with
+two items, not a list with one item containing a code span:</p>
+<pre><code class="language-example">- `one
+- two`
+.
+&lt;ul&gt;
+&lt;li&gt;`one&lt;/li&gt;
+&lt;li&gt;two`&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>This means that parsing can proceed in two steps:  first, the block
+structure of the document can be discerned; second, text lines inside
+paragraphs, headings, and other block constructs can be parsed for inline
+structure.  The second step requires information about link reference
+definitions that will be available only at the end of the first
+step.  Note that the first step requires processing lines in sequence,
+but the second can be parallelized, since the inline parsing of
+one block element does not affect the inline parsing of any other.</p>
+<h2>Container blocks and leaf blocks</h2>
+<p>We can divide blocks into two types:
+<a href="#container-blocks">container blocks</a>,
+which can contain other blocks, and <a href="#leaf-blocks">leaf blocks</a>,
+which cannot.</p>
+<h1>Leaf blocks</h1>
+<p>This section describes the different kinds of leaf block that make up a
+Markdown document.</p>
+<h2>Thematic breaks</h2>
+<p>A line consisting of optionally up to three spaces of indentation, followed by a
+sequence of three or more matching <code>-</code>, <code>_</code>, or <code>*</code> characters, each followed
+optionally by any number of spaces or tabs, forms a
+<a href="@">thematic break</a>.</p>
+<pre><code class="language-example">***
+---
+___
+.
+&lt;hr /&gt;
+&lt;hr /&gt;
+&lt;hr /&gt;
+</code></pre>
+<p>Wrong characters:</p>
+<pre><code class="language-example">+++
+.
+&lt;p&gt;+++&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">===
+.
+&lt;p&gt;===&lt;/p&gt;
+</code></pre>
+<p>Not enough characters:</p>
+<pre><code class="language-example">--
+**
+__
+.
+&lt;p&gt;--
+**
+__&lt;/p&gt;
+</code></pre>
+<p>Up to three spaces of indentation are allowed:</p>
+<pre><code class="language-example"> ***
+  ***
+   ***
+.
+&lt;hr /&gt;
+&lt;hr /&gt;
+&lt;hr /&gt;
+</code></pre>
+<p>Four spaces of indentation is too many:</p>
+<pre><code class="language-example">    ***
+.
+&lt;pre&gt;&lt;code&gt;***
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">Foo
+    ***
+.
+&lt;p&gt;Foo
+***&lt;/p&gt;
+</code></pre>
+<p>More than three characters may be used:</p>
+<pre><code class="language-example">_____________________________________
+.
+&lt;hr /&gt;
+</code></pre>
+<p>Spaces and tabs are allowed between the characters:</p>
+<pre><code class="language-example"> - - -
+.
+&lt;hr /&gt;
+</code></pre>
+<pre><code class="language-example"> **  * ** * ** * **
+.
+&lt;hr /&gt;
+</code></pre>
+<pre><code class="language-example">-     -      -      -
+.
+&lt;hr /&gt;
+</code></pre>
+<p>Spaces and tabs are allowed at the end:</p>
+<pre><code class="language-example">- - - -    
+.
+&lt;hr /&gt;
+</code></pre>
+<p>However, no other characters may occur in the line:</p>
+<pre><code class="language-example">_ _ _ _ a
+
+a------
+
+---a---
+.
+&lt;p&gt;_ _ _ _ a&lt;/p&gt;
+&lt;p&gt;a------&lt;/p&gt;
+&lt;p&gt;---a---&lt;/p&gt;
+</code></pre>
+<p>It is required that all of the characters other than spaces or tabs be the same.
+So, this is not a thematic break:</p>
+<pre><code class="language-example"> *-*
+.
+&lt;p&gt;&lt;em&gt;-&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>Thematic breaks do not need blank lines before or after:</p>
+<pre><code class="language-example">- foo
+***
+- bar
+.
+&lt;ul&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;/ul&gt;
+&lt;hr /&gt;
+&lt;ul&gt;
+&lt;li&gt;bar&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>Thematic breaks can interrupt a paragraph:</p>
+<pre><code class="language-example">Foo
+***
+bar
+.
+&lt;p&gt;Foo&lt;/p&gt;
+&lt;hr /&gt;
+&lt;p&gt;bar&lt;/p&gt;
+</code></pre>
+<p>If a line of dashes that meets the above conditions for being a
+thematic break could also be interpreted as the underline of a [setext
+heading], the interpretation as a
+[setext heading] takes precedence. Thus, for example,
+this is a setext heading, not a paragraph followed by a thematic break:</p>
+<pre><code class="language-example">Foo
+---
+bar
+.
+&lt;h2&gt;Foo&lt;/h2&gt;
+&lt;p&gt;bar&lt;/p&gt;
+</code></pre>
+<p>When both a thematic break and a list item are possible
+interpretations of a line, the thematic break takes precedence:</p>
+<pre><code class="language-example">* Foo
+* * *
+* Bar
+.
+&lt;ul&gt;
+&lt;li&gt;Foo&lt;/li&gt;
+&lt;/ul&gt;
+&lt;hr /&gt;
+&lt;ul&gt;
+&lt;li&gt;Bar&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>If you want a thematic break in a list item, use a different bullet:</p>
+<pre><code class="language-example">- Foo
+- * * *
+.
+&lt;ul&gt;
+&lt;li&gt;Foo&lt;/li&gt;
+&lt;li&gt;
+&lt;hr /&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<h2>ATX headings</h2>
+<p>An <a href="@">ATX heading</a>
+consists of a string of characters, parsed as inline content, between an
+opening sequence of 1--6 unescaped <code>#</code> characters and an optional
+closing sequence of any number of unescaped <code>#</code> characters.
+The opening sequence of <code>#</code> characters must be followed by spaces or tabs, or
+by the end of line. The optional closing sequence of <code>#</code>s must be preceded by
+spaces or tabs and may be followed by spaces or tabs only.  The opening
+<code>#</code> character may be preceded by up to three spaces of indentation.  The raw
+contents of the heading are stripped of leading and trailing space or tabs
+before being parsed as inline content.  The heading level is equal to the number
+of <code>#</code> characters in the opening sequence.</p>
+<p>Simple headings:</p>
+<pre><code class="language-example"># foo
+## foo
+### foo
+#### foo
+##### foo
+###### foo
+.
+&lt;h1&gt;foo&lt;/h1&gt;
+&lt;h2&gt;foo&lt;/h2&gt;
+&lt;h3&gt;foo&lt;/h3&gt;
+&lt;h4&gt;foo&lt;/h4&gt;
+&lt;h5&gt;foo&lt;/h5&gt;
+&lt;h6&gt;foo&lt;/h6&gt;
+</code></pre>
+<p>More than six <code>#</code> characters is not a heading:</p>
+<pre><code class="language-example">####### foo
+.
+&lt;p&gt;####### foo&lt;/p&gt;
+</code></pre>
+<p>At least one space or tab is required between the <code>#</code> characters and the
+heading's contents, unless the heading is empty.  Note that many
+implementations currently do not require the space.  However, the
+space was required by the
+<a href="http://www.aaronsw.com/2002/atx/atx.py">original ATX implementation</a>,
+and it helps prevent things like the following from being parsed as
+headings:</p>
+<pre><code class="language-example">#5 bolt
+
+#hashtag
+.
+&lt;p&gt;#5 bolt&lt;/p&gt;
+&lt;p&gt;#hashtag&lt;/p&gt;
+</code></pre>
+<p>This is not a heading, because the first <code>#</code> is escaped:</p>
+<pre><code class="language-example">\## foo
+.
+&lt;p&gt;## foo&lt;/p&gt;
+</code></pre>
+<p>Contents are parsed as inlines:</p>
+<pre><code class="language-example"># foo *bar* \*baz\*
+.
+&lt;h1&gt;foo &lt;em&gt;bar&lt;/em&gt; *baz*&lt;/h1&gt;
+</code></pre>
+<p>Leading and trailing spaces or tabs are ignored in parsing inline content:</p>
+<pre><code class="language-example">#                  foo                     
+.
+&lt;h1&gt;foo&lt;/h1&gt;
+</code></pre>
+<p>Up to three spaces of indentation are allowed:</p>
+<pre><code class="language-example"> ### foo
+  ## foo
+   # foo
+.
+&lt;h3&gt;foo&lt;/h3&gt;
+&lt;h2&gt;foo&lt;/h2&gt;
+&lt;h1&gt;foo&lt;/h1&gt;
+</code></pre>
+<p>Four spaces of indentation is too many:</p>
+<pre><code class="language-example">    # foo
+.
+&lt;pre&gt;&lt;code&gt;# foo
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">foo
+    # bar
+.
+&lt;p&gt;foo
+# bar&lt;/p&gt;
+</code></pre>
+<p>A closing sequence of <code>#</code> characters is optional:</p>
+<pre><code class="language-example">## foo ##
+  ###   bar    ###
+.
+&lt;h2&gt;foo&lt;/h2&gt;
+&lt;h3&gt;bar&lt;/h3&gt;
+</code></pre>
+<p>It need not be the same length as the opening sequence:</p>
+<pre><code class="language-example"># foo ##################################
+##### foo ##
+.
+&lt;h1&gt;foo&lt;/h1&gt;
+&lt;h5&gt;foo&lt;/h5&gt;
+</code></pre>
+<p>Spaces or tabs are allowed after the closing sequence:</p>
+<pre><code class="language-example">### foo ###     
+.
+&lt;h3&gt;foo&lt;/h3&gt;
+</code></pre>
+<p>A sequence of <code>#</code> characters with anything but spaces or tabs following it
+is not a closing sequence, but counts as part of the contents of the
+heading:</p>
+<pre><code class="language-example">### foo ### b
+.
+&lt;h3&gt;foo ### b&lt;/h3&gt;
+</code></pre>
+<p>The closing sequence must be preceded by a space or tab:</p>
+<pre><code class="language-example"># foo#
+.
+&lt;h1&gt;foo#&lt;/h1&gt;
+</code></pre>
+<p>Backslash-escaped <code>#</code> characters do not count as part
+of the closing sequence:</p>
+<pre><code class="language-example">### foo \###
+## foo #\##
+# foo \#
+.
+&lt;h3&gt;foo ###&lt;/h3&gt;
+&lt;h2&gt;foo ###&lt;/h2&gt;
+&lt;h1&gt;foo #&lt;/h1&gt;
+</code></pre>
+<p>ATX headings need not be separated from surrounding content by blank
+lines, and they can interrupt paragraphs:</p>
+<pre><code class="language-example">****
+## foo
+****
+.
+&lt;hr /&gt;
+&lt;h2&gt;foo&lt;/h2&gt;
+&lt;hr /&gt;
+</code></pre>
+<pre><code class="language-example">Foo bar
+# baz
+Bar foo
+.
+&lt;p&gt;Foo bar&lt;/p&gt;
+&lt;h1&gt;baz&lt;/h1&gt;
+&lt;p&gt;Bar foo&lt;/p&gt;
+</code></pre>
+<p>ATX headings can be empty:</p>
+<pre><code class="language-example">## 
+#
+### ###
+.
+&lt;h2&gt;&lt;/h2&gt;
+&lt;h1&gt;&lt;/h1&gt;
+&lt;h3&gt;&lt;/h3&gt;
+</code></pre>
+<h2>Setext headings</h2>
+<p>A <a href="@">setext heading</a> consists of one or more
+lines of text, not interrupted by a blank line, of which the first line does not
+have more than 3 spaces of indentation, followed by
+a [setext heading underline].  The lines of text must be such
+that, were they not followed by the setext heading underline,
+they would be interpreted as a paragraph:  they cannot be
+interpretable as a [code fence], [ATX heading][ATX headings],
+[block quote][block quotes], [thematic break][thematic breaks],
+[list item][list items], or [HTML block][HTML blocks].</p>
+<p>A <a href="@">setext heading underline</a> is a sequence of
+<code>=</code> characters or a sequence of <code>-</code> characters, with no more than 3
+spaces of indentation and any number of trailing spaces or tabs.  If a line
+containing a single <code>-</code> can be interpreted as an
+empty [list items], it should be interpreted this way
+and not as a [setext heading underline].</p>
+<p>The heading is a level 1 heading if <code>=</code> characters are used in
+the [setext heading underline], and a level 2 heading if <code>-</code>
+characters are used.  The contents of the heading are the result
+of parsing the preceding lines of text as CommonMark inline
+content.</p>
+<p>In general, a setext heading need not be preceded or followed by a
+blank line.  However, it cannot interrupt a paragraph, so when a
+setext heading comes after a paragraph, a blank line is needed between
+them.</p>
+<p>Simple examples:</p>
+<pre><code class="language-example">Foo *bar*
+=========
+
+Foo *bar*
+---------
+.
+&lt;h1&gt;Foo &lt;em&gt;bar&lt;/em&gt;&lt;/h1&gt;
+&lt;h2&gt;Foo &lt;em&gt;bar&lt;/em&gt;&lt;/h2&gt;
+</code></pre>
+<p>The content of the header may span more than one line:</p>
+<pre><code class="language-example">Foo *bar
+baz*
+====
+.
+&lt;h1&gt;Foo &lt;em&gt;bar
+baz&lt;/em&gt;&lt;/h1&gt;
+</code></pre>
+<p>The contents are the result of parsing the headings's raw
+content as inlines.  The heading's raw content is formed by
+concatenating the lines and removing initial and final
+spaces or tabs.</p>
+<pre><code class="language-example">  Foo *bar
+baz*→
+====
+.
+&lt;h1&gt;Foo &lt;em&gt;bar
+baz&lt;/em&gt;&lt;/h1&gt;
+</code></pre>
+<p>The underlining can be any length:</p>
+<pre><code class="language-example">Foo
+-------------------------
+
+Foo
+=
+.
+&lt;h2&gt;Foo&lt;/h2&gt;
+&lt;h1&gt;Foo&lt;/h1&gt;
+</code></pre>
+<p>The heading content can be preceded by up to three spaces of indentation, and
+need not line up with the underlining:</p>
+<pre><code class="language-example">   Foo
+---
+
+  Foo
+-----
+
+  Foo
+  ===
+.
+&lt;h2&gt;Foo&lt;/h2&gt;
+&lt;h2&gt;Foo&lt;/h2&gt;
+&lt;h1&gt;Foo&lt;/h1&gt;
+</code></pre>
+<p>Four spaces of indentation is too many:</p>
+<pre><code class="language-example">    Foo
+    ---
+
+    Foo
+---
+.
+&lt;pre&gt;&lt;code&gt;Foo
+---
+
+Foo
+&lt;/code&gt;&lt;/pre&gt;
+&lt;hr /&gt;
+</code></pre>
+<p>The setext heading underline can be preceded by up to three spaces of
+indentation, and may have trailing spaces or tabs:</p>
+<pre><code class="language-example">Foo
+   ----      
+.
+&lt;h2&gt;Foo&lt;/h2&gt;
+</code></pre>
+<p>Four spaces of indentation is too many:</p>
+<pre><code class="language-example">Foo
+    ---
+.
+&lt;p&gt;Foo
+---&lt;/p&gt;
+</code></pre>
+<p>The setext heading underline cannot contain internal spaces or tabs:</p>
+<pre><code class="language-example">Foo
+= =
+
+Foo
+--- -
+.
+&lt;p&gt;Foo
+= =&lt;/p&gt;
+&lt;p&gt;Foo&lt;/p&gt;
+&lt;hr /&gt;
+</code></pre>
+<p>Trailing spaces or tabs in the content line do not cause a hard line break:</p>
+<pre><code class="language-example">Foo  
+-----
+.
+&lt;h2&gt;Foo&lt;/h2&gt;
+</code></pre>
+<p>Nor does a backslash at the end:</p>
+<pre><code class="language-example">Foo\
+----
+.
+&lt;h2&gt;Foo\&lt;/h2&gt;
+</code></pre>
+<p>Since indicators of block structure take precedence over
+indicators of inline structure, the following are setext headings:</p>
+<pre><code class="language-example">`Foo
+----
+`
+
+&lt;a title=&quot;a lot
+---
+of dashes&quot;/&gt;
+.
+&lt;h2&gt;`Foo&lt;/h2&gt;
+&lt;p&gt;`&lt;/p&gt;
+&lt;h2&gt;&amp;lt;a title=&amp;quot;a lot&lt;/h2&gt;
+&lt;p&gt;of dashes&amp;quot;/&amp;gt;&lt;/p&gt;
+</code></pre>
+<p>The setext heading underline cannot be a [lazy continuation
+line] in a list item or block quote:</p>
+<pre><code class="language-example">&gt; Foo
+---
+.
+&lt;blockquote&gt;
+&lt;p&gt;Foo&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;hr /&gt;
+</code></pre>
+<pre><code class="language-example">&gt; foo
+bar
+===
+.
+&lt;blockquote&gt;
+&lt;p&gt;foo
+bar
+===&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<pre><code class="language-example">- Foo
+---
+.
+&lt;ul&gt;
+&lt;li&gt;Foo&lt;/li&gt;
+&lt;/ul&gt;
+&lt;hr /&gt;
+</code></pre>
+<p>A blank line is needed between a paragraph and a following
+setext heading, since otherwise the paragraph becomes part
+of the heading's content:</p>
+<pre><code class="language-example">Foo
+Bar
+---
+.
+&lt;h2&gt;Foo
+Bar&lt;/h2&gt;
+</code></pre>
+<p>But in general a blank line is not required before or after
+setext headings:</p>
+<pre><code class="language-example">---
+Foo
+---
+Bar
+---
+Baz
+.
+&lt;hr /&gt;
+&lt;h2&gt;Foo&lt;/h2&gt;
+&lt;h2&gt;Bar&lt;/h2&gt;
+&lt;p&gt;Baz&lt;/p&gt;
+</code></pre>
+<p>Setext headings cannot be empty:</p>
+<pre><code class="language-example">
+====
+.
+&lt;p&gt;====&lt;/p&gt;
+</code></pre>
+<p>Setext heading text lines must not be interpretable as block
+constructs other than paragraphs.  So, the line of dashes
+in these examples gets interpreted as a thematic break:</p>
+<pre><code class="language-example">---
+---
+.
+&lt;hr /&gt;
+&lt;hr /&gt;
+</code></pre>
+<pre><code class="language-example">- foo
+-----
+.
+&lt;ul&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;/ul&gt;
+&lt;hr /&gt;
+</code></pre>
+<pre><code class="language-example">    foo
+---
+.
+&lt;pre&gt;&lt;code&gt;foo
+&lt;/code&gt;&lt;/pre&gt;
+&lt;hr /&gt;
+</code></pre>
+<pre><code class="language-example">&gt; foo
+-----
+.
+&lt;blockquote&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;hr /&gt;
+</code></pre>
+<p>If you want a heading with <code>&gt; foo</code> as its literal text, you can
+use backslash escapes:</p>
+<pre><code class="language-example">\&gt; foo
+------
+.
+&lt;h2&gt;&amp;gt; foo&lt;/h2&gt;
+</code></pre>
+<p><strong>Compatibility note:</strong>  Most existing Markdown implementations
+do not allow the text of setext headings to span multiple lines.
+But there is no consensus about how to interpret</p>
+<pre><code class="language-markdown">Foo
+bar
+---
+baz
+</code></pre>
+<p>One can find four different interpretations:</p>
+<ol>
+<li>paragraph &quot;Foo&quot;, heading &quot;bar&quot;, paragraph &quot;baz&quot;</li>
+<li>paragraph &quot;Foo bar&quot;, thematic break, paragraph &quot;baz&quot;</li>
+<li>paragraph &quot;Foo bar --- baz&quot;</li>
+<li>heading &quot;Foo bar&quot;, paragraph &quot;baz&quot;</li>
+</ol>
+<p>We find interpretation 4 most natural, and interpretation 4
+increases the expressive power of CommonMark, by allowing
+multiline headings.  Authors who want interpretation 1 can
+put a blank line after the first paragraph:</p>
+<pre><code class="language-example">Foo
+
+bar
+---
+baz
+.
+&lt;p&gt;Foo&lt;/p&gt;
+&lt;h2&gt;bar&lt;/h2&gt;
+&lt;p&gt;baz&lt;/p&gt;
+</code></pre>
+<p>Authors who want interpretation 2 can put blank lines around
+the thematic break,</p>
+<pre><code class="language-example">Foo
+bar
+
+---
+
+baz
+.
+&lt;p&gt;Foo
+bar&lt;/p&gt;
+&lt;hr /&gt;
+&lt;p&gt;baz&lt;/p&gt;
+</code></pre>
+<p>or use a thematic break that cannot count as a [setext heading
+underline], such as</p>
+<pre><code class="language-example">Foo
+bar
+* * *
+baz
+.
+&lt;p&gt;Foo
+bar&lt;/p&gt;
+&lt;hr /&gt;
+&lt;p&gt;baz&lt;/p&gt;
+</code></pre>
+<p>Authors who want interpretation 3 can use backslash escapes:</p>
+<pre><code class="language-example">Foo
+bar
+\---
+baz
+.
+&lt;p&gt;Foo
+bar
+---
+baz&lt;/p&gt;
+</code></pre>
+<h2>Indented code blocks</h2>
+<p>An <a href="@">indented code block</a> is composed of one or more
+[indented chunks] separated by blank lines.
+An <a href="@">indented chunk</a> is a sequence of non-blank lines,
+each preceded by four or more spaces of indentation. The contents of the code
+block are the literal contents of the lines, including trailing
+[line endings], minus four spaces of indentation.
+An indented code block has no [info string].</p>
+<p>An indented code block cannot interrupt a paragraph, so there must be
+a blank line between a paragraph and a following indented code block.
+(A blank line is not needed, however, between a code block and a following
+paragraph.)</p>
+<pre><code class="language-example">    a simple
+      indented code block
+.
+&lt;pre&gt;&lt;code&gt;a simple
+  indented code block
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>If there is any ambiguity between an interpretation of indentation
+as a code block and as indicating that material belongs to a [list
+item][list items], the list item interpretation takes precedence:</p>
+<pre><code class="language-example">  - foo
+
+    bar
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;p&gt;bar&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<pre><code class="language-example">1.  foo
+
+    - bar
+.
+&lt;ol&gt;
+&lt;li&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;ul&gt;
+&lt;li&gt;bar&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>The contents of a code block are literal text, and do not get parsed
+as Markdown:</p>
+<pre><code class="language-example">    &lt;a/&gt;
+    *hi*
+
+    - one
+.
+&lt;pre&gt;&lt;code&gt;&amp;lt;a/&amp;gt;
+*hi*
+
+- one
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>Here we have three chunks separated by blank lines:</p>
+<pre><code class="language-example">    chunk1
+
+    chunk2
+  
+ 
+ 
+    chunk3
+.
+&lt;pre&gt;&lt;code&gt;chunk1
+
+chunk2
+
+
+
+chunk3
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>Any initial spaces or tabs beyond four spaces of indentation will be included in
+the content, even in interior blank lines:</p>
+<pre><code class="language-example">    chunk1
+      
+      chunk2
+.
+&lt;pre&gt;&lt;code&gt;chunk1
+  
+  chunk2
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>An indented code block cannot interrupt a paragraph.  (This
+allows hanging indents and the like.)</p>
+<pre><code class="language-example">Foo
+    bar
+
+.
+&lt;p&gt;Foo
+bar&lt;/p&gt;
+</code></pre>
+<p>However, any non-blank line with fewer than four spaces of indentation ends
+the code block immediately.  So a paragraph may occur immediately
+after indented code:</p>
+<pre><code class="language-example">    foo
+bar
+.
+&lt;pre&gt;&lt;code&gt;foo
+&lt;/code&gt;&lt;/pre&gt;
+&lt;p&gt;bar&lt;/p&gt;
+</code></pre>
+<p>And indented code can occur immediately before and after other kinds of
+blocks:</p>
+<pre><code class="language-example"># Heading
+    foo
+Heading
+------
+    foo
+----
+.
+&lt;h1&gt;Heading&lt;/h1&gt;
+&lt;pre&gt;&lt;code&gt;foo
+&lt;/code&gt;&lt;/pre&gt;
+&lt;h2&gt;Heading&lt;/h2&gt;
+&lt;pre&gt;&lt;code&gt;foo
+&lt;/code&gt;&lt;/pre&gt;
+&lt;hr /&gt;
+</code></pre>
+<p>The first line can be preceded by more than four spaces of indentation:</p>
+<pre><code class="language-example">        foo
+    bar
+.
+&lt;pre&gt;&lt;code&gt;    foo
+bar
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>Blank lines preceding or following an indented code block
+are not included in it:</p>
+<pre><code class="language-example">
+    
+    foo
+    
+
+.
+&lt;pre&gt;&lt;code&gt;foo
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>Trailing spaces or tabs are included in the code block's content:</p>
+<pre><code class="language-example">    foo  
+.
+&lt;pre&gt;&lt;code&gt;foo  
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<h2>Fenced code blocks</h2>
+<p>A <a href="@">code fence</a> is a sequence
+of at least three consecutive backtick characters (<code>`</code>) or
+tildes (<code>~</code>).  (Tildes and backticks cannot be mixed.)
+A <a href="@">fenced code block</a>
+begins with a code fence, preceded by up to three spaces of indentation.</p>
+<p>The line with the opening code fence may optionally contain some text
+following the code fence; this is trimmed of leading and trailing
+spaces or tabs and called the <a href="@">info string</a>. If the [info string] comes
+after a backtick fence, it may not contain any backtick
+characters.  (The reason for this restriction is that otherwise
+some inline code would be incorrectly interpreted as the
+beginning of a fenced code block.)</p>
+<p>The content of the code block consists of all subsequent lines, until
+a closing [code fence] of the same type as the code block
+began with (backticks or tildes), and with at least as many backticks
+or tildes as the opening code fence.  If the leading code fence is
+preceded by N spaces of indentation, then up to N spaces of indentation are
+removed from each line of the content (if present).  (If a content line is not
+indented, it is preserved unchanged.  If it is indented N spaces or less, all
+of the indentation is removed.)</p>
+<p>The closing code fence may be preceded by up to three spaces of indentation, and
+may be followed only by spaces or tabs, which are ignored.  If the end of the
+containing block (or document) is reached and no closing code fence
+has been found, the code block contains all of the lines after the
+opening code fence until the end of the containing block (or
+document).  (An alternative spec would require backtracking in the
+event that a closing code fence is not found.  But this makes parsing
+much less efficient, and there seems to be no real down side to the
+behavior described here.)</p>
+<p>A fenced code block may interrupt a paragraph, and does not require
+a blank line either before or after.</p>
+<p>The content of a code fence is treated as literal text, not parsed
+as inlines.  The first word of the [info string] is typically used to
+specify the language of the code sample, and rendered in the <code>class</code>
+attribute of the <code>code</code> tag.  However, this spec does not mandate any
+particular treatment of the [info string].</p>
+<p>Here is a simple example with backticks:</p>
+<pre><code class="language-example">```
+&lt;
+ &gt;
+```
+.
+&lt;pre&gt;&lt;code&gt;&amp;lt;
+ &amp;gt;
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>With tildes:</p>
+<pre><code class="language-example">~~~
+&lt;
+ &gt;
+~~~
+.
+&lt;pre&gt;&lt;code&gt;&amp;lt;
+ &amp;gt;
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>Fewer than three backticks is not enough:</p>
+<pre><code class="language-example">``
+foo
+``
+.
+&lt;p&gt;&lt;code&gt;foo&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<p>The closing code fence must use the same character as the opening
+fence:</p>
+<pre><code class="language-example">```
+aaa
+~~~
+```
+.
+&lt;pre&gt;&lt;code&gt;aaa
+~~~
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">~~~
+aaa
+```
+~~~
+.
+&lt;pre&gt;&lt;code&gt;aaa
+```
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>The closing code fence must be at least as long as the opening fence:</p>
+<pre><code class="language-example">````
+aaa
+```
+``````
+.
+&lt;pre&gt;&lt;code&gt;aaa
+```
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">~~~~
+aaa
+~~~
+~~~~
+.
+&lt;pre&gt;&lt;code&gt;aaa
+~~~
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>Unclosed code blocks are closed by the end of the document
+(or the enclosing [block quote][block quotes] or [list item][list items]):</p>
+<pre><code class="language-example">```
+.
+&lt;pre&gt;&lt;code&gt;&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">`````
+
+```
+aaa
+.
+&lt;pre&gt;&lt;code&gt;
+```
+aaa
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">&gt; ```
+&gt; aaa
+
+bbb
+.
+&lt;blockquote&gt;
+&lt;pre&gt;&lt;code&gt;aaa
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/blockquote&gt;
+&lt;p&gt;bbb&lt;/p&gt;
+</code></pre>
+<p>A code block can have all empty lines as its content:</p>
+<pre><code class="language-example">```
+
+  
+```
+.
+&lt;pre&gt;&lt;code&gt;
+  
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>A code block can be empty:</p>
+<pre><code class="language-example">```
+```
+.
+&lt;pre&gt;&lt;code&gt;&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>Fences can be indented.  If the opening fence is indented,
+content lines will have equivalent opening indentation removed,
+if present:</p>
+<pre><code class="language-example"> ```
+ aaa
+aaa
+```
+.
+&lt;pre&gt;&lt;code&gt;aaa
+aaa
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">  ```
+aaa
+  aaa
+aaa
+  ```
+.
+&lt;pre&gt;&lt;code&gt;aaa
+aaa
+aaa
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">   ```
+   aaa
+    aaa
+  aaa
+   ```
+.
+&lt;pre&gt;&lt;code&gt;aaa
+ aaa
+aaa
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>Four spaces of indentation is too many:</p>
+<pre><code class="language-example">    ```
+    aaa
+    ```
+.
+&lt;pre&gt;&lt;code&gt;```
+aaa
+```
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>Closing fences may be preceded by up to three spaces of indentation, and their
+indentation need not match that of the opening fence:</p>
+<pre><code class="language-example">```
+aaa
+  ```
+.
+&lt;pre&gt;&lt;code&gt;aaa
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">   ```
+aaa
+  ```
+.
+&lt;pre&gt;&lt;code&gt;aaa
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>This is not a closing fence, because it is indented 4 spaces:</p>
+<pre><code class="language-example">```
+aaa
+    ```
+.
+&lt;pre&gt;&lt;code&gt;aaa
+    ```
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>Code fences (opening and closing) cannot contain internal spaces or tabs:</p>
+<pre><code class="language-example">``` ```
+aaa
+.
+&lt;p&gt;&lt;code&gt; &lt;/code&gt;
+aaa&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">~~~~~~
+aaa
+~~~ ~~
+.
+&lt;pre&gt;&lt;code&gt;aaa
+~~~ ~~
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>Fenced code blocks can interrupt paragraphs, and can be followed
+directly by paragraphs, without a blank line between:</p>
+<pre><code class="language-example">foo
+```
+bar
+```
+baz
+.
+&lt;p&gt;foo&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;bar
+&lt;/code&gt;&lt;/pre&gt;
+&lt;p&gt;baz&lt;/p&gt;
+</code></pre>
+<p>Other blocks can also occur before and after fenced code blocks
+without an intervening blank line:</p>
+<pre><code class="language-example">foo
+---
+~~~
+bar
+~~~
+# baz
+.
+&lt;h2&gt;foo&lt;/h2&gt;
+&lt;pre&gt;&lt;code&gt;bar
+&lt;/code&gt;&lt;/pre&gt;
+&lt;h1&gt;baz&lt;/h1&gt;
+</code></pre>
+<p>An [info string] can be provided after the opening code fence.
+Although this spec doesn't mandate any particular treatment of
+the info string, the first word is typically used to specify
+the language of the code block. In HTML output, the language is
+normally indicated by adding a class to the <code>code</code> element consisting
+of <code>language-</code> followed by the language name.</p>
+<pre><code class="language-example">```ruby
+def foo(x)
+  return 3
+end
+```
+.
+&lt;pre&gt;&lt;code class=&quot;language-ruby&quot;&gt;def foo(x)
+  return 3
+end
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">~~~~    ruby startline=3 $%@#$
+def foo(x)
+  return 3
+end
+~~~~~~~
+.
+&lt;pre&gt;&lt;code class=&quot;language-ruby&quot;&gt;def foo(x)
+  return 3
+end
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">````;
+````
+.
+&lt;pre&gt;&lt;code class=&quot;language-;&quot;&gt;&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>[Info strings] for backtick code blocks cannot contain backticks:</p>
+<pre><code class="language-example">``` aa ```
+foo
+.
+&lt;p&gt;&lt;code&gt;aa&lt;/code&gt;
+foo&lt;/p&gt;
+</code></pre>
+<p>[Info strings] for tilde code blocks can contain backticks and tildes:</p>
+<pre><code class="language-example">~~~ aa ``` ~~~
+foo
+~~~
+.
+&lt;pre&gt;&lt;code class=&quot;language-aa&quot;&gt;foo
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>Closing code fences cannot have [info strings]:</p>
+<pre><code class="language-example">```
+``` aaa
+```
+.
+&lt;pre&gt;&lt;code&gt;``` aaa
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<h2>HTML blocks</h2>
+<p>An <a href="@">HTML block</a> is a group of lines that is treated
+as raw HTML (and will not be escaped in HTML output).</p>
+<p>There are seven kinds of [HTML block], which can be defined by their
+start and end conditions.  The block begins with a line that meets a
+<a href="@">start condition</a> (after up to three optional spaces of indentation).
+It ends with the first subsequent line that meets a matching
+<a href="@">end condition</a>, or the last line of the document, or the last line of
+the <a href="#container-blocks">container block</a> containing the current HTML
+block, if no line is encountered that meets the [end condition].  If
+the first line meets both the [start condition] and the [end
+condition], the block will contain just that line.</p>
+<ol>
+<li>
+<p><strong>Start condition:</strong>  line begins with the string <code>&lt;pre</code>,
+<code>&lt;script</code>, <code>&lt;style</code>, or <code>&lt;textarea</code> (case-insensitive), followed by a space,
+a tab, the string <code>&gt;</code>, or the end of the line.<br />
+<strong>End condition:</strong>  line contains an end tag
+<code>&lt;/pre&gt;</code>, <code>&lt;/script&gt;</code>, <code>&lt;/style&gt;</code>, or <code>&lt;/textarea&gt;</code> (case-insensitive; it
+need not match the start tag).</p>
+</li>
+<li>
+<p><strong>Start condition:</strong> line begins with the string <code>&lt;!--</code>.<br />
+<strong>End condition:</strong>  line contains the string <code>--&gt;</code>.</p>
+</li>
+<li>
+<p><strong>Start condition:</strong> line begins with the string <code>&lt;?</code>.<br />
+<strong>End condition:</strong> line contains the string <code>?&gt;</code>.</p>
+</li>
+<li>
+<p><strong>Start condition:</strong> line begins with the string <code>&lt;!</code>
+followed by an ASCII letter.<br />
+<strong>End condition:</strong> line contains the character <code>&gt;</code>.</p>
+</li>
+<li>
+<p><strong>Start condition:</strong>  line begins with the string
+<code>&lt;![CDATA[</code>.<br />
+<strong>End condition:</strong> line contains the string <code>]]&gt;</code>.</p>
+</li>
+<li>
+<p><strong>Start condition:</strong> line begins the string <code>&lt;</code> or <code>&lt;/</code>
+followed by one of the strings (case-insensitive) <code>address</code>,
+<code>article</code>, <code>aside</code>, <code>base</code>, <code>basefont</code>, <code>blockquote</code>, <code>body</code>,
+<code>caption</code>, <code>center</code>, <code>col</code>, <code>colgroup</code>, <code>dd</code>, <code>details</code>, <code>dialog</code>,
+<code>dir</code>, <code>div</code>, <code>dl</code>, <code>dt</code>, <code>fieldset</code>, <code>figcaption</code>, <code>figure</code>,
+<code>footer</code>, <code>form</code>, <code>frame</code>, <code>frameset</code>,
+<code>h1</code>, <code>h2</code>, <code>h3</code>, <code>h4</code>, <code>h5</code>, <code>h6</code>, <code>head</code>, <code>header</code>, <code>hr</code>,
+<code>html</code>, <code>iframe</code>, <code>legend</code>, <code>li</code>, <code>link</code>, <code>main</code>, <code>menu</code>, <code>menuitem</code>,
+<code>nav</code>, <code>noframes</code>, <code>ol</code>, <code>optgroup</code>, <code>option</code>, <code>p</code>, <code>param</code>,
+<code>section</code>, <code>source</code>, <code>summary</code>, <code>table</code>, <code>tbody</code>, <code>td</code>,
+<code>tfoot</code>, <code>th</code>, <code>thead</code>, <code>title</code>, <code>tr</code>, <code>track</code>, <code>ul</code>, followed
+by a space, a tab, the end of the line, the string <code>&gt;</code>, or
+the string <code>/&gt;</code>.<br />
+<strong>End condition:</strong> line is followed by a [blank line].</p>
+</li>
+<li>
+<p><strong>Start condition:</strong>  line begins with a complete [open tag]
+(with any [tag name] other than <code>pre</code>, <code>script</code>,
+<code>style</code>, or <code>textarea</code>) or a complete [closing tag],
+followed by zero or more spaces and tabs, followed by the end of the line.<br />
+<strong>End condition:</strong> line is followed by a [blank line].</p>
+</li>
+</ol>
+<p>HTML blocks continue until they are closed by their appropriate
+[end condition], or the last line of the document or other <a href="#container-blocks">container
+block</a>.  This means any HTML <strong>within an HTML
+block</strong> that might otherwise be recognised as a start condition will
+be ignored by the parser and passed through as-is, without changing
+the parser's state.</p>
+<p>For instance, <code>&lt;pre&gt;</code> within an HTML block started by <code>&lt;table&gt;</code> will not affect
+the parser state; as the HTML block was started in by start condition 6, it
+will end at any blank line. This can be surprising:</p>
+<pre><code class="language-example">&lt;table&gt;&lt;tr&gt;&lt;td&gt;
+&lt;pre&gt;
+**Hello**,
+
+_world_.
+&lt;/pre&gt;
+&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
+.
+&lt;table&gt;&lt;tr&gt;&lt;td&gt;
+&lt;pre&gt;
+**Hello**,
+&lt;p&gt;&lt;em&gt;world&lt;/em&gt;.
+&lt;/pre&gt;&lt;/p&gt;
+&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
+</code></pre>
+<p>In this case, the HTML block is terminated by the blank line — the <code>**Hello**</code>
+text remains verbatim — and regular parsing resumes, with a paragraph,
+emphasised <code>world</code> and inline and block HTML following.</p>
+<p>All types of [HTML blocks] except type 7 may interrupt
+a paragraph.  Blocks of type 7 may not interrupt a paragraph.
+(This restriction is intended to prevent unwanted interpretation
+of long tags inside a wrapped paragraph as starting HTML blocks.)</p>
+<p>Some simple examples follow.  Here are some basic HTML blocks
+of type 6:</p>
+<pre><code class="language-example">&lt;table&gt;
+  &lt;tr&gt;
+    &lt;td&gt;
+           hi
+    &lt;/td&gt;
+  &lt;/tr&gt;
+&lt;/table&gt;
+
+okay.
+.
+&lt;table&gt;
+  &lt;tr&gt;
+    &lt;td&gt;
+           hi
+    &lt;/td&gt;
+  &lt;/tr&gt;
+&lt;/table&gt;
+&lt;p&gt;okay.&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example"> &lt;div&gt;
+  *hello*
+         &lt;foo&gt;&lt;a&gt;
+.
+ &lt;div&gt;
+  *hello*
+         &lt;foo&gt;&lt;a&gt;
+</code></pre>
+<p>A block can also start with a closing tag:</p>
+<pre><code class="language-example">&lt;/div&gt;
+*foo*
+.
+&lt;/div&gt;
+*foo*
+</code></pre>
+<p>Here we have two HTML blocks with a Markdown paragraph between them:</p>
+<pre><code class="language-example">&lt;DIV CLASS=&quot;foo&quot;&gt;
+
+*Markdown*
+
+&lt;/DIV&gt;
+.
+&lt;DIV CLASS=&quot;foo&quot;&gt;
+&lt;p&gt;&lt;em&gt;Markdown&lt;/em&gt;&lt;/p&gt;
+&lt;/DIV&gt;
+</code></pre>
+<p>The tag on the first line can be partial, as long
+as it is split where there would be whitespace:</p>
+<pre><code class="language-example">&lt;div id=&quot;foo&quot;
+  class=&quot;bar&quot;&gt;
+&lt;/div&gt;
+.
+&lt;div id=&quot;foo&quot;
+  class=&quot;bar&quot;&gt;
+&lt;/div&gt;
+</code></pre>
+<pre><code class="language-example">&lt;div id=&quot;foo&quot; class=&quot;bar
+  baz&quot;&gt;
+&lt;/div&gt;
+.
+&lt;div id=&quot;foo&quot; class=&quot;bar
+  baz&quot;&gt;
+&lt;/div&gt;
+</code></pre>
+<p>An open tag need not be closed:</p>
+<pre><code class="language-example">&lt;div&gt;
+*foo*
+
+*bar*
+.
+&lt;div&gt;
+*foo*
+&lt;p&gt;&lt;em&gt;bar&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>A partial tag need not even be completed (garbage
+in, garbage out):</p>
+<pre><code class="language-example">&lt;div id=&quot;foo&quot;
+*hi*
+.
+&lt;div id=&quot;foo&quot;
+*hi*
+</code></pre>
+<pre><code class="language-example">&lt;div class
+foo
+.
+&lt;div class
+foo
+</code></pre>
+<p>The initial tag doesn't even need to be a valid
+tag, as long as it starts like one:</p>
+<pre><code class="language-example">&lt;div *???-&amp;&amp;&amp;-&lt;---
+*foo*
+.
+&lt;div *???-&amp;&amp;&amp;-&lt;---
+*foo*
+</code></pre>
+<p>In type 6 blocks, the initial tag need not be on a line by
+itself:</p>
+<pre><code class="language-example">&lt;div&gt;&lt;a href=&quot;bar&quot;&gt;*foo*&lt;/a&gt;&lt;/div&gt;
+.
+&lt;div&gt;&lt;a href=&quot;bar&quot;&gt;*foo*&lt;/a&gt;&lt;/div&gt;
+</code></pre>
+<pre><code class="language-example">&lt;table&gt;&lt;tr&gt;&lt;td&gt;
+foo
+&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
+.
+&lt;table&gt;&lt;tr&gt;&lt;td&gt;
+foo
+&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
+</code></pre>
+<p>Everything until the next blank line or end of document
+gets included in the HTML block.  So, in the following
+example, what looks like a Markdown code block
+is actually part of the HTML block, which continues until a blank
+line or the end of the document is reached:</p>
+<pre><code class="language-example">&lt;div&gt;&lt;/div&gt;
+``` c
+int x = 33;
+```
+.
+&lt;div&gt;&lt;/div&gt;
+``` c
+int x = 33;
+```
+</code></pre>
+<p>To start an [HTML block] with a tag that is <em>not</em> in the
+list of block-level tags in (6), you must put the tag by
+itself on the first line (and it must be complete):</p>
+<pre><code class="language-example">&lt;a href=&quot;foo&quot;&gt;
+*bar*
+&lt;/a&gt;
+.
+&lt;a href=&quot;foo&quot;&gt;
+*bar*
+&lt;/a&gt;
+</code></pre>
+<p>In type 7 blocks, the [tag name] can be anything:</p>
+<pre><code class="language-example">&lt;Warning&gt;
+*bar*
+&lt;/Warning&gt;
+.
+&lt;Warning&gt;
+*bar*
+&lt;/Warning&gt;
+</code></pre>
+<pre><code class="language-example">&lt;i class=&quot;foo&quot;&gt;
+*bar*
+&lt;/i&gt;
+.
+&lt;i class=&quot;foo&quot;&gt;
+*bar*
+&lt;/i&gt;
+</code></pre>
+<pre><code class="language-example">&lt;/ins&gt;
+*bar*
+.
+&lt;/ins&gt;
+*bar*
+</code></pre>
+<p>These rules are designed to allow us to work with tags that
+can function as either block-level or inline-level tags.
+The <code>&lt;del&gt;</code> tag is a nice example.  We can surround content with
+<code>&lt;del&gt;</code> tags in three different ways.  In this case, we get a raw
+HTML block, because the <code>&lt;del&gt;</code> tag is on a line by itself:</p>
+<pre><code class="language-example">&lt;del&gt;
+*foo*
+&lt;/del&gt;
+.
+&lt;del&gt;
+*foo*
+&lt;/del&gt;
+</code></pre>
+<p>In this case, we get a raw HTML block that just includes
+the <code>&lt;del&gt;</code> tag (because it ends with the following blank
+line).  So the contents get interpreted as CommonMark:</p>
+<pre><code class="language-example">&lt;del&gt;
+
+*foo*
+
+&lt;/del&gt;
+.
+&lt;del&gt;
+&lt;p&gt;&lt;em&gt;foo&lt;/em&gt;&lt;/p&gt;
+&lt;/del&gt;
+</code></pre>
+<p>Finally, in this case, the <code>&lt;del&gt;</code> tags are interpreted
+as [raw HTML] <em>inside</em> the CommonMark paragraph.  (Because
+the tag is not on a line by itself, we get inline HTML
+rather than an [HTML block].)</p>
+<pre><code class="language-example">&lt;del&gt;*foo*&lt;/del&gt;
+.
+&lt;p&gt;&lt;del&gt;&lt;em&gt;foo&lt;/em&gt;&lt;/del&gt;&lt;/p&gt;
+</code></pre>
+<p>HTML tags designed to contain literal content
+(<code>pre</code>, <code>script</code>, <code>style</code>, <code>textarea</code>), comments, processing instructions,
+and declarations are treated somewhat differently.
+Instead of ending at the first blank line, these blocks
+end at the first line containing a corresponding end tag.
+As a result, these blocks can contain blank lines:</p>
+<p>A pre tag (type 1):</p>
+<pre><code class="language-example">&lt;pre language=&quot;haskell&quot;&gt;&lt;code&gt;
+import Text.HTML.TagSoup
+
+main :: IO ()
+main = print $ parseTags tags
+&lt;/code&gt;&lt;/pre&gt;
+okay
+.
+&lt;pre language=&quot;haskell&quot;&gt;&lt;code&gt;
+import Text.HTML.TagSoup
+
+main :: IO ()
+main = print $ parseTags tags
+&lt;/code&gt;&lt;/pre&gt;
+&lt;p&gt;okay&lt;/p&gt;
+</code></pre>
+<p>A script tag (type 1):</p>
+<pre><code class="language-example">&lt;script type=&quot;text/javascript&quot;&gt;
+// JavaScript example
+
+document.getElementById(&quot;demo&quot;).innerHTML = &quot;Hello JavaScript!&quot;;
+&lt;/script&gt;
+okay
+.
+&lt;script type=&quot;text/javascript&quot;&gt;
+// JavaScript example
+
+document.getElementById(&quot;demo&quot;).innerHTML = &quot;Hello JavaScript!&quot;;
+&lt;/script&gt;
+&lt;p&gt;okay&lt;/p&gt;
+</code></pre>
+<p>A textarea tag (type 1):</p>
+<pre><code class="language-example">&lt;textarea&gt;
+
+*foo*
+
+_bar_
+
+&lt;/textarea&gt;
+.
+&lt;textarea&gt;
+
+*foo*
+
+_bar_
+
+&lt;/textarea&gt;
+</code></pre>
+<p>A style tag (type 1):</p>
+<pre><code class="language-example">&lt;style
+  type=&quot;text/css&quot;&gt;
+h1 {color:red;}
+
+p {color:blue;}
+&lt;/style&gt;
+okay
+.
+&lt;style
+  type=&quot;text/css&quot;&gt;
+h1 {color:red;}
+
+p {color:blue;}
+&lt;/style&gt;
+&lt;p&gt;okay&lt;/p&gt;
+</code></pre>
+<p>If there is no matching end tag, the block will end at the
+end of the document (or the enclosing [block quote][block quotes]
+or [list item][list items]):</p>
+<pre><code class="language-example">&lt;style
+  type=&quot;text/css&quot;&gt;
+
+foo
+.
+&lt;style
+  type=&quot;text/css&quot;&gt;
+
+foo
+</code></pre>
+<pre><code class="language-example">&gt; &lt;div&gt;
+&gt; foo
+
+bar
+.
+&lt;blockquote&gt;
+&lt;div&gt;
+foo
+&lt;/blockquote&gt;
+&lt;p&gt;bar&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">- &lt;div&gt;
+- foo
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;div&gt;
+&lt;/li&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>The end tag can occur on the same line as the start tag:</p>
+<pre><code class="language-example">&lt;style&gt;p{color:red;}&lt;/style&gt;
+*foo*
+.
+&lt;style&gt;p{color:red;}&lt;/style&gt;
+&lt;p&gt;&lt;em&gt;foo&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&lt;!-- foo --&gt;*bar*
+*baz*
+.
+&lt;!-- foo --&gt;*bar*
+&lt;p&gt;&lt;em&gt;baz&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>Note that anything on the last line after the
+end tag will be included in the [HTML block]:</p>
+<pre><code class="language-example">&lt;script&gt;
+foo
+&lt;/script&gt;1. *bar*
+.
+&lt;script&gt;
+foo
+&lt;/script&gt;1. *bar*
+</code></pre>
+<p>A comment (type 2):</p>
+<pre><code class="language-example">&lt;!-- Foo
+
+bar
+   baz --&gt;
+okay
+.
+&lt;!-- Foo
+
+bar
+   baz --&gt;
+&lt;p&gt;okay&lt;/p&gt;
+</code></pre>
+<p>A processing instruction (type 3):</p>
+<pre><code class="language-example">&lt;?php
+
+  echo '&gt;';
+
+?&gt;
+okay
+.
+&lt;?php
+
+  echo '&gt;';
+
+?&gt;
+&lt;p&gt;okay&lt;/p&gt;
+</code></pre>
+<p>A declaration (type 4):</p>
+<pre><code class="language-example">&lt;!DOCTYPE html&gt;
+.
+&lt;!DOCTYPE html&gt;
+</code></pre>
+<p>CDATA (type 5):</p>
+<pre><code class="language-example">&lt;![CDATA[
+function matchwo(a,b)
+{
+  if (a &lt; b &amp;&amp; a &lt; 0) then {
+    return 1;
+
+  } else {
+
+    return 0;
+  }
+}
+]]&gt;
+okay
+.
+&lt;![CDATA[
+function matchwo(a,b)
+{
+  if (a &lt; b &amp;&amp; a &lt; 0) then {
+    return 1;
+
+  } else {
+
+    return 0;
+  }
+}
+]]&gt;
+&lt;p&gt;okay&lt;/p&gt;
+</code></pre>
+<p>The opening tag can be preceded by up to three spaces of indentation, but not
+four:</p>
+<pre><code class="language-example">  &lt;!-- foo --&gt;
+
+    &lt;!-- foo --&gt;
+.
+  &lt;!-- foo --&gt;
+&lt;pre&gt;&lt;code&gt;&amp;lt;!-- foo --&amp;gt;
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">  &lt;div&gt;
+
+    &lt;div&gt;
+.
+  &lt;div&gt;
+&lt;pre&gt;&lt;code&gt;&amp;lt;div&amp;gt;
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>An HTML block of types 1--6 can interrupt a paragraph, and need not be
+preceded by a blank line.</p>
+<pre><code class="language-example">Foo
+&lt;div&gt;
+bar
+&lt;/div&gt;
+.
+&lt;p&gt;Foo&lt;/p&gt;
+&lt;div&gt;
+bar
+&lt;/div&gt;
+</code></pre>
+<p>However, a following blank line is needed, except at the end of
+a document, and except for blocks of types 1--5, [above][HTML
+block]:</p>
+<pre><code class="language-example">&lt;div&gt;
+bar
+&lt;/div&gt;
+*foo*
+.
+&lt;div&gt;
+bar
+&lt;/div&gt;
+*foo*
+</code></pre>
+<p>HTML blocks of type 7 cannot interrupt a paragraph:</p>
+<pre><code class="language-example">Foo
+&lt;a href=&quot;bar&quot;&gt;
+baz
+.
+&lt;p&gt;Foo
+&lt;a href=&quot;bar&quot;&gt;
+baz&lt;/p&gt;
+</code></pre>
+<p>This rule differs from John Gruber's original Markdown syntax
+specification, which says:</p>
+<blockquote>
+<p>The only restrictions are that block-level HTML elements —
+e.g. <code>&lt;div&gt;</code>, <code>&lt;table&gt;</code>, <code>&lt;pre&gt;</code>, <code>&lt;p&gt;</code>, etc. — must be separated from
+surrounding content by blank lines, and the start and end tags of the
+block should not be indented with spaces or tabs.</p>
+</blockquote>
+<p>In some ways Gruber's rule is more restrictive than the one given
+here:</p>
+<ul>
+<li>It requires that an HTML block be preceded by a blank line.</li>
+<li>It does not allow the start tag to be indented.</li>
+<li>It requires a matching end tag, which it also does not allow to
+be indented.</li>
+</ul>
+<p>Most Markdown implementations (including some of Gruber's own) do not
+respect all of these restrictions.</p>
+<p>There is one respect, however, in which Gruber's rule is more liberal
+than the one given here, since it allows blank lines to occur inside
+an HTML block.  There are two reasons for disallowing them here.
+First, it removes the need to parse balanced tags, which is
+expensive and can require backtracking from the end of the document
+if no matching end tag is found. Second, it provides a very simple
+and flexible way of including Markdown content inside HTML tags:
+simply separate the Markdown from the HTML using blank lines:</p>
+<p>Compare:</p>
+<pre><code class="language-example">&lt;div&gt;
+
+*Emphasized* text.
+
+&lt;/div&gt;
+.
+&lt;div&gt;
+&lt;p&gt;&lt;em&gt;Emphasized&lt;/em&gt; text.&lt;/p&gt;
+&lt;/div&gt;
+</code></pre>
+<pre><code class="language-example">&lt;div&gt;
+*Emphasized* text.
+&lt;/div&gt;
+.
+&lt;div&gt;
+*Emphasized* text.
+&lt;/div&gt;
+</code></pre>
+<p>Some Markdown implementations have adopted a convention of
+interpreting content inside tags as text if the open tag has
+the attribute <code>markdown=1</code>.  The rule given above seems a simpler and
+more elegant way of achieving the same expressive power, which is also
+much simpler to parse.</p>
+<p>The main potential drawback is that one can no longer paste HTML
+blocks into Markdown documents with 100% reliability.  However,
+<em>in most cases</em> this will work fine, because the blank lines in
+HTML are usually followed by HTML block tags.  For example:</p>
+<pre><code class="language-example">&lt;table&gt;
+
+&lt;tr&gt;
+
+&lt;td&gt;
+Hi
+&lt;/td&gt;
+
+&lt;/tr&gt;
+
+&lt;/table&gt;
+.
+&lt;table&gt;
+&lt;tr&gt;
+&lt;td&gt;
+Hi
+&lt;/td&gt;
+&lt;/tr&gt;
+&lt;/table&gt;
+</code></pre>
+<p>There are problems, however, if the inner tags are indented
+<em>and</em> separated by spaces, as then they will be interpreted as
+an indented code block:</p>
+<pre><code class="language-example">&lt;table&gt;
+
+  &lt;tr&gt;
+
+    &lt;td&gt;
+      Hi
+    &lt;/td&gt;
+
+  &lt;/tr&gt;
+
+&lt;/table&gt;
+.
+&lt;table&gt;
+  &lt;tr&gt;
+&lt;pre&gt;&lt;code&gt;&amp;lt;td&amp;gt;
+  Hi
+&amp;lt;/td&amp;gt;
+&lt;/code&gt;&lt;/pre&gt;
+  &lt;/tr&gt;
+&lt;/table&gt;
+</code></pre>
+<p>Fortunately, blank lines are usually not necessary and can be
+deleted.  The exception is inside <code>&lt;pre&gt;</code> tags, but as described
+[above][HTML blocks], raw HTML blocks starting with <code>&lt;pre&gt;</code>
+<em>can</em> contain blank lines.</p>
+<h2>Link reference definitions</h2>
+<p>A <a href="@">link reference definition</a>
+consists of a [link label], optionally preceded by up to three spaces of
+indentation, followed
+by a colon (<code>:</code>), optional spaces or tabs (including up to one
+[line ending]), a [link destination],
+optional spaces or tabs (including up to one
+[line ending]), and an optional [link
+title], which if it is present must be separated
+from the [link destination] by spaces or tabs.
+No further character may occur.</p>
+<p>A [link reference definition]
+does not correspond to a structural element of a document.  Instead, it
+defines a label which can be used in [reference links]
+and reference-style [images] elsewhere in the document.  [Link
+reference definitions] can come either before or after the links that use
+them.</p>
+<pre><code class="language-example">[foo]: /url &quot;title&quot;
+
+[foo]
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">   [foo]: 
+      /url  
+           'the title'  
+
+[foo]
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot; title=&quot;the title&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[Foo*bar\]]:my_(url) 'title (with parens)'
+
+[Foo*bar\]]
+.
+&lt;p&gt;&lt;a href=&quot;my_(url)&quot; title=&quot;title (with parens)&quot;&gt;Foo*bar]&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[Foo bar]:
+&lt;my url&gt;
+'title'
+
+[Foo bar]
+.
+&lt;p&gt;&lt;a href=&quot;my%20url&quot; title=&quot;title&quot;&gt;Foo bar&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>The title may extend over multiple lines:</p>
+<pre><code class="language-example">[foo]: /url '
+title
+line1
+line2
+'
+
+[foo]
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot; title=&quot;
+title
+line1
+line2
+&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>However, it may not contain a [blank line]:</p>
+<pre><code class="language-example">[foo]: /url 'title
+
+with blank line'
+
+[foo]
+.
+&lt;p&gt;[foo]: /url 'title&lt;/p&gt;
+&lt;p&gt;with blank line'&lt;/p&gt;
+&lt;p&gt;[foo]&lt;/p&gt;
+</code></pre>
+<p>The title may be omitted:</p>
+<pre><code class="language-example">[foo]:
+/url
+
+[foo]
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>The link destination may not be omitted:</p>
+<pre><code class="language-example">[foo]:
+
+[foo]
+.
+&lt;p&gt;[foo]:&lt;/p&gt;
+&lt;p&gt;[foo]&lt;/p&gt;
+</code></pre>
+<p>However, an empty link destination may be specified using
+angle brackets:</p>
+<pre><code class="language-example">[foo]: &lt;&gt;
+
+[foo]
+.
+&lt;p&gt;&lt;a href=&quot;&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>The title must be separated from the link destination by
+spaces or tabs:</p>
+<pre><code class="language-example">[foo]: &lt;bar&gt;(baz)
+
+[foo]
+.
+&lt;p&gt;[foo]: &lt;bar&gt;(baz)&lt;/p&gt;
+&lt;p&gt;[foo]&lt;/p&gt;
+</code></pre>
+<p>Both title and destination can contain backslash escapes
+and literal backslashes:</p>
+<pre><code class="language-example">[foo]: /url\bar\*baz &quot;foo\&quot;bar\baz&quot;
+
+[foo]
+.
+&lt;p&gt;&lt;a href=&quot;/url%5Cbar*baz&quot; title=&quot;foo&amp;quot;bar\baz&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>A link can come before its corresponding definition:</p>
+<pre><code class="language-example">[foo]
+
+[foo]: url
+.
+&lt;p&gt;&lt;a href=&quot;url&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>If there are several matching definitions, the first one takes
+precedence:</p>
+<pre><code class="language-example">[foo]
+
+[foo]: first
+[foo]: second
+.
+&lt;p&gt;&lt;a href=&quot;first&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>As noted in the section on [Links], matching of labels is
+case-insensitive (see [matches]).</p>
+<pre><code class="language-example">[FOO]: /url
+
+[Foo]
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot;&gt;Foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[ΑΓΩ]: /φου
+
+[αγω]
+.
+&lt;p&gt;&lt;a href=&quot;/%CF%86%CE%BF%CF%85&quot;&gt;αγω&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Whether something is a [link reference definition] is
+independent of whether the link reference it defines is
+used in the document.  Thus, for example, the following
+document contains just a link reference definition, and
+no visible content:</p>
+<pre><code class="language-example">[foo]: /url
+.
+</code></pre>
+<p>Here is another one:</p>
+<pre><code class="language-example">[
+foo
+]: /url
+bar
+.
+&lt;p&gt;bar&lt;/p&gt;
+</code></pre>
+<p>This is not a link reference definition, because there are
+characters other than spaces or tabs after the title:</p>
+<pre><code class="language-example">[foo]: /url &quot;title&quot; ok
+.
+&lt;p&gt;[foo]: /url &amp;quot;title&amp;quot; ok&lt;/p&gt;
+</code></pre>
+<p>This is a link reference definition, but it has no title:</p>
+<pre><code class="language-example">[foo]: /url
+&quot;title&quot; ok
+.
+&lt;p&gt;&amp;quot;title&amp;quot; ok&lt;/p&gt;
+</code></pre>
+<p>This is not a link reference definition, because it is indented
+four spaces:</p>
+<pre><code class="language-example">    [foo]: /url &quot;title&quot;
+
+[foo]
+.
+&lt;pre&gt;&lt;code&gt;[foo]: /url &amp;quot;title&amp;quot;
+&lt;/code&gt;&lt;/pre&gt;
+&lt;p&gt;[foo]&lt;/p&gt;
+</code></pre>
+<p>This is not a link reference definition, because it occurs inside
+a code block:</p>
+<pre><code class="language-example">```
+[foo]: /url
+```
+
+[foo]
+.
+&lt;pre&gt;&lt;code&gt;[foo]: /url
+&lt;/code&gt;&lt;/pre&gt;
+&lt;p&gt;[foo]&lt;/p&gt;
+</code></pre>
+<p>A [link reference definition] cannot interrupt a paragraph.</p>
+<pre><code class="language-example">Foo
+[bar]: /baz
+
+[bar]
+.
+&lt;p&gt;Foo
+[bar]: /baz&lt;/p&gt;
+&lt;p&gt;[bar]&lt;/p&gt;
+</code></pre>
+<p>However, it can directly follow other block elements, such as headings
+and thematic breaks, and it need not be followed by a blank line.</p>
+<pre><code class="language-example"># [Foo]
+[foo]: /url
+&gt; bar
+.
+&lt;h1&gt;&lt;a href=&quot;/url&quot;&gt;Foo&lt;/a&gt;&lt;/h1&gt;
+&lt;blockquote&gt;
+&lt;p&gt;bar&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<pre><code class="language-example">[foo]: /url
+bar
+===
+[foo]
+.
+&lt;h1&gt;bar&lt;/h1&gt;
+&lt;p&gt;&lt;a href=&quot;/url&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo]: /url
+===
+[foo]
+.
+&lt;p&gt;===
+&lt;a href=&quot;/url&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Several [link reference definitions]
+can occur one after another, without intervening blank lines.</p>
+<pre><code class="language-example">[foo]: /foo-url &quot;foo&quot;
+[bar]: /bar-url
+  &quot;bar&quot;
+[baz]: /baz-url
+
+[foo],
+[bar],
+[baz]
+.
+&lt;p&gt;&lt;a href=&quot;/foo-url&quot; title=&quot;foo&quot;&gt;foo&lt;/a&gt;,
+&lt;a href=&quot;/bar-url&quot; title=&quot;bar&quot;&gt;bar&lt;/a&gt;,
+&lt;a href=&quot;/baz-url&quot;&gt;baz&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>[Link reference definitions] can occur
+inside block containers, like lists and block quotations.  They
+affect the entire document, not just the container in which they
+are defined:</p>
+<pre><code class="language-example">[foo]
+
+&gt; [foo]: /url
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+&lt;blockquote&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<h2>Paragraphs</h2>
+<p>A sequence of non-blank lines that cannot be interpreted as other
+kinds of blocks forms a <a href="@">paragraph</a>.
+The contents of the paragraph are the result of parsing the
+paragraph's raw content as inlines.  The paragraph's raw content
+is formed by concatenating the lines and removing initial and final
+spaces or tabs.</p>
+<p>A simple example with two paragraphs:</p>
+<pre><code class="language-example">aaa
+
+bbb
+.
+&lt;p&gt;aaa&lt;/p&gt;
+&lt;p&gt;bbb&lt;/p&gt;
+</code></pre>
+<p>Paragraphs can contain multiple lines, but no blank lines:</p>
+<pre><code class="language-example">aaa
+bbb
+
+ccc
+ddd
+.
+&lt;p&gt;aaa
+bbb&lt;/p&gt;
+&lt;p&gt;ccc
+ddd&lt;/p&gt;
+</code></pre>
+<p>Multiple blank lines between paragraphs have no effect:</p>
+<pre><code class="language-example">aaa
+
+
+bbb
+.
+&lt;p&gt;aaa&lt;/p&gt;
+&lt;p&gt;bbb&lt;/p&gt;
+</code></pre>
+<p>Leading spaces or tabs are skipped:</p>
+<pre><code class="language-example">  aaa
+ bbb
+.
+&lt;p&gt;aaa
+bbb&lt;/p&gt;
+</code></pre>
+<p>Lines after the first may be indented any amount, since indented
+code blocks cannot interrupt paragraphs.</p>
+<pre><code class="language-example">aaa
+             bbb
+                                       ccc
+.
+&lt;p&gt;aaa
+bbb
+ccc&lt;/p&gt;
+</code></pre>
+<p>However, the first line may be preceded by up to three spaces of indentation.
+Four spaces of indentation is too many:</p>
+<pre><code class="language-example">   aaa
+bbb
+.
+&lt;p&gt;aaa
+bbb&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">    aaa
+bbb
+.
+&lt;pre&gt;&lt;code&gt;aaa
+&lt;/code&gt;&lt;/pre&gt;
+&lt;p&gt;bbb&lt;/p&gt;
+</code></pre>
+<p>Final spaces or tabs are stripped before inline parsing, so a paragraph
+that ends with two or more spaces will not end with a [hard line
+break]:</p>
+<pre><code class="language-example">aaa     
+bbb     
+.
+&lt;p&gt;aaa&lt;br /&gt;
+bbb&lt;/p&gt;
+</code></pre>
+<h2>Blank lines</h2>
+<p>[Blank lines] between block-level elements are ignored,
+except for the role they play in determining whether a [list]
+is [tight] or [loose].</p>
+<p>Blank lines at the beginning and end of the document are also ignored.</p>
+<pre><code class="language-example">  
+
+aaa
+  
+
+# aaa
+
+  
+.
+&lt;p&gt;aaa&lt;/p&gt;
+&lt;h1&gt;aaa&lt;/h1&gt;
+</code></pre>
+<h1>Container blocks</h1>
+<p>A <a href="#container-blocks">container block</a> is a block that has other
+blocks as its contents.  There are two basic kinds of container blocks:
+[block quotes] and [list items].
+[Lists] are meta-containers for [list items].</p>
+<p>We define the syntax for container blocks recursively.  The general
+form of the definition is:</p>
+<blockquote>
+<p>If X is a sequence of blocks, then the result of
+transforming X in such-and-such a way is a container of type Y
+with these blocks as its content.</p>
+</blockquote>
+<p>So, we explain what counts as a block quote or list item by explaining
+how these can be <em>generated</em> from their contents. This should suffice
+to define the syntax, although it does not give a recipe for <em>parsing</em>
+these constructions.  (A recipe is provided below in the section entitled
+<a href="#appendix-a-parsing-strategy">A parsing strategy</a>.)</p>
+<h2>Block quotes</h2>
+<p>A <a href="@">block quote marker</a>,
+optionally preceded by up to three spaces of indentation,
+consists of (a) the character <code>&gt;</code> together with a following space of
+indentation, or (b) a single character <code>&gt;</code> not followed by a space of
+indentation.</p>
+<p>The following rules define [block quotes]:</p>
+<ol>
+<li>
+<p><strong>Basic case.</strong>  If a string of lines <em>Ls</em> constitute a sequence
+of blocks <em>Bs</em>, then the result of prepending a [block quote
+marker] to the beginning of each line in <em>Ls</em>
+is a <a href="#block-quotes">block quote</a> containing <em>Bs</em>.</p>
+</li>
+<li>
+<p><strong>Laziness.</strong>  If a string of lines <em>Ls</em> constitute a <a href="#block-quotes">block
+quote</a> with contents <em>Bs</em>, then the result of deleting
+the initial [block quote marker] from one or
+more lines in which the next character other than a space or tab after the
+[block quote marker] is [paragraph continuation
+text] is a block quote with <em>Bs</em> as its content.
+<a href="@">Paragraph continuation text</a> is text
+that will be parsed as part of the content of a paragraph, but does
+not occur at the beginning of the paragraph.</p>
+</li>
+<li>
+<p><strong>Consecutiveness.</strong>  A document cannot contain two [block
+quotes] in a row unless there is a [blank line] between them.</p>
+</li>
+</ol>
+<p>Nothing else counts as a <a href="#block-quotes">block quote</a>.</p>
+<p>Here is a simple example:</p>
+<pre><code class="language-example">&gt; # Foo
+&gt; bar
+&gt; baz
+.
+&lt;blockquote&gt;
+&lt;h1&gt;Foo&lt;/h1&gt;
+&lt;p&gt;bar
+baz&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>The space or tab after the <code>&gt;</code> characters can be omitted:</p>
+<pre><code class="language-example">&gt;# Foo
+&gt;bar
+&gt; baz
+.
+&lt;blockquote&gt;
+&lt;h1&gt;Foo&lt;/h1&gt;
+&lt;p&gt;bar
+baz&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>The <code>&gt;</code> characters can be preceded by up to three spaces of indentation:</p>
+<pre><code class="language-example">   &gt; # Foo
+   &gt; bar
+ &gt; baz
+.
+&lt;blockquote&gt;
+&lt;h1&gt;Foo&lt;/h1&gt;
+&lt;p&gt;bar
+baz&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>Four spaces of indentation is too many:</p>
+<pre><code class="language-example">    &gt; # Foo
+    &gt; bar
+    &gt; baz
+.
+&lt;pre&gt;&lt;code&gt;&amp;gt; # Foo
+&amp;gt; bar
+&amp;gt; baz
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>The Laziness clause allows us to omit the <code>&gt;</code> before
+[paragraph continuation text]:</p>
+<pre><code class="language-example">&gt; # Foo
+&gt; bar
+baz
+.
+&lt;blockquote&gt;
+&lt;h1&gt;Foo&lt;/h1&gt;
+&lt;p&gt;bar
+baz&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>A block quote can contain some lazy and some non-lazy
+continuation lines:</p>
+<pre><code class="language-example">&gt; bar
+baz
+&gt; foo
+.
+&lt;blockquote&gt;
+&lt;p&gt;bar
+baz
+foo&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>Laziness only applies to lines that would have been continuations of
+paragraphs had they been prepended with [block quote markers].
+For example, the <code>&gt; </code> cannot be omitted in the second line of</p>
+<pre><code class="language-markdown">&gt; foo
+&gt; ---
+</code></pre>
+<p>without changing the meaning:</p>
+<pre><code class="language-example">&gt; foo
+---
+.
+&lt;blockquote&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;hr /&gt;
+</code></pre>
+<p>Similarly, if we omit the <code>&gt; </code> in the second line of</p>
+<pre><code class="language-markdown">&gt; - foo
+&gt; - bar
+</code></pre>
+<p>then the block quote ends after the first line:</p>
+<pre><code class="language-example">&gt; - foo
+- bar
+.
+&lt;blockquote&gt;
+&lt;ul&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/blockquote&gt;
+&lt;ul&gt;
+&lt;li&gt;bar&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>For the same reason, we can't omit the <code>&gt; </code> in front of
+subsequent lines of an indented or fenced code block:</p>
+<pre><code class="language-example">&gt;     foo
+    bar
+.
+&lt;blockquote&gt;
+&lt;pre&gt;&lt;code&gt;foo
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/blockquote&gt;
+&lt;pre&gt;&lt;code&gt;bar
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">&gt; ```
+foo
+```
+.
+&lt;blockquote&gt;
+&lt;pre&gt;&lt;code&gt;&lt;/code&gt;&lt;/pre&gt;
+&lt;/blockquote&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>Note that in the following case, we have a [lazy
+continuation line]:</p>
+<pre><code class="language-example">&gt; foo
+    - bar
+.
+&lt;blockquote&gt;
+&lt;p&gt;foo
+- bar&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>To see why, note that in</p>
+<pre><code class="language-markdown">&gt; foo
+&gt;     - bar
+</code></pre>
+<p>the <code>- bar</code> is indented too far to start a list, and can't
+be an indented code block because indented code blocks cannot
+interrupt paragraphs, so it is [paragraph continuation text].</p>
+<p>A block quote can be empty:</p>
+<pre><code class="language-example">&gt;
+.
+&lt;blockquote&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<pre><code class="language-example">&gt;
+&gt;  
+&gt; 
+.
+&lt;blockquote&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>A block quote can have initial or final blank lines:</p>
+<pre><code class="language-example">&gt;
+&gt; foo
+&gt;  
+.
+&lt;blockquote&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>A blank line always separates block quotes:</p>
+<pre><code class="language-example">&gt; foo
+
+&gt; bar
+.
+&lt;blockquote&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;blockquote&gt;
+&lt;p&gt;bar&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>(Most current Markdown implementations, including John Gruber's
+original <code>Markdown.pl</code>, will parse this example as a single block quote
+with two paragraphs.  But it seems better to allow the author to decide
+whether two block quotes or one are wanted.)</p>
+<p>Consecutiveness means that if we put these block quotes together,
+we get a single block quote:</p>
+<pre><code class="language-example">&gt; foo
+&gt; bar
+.
+&lt;blockquote&gt;
+&lt;p&gt;foo
+bar&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>To get a block quote with two paragraphs, use:</p>
+<pre><code class="language-example">&gt; foo
+&gt;
+&gt; bar
+.
+&lt;blockquote&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;p&gt;bar&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>Block quotes can interrupt paragraphs:</p>
+<pre><code class="language-example">foo
+&gt; bar
+.
+&lt;p&gt;foo&lt;/p&gt;
+&lt;blockquote&gt;
+&lt;p&gt;bar&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>In general, blank lines are not needed before or after block
+quotes:</p>
+<pre><code class="language-example">&gt; aaa
+***
+&gt; bbb
+.
+&lt;blockquote&gt;
+&lt;p&gt;aaa&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;hr /&gt;
+&lt;blockquote&gt;
+&lt;p&gt;bbb&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>However, because of laziness, a blank line is needed between
+a block quote and a following paragraph:</p>
+<pre><code class="language-example">&gt; bar
+baz
+.
+&lt;blockquote&gt;
+&lt;p&gt;bar
+baz&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<pre><code class="language-example">&gt; bar
+
+baz
+.
+&lt;blockquote&gt;
+&lt;p&gt;bar&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;p&gt;baz&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&gt; bar
+&gt;
+baz
+.
+&lt;blockquote&gt;
+&lt;p&gt;bar&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;p&gt;baz&lt;/p&gt;
+</code></pre>
+<p>It is a consequence of the Laziness rule that any number
+of initial <code>&gt;</code>s may be omitted on a continuation line of a
+nested block quote:</p>
+<pre><code class="language-example">&gt; &gt; &gt; foo
+bar
+.
+&lt;blockquote&gt;
+&lt;blockquote&gt;
+&lt;blockquote&gt;
+&lt;p&gt;foo
+bar&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;/blockquote&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<pre><code class="language-example">&gt;&gt;&gt; foo
+&gt; bar
+&gt;&gt;baz
+.
+&lt;blockquote&gt;
+&lt;blockquote&gt;
+&lt;blockquote&gt;
+&lt;p&gt;foo
+bar
+baz&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;/blockquote&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>When including an indented code block in a block quote,
+remember that the [block quote marker] includes
+both the <code>&gt;</code> and a following space of indentation.  So <em>five spaces</em> are needed
+after the <code>&gt;</code>:</p>
+<pre><code class="language-example">&gt;     code
+
+&gt;    not code
+.
+&lt;blockquote&gt;
+&lt;pre&gt;&lt;code&gt;code
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/blockquote&gt;
+&lt;blockquote&gt;
+&lt;p&gt;not code&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<h2>List items</h2>
+<p>A <a href="@">list marker</a> is a
+[bullet list marker] or an [ordered list marker].</p>
+<p>A <a href="@">bullet list marker</a>
+is a <code>-</code>, <code>+</code>, or <code>*</code> character.</p>
+<p>An <a href="@">ordered list marker</a>
+is a sequence of 1--9 arabic digits (<code>0-9</code>), followed by either a
+<code>.</code> character or a <code>)</code> character.  (The reason for the length
+limit is that with 10 digits we start seeing integer overflows
+in some browsers.)</p>
+<p>The following rules define [list items]:</p>
+<ol>
+<li>
+<p><strong>Basic case.</strong>  If a sequence of lines <em>Ls</em> constitute a sequence of
+blocks <em>Bs</em> starting with a character other than a space or tab, and <em>M</em> is
+a list marker of width <em>W</em> followed by 1 ≤ <em>N</em> ≤ 4 spaces of indentation,
+then the result of prepending <em>M</em> and the following spaces to the first line
+of Ls*, and indenting subsequent lines of <em>Ls</em> by <em>W + N</em> spaces, is a
+list item with <em>Bs</em> as its contents.  The type of the list item
+(bullet or ordered) is determined by the type of its list marker.
+If the list item is ordered, then it is also assigned a start
+number, based on the ordered list marker.</p>
+<p>Exceptions:</p>
+<ol>
+<li>When the first list item in a [list] interrupts
+a paragraph---that is, when it starts on a line that would
+otherwise count as [paragraph continuation text]---then (a)
+the lines <em>Ls</em> must not begin with a blank line, and (b) if
+the list item is ordered, the start number must be 1.</li>
+<li>If any line is a [thematic break][thematic breaks] then
+that line is not a list item.</li>
+</ol>
+</li>
+</ol>
+<p>For example, let <em>Ls</em> be the lines</p>
+<pre><code class="language-example">A paragraph
+with two lines.
+
+    indented code
+
+&gt; A block quote.
+.
+&lt;p&gt;A paragraph
+with two lines.&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;indented code
+&lt;/code&gt;&lt;/pre&gt;
+&lt;blockquote&gt;
+&lt;p&gt;A block quote.&lt;/p&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>And let <em>M</em> be the marker <code>1.</code>, and <em>N</em> = 2.  Then rule #1 says
+that the following is an ordered list item with start number 1,
+and the same contents as <em>Ls</em>:</p>
+<pre><code class="language-example">1.  A paragraph
+    with two lines.
+
+        indented code
+
+    &gt; A block quote.
+.
+&lt;ol&gt;
+&lt;li&gt;
+&lt;p&gt;A paragraph
+with two lines.&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;indented code
+&lt;/code&gt;&lt;/pre&gt;
+&lt;blockquote&gt;
+&lt;p&gt;A block quote.&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>The most important thing to notice is that the position of
+the text after the list marker determines how much indentation
+is needed in subsequent blocks in the list item.  If the list
+marker takes up two spaces of indentation, and there are three spaces between
+the list marker and the next character other than a space or tab, then blocks
+must be indented five spaces in order to fall under the list
+item.</p>
+<p>Here are some examples showing how far content must be indented to be
+put under the list item:</p>
+<pre><code class="language-example">- one
+
+ two
+.
+&lt;ul&gt;
+&lt;li&gt;one&lt;/li&gt;
+&lt;/ul&gt;
+&lt;p&gt;two&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">- one
+
+  two
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;one&lt;/p&gt;
+&lt;p&gt;two&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<pre><code class="language-example"> -    one
+
+     two
+.
+&lt;ul&gt;
+&lt;li&gt;one&lt;/li&gt;
+&lt;/ul&gt;
+&lt;pre&gt;&lt;code&gt; two
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example"> -    one
+
+      two
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;one&lt;/p&gt;
+&lt;p&gt;two&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>It is tempting to think of this in terms of columns:  the continuation
+blocks must be indented at least to the column of the first character other than
+a space or tab after the list marker.  However, that is not quite right.
+The spaces of indentation after the list marker determine how much relative
+indentation is needed.  Which column this indentation reaches will depend on
+how the list item is embedded in other constructions, as shown by
+this example:</p>
+<pre><code class="language-example">   &gt; &gt; 1.  one
+&gt;&gt;
+&gt;&gt;     two
+.
+&lt;blockquote&gt;
+&lt;blockquote&gt;
+&lt;ol&gt;
+&lt;li&gt;
+&lt;p&gt;one&lt;/p&gt;
+&lt;p&gt;two&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+&lt;/blockquote&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>Here <code>two</code> occurs in the same column as the list marker <code>1.</code>,
+but is actually contained in the list item, because there is
+sufficient indentation after the last containing blockquote marker.</p>
+<p>The converse is also possible.  In the following example, the word <code>two</code>
+occurs far to the right of the initial text of the list item, <code>one</code>, but
+it is not considered part of the list item, because it is not indented
+far enough past the blockquote marker:</p>
+<pre><code class="language-example">&gt;&gt;- one
+&gt;&gt;
+  &gt;  &gt; two
+.
+&lt;blockquote&gt;
+&lt;blockquote&gt;
+&lt;ul&gt;
+&lt;li&gt;one&lt;/li&gt;
+&lt;/ul&gt;
+&lt;p&gt;two&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>Note that at least one space or tab is needed between the list marker and
+any following content, so these are not list items:</p>
+<pre><code class="language-example">-one
+
+2.two
+.
+&lt;p&gt;-one&lt;/p&gt;
+&lt;p&gt;2.two&lt;/p&gt;
+</code></pre>
+<p>A list item may contain blocks that are separated by more than
+one blank line.</p>
+<pre><code class="language-example">- foo
+
+
+  bar
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;p&gt;bar&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>A list item may contain any kind of block:</p>
+<pre><code class="language-example">1.  foo
+
+    ```
+    bar
+    ```
+
+    baz
+
+    &gt; bam
+.
+&lt;ol&gt;
+&lt;li&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;bar
+&lt;/code&gt;&lt;/pre&gt;
+&lt;p&gt;baz&lt;/p&gt;
+&lt;blockquote&gt;
+&lt;p&gt;bam&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>A list item that contains an indented code block will preserve
+empty lines within the code block verbatim.</p>
+<pre><code class="language-example">- Foo
+
+      bar
+
+
+      baz
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;Foo&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;bar
+
+
+baz
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>Note that ordered list start numbers must be nine digits or less:</p>
+<pre><code class="language-example">123456789. ok
+.
+&lt;ol start=&quot;123456789&quot;&gt;
+&lt;li&gt;ok&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<pre><code class="language-example">1234567890. not ok
+.
+&lt;p&gt;1234567890. not ok&lt;/p&gt;
+</code></pre>
+<p>A start number may begin with 0s:</p>
+<pre><code class="language-example">0. ok
+.
+&lt;ol start=&quot;0&quot;&gt;
+&lt;li&gt;ok&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<pre><code class="language-example">003. ok
+.
+&lt;ol start=&quot;3&quot;&gt;
+&lt;li&gt;ok&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>A start number may not be negative:</p>
+<pre><code class="language-example">-1. not ok
+.
+&lt;p&gt;-1. not ok&lt;/p&gt;
+</code></pre>
+<ol start="2">
+<li><strong>Item starting with indented code.</strong>  If a sequence of lines <em>Ls</em>
+constitute a sequence of blocks <em>Bs</em> starting with an indented code
+block, and <em>M</em> is a list marker of width <em>W</em> followed by
+one space of indentation, then the result of prepending <em>M</em> and the
+following space to the first line of <em>Ls</em>, and indenting subsequent lines
+of <em>Ls</em> by <em>W + 1</em> spaces, is a list item with <em>Bs</em> as its contents.
+If a line is empty, then it need not be indented.  The type of the
+list item (bullet or ordered) is determined by the type of its list
+marker.  If the list item is ordered, then it is also assigned a
+start number, based on the ordered list marker.</li>
+</ol>
+<p>An indented code block will have to be preceded by four spaces of indentation
+beyond the edge of the region where text will be included in the list item.
+In the following case that is 6 spaces:</p>
+<pre><code class="language-example">- foo
+
+      bar
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;bar
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>And in this case it is 11 spaces:</p>
+<pre><code class="language-example">  10.  foo
+
+           bar
+.
+&lt;ol start=&quot;10&quot;&gt;
+&lt;li&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;bar
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>If the <em>first</em> block in the list item is an indented code block,
+then by rule #2, the contents must be preceded by <em>one</em> space of indentation
+after the list marker:</p>
+<pre><code class="language-example">    indented code
+
+paragraph
+
+    more code
+.
+&lt;pre&gt;&lt;code&gt;indented code
+&lt;/code&gt;&lt;/pre&gt;
+&lt;p&gt;paragraph&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;more code
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<pre><code class="language-example">1.     indented code
+
+   paragraph
+
+       more code
+.
+&lt;ol&gt;
+&lt;li&gt;
+&lt;pre&gt;&lt;code&gt;indented code
+&lt;/code&gt;&lt;/pre&gt;
+&lt;p&gt;paragraph&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;more code
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>Note that an additional space of indentation is interpreted as space
+inside the code block:</p>
+<pre><code class="language-example">1.      indented code
+
+   paragraph
+
+       more code
+.
+&lt;ol&gt;
+&lt;li&gt;
+&lt;pre&gt;&lt;code&gt; indented code
+&lt;/code&gt;&lt;/pre&gt;
+&lt;p&gt;paragraph&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;more code
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>Note that rules #1 and #2 only apply to two cases:  (a) cases
+in which the lines to be included in a list item begin with a
+character other than a space or tab, and (b) cases in which
+they begin with an indented code
+block.  In a case like the following, where the first block begins with
+three spaces of indentation, the rules do not allow us to form a list item by
+indenting the whole thing and prepending a list marker:</p>
+<pre><code class="language-example">   foo
+
+bar
+.
+&lt;p&gt;foo&lt;/p&gt;
+&lt;p&gt;bar&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">-    foo
+
+  bar
+.
+&lt;ul&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;/ul&gt;
+&lt;p&gt;bar&lt;/p&gt;
+</code></pre>
+<p>This is not a significant restriction, because when a block is preceded by up to
+three spaces of indentation, the indentation can always be removed without
+a change in interpretation, allowing rule #1 to be applied.  So, in
+the above case:</p>
+<pre><code class="language-example">-  foo
+
+   bar
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;p&gt;bar&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<ol start="3">
+<li><strong>Item starting with a blank line.</strong>  If a sequence of lines <em>Ls</em>
+starting with a single [blank line] constitute a (possibly empty)
+sequence of blocks <em>Bs</em>, and <em>M</em> is a list marker of width <em>W</em>,
+then the result of prepending <em>M</em> to the first line of <em>Ls</em>, and
+preceding subsequent lines of <em>Ls</em> by <em>W + 1</em> spaces of indentation, is a
+list item with <em>Bs</em> as its contents.
+If a line is empty, then it need not be indented.  The type of the
+list item (bullet or ordered) is determined by the type of its list
+marker.  If the list item is ordered, then it is also assigned a
+start number, based on the ordered list marker.</li>
+</ol>
+<p>Here are some list items that start with a blank line but are not empty:</p>
+<pre><code class="language-example">-
+  foo
+-
+  ```
+  bar
+  ```
+-
+      baz
+.
+&lt;ul&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;li&gt;
+&lt;pre&gt;&lt;code&gt;bar
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/li&gt;
+&lt;li&gt;
+&lt;pre&gt;&lt;code&gt;baz
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>When the list item starts with a blank line, the number of spaces
+following the list marker doesn't change the required indentation:</p>
+<pre><code class="language-example">-   
+  foo
+.
+&lt;ul&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>A list item can begin with at most one blank line.
+In the following example, <code>foo</code> is not part of the list
+item:</p>
+<pre><code class="language-example">-
+
+  foo
+.
+&lt;ul&gt;
+&lt;li&gt;&lt;/li&gt;
+&lt;/ul&gt;
+&lt;p&gt;foo&lt;/p&gt;
+</code></pre>
+<p>Here is an empty bullet list item:</p>
+<pre><code class="language-example">- foo
+-
+- bar
+.
+&lt;ul&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;li&gt;&lt;/li&gt;
+&lt;li&gt;bar&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>It does not matter whether there are spaces or tabs following the [list marker]:</p>
+<pre><code class="language-example">- foo
+-   
+- bar
+.
+&lt;ul&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;li&gt;&lt;/li&gt;
+&lt;li&gt;bar&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>Here is an empty ordered list item:</p>
+<pre><code class="language-example">1. foo
+2.
+3. bar
+.
+&lt;ol&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;li&gt;&lt;/li&gt;
+&lt;li&gt;bar&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>A list may start or end with an empty list item:</p>
+<pre><code class="language-example">*
+.
+&lt;ul&gt;
+&lt;li&gt;&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>However, an empty list item cannot interrupt a paragraph:</p>
+<pre><code class="language-example">foo
+*
+
+foo
+1.
+.
+&lt;p&gt;foo
+*&lt;/p&gt;
+&lt;p&gt;foo
+1.&lt;/p&gt;
+</code></pre>
+<ol start="4">
+<li><strong>Indentation.</strong>  If a sequence of lines <em>Ls</em> constitutes a list item
+according to rule #1, #2, or #3, then the result of preceding each line
+of <em>Ls</em> by up to three spaces of indentation (the same for each line) also
+constitutes a list item with the same contents and attributes.  If a line is
+empty, then it need not be indented.</li>
+</ol>
+<p>Indented one space:</p>
+<pre><code class="language-example"> 1.  A paragraph
+     with two lines.
+
+         indented code
+
+     &gt; A block quote.
+.
+&lt;ol&gt;
+&lt;li&gt;
+&lt;p&gt;A paragraph
+with two lines.&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;indented code
+&lt;/code&gt;&lt;/pre&gt;
+&lt;blockquote&gt;
+&lt;p&gt;A block quote.&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>Indented two spaces:</p>
+<pre><code class="language-example">  1.  A paragraph
+      with two lines.
+
+          indented code
+
+      &gt; A block quote.
+.
+&lt;ol&gt;
+&lt;li&gt;
+&lt;p&gt;A paragraph
+with two lines.&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;indented code
+&lt;/code&gt;&lt;/pre&gt;
+&lt;blockquote&gt;
+&lt;p&gt;A block quote.&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>Indented three spaces:</p>
+<pre><code class="language-example">   1.  A paragraph
+       with two lines.
+
+           indented code
+
+       &gt; A block quote.
+.
+&lt;ol&gt;
+&lt;li&gt;
+&lt;p&gt;A paragraph
+with two lines.&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;indented code
+&lt;/code&gt;&lt;/pre&gt;
+&lt;blockquote&gt;
+&lt;p&gt;A block quote.&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>Four spaces indent gives a code block:</p>
+<pre><code class="language-example">    1.  A paragraph
+        with two lines.
+
+            indented code
+
+        &gt; A block quote.
+.
+&lt;pre&gt;&lt;code&gt;1.  A paragraph
+    with two lines.
+
+        indented code
+
+    &amp;gt; A block quote.
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<ol start="5">
+<li><strong>Laziness.</strong>  If a string of lines <em>Ls</em> constitute a <a href="#list-items">list
+item</a> with contents <em>Bs</em>, then the result of deleting
+some or all of the indentation from one or more lines in which the
+next character other than a space or tab after the indentation is
+[paragraph continuation text] is a
+list item with the same contents and attributes.  The unindented
+lines are called
+<a href="@">lazy continuation line</a>s.</li>
+</ol>
+<p>Here is an example with [lazy continuation lines]:</p>
+<pre><code class="language-example">  1.  A paragraph
+with two lines.
+
+          indented code
+
+      &gt; A block quote.
+.
+&lt;ol&gt;
+&lt;li&gt;
+&lt;p&gt;A paragraph
+with two lines.&lt;/p&gt;
+&lt;pre&gt;&lt;code&gt;indented code
+&lt;/code&gt;&lt;/pre&gt;
+&lt;blockquote&gt;
+&lt;p&gt;A block quote.&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>Indentation can be partially deleted:</p>
+<pre><code class="language-example">  1.  A paragraph
+    with two lines.
+.
+&lt;ol&gt;
+&lt;li&gt;A paragraph
+with two lines.&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>These examples show how laziness can work in nested structures:</p>
+<pre><code class="language-example">&gt; 1. &gt; Blockquote
+continued here.
+.
+&lt;blockquote&gt;
+&lt;ol&gt;
+&lt;li&gt;
+&lt;blockquote&gt;
+&lt;p&gt;Blockquote
+continued here.&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<pre><code class="language-example">&gt; 1. &gt; Blockquote
+&gt; continued here.
+.
+&lt;blockquote&gt;
+&lt;ol&gt;
+&lt;li&gt;
+&lt;blockquote&gt;
+&lt;p&gt;Blockquote
+continued here.&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<ol start="6">
+<li><strong>That's all.</strong> Nothing that is not counted as a list item by rules
+#1--5 counts as a <a href="#list-items">list item</a>.</li>
+</ol>
+<p>The rules for sublists follow from the general rules
+[above][List items].  A sublist must be indented the same number
+of spaces of indentation a paragraph would need to be in order to be included
+in the list item.</p>
+<p>So, in this case we need two spaces indent:</p>
+<pre><code class="language-example">- foo
+  - bar
+    - baz
+      - boo
+.
+&lt;ul&gt;
+&lt;li&gt;foo
+&lt;ul&gt;
+&lt;li&gt;bar
+&lt;ul&gt;
+&lt;li&gt;baz
+&lt;ul&gt;
+&lt;li&gt;boo&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>One is not enough:</p>
+<pre><code class="language-example">- foo
+ - bar
+  - baz
+   - boo
+.
+&lt;ul&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;li&gt;bar&lt;/li&gt;
+&lt;li&gt;baz&lt;/li&gt;
+&lt;li&gt;boo&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>Here we need four, because the list marker is wider:</p>
+<pre><code class="language-example">10) foo
+    - bar
+.
+&lt;ol start=&quot;10&quot;&gt;
+&lt;li&gt;foo
+&lt;ul&gt;
+&lt;li&gt;bar&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>Three is not enough:</p>
+<pre><code class="language-example">10) foo
+   - bar
+.
+&lt;ol start=&quot;10&quot;&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;/ol&gt;
+&lt;ul&gt;
+&lt;li&gt;bar&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>A list may be the first block in a list item:</p>
+<pre><code class="language-example">- - foo
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;ul&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<pre><code class="language-example">1. - 2. foo
+.
+&lt;ol&gt;
+&lt;li&gt;
+&lt;ul&gt;
+&lt;li&gt;
+&lt;ol start=&quot;2&quot;&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;/ol&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>A list item can contain a heading:</p>
+<pre><code class="language-example">- # Foo
+- Bar
+  ---
+  baz
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;h1&gt;Foo&lt;/h1&gt;
+&lt;/li&gt;
+&lt;li&gt;
+&lt;h2&gt;Bar&lt;/h2&gt;
+baz&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<h3>Motivation</h3>
+<p>John Gruber's Markdown spec says the following about list items:</p>
+<ol>
+<li>
+<p>&quot;List markers typically start at the left margin, but may be indented
+by up to three spaces. List markers must be followed by one or more
+spaces or a tab.&quot;</p>
+</li>
+<li>
+<p>&quot;To make lists look nice, you can wrap items with hanging indents....
+But if you don't want to, you don't have to.&quot;</p>
+</li>
+<li>
+<p>&quot;List items may consist of multiple paragraphs. Each subsequent
+paragraph in a list item must be indented by either 4 spaces or one
+tab.&quot;</p>
+</li>
+<li>
+<p>&quot;It looks nice if you indent every line of the subsequent paragraphs,
+but here again, Markdown will allow you to be lazy.&quot;</p>
+</li>
+<li>
+<p>&quot;To put a blockquote within a list item, the blockquote's <code>&gt;</code>
+delimiters need to be indented.&quot;</p>
+</li>
+<li>
+<p>&quot;To put a code block within a list item, the code block needs to be
+indented twice — 8 spaces or two tabs.&quot;</p>
+</li>
+</ol>
+<p>These rules specify that a paragraph under a list item must be indented
+four spaces (presumably, from the left margin, rather than the start of
+the list marker, but this is not said), and that code under a list item
+must be indented eight spaces instead of the usual four.  They also say
+that a block quote must be indented, but not by how much; however, the
+example given has four spaces indentation.  Although nothing is said
+about other kinds of block-level content, it is certainly reasonable to
+infer that <em>all</em> block elements under a list item, including other
+lists, must be indented four spaces.  This principle has been called the
+<em>four-space rule</em>.</p>
+<p>The four-space rule is clear and principled, and if the reference
+implementation <code>Markdown.pl</code> had followed it, it probably would have
+become the standard.  However, <code>Markdown.pl</code> allowed paragraphs and
+sublists to start with only two spaces indentation, at least on the
+outer level.  Worse, its behavior was inconsistent: a sublist of an
+outer-level list needed two spaces indentation, but a sublist of this
+sublist needed three spaces.  It is not surprising, then, that different
+implementations of Markdown have developed very different rules for
+determining what comes under a list item.  (Pandoc and python-Markdown,
+for example, stuck with Gruber's syntax description and the four-space
+rule, while discount, redcarpet, marked, PHP Markdown, and others
+followed <code>Markdown.pl</code>'s behavior more closely.)</p>
+<p>Unfortunately, given the divergences between implementations, there
+is no way to give a spec for list items that will be guaranteed not
+to break any existing documents.  However, the spec given here should
+correctly handle lists formatted with either the four-space rule or
+the more forgiving <code>Markdown.pl</code> behavior, provided they are laid out
+in a way that is natural for a human to read.</p>
+<p>The strategy here is to let the width and indentation of the list marker
+determine the indentation necessary for blocks to fall under the list
+item, rather than having a fixed and arbitrary number.  The writer can
+think of the body of the list item as a unit which gets indented to the
+right enough to fit the list marker (and any indentation on the list
+marker).  (The laziness rule, #5, then allows continuation lines to be
+unindented if needed.)</p>
+<p>This rule is superior, we claim, to any rule requiring a fixed level of
+indentation from the margin.  The four-space rule is clear but
+unnatural. It is quite unintuitive that</p>
+<pre><code class="language-markdown">- foo
+
+  bar
+
+  - baz
+</code></pre>
+<p>should be parsed as two lists with an intervening paragraph,</p>
+<pre><code class="language-html">&lt;ul&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;/ul&gt;
+&lt;p&gt;bar&lt;/p&gt;
+&lt;ul&gt;
+&lt;li&gt;baz&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>as the four-space rule demands, rather than a single list,</p>
+<pre><code class="language-html">&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;p&gt;bar&lt;/p&gt;
+&lt;ul&gt;
+&lt;li&gt;baz&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>The choice of four spaces is arbitrary.  It can be learned, but it is
+not likely to be guessed, and it trips up beginners regularly.</p>
+<p>Would it help to adopt a two-space rule?  The problem is that such
+a rule, together with the rule allowing up to three spaces of indentation for
+the initial list marker, allows text that is indented <em>less than</em> the
+original list marker to be included in the list item. For example,
+<code>Markdown.pl</code> parses</p>
+<pre><code class="language-markdown">   - one
+
+  two
+</code></pre>
+<p>as a single list item, with <code>two</code> a continuation paragraph:</p>
+<pre><code class="language-html">&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;one&lt;/p&gt;
+&lt;p&gt;two&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>and similarly</p>
+<pre><code class="language-markdown">&gt;   - one
+&gt;
+&gt;  two
+</code></pre>
+<p>as</p>
+<pre><code class="language-html">&lt;blockquote&gt;
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;one&lt;/p&gt;
+&lt;p&gt;two&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/blockquote&gt;
+</code></pre>
+<p>This is extremely unintuitive.</p>
+<p>Rather than requiring a fixed indent from the margin, we could require
+a fixed indent (say, two spaces, or even one space) from the list marker (which
+may itself be indented).  This proposal would remove the last anomaly
+discussed.  Unlike the spec presented above, it would count the following
+as a list item with a subparagraph, even though the paragraph <code>bar</code>
+is not indented as far as the first paragraph <code>foo</code>:</p>
+<pre><code class="language-markdown"> 10. foo
+
+   bar  
+</code></pre>
+<p>Arguably this text does read like a list item with <code>bar</code> as a subparagraph,
+which may count in favor of the proposal.  However, on this proposal indented
+code would have to be indented six spaces after the list marker.  And this
+would break a lot of existing Markdown, which has the pattern:</p>
+<pre><code class="language-markdown">1.  foo
+
+        indented code
+</code></pre>
+<p>where the code is indented eight spaces.  The spec above, by contrast, will
+parse this text as expected, since the code block's indentation is measured
+from the beginning of <code>foo</code>.</p>
+<p>The one case that needs special treatment is a list item that <em>starts</em>
+with indented code.  How much indentation is required in that case, since
+we don't have a &quot;first paragraph&quot; to measure from?  Rule #2 simply stipulates
+that in such cases, we require one space indentation from the list marker
+(and then the normal four spaces for the indented code).  This will match the
+four-space rule in cases where the list marker plus its initial indentation
+takes four spaces (a common case), but diverge in other cases.</p>
+<h2>Lists</h2>
+<p>A <a href="@">list</a> is a sequence of one or more
+list items [of the same type].  The list items
+may be separated by any number of blank lines.</p>
+<p>Two list items are <a href="@">of the same type</a>
+if they begin with a [list marker] of the same type.
+Two list markers are of the
+same type if (a) they are bullet list markers using the same character
+(<code>-</code>, <code>+</code>, or <code>*</code>) or (b) they are ordered list numbers with the same
+delimiter (either <code>.</code> or <code>)</code>).</p>
+<p>A list is an <a href="@">ordered list</a>
+if its constituent list items begin with
+[ordered list markers], and a
+<a href="@">bullet list</a> if its constituent list
+items begin with [bullet list markers].</p>
+<p>The <a href="@">start number</a>
+of an [ordered list] is determined by the list number of
+its initial list item.  The numbers of subsequent list items are
+disregarded.</p>
+<p>A list is <a href="@">loose</a> if any of its constituent
+list items are separated by blank lines, or if any of its constituent
+list items directly contain two block-level elements with a blank line
+between them.  Otherwise a list is <a href="@">tight</a>.
+(The difference in HTML output is that paragraphs in a loose list are
+wrapped in <code>&lt;p&gt;</code> tags, while paragraphs in a tight list are not.)</p>
+<p>Changing the bullet or ordered list delimiter starts a new list:</p>
+<pre><code class="language-example">- foo
+- bar
++ baz
+.
+&lt;ul&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;li&gt;bar&lt;/li&gt;
+&lt;/ul&gt;
+&lt;ul&gt;
+&lt;li&gt;baz&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<pre><code class="language-example">1. foo
+2. bar
+3) baz
+.
+&lt;ol&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;li&gt;bar&lt;/li&gt;
+&lt;/ol&gt;
+&lt;ol start=&quot;3&quot;&gt;
+&lt;li&gt;baz&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>In CommonMark, a list can interrupt a paragraph. That is,
+no blank line is needed to separate a paragraph from a following
+list:</p>
+<pre><code class="language-example">Foo
+- bar
+- baz
+.
+&lt;p&gt;Foo&lt;/p&gt;
+&lt;ul&gt;
+&lt;li&gt;bar&lt;/li&gt;
+&lt;li&gt;baz&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p><code>Markdown.pl</code> does not allow this, through fear of triggering a list
+via a numeral in a hard-wrapped line:</p>
+<pre><code class="language-markdown">The number of windows in my house is
+14.  The number of doors is 6.
+</code></pre>
+<p>Oddly, though, <code>Markdown.pl</code> <em>does</em> allow a blockquote to
+interrupt a paragraph, even though the same considerations might
+apply.</p>
+<p>In CommonMark, we do allow lists to interrupt paragraphs, for
+two reasons.  First, it is natural and not uncommon for people
+to start lists without blank lines:</p>
+<pre><code class="language-markdown">I need to buy
+- new shoes
+- a coat
+- a plane ticket
+</code></pre>
+<p>Second, we are attracted to a</p>
+<blockquote>
+<p><a href="@">principle of uniformity</a>:
+if a chunk of text has a certain
+meaning, it will continue to have the same meaning when put into a
+container block (such as a list item or blockquote).</p>
+</blockquote>
+<p>(Indeed, the spec for [list items] and [block quotes] presupposes
+this principle.) This principle implies that if</p>
+<pre><code class="language-markdown">  * I need to buy
+    - new shoes
+    - a coat
+    - a plane ticket
+</code></pre>
+<p>is a list item containing a paragraph followed by a nested sublist,
+as all Markdown implementations agree it is (though the paragraph
+may be rendered without <code>&lt;p&gt;</code> tags, since the list is &quot;tight&quot;),
+then</p>
+<pre><code class="language-markdown">I need to buy
+- new shoes
+- a coat
+- a plane ticket
+</code></pre>
+<p>by itself should be a paragraph followed by a nested sublist.</p>
+<p>Since it is well established Markdown practice to allow lists to
+interrupt paragraphs inside list items, the [principle of
+uniformity] requires us to allow this outside list items as
+well.  (<a href="http://docutils.sourceforge.net/rst.html">reStructuredText</a>
+takes a different approach, requiring blank lines before lists
+even inside other list items.)</p>
+<p>In order to solve of unwanted lists in paragraphs with
+hard-wrapped numerals, we allow only lists starting with <code>1</code> to
+interrupt paragraphs.  Thus,</p>
+<pre><code class="language-example">The number of windows in my house is
+14.  The number of doors is 6.
+.
+&lt;p&gt;The number of windows in my house is
+14.  The number of doors is 6.&lt;/p&gt;
+</code></pre>
+<p>We may still get an unintended result in cases like</p>
+<pre><code class="language-example">The number of windows in my house is
+1.  The number of doors is 6.
+.
+&lt;p&gt;The number of windows in my house is&lt;/p&gt;
+&lt;ol&gt;
+&lt;li&gt;The number of doors is 6.&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>but this rule should prevent most spurious list captures.</p>
+<p>There can be any number of blank lines between items:</p>
+<pre><code class="language-example">- foo
+
+- bar
+
+
+- baz
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;/li&gt;
+&lt;li&gt;
+&lt;p&gt;bar&lt;/p&gt;
+&lt;/li&gt;
+&lt;li&gt;
+&lt;p&gt;baz&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<pre><code class="language-example">- foo
+  - bar
+    - baz
+
+
+      bim
+.
+&lt;ul&gt;
+&lt;li&gt;foo
+&lt;ul&gt;
+&lt;li&gt;bar
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;baz&lt;/p&gt;
+&lt;p&gt;bim&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>To separate consecutive lists of the same type, or to separate a
+list from an indented code block that would otherwise be parsed
+as a subparagraph of the final list item, you can insert a blank HTML
+comment:</p>
+<pre><code class="language-example">- foo
+- bar
+
+&lt;!-- --&gt;
+
+- baz
+- bim
+.
+&lt;ul&gt;
+&lt;li&gt;foo&lt;/li&gt;
+&lt;li&gt;bar&lt;/li&gt;
+&lt;/ul&gt;
+&lt;!-- --&gt;
+&lt;ul&gt;
+&lt;li&gt;baz&lt;/li&gt;
+&lt;li&gt;bim&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<pre><code class="language-example">-   foo
+
+    notcode
+
+-   foo
+
+&lt;!-- --&gt;
+
+    code
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;p&gt;notcode&lt;/p&gt;
+&lt;/li&gt;
+&lt;li&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+&lt;!-- --&gt;
+&lt;pre&gt;&lt;code&gt;code
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>List items need not be indented to the same level.  The following
+list items will be treated as items at the same list level,
+since none is indented enough to belong to the previous list
+item:</p>
+<pre><code class="language-example">- a
+ - b
+  - c
+   - d
+  - e
+ - f
+- g
+.
+&lt;ul&gt;
+&lt;li&gt;a&lt;/li&gt;
+&lt;li&gt;b&lt;/li&gt;
+&lt;li&gt;c&lt;/li&gt;
+&lt;li&gt;d&lt;/li&gt;
+&lt;li&gt;e&lt;/li&gt;
+&lt;li&gt;f&lt;/li&gt;
+&lt;li&gt;g&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<pre><code class="language-example">1. a
+
+  2. b
+
+   3. c
+.
+&lt;ol&gt;
+&lt;li&gt;
+&lt;p&gt;a&lt;/p&gt;
+&lt;/li&gt;
+&lt;li&gt;
+&lt;p&gt;b&lt;/p&gt;
+&lt;/li&gt;
+&lt;li&gt;
+&lt;p&gt;c&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>Note, however, that list items may not be preceded by more than
+three spaces of indentation.  Here <code>- e</code> is treated as a paragraph continuation
+line, because it is indented more than three spaces:</p>
+<pre><code class="language-example">- a
+ - b
+  - c
+   - d
+    - e
+.
+&lt;ul&gt;
+&lt;li&gt;a&lt;/li&gt;
+&lt;li&gt;b&lt;/li&gt;
+&lt;li&gt;c&lt;/li&gt;
+&lt;li&gt;d
+- e&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>And here, <code>3. c</code> is treated as in indented code block,
+because it is indented four spaces and preceded by a
+blank line.</p>
+<pre><code class="language-example">1. a
+
+  2. b
+
+    3. c
+.
+&lt;ol&gt;
+&lt;li&gt;
+&lt;p&gt;a&lt;/p&gt;
+&lt;/li&gt;
+&lt;li&gt;
+&lt;p&gt;b&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+&lt;pre&gt;&lt;code&gt;3. c
+&lt;/code&gt;&lt;/pre&gt;
+</code></pre>
+<p>This is a loose list, because there is a blank line between
+two of the list items:</p>
+<pre><code class="language-example">- a
+- b
+
+- c
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;a&lt;/p&gt;
+&lt;/li&gt;
+&lt;li&gt;
+&lt;p&gt;b&lt;/p&gt;
+&lt;/li&gt;
+&lt;li&gt;
+&lt;p&gt;c&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>So is this, with a empty second item:</p>
+<pre><code class="language-example">* a
+*
+
+* c
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;a&lt;/p&gt;
+&lt;/li&gt;
+&lt;li&gt;&lt;/li&gt;
+&lt;li&gt;
+&lt;p&gt;c&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>These are loose lists, even though there are no blank lines between the items,
+because one of the items directly contains two block-level elements
+with a blank line between them:</p>
+<pre><code class="language-example">- a
+- b
+
+  c
+- d
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;a&lt;/p&gt;
+&lt;/li&gt;
+&lt;li&gt;
+&lt;p&gt;b&lt;/p&gt;
+&lt;p&gt;c&lt;/p&gt;
+&lt;/li&gt;
+&lt;li&gt;
+&lt;p&gt;d&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<pre><code class="language-example">- a
+- b
+
+  [ref]: /url
+- d
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;a&lt;/p&gt;
+&lt;/li&gt;
+&lt;li&gt;
+&lt;p&gt;b&lt;/p&gt;
+&lt;/li&gt;
+&lt;li&gt;
+&lt;p&gt;d&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>This is a tight list, because the blank lines are in a code block:</p>
+<pre><code class="language-example">- a
+- ```
+  b
+
+
+  ```
+- c
+.
+&lt;ul&gt;
+&lt;li&gt;a&lt;/li&gt;
+&lt;li&gt;
+&lt;pre&gt;&lt;code&gt;b
+
+
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/li&gt;
+&lt;li&gt;c&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>This is a tight list, because the blank line is between two
+paragraphs of a sublist.  So the sublist is loose while
+the outer list is tight:</p>
+<pre><code class="language-example">- a
+  - b
+
+    c
+- d
+.
+&lt;ul&gt;
+&lt;li&gt;a
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;b&lt;/p&gt;
+&lt;p&gt;c&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;li&gt;d&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>This is a tight list, because the blank line is inside the
+block quote:</p>
+<pre><code class="language-example">* a
+  &gt; b
+  &gt;
+* c
+.
+&lt;ul&gt;
+&lt;li&gt;a
+&lt;blockquote&gt;
+&lt;p&gt;b&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;/li&gt;
+&lt;li&gt;c&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>This list is tight, because the consecutive block elements
+are not separated by blank lines:</p>
+<pre><code class="language-example">- a
+  &gt; b
+  ```
+  c
+  ```
+- d
+.
+&lt;ul&gt;
+&lt;li&gt;a
+&lt;blockquote&gt;
+&lt;p&gt;b&lt;/p&gt;
+&lt;/blockquote&gt;
+&lt;pre&gt;&lt;code&gt;c
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/li&gt;
+&lt;li&gt;d&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>A single-paragraph list is tight:</p>
+<pre><code class="language-example">- a
+.
+&lt;ul&gt;
+&lt;li&gt;a&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<pre><code class="language-example">- a
+  - b
+.
+&lt;ul&gt;
+&lt;li&gt;a
+&lt;ul&gt;
+&lt;li&gt;b&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<p>This list is loose, because of the blank line between the
+two block elements in the list item:</p>
+<pre><code class="language-example">1. ```
+   foo
+   ```
+
+   bar
+.
+&lt;ol&gt;
+&lt;li&gt;
+&lt;pre&gt;&lt;code&gt;foo
+&lt;/code&gt;&lt;/pre&gt;
+&lt;p&gt;bar&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ol&gt;
+</code></pre>
+<p>Here the outer list is loose, the inner list tight:</p>
+<pre><code class="language-example">* foo
+  * bar
+
+  baz
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;foo&lt;/p&gt;
+&lt;ul&gt;
+&lt;li&gt;bar&lt;/li&gt;
+&lt;/ul&gt;
+&lt;p&gt;baz&lt;/p&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<pre><code class="language-example">- a
+  - b
+  - c
+
+- d
+  - e
+  - f
+.
+&lt;ul&gt;
+&lt;li&gt;
+&lt;p&gt;a&lt;/p&gt;
+&lt;ul&gt;
+&lt;li&gt;b&lt;/li&gt;
+&lt;li&gt;c&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;li&gt;
+&lt;p&gt;d&lt;/p&gt;
+&lt;ul&gt;
+&lt;li&gt;e&lt;/li&gt;
+&lt;li&gt;f&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/li&gt;
+&lt;/ul&gt;
+</code></pre>
+<h1>Inlines</h1>
+<p>Inlines are parsed sequentially from the beginning of the character
+stream to the end (left to right, in left-to-right languages).
+Thus, for example, in</p>
+<pre><code class="language-example">`hi`lo`
+.
+&lt;p&gt;&lt;code&gt;hi&lt;/code&gt;lo`&lt;/p&gt;
+</code></pre>
+<p><code>hi</code> is parsed as code, leaving the backtick at the end as a literal
+backtick.</p>
+<h2>Code spans</h2>
+<p>A <a href="@">backtick string</a>
+is a string of one or more backtick characters (<code>`</code>) that is neither
+preceded nor followed by a backtick.</p>
+<p>A <a href="@">code span</a> begins with a backtick string and ends with
+a backtick string of equal length.  The contents of the code span are
+the characters between these two backtick strings, normalized in the
+following ways:</p>
+<ul>
+<li>First, [line endings] are converted to [spaces].</li>
+<li>If the resulting string both begins <em>and</em> ends with a [space]
+character, but does not consist entirely of [space]
+characters, a single [space] character is removed from the
+front and back.  This allows you to include code that begins
+or ends with backtick characters, which must be separated by
+whitespace from the opening or closing backtick strings.</li>
+</ul>
+<p>This is a simple code span:</p>
+<pre><code class="language-example">`foo`
+.
+&lt;p&gt;&lt;code&gt;foo&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<p>Here two backticks are used, because the code contains a backtick.
+This example also illustrates stripping of a single leading and
+trailing space:</p>
+<pre><code class="language-example">`` foo ` bar ``
+.
+&lt;p&gt;&lt;code&gt;foo ` bar&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<p>This example shows the motivation for stripping leading and trailing
+spaces:</p>
+<pre><code class="language-example">` `` `
+.
+&lt;p&gt;&lt;code&gt;``&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<p>Note that only <em>one</em> space is stripped:</p>
+<pre><code class="language-example">`  ``  `
+.
+&lt;p&gt;&lt;code&gt; `` &lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<p>The stripping only happens if the space is on both
+sides of the string:</p>
+<pre><code class="language-example">` a`
+.
+&lt;p&gt;&lt;code&gt; a&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<p>Only [spaces], and not [unicode whitespace] in general, are
+stripped in this way:</p>
+<pre><code class="language-example">` b `
+.
+&lt;p&gt;&lt;code&gt; b &lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<p>No stripping occurs if the code span contains only spaces:</p>
+<pre><code class="language-example">` `
+`  `
+.
+&lt;p&gt;&lt;code&gt; &lt;/code&gt;
+&lt;code&gt;  &lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<p>[Line endings] are treated like spaces:</p>
+<pre><code class="language-example">``
+foo
+bar  
+baz
+``
+.
+&lt;p&gt;&lt;code&gt;foo bar   baz&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">``
+foo 
+``
+.
+&lt;p&gt;&lt;code&gt;foo &lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<p>Interior spaces are not collapsed:</p>
+<pre><code class="language-example">`foo   bar 
+baz`
+.
+&lt;p&gt;&lt;code&gt;foo   bar  baz&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<p>Note that browsers will typically collapse consecutive spaces
+when rendering <code>&lt;code&gt;</code> elements, so it is recommended that
+the following CSS be used:</p>
+<pre><code>code{white-space: pre-wrap;}
+</code></pre>
+<p>Note that backslash escapes do not work in code spans. All backslashes
+are treated literally:</p>
+<pre><code class="language-example">`foo\`bar`
+.
+&lt;p&gt;&lt;code&gt;foo\&lt;/code&gt;bar`&lt;/p&gt;
+</code></pre>
+<p>Backslash escapes are never needed, because one can always choose a
+string of <em>n</em> backtick characters as delimiters, where the code does
+not contain any strings of exactly <em>n</em> backtick characters.</p>
+<pre><code class="language-example">``foo`bar``
+.
+&lt;p&gt;&lt;code&gt;foo`bar&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">` foo `` bar `
+.
+&lt;p&gt;&lt;code&gt;foo `` bar&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<p>Code span backticks have higher precedence than any other inline
+constructs except HTML tags and autolinks.  Thus, for example, this is
+not parsed as emphasized text, since the second <code>*</code> is part of a code
+span:</p>
+<pre><code class="language-example">*foo`*`
+.
+&lt;p&gt;*foo&lt;code&gt;*&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<p>And this is not parsed as a link:</p>
+<pre><code class="language-example">[not a `link](/foo`)
+.
+&lt;p&gt;[not a &lt;code&gt;link](/foo&lt;/code&gt;)&lt;/p&gt;
+</code></pre>
+<p>Code spans, HTML tags, and autolinks have the same precedence.
+Thus, this is code:</p>
+<pre><code class="language-example">`&lt;a href=&quot;`&quot;&gt;`
+.
+&lt;p&gt;&lt;code&gt;&amp;lt;a href=&amp;quot;&lt;/code&gt;&amp;quot;&amp;gt;`&lt;/p&gt;
+</code></pre>
+<p>But this is an HTML tag:</p>
+<pre><code class="language-example">&lt;a href=&quot;`&quot;&gt;`
+.
+&lt;p&gt;&lt;a href=&quot;`&quot;&gt;`&lt;/p&gt;
+</code></pre>
+<p>And this is code:</p>
+<pre><code class="language-example">`&lt;http://foo.bar.`baz&gt;`
+.
+&lt;p&gt;&lt;code&gt;&amp;lt;http://foo.bar.&lt;/code&gt;baz&amp;gt;`&lt;/p&gt;
+</code></pre>
+<p>But this is an autolink:</p>
+<pre><code class="language-example">&lt;http://foo.bar.`baz&gt;`
+.
+&lt;p&gt;&lt;a href=&quot;http://foo.bar.%60baz&quot;&gt;http://foo.bar.`baz&lt;/a&gt;`&lt;/p&gt;
+</code></pre>
+<p>When a backtick string is not closed by a matching backtick string,
+we just have literal backticks:</p>
+<pre><code class="language-example">```foo``
+.
+&lt;p&gt;```foo``&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">`foo
+.
+&lt;p&gt;`foo&lt;/p&gt;
+</code></pre>
+<p>The following case also illustrates the need for opening and
+closing backtick strings to be equal in length:</p>
+<pre><code class="language-example">`foo``bar``
+.
+&lt;p&gt;`foo&lt;code&gt;bar&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<h2>Emphasis and strong emphasis</h2>
+<p>John Gruber's original <a href="http://daringfireball.net/projects/markdown/syntax#em">Markdown syntax
+description</a> says:</p>
+<blockquote>
+<p>Markdown treats asterisks (<code>*</code>) and underscores (<code>_</code>) as indicators of
+emphasis. Text wrapped with one <code>*</code> or <code>_</code> will be wrapped with an HTML
+<code>&lt;em&gt;</code> tag; double <code>*</code>'s or <code>_</code>'s will be wrapped with an HTML <code>&lt;strong&gt;</code>
+tag.</p>
+</blockquote>
+<p>This is enough for most users, but these rules leave much undecided,
+especially when it comes to nested emphasis.  The original
+<code>Markdown.pl</code> test suite makes it clear that triple <code>***</code> and
+<code>___</code> delimiters can be used for strong emphasis, and most
+implementations have also allowed the following patterns:</p>
+<pre><code class="language-markdown">***strong emph***
+***strong** in emph*
+***emph* in strong**
+**in strong *emph***
+*in emph **strong***
+</code></pre>
+<p>The following patterns are less widely supported, but the intent
+is clear and they are useful (especially in contexts like bibliography
+entries):</p>
+<pre><code class="language-markdown">*emph *with emph* in it*
+**strong **with strong** in it**
+</code></pre>
+<p>Many implementations have also restricted intraword emphasis to
+the <code>*</code> forms, to avoid unwanted emphasis in words containing
+internal underscores.  (It is best practice to put these in code
+spans, but users often do not.)</p>
+<pre><code class="language-markdown">internal emphasis: foo*bar*baz
+no emphasis: foo_bar_baz
+</code></pre>
+<p>The rules given below capture all of these patterns, while allowing
+for efficient parsing strategies that do not backtrack.</p>
+<p>First, some definitions.  A <a href="@">delimiter run</a> is either
+a sequence of one or more <code>*</code> characters that is not preceded or
+followed by a non-backslash-escaped <code>*</code> character, or a sequence
+of one or more <code>_</code> characters that is not preceded or followed by
+a non-backslash-escaped <code>_</code> character.</p>
+<p>A <a href="@">left-flanking delimiter run</a> is
+a [delimiter run] that is (1) not followed by [Unicode whitespace],
+and either (2a) not followed by a [Unicode punctuation character], or
+(2b) followed by a [Unicode punctuation character] and
+preceded by [Unicode whitespace] or a [Unicode punctuation character].
+For purposes of this definition, the beginning and the end of
+the line count as Unicode whitespace.</p>
+<p>A <a href="@">right-flanking delimiter run</a> is
+a [delimiter run] that is (1) not preceded by [Unicode whitespace],
+and either (2a) not preceded by a [Unicode punctuation character], or
+(2b) preceded by a [Unicode punctuation character] and
+followed by [Unicode whitespace] or a [Unicode punctuation character].
+For purposes of this definition, the beginning and the end of
+the line count as Unicode whitespace.</p>
+<p>Here are some examples of delimiter runs.</p>
+<ul>
+<li>
+<p>left-flanking but not right-flanking:</p>
+<pre><code>***abc
+  _abc
+**&quot;abc&quot;
+ _&quot;abc&quot;
+</code></pre>
+</li>
+<li>
+<p>right-flanking but not left-flanking:</p>
+<pre><code> abc***
+ abc_
+&quot;abc&quot;**
+&quot;abc&quot;_
+</code></pre>
+</li>
+<li>
+<p>Both left and right-flanking:</p>
+<pre><code> abc***def
+&quot;abc&quot;_&quot;def&quot;
+</code></pre>
+</li>
+<li>
+<p>Neither left nor right-flanking:</p>
+<pre><code>abc *** def
+a _ b
+</code></pre>
+</li>
+</ul>
+<p>(The idea of distinguishing left-flanking and right-flanking
+delimiter runs based on the character before and the character
+after comes from Roopesh Chander's
+<a href="http://www.vfmd.org/vfmd-spec/specification/#procedure-for-identifying-emphasis-tags">vfmd</a>.
+vfmd uses the terminology &quot;emphasis indicator string&quot; instead of &quot;delimiter
+run,&quot; and its rules for distinguishing left- and right-flanking runs
+are a bit more complex than the ones given here.)</p>
+<p>The following rules define emphasis and strong emphasis:</p>
+<ol>
+<li>
+<p>A single <code>*</code> character <a href="@">can open emphasis</a>
+iff (if and only if) it is part of a [left-flanking delimiter run].</p>
+</li>
+<li>
+<p>A single <code>_</code> character [can open emphasis] iff
+it is part of a [left-flanking delimiter run]
+and either (a) not part of a [right-flanking delimiter run]
+or (b) part of a [right-flanking delimiter run]
+preceded by a [Unicode punctuation character].</p>
+</li>
+<li>
+<p>A single <code>*</code> character <a href="@">can close emphasis</a>
+iff it is part of a [right-flanking delimiter run].</p>
+</li>
+<li>
+<p>A single <code>_</code> character [can close emphasis] iff
+it is part of a [right-flanking delimiter run]
+and either (a) not part of a [left-flanking delimiter run]
+or (b) part of a [left-flanking delimiter run]
+followed by a [Unicode punctuation character].</p>
+</li>
+<li>
+<p>A double <code>**</code> <a href="@">can open strong emphasis</a>
+iff it is part of a [left-flanking delimiter run].</p>
+</li>
+<li>
+<p>A double <code>__</code> [can open strong emphasis] iff
+it is part of a [left-flanking delimiter run]
+and either (a) not part of a [right-flanking delimiter run]
+or (b) part of a [right-flanking delimiter run]
+preceded by a [Unicode punctuation character].</p>
+</li>
+<li>
+<p>A double <code>**</code> <a href="@">can close strong emphasis</a>
+iff it is part of a [right-flanking delimiter run].</p>
+</li>
+<li>
+<p>A double <code>__</code> [can close strong emphasis] iff
+it is part of a [right-flanking delimiter run]
+and either (a) not part of a [left-flanking delimiter run]
+or (b) part of a [left-flanking delimiter run]
+followed by a [Unicode punctuation character].</p>
+</li>
+<li>
+<p>Emphasis begins with a delimiter that [can open emphasis] and ends
+with a delimiter that [can close emphasis], and that uses the same
+character (<code>_</code> or <code>*</code>) as the opening delimiter.  The
+opening and closing delimiters must belong to separate
+[delimiter runs].  If one of the delimiters can both
+open and close emphasis, then the sum of the lengths of the
+delimiter runs containing the opening and closing delimiters
+must not be a multiple of 3 unless both lengths are
+multiples of 3.</p>
+</li>
+<li>
+<p>Strong emphasis begins with a delimiter that
+[can open strong emphasis] and ends with a delimiter that
+[can close strong emphasis], and that uses the same character
+(<code>_</code> or <code>*</code>) as the opening delimiter.  The
+opening and closing delimiters must belong to separate
+[delimiter runs].  If one of the delimiters can both open
+and close strong emphasis, then the sum of the lengths of
+the delimiter runs containing the opening and closing
+delimiters must not be a multiple of 3 unless both lengths
+are multiples of 3.</p>
+</li>
+<li>
+<p>A literal <code>*</code> character cannot occur at the beginning or end of
+<code>*</code>-delimited emphasis or <code>**</code>-delimited strong emphasis, unless it
+is backslash-escaped.</p>
+</li>
+<li>
+<p>A literal <code>_</code> character cannot occur at the beginning or end of
+<code>_</code>-delimited emphasis or <code>__</code>-delimited strong emphasis, unless it
+is backslash-escaped.</p>
+</li>
+</ol>
+<p>Where rules 1--12 above are compatible with multiple parsings,
+the following principles resolve ambiguity:</p>
+<ol start="13">
+<li>
+<p>The number of nestings should be minimized. Thus, for example,
+an interpretation <code>&lt;strong&gt;...&lt;/strong&gt;</code> is always preferred to
+<code>&lt;em&gt;&lt;em&gt;...&lt;/em&gt;&lt;/em&gt;</code>.</p>
+</li>
+<li>
+<p>An interpretation <code>&lt;em&gt;&lt;strong&gt;...&lt;/strong&gt;&lt;/em&gt;</code> is always
+preferred to <code>&lt;strong&gt;&lt;em&gt;...&lt;/em&gt;&lt;/strong&gt;</code>.</p>
+</li>
+<li>
+<p>When two potential emphasis or strong emphasis spans overlap,
+so that the second begins before the first ends and ends after
+the first ends, the first takes precedence. Thus, for example,
+<code>*foo _bar* baz_</code> is parsed as <code>&lt;em&gt;foo _bar&lt;/em&gt; baz_</code> rather
+than <code>*foo &lt;em&gt;bar* baz&lt;/em&gt;</code>.</p>
+</li>
+<li>
+<p>When there are two potential emphasis or strong emphasis spans
+with the same closing delimiter, the shorter one (the one that
+opens later) takes precedence. Thus, for example,
+<code>**foo **bar baz**</code> is parsed as <code>**foo &lt;strong&gt;bar baz&lt;/strong&gt;</code>
+rather than <code>&lt;strong&gt;foo **bar baz&lt;/strong&gt;</code>.</p>
+</li>
+<li>
+<p>Inline code spans, links, images, and HTML tags group more tightly
+than emphasis.  So, when there is a choice between an interpretation
+that contains one of these elements and one that does not, the
+former always wins.  Thus, for example, <code>*[foo*](bar)</code> is
+parsed as <code>*&lt;a href=&quot;bar&quot;&gt;foo*&lt;/a&gt;</code> rather than as
+<code>&lt;em&gt;[foo&lt;/em&gt;](bar)</code>.</p>
+</li>
+</ol>
+<p>These rules can be illustrated through a series of examples.</p>
+<p>Rule 1:</p>
+<pre><code class="language-example">*foo bar*
+.
+&lt;p&gt;&lt;em&gt;foo bar&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>This is not emphasis, because the opening <code>*</code> is followed by
+whitespace, and hence not part of a [left-flanking delimiter run]:</p>
+<pre><code class="language-example">a * foo bar*
+.
+&lt;p&gt;a * foo bar*&lt;/p&gt;
+</code></pre>
+<p>This is not emphasis, because the opening <code>*</code> is preceded
+by an alphanumeric and followed by punctuation, and hence
+not part of a [left-flanking delimiter run]:</p>
+<pre><code class="language-example">a*&quot;foo&quot;*
+.
+&lt;p&gt;a*&amp;quot;foo&amp;quot;*&lt;/p&gt;
+</code></pre>
+<p>Unicode nonbreaking spaces count as whitespace, too:</p>
+<pre><code class="language-example">* a *
+.
+&lt;p&gt;* a *&lt;/p&gt;
+</code></pre>
+<p>Intraword emphasis with <code>*</code> is permitted:</p>
+<pre><code class="language-example">foo*bar*
+.
+&lt;p&gt;foo&lt;em&gt;bar&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">5*6*78
+.
+&lt;p&gt;5&lt;em&gt;6&lt;/em&gt;78&lt;/p&gt;
+</code></pre>
+<p>Rule 2:</p>
+<pre><code class="language-example">_foo bar_
+.
+&lt;p&gt;&lt;em&gt;foo bar&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>This is not emphasis, because the opening <code>_</code> is followed by
+whitespace:</p>
+<pre><code class="language-example">_ foo bar_
+.
+&lt;p&gt;_ foo bar_&lt;/p&gt;
+</code></pre>
+<p>This is not emphasis, because the opening <code>_</code> is preceded
+by an alphanumeric and followed by punctuation:</p>
+<pre><code class="language-example">a_&quot;foo&quot;_
+.
+&lt;p&gt;a_&amp;quot;foo&amp;quot;_&lt;/p&gt;
+</code></pre>
+<p>Emphasis with <code>_</code> is not allowed inside words:</p>
+<pre><code class="language-example">foo_bar_
+.
+&lt;p&gt;foo_bar_&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">5_6_78
+.
+&lt;p&gt;5_6_78&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">пристаням_стремятся_
+.
+&lt;p&gt;пристаням_стремятся_&lt;/p&gt;
+</code></pre>
+<p>Here <code>_</code> does not generate emphasis, because the first delimiter run
+is right-flanking and the second left-flanking:</p>
+<pre><code class="language-example">aa_&quot;bb&quot;_cc
+.
+&lt;p&gt;aa_&amp;quot;bb&amp;quot;_cc&lt;/p&gt;
+</code></pre>
+<p>This is emphasis, even though the opening delimiter is
+both left- and right-flanking, because it is preceded by
+punctuation:</p>
+<pre><code class="language-example">foo-_(bar)_
+.
+&lt;p&gt;foo-&lt;em&gt;(bar)&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>Rule 3:</p>
+<p>This is not emphasis, because the closing delimiter does
+not match the opening delimiter:</p>
+<pre><code class="language-example">_foo*
+.
+&lt;p&gt;_foo*&lt;/p&gt;
+</code></pre>
+<p>This is not emphasis, because the closing <code>*</code> is preceded by
+whitespace:</p>
+<pre><code class="language-example">*foo bar *
+.
+&lt;p&gt;*foo bar *&lt;/p&gt;
+</code></pre>
+<p>A line ending also counts as whitespace:</p>
+<pre><code class="language-example">*foo bar
+*
+.
+&lt;p&gt;*foo bar
+*&lt;/p&gt;
+</code></pre>
+<p>This is not emphasis, because the second <code>*</code> is
+preceded by punctuation and followed by an alphanumeric
+(hence it is not part of a [right-flanking delimiter run]:</p>
+<pre><code class="language-example">*(*foo)
+.
+&lt;p&gt;*(*foo)&lt;/p&gt;
+</code></pre>
+<p>The point of this restriction is more easily appreciated
+with this example:</p>
+<pre><code class="language-example">*(*foo*)*
+.
+&lt;p&gt;&lt;em&gt;(&lt;em&gt;foo&lt;/em&gt;)&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>Intraword emphasis with <code>*</code> is allowed:</p>
+<pre><code class="language-example">*foo*bar
+.
+&lt;p&gt;&lt;em&gt;foo&lt;/em&gt;bar&lt;/p&gt;
+</code></pre>
+<p>Rule 4:</p>
+<p>This is not emphasis, because the closing <code>_</code> is preceded by
+whitespace:</p>
+<pre><code class="language-example">_foo bar _
+.
+&lt;p&gt;_foo bar _&lt;/p&gt;
+</code></pre>
+<p>This is not emphasis, because the second <code>_</code> is
+preceded by punctuation and followed by an alphanumeric:</p>
+<pre><code class="language-example">_(_foo)
+.
+&lt;p&gt;_(_foo)&lt;/p&gt;
+</code></pre>
+<p>This is emphasis within emphasis:</p>
+<pre><code class="language-example">_(_foo_)_
+.
+&lt;p&gt;&lt;em&gt;(&lt;em&gt;foo&lt;/em&gt;)&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>Intraword emphasis is disallowed for <code>_</code>:</p>
+<pre><code class="language-example">_foo_bar
+.
+&lt;p&gt;_foo_bar&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">_пристаням_стремятся
+.
+&lt;p&gt;_пристаням_стремятся&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">_foo_bar_baz_
+.
+&lt;p&gt;&lt;em&gt;foo_bar_baz&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>This is emphasis, even though the closing delimiter is
+both left- and right-flanking, because it is followed by
+punctuation:</p>
+<pre><code class="language-example">_(bar)_.
+.
+&lt;p&gt;&lt;em&gt;(bar)&lt;/em&gt;.&lt;/p&gt;
+</code></pre>
+<p>Rule 5:</p>
+<pre><code class="language-example">**foo bar**
+.
+&lt;p&gt;&lt;strong&gt;foo bar&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<p>This is not strong emphasis, because the opening delimiter is
+followed by whitespace:</p>
+<pre><code class="language-example">** foo bar**
+.
+&lt;p&gt;** foo bar**&lt;/p&gt;
+</code></pre>
+<p>This is not strong emphasis, because the opening <code>**</code> is preceded
+by an alphanumeric and followed by punctuation, and hence
+not part of a [left-flanking delimiter run]:</p>
+<pre><code class="language-example">a**&quot;foo&quot;**
+.
+&lt;p&gt;a**&amp;quot;foo&amp;quot;**&lt;/p&gt;
+</code></pre>
+<p>Intraword strong emphasis with <code>**</code> is permitted:</p>
+<pre><code class="language-example">foo**bar**
+.
+&lt;p&gt;foo&lt;strong&gt;bar&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<p>Rule 6:</p>
+<pre><code class="language-example">__foo bar__
+.
+&lt;p&gt;&lt;strong&gt;foo bar&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<p>This is not strong emphasis, because the opening delimiter is
+followed by whitespace:</p>
+<pre><code class="language-example">__ foo bar__
+.
+&lt;p&gt;__ foo bar__&lt;/p&gt;
+</code></pre>
+<p>A line ending counts as whitespace:</p>
+<pre><code class="language-example">__
+foo bar__
+.
+&lt;p&gt;__
+foo bar__&lt;/p&gt;
+</code></pre>
+<p>This is not strong emphasis, because the opening <code>__</code> is preceded
+by an alphanumeric and followed by punctuation:</p>
+<pre><code class="language-example">a__&quot;foo&quot;__
+.
+&lt;p&gt;a__&amp;quot;foo&amp;quot;__&lt;/p&gt;
+</code></pre>
+<p>Intraword strong emphasis is forbidden with <code>__</code>:</p>
+<pre><code class="language-example">foo__bar__
+.
+&lt;p&gt;foo__bar__&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">5__6__78
+.
+&lt;p&gt;5__6__78&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">пристаням__стремятся__
+.
+&lt;p&gt;пристаням__стремятся__&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">__foo, __bar__, baz__
+.
+&lt;p&gt;&lt;strong&gt;foo, &lt;strong&gt;bar&lt;/strong&gt;, baz&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<p>This is strong emphasis, even though the opening delimiter is
+both left- and right-flanking, because it is preceded by
+punctuation:</p>
+<pre><code class="language-example">foo-__(bar)__
+.
+&lt;p&gt;foo-&lt;strong&gt;(bar)&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<p>Rule 7:</p>
+<p>This is not strong emphasis, because the closing delimiter is preceded
+by whitespace:</p>
+<pre><code class="language-example">**foo bar **
+.
+&lt;p&gt;**foo bar **&lt;/p&gt;
+</code></pre>
+<p>(Nor can it be interpreted as an emphasized <code>*foo bar *</code>, because of
+Rule 11.)</p>
+<p>This is not strong emphasis, because the second <code>**</code> is
+preceded by punctuation and followed by an alphanumeric:</p>
+<pre><code class="language-example">**(**foo)
+.
+&lt;p&gt;**(**foo)&lt;/p&gt;
+</code></pre>
+<p>The point of this restriction is more easily appreciated
+with these examples:</p>
+<pre><code class="language-example">*(**foo**)*
+.
+&lt;p&gt;&lt;em&gt;(&lt;strong&gt;foo&lt;/strong&gt;)&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">**Gomphocarpus (*Gomphocarpus physocarpus*, syn.
+*Asclepias physocarpa*)**
+.
+&lt;p&gt;&lt;strong&gt;Gomphocarpus (&lt;em&gt;Gomphocarpus physocarpus&lt;/em&gt;, syn.
+&lt;em&gt;Asclepias physocarpa&lt;/em&gt;)&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">**foo &quot;*bar*&quot; foo**
+.
+&lt;p&gt;&lt;strong&gt;foo &amp;quot;&lt;em&gt;bar&lt;/em&gt;&amp;quot; foo&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<p>Intraword emphasis:</p>
+<pre><code class="language-example">**foo**bar
+.
+&lt;p&gt;&lt;strong&gt;foo&lt;/strong&gt;bar&lt;/p&gt;
+</code></pre>
+<p>Rule 8:</p>
+<p>This is not strong emphasis, because the closing delimiter is
+preceded by whitespace:</p>
+<pre><code class="language-example">__foo bar __
+.
+&lt;p&gt;__foo bar __&lt;/p&gt;
+</code></pre>
+<p>This is not strong emphasis, because the second <code>__</code> is
+preceded by punctuation and followed by an alphanumeric:</p>
+<pre><code class="language-example">__(__foo)
+.
+&lt;p&gt;__(__foo)&lt;/p&gt;
+</code></pre>
+<p>The point of this restriction is more easily appreciated
+with this example:</p>
+<pre><code class="language-example">_(__foo__)_
+.
+&lt;p&gt;&lt;em&gt;(&lt;strong&gt;foo&lt;/strong&gt;)&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>Intraword strong emphasis is forbidden with <code>__</code>:</p>
+<pre><code class="language-example">__foo__bar
+.
+&lt;p&gt;__foo__bar&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">__пристаням__стремятся
+.
+&lt;p&gt;__пристаням__стремятся&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">__foo__bar__baz__
+.
+&lt;p&gt;&lt;strong&gt;foo__bar__baz&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<p>This is strong emphasis, even though the closing delimiter is
+both left- and right-flanking, because it is followed by
+punctuation:</p>
+<pre><code class="language-example">__(bar)__.
+.
+&lt;p&gt;&lt;strong&gt;(bar)&lt;/strong&gt;.&lt;/p&gt;
+</code></pre>
+<p>Rule 9:</p>
+<p>Any nonempty sequence of inline elements can be the contents of an
+emphasized span.</p>
+<pre><code class="language-example">*foo [bar](/url)*
+.
+&lt;p&gt;&lt;em&gt;foo &lt;a href=&quot;/url&quot;&gt;bar&lt;/a&gt;&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">*foo
+bar*
+.
+&lt;p&gt;&lt;em&gt;foo
+bar&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>In particular, emphasis and strong emphasis can be nested
+inside emphasis:</p>
+<pre><code class="language-example">_foo __bar__ baz_
+.
+&lt;p&gt;&lt;em&gt;foo &lt;strong&gt;bar&lt;/strong&gt; baz&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">_foo _bar_ baz_
+.
+&lt;p&gt;&lt;em&gt;foo &lt;em&gt;bar&lt;/em&gt; baz&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">__foo_ bar_
+.
+&lt;p&gt;&lt;em&gt;&lt;em&gt;foo&lt;/em&gt; bar&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">*foo *bar**
+.
+&lt;p&gt;&lt;em&gt;foo &lt;em&gt;bar&lt;/em&gt;&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">*foo **bar** baz*
+.
+&lt;p&gt;&lt;em&gt;foo &lt;strong&gt;bar&lt;/strong&gt; baz&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">*foo**bar**baz*
+.
+&lt;p&gt;&lt;em&gt;foo&lt;strong&gt;bar&lt;/strong&gt;baz&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>Note that in the preceding case, the interpretation</p>
+<pre><code class="language-markdown">&lt;p&gt;&lt;em&gt;foo&lt;/em&gt;&lt;em&gt;bar&lt;em&gt;&lt;/em&gt;baz&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>is precluded by the condition that a delimiter that
+can both open and close (like the <code>*</code> after <code>foo</code>)
+cannot form emphasis if the sum of the lengths of
+the delimiter runs containing the opening and
+closing delimiters is a multiple of 3 unless
+both lengths are multiples of 3.</p>
+<p>For the same reason, we don't get two consecutive
+emphasis sections in this example:</p>
+<pre><code class="language-example">*foo**bar*
+.
+&lt;p&gt;&lt;em&gt;foo**bar&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>The same condition ensures that the following
+cases are all strong emphasis nested inside
+emphasis, even when the interior whitespace is
+omitted:</p>
+<pre><code class="language-example">***foo** bar*
+.
+&lt;p&gt;&lt;em&gt;&lt;strong&gt;foo&lt;/strong&gt; bar&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">*foo **bar***
+.
+&lt;p&gt;&lt;em&gt;foo &lt;strong&gt;bar&lt;/strong&gt;&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">*foo**bar***
+.
+&lt;p&gt;&lt;em&gt;foo&lt;strong&gt;bar&lt;/strong&gt;&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>When the lengths of the interior closing and opening
+delimiter runs are <em>both</em> multiples of 3, though,
+they can match to create emphasis:</p>
+<pre><code class="language-example">foo***bar***baz
+.
+&lt;p&gt;foo&lt;em&gt;&lt;strong&gt;bar&lt;/strong&gt;&lt;/em&gt;baz&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">foo******bar*********baz
+.
+&lt;p&gt;foo&lt;strong&gt;&lt;strong&gt;&lt;strong&gt;bar&lt;/strong&gt;&lt;/strong&gt;&lt;/strong&gt;***baz&lt;/p&gt;
+</code></pre>
+<p>Indefinite levels of nesting are possible:</p>
+<pre><code class="language-example">*foo **bar *baz* bim** bop*
+.
+&lt;p&gt;&lt;em&gt;foo &lt;strong&gt;bar &lt;em&gt;baz&lt;/em&gt; bim&lt;/strong&gt; bop&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">*foo [*bar*](/url)*
+.
+&lt;p&gt;&lt;em&gt;foo &lt;a href=&quot;/url&quot;&gt;&lt;em&gt;bar&lt;/em&gt;&lt;/a&gt;&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>There can be no empty emphasis or strong emphasis:</p>
+<pre><code class="language-example">** is not an empty emphasis
+.
+&lt;p&gt;** is not an empty emphasis&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">**** is not an empty strong emphasis
+.
+&lt;p&gt;**** is not an empty strong emphasis&lt;/p&gt;
+</code></pre>
+<p>Rule 10:</p>
+<p>Any nonempty sequence of inline elements can be the contents of an
+strongly emphasized span.</p>
+<pre><code class="language-example">**foo [bar](/url)**
+.
+&lt;p&gt;&lt;strong&gt;foo &lt;a href=&quot;/url&quot;&gt;bar&lt;/a&gt;&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">**foo
+bar**
+.
+&lt;p&gt;&lt;strong&gt;foo
+bar&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<p>In particular, emphasis and strong emphasis can be nested
+inside strong emphasis:</p>
+<pre><code class="language-example">__foo _bar_ baz__
+.
+&lt;p&gt;&lt;strong&gt;foo &lt;em&gt;bar&lt;/em&gt; baz&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">__foo __bar__ baz__
+.
+&lt;p&gt;&lt;strong&gt;foo &lt;strong&gt;bar&lt;/strong&gt; baz&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">____foo__ bar__
+.
+&lt;p&gt;&lt;strong&gt;&lt;strong&gt;foo&lt;/strong&gt; bar&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">**foo **bar****
+.
+&lt;p&gt;&lt;strong&gt;foo &lt;strong&gt;bar&lt;/strong&gt;&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">**foo *bar* baz**
+.
+&lt;p&gt;&lt;strong&gt;foo &lt;em&gt;bar&lt;/em&gt; baz&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">**foo*bar*baz**
+.
+&lt;p&gt;&lt;strong&gt;foo&lt;em&gt;bar&lt;/em&gt;baz&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">***foo* bar**
+.
+&lt;p&gt;&lt;strong&gt;&lt;em&gt;foo&lt;/em&gt; bar&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">**foo *bar***
+.
+&lt;p&gt;&lt;strong&gt;foo &lt;em&gt;bar&lt;/em&gt;&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<p>Indefinite levels of nesting are possible:</p>
+<pre><code class="language-example">**foo *bar **baz**
+bim* bop**
+.
+&lt;p&gt;&lt;strong&gt;foo &lt;em&gt;bar &lt;strong&gt;baz&lt;/strong&gt;
+bim&lt;/em&gt; bop&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">**foo [*bar*](/url)**
+.
+&lt;p&gt;&lt;strong&gt;foo &lt;a href=&quot;/url&quot;&gt;&lt;em&gt;bar&lt;/em&gt;&lt;/a&gt;&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<p>There can be no empty emphasis or strong emphasis:</p>
+<pre><code class="language-example">__ is not an empty emphasis
+.
+&lt;p&gt;__ is not an empty emphasis&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">____ is not an empty strong emphasis
+.
+&lt;p&gt;____ is not an empty strong emphasis&lt;/p&gt;
+</code></pre>
+<p>Rule 11:</p>
+<pre><code class="language-example">foo ***
+.
+&lt;p&gt;foo ***&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">foo *\**
+.
+&lt;p&gt;foo &lt;em&gt;*&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">foo *_*
+.
+&lt;p&gt;foo &lt;em&gt;_&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">foo *****
+.
+&lt;p&gt;foo *****&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">foo **\***
+.
+&lt;p&gt;foo &lt;strong&gt;*&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">foo **_**
+.
+&lt;p&gt;foo &lt;strong&gt;_&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<p>Note that when delimiters do not match evenly, Rule 11 determines
+that the excess literal <code>*</code> characters will appear outside of the
+emphasis, rather than inside it:</p>
+<pre><code class="language-example">**foo*
+.
+&lt;p&gt;*&lt;em&gt;foo&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">*foo**
+.
+&lt;p&gt;&lt;em&gt;foo&lt;/em&gt;*&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">***foo**
+.
+&lt;p&gt;*&lt;strong&gt;foo&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">****foo*
+.
+&lt;p&gt;***&lt;em&gt;foo&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">**foo***
+.
+&lt;p&gt;&lt;strong&gt;foo&lt;/strong&gt;*&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">*foo****
+.
+&lt;p&gt;&lt;em&gt;foo&lt;/em&gt;***&lt;/p&gt;
+</code></pre>
+<p>Rule 12:</p>
+<pre><code class="language-example">foo ___
+.
+&lt;p&gt;foo ___&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">foo _\__
+.
+&lt;p&gt;foo &lt;em&gt;_&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">foo _*_
+.
+&lt;p&gt;foo &lt;em&gt;*&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">foo _____
+.
+&lt;p&gt;foo _____&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">foo __\___
+.
+&lt;p&gt;foo &lt;strong&gt;_&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">foo __*__
+.
+&lt;p&gt;foo &lt;strong&gt;*&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">__foo_
+.
+&lt;p&gt;_&lt;em&gt;foo&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>Note that when delimiters do not match evenly, Rule 12 determines
+that the excess literal <code>_</code> characters will appear outside of the
+emphasis, rather than inside it:</p>
+<pre><code class="language-example">_foo__
+.
+&lt;p&gt;&lt;em&gt;foo&lt;/em&gt;_&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">___foo__
+.
+&lt;p&gt;_&lt;strong&gt;foo&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">____foo_
+.
+&lt;p&gt;___&lt;em&gt;foo&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">__foo___
+.
+&lt;p&gt;&lt;strong&gt;foo&lt;/strong&gt;_&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">_foo____
+.
+&lt;p&gt;&lt;em&gt;foo&lt;/em&gt;___&lt;/p&gt;
+</code></pre>
+<p>Rule 13 implies that if you want emphasis nested directly inside
+emphasis, you must use different delimiters:</p>
+<pre><code class="language-example">**foo**
+.
+&lt;p&gt;&lt;strong&gt;foo&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">*_foo_*
+.
+&lt;p&gt;&lt;em&gt;&lt;em&gt;foo&lt;/em&gt;&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">__foo__
+.
+&lt;p&gt;&lt;strong&gt;foo&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">_*foo*_
+.
+&lt;p&gt;&lt;em&gt;&lt;em&gt;foo&lt;/em&gt;&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>However, strong emphasis within strong emphasis is possible without
+switching delimiters:</p>
+<pre><code class="language-example">****foo****
+.
+&lt;p&gt;&lt;strong&gt;&lt;strong&gt;foo&lt;/strong&gt;&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">____foo____
+.
+&lt;p&gt;&lt;strong&gt;&lt;strong&gt;foo&lt;/strong&gt;&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<p>Rule 13 can be applied to arbitrarily long sequences of
+delimiters:</p>
+<pre><code class="language-example">******foo******
+.
+&lt;p&gt;&lt;strong&gt;&lt;strong&gt;&lt;strong&gt;foo&lt;/strong&gt;&lt;/strong&gt;&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<p>Rule 14:</p>
+<pre><code class="language-example">***foo***
+.
+&lt;p&gt;&lt;em&gt;&lt;strong&gt;foo&lt;/strong&gt;&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">_____foo_____
+.
+&lt;p&gt;&lt;em&gt;&lt;strong&gt;&lt;strong&gt;foo&lt;/strong&gt;&lt;/strong&gt;&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>Rule 15:</p>
+<pre><code class="language-example">*foo _bar* baz_
+.
+&lt;p&gt;&lt;em&gt;foo _bar&lt;/em&gt; baz_&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">*foo __bar *baz bim__ bam*
+.
+&lt;p&gt;&lt;em&gt;foo &lt;strong&gt;bar *baz bim&lt;/strong&gt; bam&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>Rule 16:</p>
+<pre><code class="language-example">**foo **bar baz**
+.
+&lt;p&gt;**foo &lt;strong&gt;bar baz&lt;/strong&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">*foo *bar baz*
+.
+&lt;p&gt;*foo &lt;em&gt;bar baz&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>Rule 17:</p>
+<pre><code class="language-example">*[bar*](/url)
+.
+&lt;p&gt;*&lt;a href=&quot;/url&quot;&gt;bar*&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">_foo [bar_](/url)
+.
+&lt;p&gt;_foo &lt;a href=&quot;/url&quot;&gt;bar_&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">*&lt;img src=&quot;foo&quot; title=&quot;*&quot;/&gt;
+.
+&lt;p&gt;*&lt;img src=&quot;foo&quot; title=&quot;*&quot;/&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">**&lt;a href=&quot;**&quot;&gt;
+.
+&lt;p&gt;**&lt;a href=&quot;**&quot;&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">__&lt;a href=&quot;__&quot;&gt;
+.
+&lt;p&gt;__&lt;a href=&quot;__&quot;&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">*a `*`*
+.
+&lt;p&gt;&lt;em&gt;a &lt;code&gt;*&lt;/code&gt;&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">_a `_`_
+.
+&lt;p&gt;&lt;em&gt;a &lt;code&gt;_&lt;/code&gt;&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">**a&lt;http://foo.bar/?q=**&gt;
+.
+&lt;p&gt;**a&lt;a href=&quot;http://foo.bar/?q=**&quot;&gt;http://foo.bar/?q=**&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">__a&lt;http://foo.bar/?q=__&gt;
+.
+&lt;p&gt;__a&lt;a href=&quot;http://foo.bar/?q=__&quot;&gt;http://foo.bar/?q=__&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<h2>Links</h2>
+<p>A link contains [link text] (the visible text), a [link destination]
+(the URI that is the link destination), and optionally a [link title].
+There are two basic kinds of links in Markdown.  In [inline links] the
+destination and title are given immediately after the link text.  In
+[reference links] the destination and title are defined elsewhere in
+the document.</p>
+<p>A <a href="@">link text</a> consists of a sequence of zero or more
+inline elements enclosed by square brackets (<code>[</code> and <code>]</code>).  The
+following rules apply:</p>
+<ul>
+<li>
+<p>Links may not contain other links, at any level of nesting. If
+multiple otherwise valid link definitions appear nested inside each
+other, the inner-most definition is used.</p>
+</li>
+<li>
+<p>Brackets are allowed in the [link text] only if (a) they
+are backslash-escaped or (b) they appear as a matched pair of brackets,
+with an open bracket <code>[</code>, a sequence of zero or more inlines, and
+a close bracket <code>]</code>.</p>
+</li>
+<li>
+<p>Backtick [code spans], [autolinks], and raw [HTML tags] bind more tightly
+than the brackets in link text.  Thus, for example,
+<code>[foo`]`</code> could not be a link text, since the second <code>]</code>
+is part of a code span.</p>
+</li>
+<li>
+<p>The brackets in link text bind more tightly than markers for
+[emphasis and strong emphasis]. Thus, for example, <code>*[foo*](url)</code> is a link.</p>
+</li>
+</ul>
+<p>A <a href="@">link destination</a> consists of either</p>
+<ul>
+<li>
+<p>a sequence of zero or more characters between an opening <code>&lt;</code> and a
+closing <code>&gt;</code> that contains no line endings or unescaped
+<code>&lt;</code> or <code>&gt;</code> characters, or</p>
+</li>
+<li>
+<p>a nonempty sequence of characters that does not start with <code>&lt;</code>,
+does not include [ASCII control characters][ASCII control character]
+or [space] character, and includes parentheses only if (a) they are
+backslash-escaped or (b) they are part of a balanced pair of
+unescaped parentheses.
+(Implementations may impose limits on parentheses nesting to
+avoid performance issues, but at least three levels of nesting
+should be supported.)</p>
+</li>
+</ul>
+<p>A <a href="@">link title</a>  consists of either</p>
+<ul>
+<li>
+<p>a sequence of zero or more characters between straight double-quote
+characters (<code>&quot;</code>), including a <code>&quot;</code> character only if it is
+backslash-escaped, or</p>
+</li>
+<li>
+<p>a sequence of zero or more characters between straight single-quote
+characters (<code>'</code>), including a <code>'</code> character only if it is
+backslash-escaped, or</p>
+</li>
+<li>
+<p>a sequence of zero or more characters between matching parentheses
+(<code>(...)</code>), including a <code>(</code> or <code>)</code> character only if it is
+backslash-escaped.</p>
+</li>
+</ul>
+<p>Although [link titles] may span multiple lines, they may not contain
+a [blank line].</p>
+<p>An <a href="@">inline link</a> consists of a [link text] followed immediately
+by a left parenthesis <code>(</code>, an optional [link destination], an optional
+[link title], and a right parenthesis <code>)</code>.
+These four components may be separated by spaces, tabs, and up to one line
+ending.
+If both [link destination] and [link title] are present, they <em>must</em> be
+separated by spaces, tabs, and up to one line ending.</p>
+<p>The link's text consists of the inlines contained
+in the [link text] (excluding the enclosing square brackets).
+The link's URI consists of the link destination, excluding enclosing
+<code>&lt;...&gt;</code> if present, with backslash-escapes in effect as described
+above.  The link's title consists of the link title, excluding its
+enclosing delimiters, with backslash-escapes in effect as described
+above.</p>
+<p>Here is a simple inline link:</p>
+<pre><code class="language-example">[link](/uri &quot;title&quot;)
+.
+&lt;p&gt;&lt;a href=&quot;/uri&quot; title=&quot;title&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>The title, the link text and even
+the destination may be omitted:</p>
+<pre><code class="language-example">[link](/uri)
+.
+&lt;p&gt;&lt;a href=&quot;/uri&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[](./target.md)
+.
+&lt;p&gt;&lt;a href=&quot;./target.md&quot;&gt;&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[link]()
+.
+&lt;p&gt;&lt;a href=&quot;&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[link](&lt;&gt;)
+.
+&lt;p&gt;&lt;a href=&quot;&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[]()
+.
+&lt;p&gt;&lt;a href=&quot;&quot;&gt;&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>The destination can only contain spaces if it is
+enclosed in pointy brackets:</p>
+<pre><code class="language-example">[link](/my uri)
+.
+&lt;p&gt;[link](/my uri)&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[link](&lt;/my uri&gt;)
+.
+&lt;p&gt;&lt;a href=&quot;/my%20uri&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>The destination cannot contain line endings,
+even if enclosed in pointy brackets:</p>
+<pre><code class="language-example">[link](foo
+bar)
+.
+&lt;p&gt;[link](foo
+bar)&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[link](&lt;foo
+bar&gt;)
+.
+&lt;p&gt;[link](&lt;foo
+bar&gt;)&lt;/p&gt;
+</code></pre>
+<p>The destination can contain <code>)</code> if it is enclosed
+in pointy brackets:</p>
+<pre><code class="language-example">[a](&lt;b)c&gt;)
+.
+&lt;p&gt;&lt;a href=&quot;b)c&quot;&gt;a&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Pointy brackets that enclose links must be unescaped:</p>
+<pre><code class="language-example">[link](&lt;foo\&gt;)
+.
+&lt;p&gt;[link](&amp;lt;foo&amp;gt;)&lt;/p&gt;
+</code></pre>
+<p>These are not links, because the opening pointy bracket
+is not matched properly:</p>
+<pre><code class="language-example">[a](&lt;b)c
+[a](&lt;b)c&gt;
+[a](&lt;b&gt;c)
+.
+&lt;p&gt;[a](&amp;lt;b)c
+[a](&amp;lt;b)c&amp;gt;
+[a](&lt;b&gt;c)&lt;/p&gt;
+</code></pre>
+<p>Parentheses inside the link destination may be escaped:</p>
+<pre><code class="language-example">[link](\(foo\))
+.
+&lt;p&gt;&lt;a href=&quot;(foo)&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Any number of parentheses are allowed without escaping, as long as they are
+balanced:</p>
+<pre><code class="language-example">[link](foo(and(bar)))
+.
+&lt;p&gt;&lt;a href=&quot;foo(and(bar))&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>However, if you have unbalanced parentheses, you need to escape or use the
+<code>&lt;...&gt;</code> form:</p>
+<pre><code class="language-example">[link](foo(and(bar))
+.
+&lt;p&gt;[link](foo(and(bar))&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[link](foo\(and\(bar\))
+.
+&lt;p&gt;&lt;a href=&quot;foo(and(bar)&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[link](&lt;foo(and(bar)&gt;)
+.
+&lt;p&gt;&lt;a href=&quot;foo(and(bar)&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Parentheses and other symbols can also be escaped, as usual
+in Markdown:</p>
+<pre><code class="language-example">[link](foo\)\:)
+.
+&lt;p&gt;&lt;a href=&quot;foo):&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>A link can contain fragment identifiers and queries:</p>
+<pre><code class="language-example">[link](#fragment)
+
+[link](http://example.com#fragment)
+
+[link](http://example.com?foo=3#frag)
+.
+&lt;p&gt;&lt;a href=&quot;#fragment&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+&lt;p&gt;&lt;a href=&quot;http://example.com#fragment&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+&lt;p&gt;&lt;a href=&quot;http://example.com?foo=3#frag&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Note that a backslash before a non-escapable character is
+just a backslash:</p>
+<pre><code class="language-example">[link](foo\bar)
+.
+&lt;p&gt;&lt;a href=&quot;foo%5Cbar&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>URL-escaping should be left alone inside the destination, as all
+URL-escaped characters are also valid URL characters. Entity and
+numerical character references in the destination will be parsed
+into the corresponding Unicode code points, as usual.  These may
+be optionally URL-escaped when written as HTML, but this spec
+does not enforce any particular policy for rendering URLs in
+HTML or other formats.  Renderers may make different decisions
+about how to escape or normalize URLs in the output.</p>
+<pre><code class="language-example">[link](foo%20b&amp;auml;)
+.
+&lt;p&gt;&lt;a href=&quot;foo%20b%C3%A4&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Note that, because titles can often be parsed as destinations,
+if you try to omit the destination and keep the title, you'll
+get unexpected results:</p>
+<pre><code class="language-example">[link](&quot;title&quot;)
+.
+&lt;p&gt;&lt;a href=&quot;%22title%22&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Titles may be in single quotes, double quotes, or parentheses:</p>
+<pre><code class="language-example">[link](/url &quot;title&quot;)
+[link](/url 'title')
+[link](/url (title))
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;link&lt;/a&gt;
+&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;link&lt;/a&gt;
+&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Backslash escapes and entity and numeric character references
+may be used in titles:</p>
+<pre><code class="language-example">[link](/url &quot;title \&quot;&amp;quot;&quot;)
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot; title=&quot;title &amp;quot;&amp;quot;&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Titles must be separated from the link using spaces, tabs, and up to one line
+ending.
+Other [Unicode whitespace] like non-breaking space doesn't work.</p>
+<pre><code class="language-example">[link](/url &quot;title&quot;)
+.
+&lt;p&gt;&lt;a href=&quot;/url%C2%A0%22title%22&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Nested balanced quotes are not allowed without escaping:</p>
+<pre><code class="language-example">[link](/url &quot;title &quot;and&quot; title&quot;)
+.
+&lt;p&gt;[link](/url &amp;quot;title &amp;quot;and&amp;quot; title&amp;quot;)&lt;/p&gt;
+</code></pre>
+<p>But it is easy to work around this by using a different quote type:</p>
+<pre><code class="language-example">[link](/url 'title &quot;and&quot; title')
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot; title=&quot;title &amp;quot;and&amp;quot; title&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>(Note:  <code>Markdown.pl</code> did allow double quotes inside a double-quoted
+title, and its test suite included a test demonstrating this.
+But it is hard to see a good rationale for the extra complexity this
+brings, since there are already many ways---backslash escaping,
+entity and numeric character references, or using a different
+quote type for the enclosing title---to write titles containing
+double quotes.  <code>Markdown.pl</code>'s handling of titles has a number
+of other strange features.  For example, it allows single-quoted
+titles in inline links, but not reference links.  And, in
+reference links but not inline links, it allows a title to begin
+with <code>&quot;</code> and end with <code>)</code>.  <code>Markdown.pl</code> 1.0.1 even allows
+titles with no closing quotation mark, though 1.0.2b8 does not.
+It seems preferable to adopt a simple, rational rule that works
+the same way in inline links and link reference definitions.)</p>
+<p>Spaces, tabs, and up to one line ending is allowed around the destination and
+title:</p>
+<pre><code class="language-example">[link](   /uri
+  &quot;title&quot;  )
+.
+&lt;p&gt;&lt;a href=&quot;/uri&quot; title=&quot;title&quot;&gt;link&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>But it is not allowed between the link text and the
+following parenthesis:</p>
+<pre><code class="language-example">[link] (/uri)
+.
+&lt;p&gt;[link] (/uri)&lt;/p&gt;
+</code></pre>
+<p>The link text may contain balanced brackets, but not unbalanced ones,
+unless they are escaped:</p>
+<pre><code class="language-example">[link [foo [bar]]](/uri)
+.
+&lt;p&gt;&lt;a href=&quot;/uri&quot;&gt;link [foo [bar]]&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[link] bar](/uri)
+.
+&lt;p&gt;[link] bar](/uri)&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[link [bar](/uri)
+.
+&lt;p&gt;[link &lt;a href=&quot;/uri&quot;&gt;bar&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[link \[bar](/uri)
+.
+&lt;p&gt;&lt;a href=&quot;/uri&quot;&gt;link [bar&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>The link text may contain inline content:</p>
+<pre><code class="language-example">[link *foo **bar** `#`*](/uri)
+.
+&lt;p&gt;&lt;a href=&quot;/uri&quot;&gt;link &lt;em&gt;foo &lt;strong&gt;bar&lt;/strong&gt; &lt;code&gt;#&lt;/code&gt;&lt;/em&gt;&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[![moon](moon.jpg)](/uri)
+.
+&lt;p&gt;&lt;a href=&quot;/uri&quot;&gt;&lt;img src=&quot;moon.jpg&quot; alt=&quot;moon&quot; /&gt;&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>However, links may not contain other links, at any level of nesting.</p>
+<pre><code class="language-example">[foo [bar](/uri)](/uri)
+.
+&lt;p&gt;[foo &lt;a href=&quot;/uri&quot;&gt;bar&lt;/a&gt;](/uri)&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo *[bar [baz](/uri)](/uri)*](/uri)
+.
+&lt;p&gt;[foo &lt;em&gt;[bar &lt;a href=&quot;/uri&quot;&gt;baz&lt;/a&gt;](/uri)&lt;/em&gt;](/uri)&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">![[[foo](uri1)](uri2)](uri3)
+.
+&lt;p&gt;&lt;img src=&quot;uri3&quot; alt=&quot;[foo](uri2)&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<p>These cases illustrate the precedence of link text grouping over
+emphasis grouping:</p>
+<pre><code class="language-example">*[foo*](/uri)
+.
+&lt;p&gt;*&lt;a href=&quot;/uri&quot;&gt;foo*&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo *bar](baz*)
+.
+&lt;p&gt;&lt;a href=&quot;baz*&quot;&gt;foo *bar&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Note that brackets that <em>aren't</em> part of links do not take
+precedence:</p>
+<pre><code class="language-example">*foo [bar* baz]
+.
+&lt;p&gt;&lt;em&gt;foo [bar&lt;/em&gt; baz]&lt;/p&gt;
+</code></pre>
+<p>These cases illustrate the precedence of HTML tags, code spans,
+and autolinks over link grouping:</p>
+<pre><code class="language-example">[foo &lt;bar attr=&quot;](baz)&quot;&gt;
+.
+&lt;p&gt;[foo &lt;bar attr=&quot;](baz)&quot;&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo`](/uri)`
+.
+&lt;p&gt;[foo&lt;code&gt;](/uri)&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo&lt;http://example.com/?search=](uri)&gt;
+.
+&lt;p&gt;[foo&lt;a href=&quot;http://example.com/?search=%5D(uri)&quot;&gt;http://example.com/?search=](uri)&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>There are three kinds of <a href="@">reference link</a>s:
+<a href="#full-reference-link">full</a>, <a href="#collapsed-reference-link">collapsed</a>,
+and <a href="#shortcut-reference-link">shortcut</a>.</p>
+<p>A <a href="@">full reference link</a>
+consists of a [link text] immediately followed by a [link label]
+that [matches] a [link reference definition] elsewhere in the document.</p>
+<p>A <a href="@">link label</a>  begins with a left bracket (<code>[</code>) and ends
+with the first right bracket (<code>]</code>) that is not backslash-escaped.
+Between these brackets there must be at least one character that is not a space,
+tab, or line ending.
+Unescaped square bracket characters are not allowed inside the
+opening and closing square brackets of [link labels].  A link
+label can have at most 999 characters inside the square
+brackets.</p>
+<p>One label <a href="@">matches</a>
+another just in case their normalized forms are equal.  To normalize a
+label, strip off the opening and closing brackets,
+perform the <em>Unicode case fold</em>, strip leading and trailing
+spaces, tabs, and line endings, and collapse consecutive internal
+spaces, tabs, and line endings to a single space.  If there are multiple
+matching reference link definitions, the one that comes first in the
+document is used.  (It is desirable in such cases to emit a warning.)</p>
+<p>The link's URI and title are provided by the matching [link
+reference definition].</p>
+<p>Here is a simple example:</p>
+<pre><code class="language-example">[foo][bar]
+
+[bar]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>The rules for the [link text] are the same as with
+[inline links].  Thus:</p>
+<p>The link text may contain balanced brackets, but not unbalanced ones,
+unless they are escaped:</p>
+<pre><code class="language-example">[link [foo [bar]]][ref]
+
+[ref]: /uri
+.
+&lt;p&gt;&lt;a href=&quot;/uri&quot;&gt;link [foo [bar]]&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[link \[bar][ref]
+
+[ref]: /uri
+.
+&lt;p&gt;&lt;a href=&quot;/uri&quot;&gt;link [bar&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>The link text may contain inline content:</p>
+<pre><code class="language-example">[link *foo **bar** `#`*][ref]
+
+[ref]: /uri
+.
+&lt;p&gt;&lt;a href=&quot;/uri&quot;&gt;link &lt;em&gt;foo &lt;strong&gt;bar&lt;/strong&gt; &lt;code&gt;#&lt;/code&gt;&lt;/em&gt;&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[![moon](moon.jpg)][ref]
+
+[ref]: /uri
+.
+&lt;p&gt;&lt;a href=&quot;/uri&quot;&gt;&lt;img src=&quot;moon.jpg&quot; alt=&quot;moon&quot; /&gt;&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>However, links may not contain other links, at any level of nesting.</p>
+<pre><code class="language-example">[foo [bar](/uri)][ref]
+
+[ref]: /uri
+.
+&lt;p&gt;[foo &lt;a href=&quot;/uri&quot;&gt;bar&lt;/a&gt;]&lt;a href=&quot;/uri&quot;&gt;ref&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo *bar [baz][ref]*][ref]
+
+[ref]: /uri
+.
+&lt;p&gt;[foo &lt;em&gt;bar &lt;a href=&quot;/uri&quot;&gt;baz&lt;/a&gt;&lt;/em&gt;]&lt;a href=&quot;/uri&quot;&gt;ref&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>(In the examples above, we have two [shortcut reference links]
+instead of one [full reference link].)</p>
+<p>The following cases illustrate the precedence of link text grouping over
+emphasis grouping:</p>
+<pre><code class="language-example">*[foo*][ref]
+
+[ref]: /uri
+.
+&lt;p&gt;*&lt;a href=&quot;/uri&quot;&gt;foo*&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo *bar][ref]*
+
+[ref]: /uri
+.
+&lt;p&gt;&lt;a href=&quot;/uri&quot;&gt;foo *bar&lt;/a&gt;*&lt;/p&gt;
+</code></pre>
+<p>These cases illustrate the precedence of HTML tags, code spans,
+and autolinks over link grouping:</p>
+<pre><code class="language-example">[foo &lt;bar attr=&quot;][ref]&quot;&gt;
+
+[ref]: /uri
+.
+&lt;p&gt;[foo &lt;bar attr=&quot;][ref]&quot;&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo`][ref]`
+
+[ref]: /uri
+.
+&lt;p&gt;[foo&lt;code&gt;][ref]&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo&lt;http://example.com/?search=][ref]&gt;
+
+[ref]: /uri
+.
+&lt;p&gt;[foo&lt;a href=&quot;http://example.com/?search=%5D%5Bref%5D&quot;&gt;http://example.com/?search=][ref]&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Matching is case-insensitive:</p>
+<pre><code class="language-example">[foo][BaR]
+
+[bar]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Unicode case fold is used:</p>
+<pre><code class="language-example">[ẞ]
+
+[SS]: /url
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot;&gt;ẞ&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Consecutive internal spaces, tabs, and line endings are treated as one space for
+purposes of determining matching:</p>
+<pre><code class="language-example">[Foo
+  bar]: /url
+
+[Baz][Foo bar]
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot;&gt;Baz&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>No spaces, tabs, or line endings are allowed between the [link text] and the
+[link label]:</p>
+<pre><code class="language-example">[foo] [bar]
+
+[bar]: /url &quot;title&quot;
+.
+&lt;p&gt;[foo] &lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;bar&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo]
+[bar]
+
+[bar]: /url &quot;title&quot;
+.
+&lt;p&gt;[foo]
+&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;bar&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>This is a departure from John Gruber's original Markdown syntax
+description, which explicitly allows whitespace between the link
+text and the link label.  It brings reference links in line with
+[inline links], which (according to both original Markdown and
+this spec) cannot have whitespace after the link text.  More
+importantly, it prevents inadvertent capture of consecutive
+[shortcut reference links]. If whitespace is allowed between the
+link text and the link label, then in the following we will have
+a single reference link, not two shortcut reference links, as
+intended:</p>
+<pre><code class="language-markdown">[foo]
+[bar]
+
+[foo]: /url1
+[bar]: /url2
+</code></pre>
+<p>(Note that [shortcut reference links] were introduced by Gruber
+himself in a beta version of <code>Markdown.pl</code>, but never included
+in the official syntax description.  Without shortcut reference
+links, it is harmless to allow space between the link text and
+link label; but once shortcut references are introduced, it is
+too dangerous to allow this, as it frequently leads to
+unintended results.)</p>
+<p>When there are multiple matching [link reference definitions],
+the first is used:</p>
+<pre><code class="language-example">[foo]: /url1
+
+[foo]: /url2
+
+[bar][foo]
+.
+&lt;p&gt;&lt;a href=&quot;/url1&quot;&gt;bar&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Note that matching is performed on normalized strings, not parsed
+inline content.  So the following does not match, even though the
+labels define equivalent inline content:</p>
+<pre><code class="language-example">[bar][foo\!]
+
+[foo!]: /url
+.
+&lt;p&gt;[bar][foo!]&lt;/p&gt;
+</code></pre>
+<p>[Link labels] cannot contain brackets, unless they are
+backslash-escaped:</p>
+<pre><code class="language-example">[foo][ref[]
+
+[ref[]: /uri
+.
+&lt;p&gt;[foo][ref[]&lt;/p&gt;
+&lt;p&gt;[ref[]: /uri&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo][ref[bar]]
+
+[ref[bar]]: /uri
+.
+&lt;p&gt;[foo][ref[bar]]&lt;/p&gt;
+&lt;p&gt;[ref[bar]]: /uri&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[[[foo]]]
+
+[[[foo]]]: /url
+.
+&lt;p&gt;[[[foo]]]&lt;/p&gt;
+&lt;p&gt;[[[foo]]]: /url&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo][ref\[]
+
+[ref\[]: /uri
+.
+&lt;p&gt;&lt;a href=&quot;/uri&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Note that in this example <code>]</code> is not backslash-escaped:</p>
+<pre><code class="language-example">[bar\\]: /uri
+
+[bar\\]
+.
+&lt;p&gt;&lt;a href=&quot;/uri&quot;&gt;bar\&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>A [link label] must contain at least one character that is not a space, tab, or
+line ending:</p>
+<pre><code class="language-example">[]
+
+[]: /uri
+.
+&lt;p&gt;[]&lt;/p&gt;
+&lt;p&gt;[]: /uri&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[
+ ]
+
+[
+ ]: /uri
+.
+&lt;p&gt;[
+]&lt;/p&gt;
+&lt;p&gt;[
+]: /uri&lt;/p&gt;
+</code></pre>
+<p>A <a href="@">collapsed reference link</a>
+consists of a [link label] that [matches] a
+[link reference definition] elsewhere in the
+document, followed by the string <code>[]</code>.
+The contents of the first link label are parsed as inlines,
+which are used as the link's text.  The link's URI and title are
+provided by the matching reference link definition.  Thus,
+<code>[foo][]</code> is equivalent to <code>[foo][foo]</code>.</p>
+<pre><code class="language-example">[foo][]
+
+[foo]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[*foo* bar][]
+
+[*foo* bar]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;&lt;em&gt;foo&lt;/em&gt; bar&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>The link labels are case-insensitive:</p>
+<pre><code class="language-example">[Foo][]
+
+[foo]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;Foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>As with full reference links, spaces, tabs, or line endings are not
+allowed between the two sets of brackets:</p>
+<pre><code class="language-example">[foo] 
+[]
+
+[foo]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;foo&lt;/a&gt;
+[]&lt;/p&gt;
+</code></pre>
+<p>A <a href="@">shortcut reference link</a>
+consists of a [link label] that [matches] a
+[link reference definition] elsewhere in the
+document and is not followed by <code>[]</code> or a link label.
+The contents of the first link label are parsed as inlines,
+which are used as the link's text.  The link's URI and title
+are provided by the matching link reference definition.
+Thus, <code>[foo]</code> is equivalent to <code>[foo][]</code>.</p>
+<pre><code class="language-example">[foo]
+
+[foo]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[*foo* bar]
+
+[*foo* bar]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;&lt;em&gt;foo&lt;/em&gt; bar&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[[*foo* bar]]
+
+[*foo* bar]: /url &quot;title&quot;
+.
+&lt;p&gt;[&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;&lt;em&gt;foo&lt;/em&gt; bar&lt;/a&gt;]&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[[bar [foo]
+
+[foo]: /url
+.
+&lt;p&gt;[[bar &lt;a href=&quot;/url&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>The link labels are case-insensitive:</p>
+<pre><code class="language-example">[Foo]
+
+[foo]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;Foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>A space after the link text should be preserved:</p>
+<pre><code class="language-example">[foo] bar
+
+[foo]: /url
+.
+&lt;p&gt;&lt;a href=&quot;/url&quot;&gt;foo&lt;/a&gt; bar&lt;/p&gt;
+</code></pre>
+<p>If you just want bracketed text, you can backslash-escape the
+opening bracket to avoid links:</p>
+<pre><code class="language-example">\[foo]
+
+[foo]: /url &quot;title&quot;
+.
+&lt;p&gt;[foo]&lt;/p&gt;
+</code></pre>
+<p>Note that this is a link, because a link label ends with the first
+following closing bracket:</p>
+<pre><code class="language-example">[foo*]: /url
+
+*[foo*]
+.
+&lt;p&gt;*&lt;a href=&quot;/url&quot;&gt;foo*&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Full and compact references take precedence over shortcut
+references:</p>
+<pre><code class="language-example">[foo][bar]
+
+[foo]: /url1
+[bar]: /url2
+.
+&lt;p&gt;&lt;a href=&quot;/url2&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo][]
+
+[foo]: /url1
+.
+&lt;p&gt;&lt;a href=&quot;/url1&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Inline links also take precedence:</p>
+<pre><code class="language-example">[foo]()
+
+[foo]: /url1
+.
+&lt;p&gt;&lt;a href=&quot;&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">[foo](not a link)
+
+[foo]: /url1
+.
+&lt;p&gt;&lt;a href=&quot;/url1&quot;&gt;foo&lt;/a&gt;(not a link)&lt;/p&gt;
+</code></pre>
+<p>In the following case <code>[bar][baz]</code> is parsed as a reference,
+<code>[foo]</code> as normal text:</p>
+<pre><code class="language-example">[foo][bar][baz]
+
+[baz]: /url
+.
+&lt;p&gt;[foo]&lt;a href=&quot;/url&quot;&gt;bar&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Here, though, <code>[foo][bar]</code> is parsed as a reference, since
+<code>[bar]</code> is defined:</p>
+<pre><code class="language-example">[foo][bar][baz]
+
+[baz]: /url1
+[bar]: /url2
+.
+&lt;p&gt;&lt;a href=&quot;/url2&quot;&gt;foo&lt;/a&gt;&lt;a href=&quot;/url1&quot;&gt;baz&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Here <code>[foo]</code> is not parsed as a shortcut reference, because it
+is followed by a link label (even though <code>[bar]</code> is not defined):</p>
+<pre><code class="language-example">[foo][bar][baz]
+
+[baz]: /url1
+[foo]: /url2
+.
+&lt;p&gt;[foo]&lt;a href=&quot;/url1&quot;&gt;bar&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<h2>Images</h2>
+<p>Syntax for images is like the syntax for links, with one
+difference. Instead of [link text], we have an
+<a href="@">image description</a>.  The rules for this are the
+same as for [link text], except that (a) an
+image description starts with <code>![</code> rather than <code>[</code>, and
+(b) an image description may contain links.
+An image description has inline elements
+as its contents.  When an image is rendered to HTML,
+this is standardly used as the image's <code>alt</code> attribute.</p>
+<pre><code class="language-example">![foo](/url &quot;title&quot;)
+.
+&lt;p&gt;&lt;img src=&quot;/url&quot; alt=&quot;foo&quot; title=&quot;title&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">![foo *bar*]
+
+[foo *bar*]: train.jpg &quot;train &amp; tracks&quot;
+.
+&lt;p&gt;&lt;img src=&quot;train.jpg&quot; alt=&quot;foo bar&quot; title=&quot;train &amp;amp; tracks&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">![foo ![bar](/url)](/url2)
+.
+&lt;p&gt;&lt;img src=&quot;/url2&quot; alt=&quot;foo bar&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">![foo [bar](/url)](/url2)
+.
+&lt;p&gt;&lt;img src=&quot;/url2&quot; alt=&quot;foo bar&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<p>Though this spec is concerned with parsing, not rendering, it is
+recommended that in rendering to HTML, only the plain string content
+of the [image description] be used.  Note that in
+the above example, the alt attribute's value is <code>foo bar</code>, not <code>foo [bar](/url)</code> or <code>foo &lt;a href=&quot;/url&quot;&gt;bar&lt;/a&gt;</code>.  Only the plain string
+content is rendered, without formatting.</p>
+<pre><code class="language-example">![foo *bar*][]
+
+[foo *bar*]: train.jpg &quot;train &amp; tracks&quot;
+.
+&lt;p&gt;&lt;img src=&quot;train.jpg&quot; alt=&quot;foo bar&quot; title=&quot;train &amp;amp; tracks&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">![foo *bar*][foobar]
+
+[FOOBAR]: train.jpg &quot;train &amp; tracks&quot;
+.
+&lt;p&gt;&lt;img src=&quot;train.jpg&quot; alt=&quot;foo bar&quot; title=&quot;train &amp;amp; tracks&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">![foo](train.jpg)
+.
+&lt;p&gt;&lt;img src=&quot;train.jpg&quot; alt=&quot;foo&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">My ![foo bar](/path/to/train.jpg  &quot;title&quot;   )
+.
+&lt;p&gt;My &lt;img src=&quot;/path/to/train.jpg&quot; alt=&quot;foo bar&quot; title=&quot;title&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">![foo](&lt;url&gt;)
+.
+&lt;p&gt;&lt;img src=&quot;url&quot; alt=&quot;foo&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">![](/url)
+.
+&lt;p&gt;&lt;img src=&quot;/url&quot; alt=&quot;&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<p>Reference-style:</p>
+<pre><code class="language-example">![foo][bar]
+
+[bar]: /url
+.
+&lt;p&gt;&lt;img src=&quot;/url&quot; alt=&quot;foo&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">![foo][bar]
+
+[BAR]: /url
+.
+&lt;p&gt;&lt;img src=&quot;/url&quot; alt=&quot;foo&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<p>Collapsed:</p>
+<pre><code class="language-example">![foo][]
+
+[foo]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;img src=&quot;/url&quot; alt=&quot;foo&quot; title=&quot;title&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">![*foo* bar][]
+
+[*foo* bar]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;img src=&quot;/url&quot; alt=&quot;foo bar&quot; title=&quot;title&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<p>The labels are case-insensitive:</p>
+<pre><code class="language-example">![Foo][]
+
+[foo]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;img src=&quot;/url&quot; alt=&quot;Foo&quot; title=&quot;title&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<p>As with reference links, spaces, tabs, and line endings, are not allowed
+between the two sets of brackets:</p>
+<pre><code class="language-example">![foo] 
+[]
+
+[foo]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;img src=&quot;/url&quot; alt=&quot;foo&quot; title=&quot;title&quot; /&gt;
+[]&lt;/p&gt;
+</code></pre>
+<p>Shortcut:</p>
+<pre><code class="language-example">![foo]
+
+[foo]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;img src=&quot;/url&quot; alt=&quot;foo&quot; title=&quot;title&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">![*foo* bar]
+
+[*foo* bar]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;img src=&quot;/url&quot; alt=&quot;foo bar&quot; title=&quot;title&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<p>Note that link labels cannot contain unescaped brackets:</p>
+<pre><code class="language-example">![[foo]]
+
+[[foo]]: /url &quot;title&quot;
+.
+&lt;p&gt;![[foo]]&lt;/p&gt;
+&lt;p&gt;[[foo]]: /url &amp;quot;title&amp;quot;&lt;/p&gt;
+</code></pre>
+<p>The link labels are case-insensitive:</p>
+<pre><code class="language-example">![Foo]
+
+[foo]: /url &quot;title&quot;
+.
+&lt;p&gt;&lt;img src=&quot;/url&quot; alt=&quot;Foo&quot; title=&quot;title&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<p>If you just want a literal <code>!</code> followed by bracketed text, you can
+backslash-escape the opening <code>[</code>:</p>
+<pre><code class="language-example">!\[foo]
+
+[foo]: /url &quot;title&quot;
+.
+&lt;p&gt;![foo]&lt;/p&gt;
+</code></pre>
+<p>If you want a link after a literal <code>!</code>, backslash-escape the
+<code>!</code>:</p>
+<pre><code class="language-example">\![foo]
+
+[foo]: /url &quot;title&quot;
+.
+&lt;p&gt;!&lt;a href=&quot;/url&quot; title=&quot;title&quot;&gt;foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<h2>Autolinks</h2>
+<p><a href="@">Autolink</a>s are absolute URIs and email addresses inside
+<code>&lt;</code> and <code>&gt;</code>. They are parsed as links, with the URL or email address
+as the link label.</p>
+<p>A <a href="@">URI autolink</a> consists of <code>&lt;</code>, followed by an
+[absolute URI] followed by <code>&gt;</code>.  It is parsed as
+a link to the URI, with the URI as the link's label.</p>
+<p>An <a href="@">absolute URI</a>,
+for these purposes, consists of a [scheme] followed by a colon (<code>:</code>)
+followed by zero or more characters other [ASCII control
+characters][ASCII control character], [space], <code>&lt;</code>, and <code>&gt;</code>.
+If the URI includes these characters, they must be percent-encoded
+(e.g. <code>%20</code> for a space).</p>
+<p>For purposes of this spec, a <a href="@">scheme</a> is any sequence
+of 2--32 characters beginning with an ASCII letter and followed
+by any combination of ASCII letters, digits, or the symbols plus
+(&quot;+&quot;), period (&quot;.&quot;), or hyphen (&quot;-&quot;).</p>
+<p>Here are some valid autolinks:</p>
+<pre><code class="language-example">&lt;http://foo.bar.baz&gt;
+.
+&lt;p&gt;&lt;a href=&quot;http://foo.bar.baz&quot;&gt;http://foo.bar.baz&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&lt;http://foo.bar.baz/test?q=hello&amp;id=22&amp;boolean&gt;
+.
+&lt;p&gt;&lt;a href=&quot;http://foo.bar.baz/test?q=hello&amp;amp;id=22&amp;amp;boolean&quot;&gt;http://foo.bar.baz/test?q=hello&amp;amp;id=22&amp;amp;boolean&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&lt;irc://foo.bar:2233/baz&gt;
+.
+&lt;p&gt;&lt;a href=&quot;irc://foo.bar:2233/baz&quot;&gt;irc://foo.bar:2233/baz&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Uppercase is also fine:</p>
+<pre><code class="language-example">&lt;MAILTO:FOO@BAR.BAZ&gt;
+.
+&lt;p&gt;&lt;a href=&quot;MAILTO:FOO@BAR.BAZ&quot;&gt;MAILTO:FOO@BAR.BAZ&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Note that many strings that count as [absolute URIs] for
+purposes of this spec are not valid URIs, because their
+schemes are not registered or because of other problems
+with their syntax:</p>
+<pre><code class="language-example">&lt;a+b+c:d&gt;
+.
+&lt;p&gt;&lt;a href=&quot;a+b+c:d&quot;&gt;a+b+c:d&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&lt;made-up-scheme://foo,bar&gt;
+.
+&lt;p&gt;&lt;a href=&quot;made-up-scheme://foo,bar&quot;&gt;made-up-scheme://foo,bar&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&lt;http://../&gt;
+.
+&lt;p&gt;&lt;a href=&quot;http://../&quot;&gt;http://../&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&lt;localhost:5001/foo&gt;
+.
+&lt;p&gt;&lt;a href=&quot;localhost:5001/foo&quot;&gt;localhost:5001/foo&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Spaces are not allowed in autolinks:</p>
+<pre><code class="language-example">&lt;http://foo.bar/baz bim&gt;
+.
+&lt;p&gt;&amp;lt;http://foo.bar/baz bim&amp;gt;&lt;/p&gt;
+</code></pre>
+<p>Backslash-escapes do not work inside autolinks:</p>
+<pre><code class="language-example">&lt;http://example.com/\[\&gt;
+.
+&lt;p&gt;&lt;a href=&quot;http://example.com/%5C%5B%5C&quot;&gt;http://example.com/\[\&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>An <a href="@">email autolink</a>
+consists of <code>&lt;</code>, followed by an [email address],
+followed by <code>&gt;</code>.  The link's label is the email address,
+and the URL is <code>mailto:</code> followed by the email address.</p>
+<p>An <a href="@">email address</a>,
+for these purposes, is anything that matches
+the <a href="https://html.spec.whatwg.org/multipage/forms.html#e-mail-state-(type=email)">non-normative regex from the HTML5
+spec</a>:</p>
+<pre><code>/^[a-zA-Z0-9.!#$%&amp;'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?
+(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/
+</code></pre>
+<p>Examples of email autolinks:</p>
+<pre><code class="language-example">&lt;foo@bar.example.com&gt;
+.
+&lt;p&gt;&lt;a href=&quot;mailto:foo@bar.example.com&quot;&gt;foo@bar.example.com&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&lt;foo+special@Bar.baz-bar0.com&gt;
+.
+&lt;p&gt;&lt;a href=&quot;mailto:foo+special@Bar.baz-bar0.com&quot;&gt;foo+special@Bar.baz-bar0.com&lt;/a&gt;&lt;/p&gt;
+</code></pre>
+<p>Backslash-escapes do not work inside email autolinks:</p>
+<pre><code class="language-example">&lt;foo\+@bar.example.com&gt;
+.
+&lt;p&gt;&amp;lt;foo+@bar.example.com&amp;gt;&lt;/p&gt;
+</code></pre>
+<p>These are not autolinks:</p>
+<pre><code class="language-example">&lt;&gt;
+.
+&lt;p&gt;&amp;lt;&amp;gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&lt; http://foo.bar &gt;
+.
+&lt;p&gt;&amp;lt; http://foo.bar &amp;gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&lt;m:abc&gt;
+.
+&lt;p&gt;&amp;lt;m:abc&amp;gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&lt;foo.bar.baz&gt;
+.
+&lt;p&gt;&amp;lt;foo.bar.baz&amp;gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">http://example.com
+.
+&lt;p&gt;http://example.com&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">foo@bar.example.com
+.
+&lt;p&gt;foo@bar.example.com&lt;/p&gt;
+</code></pre>
+<h2>Raw HTML</h2>
+<p>Text between <code>&lt;</code> and <code>&gt;</code> that looks like an HTML tag is parsed as a
+raw HTML tag and will be rendered in HTML without escaping.
+Tag and attribute names are not limited to current HTML tags,
+so custom tags (and even, say, DocBook tags) may be used.</p>
+<p>Here is the grammar for tags:</p>
+<p>A <a href="@">tag name</a> consists of an ASCII letter
+followed by zero or more ASCII letters, digits, or
+hyphens (<code>-</code>).</p>
+<p>An <a href="@">attribute</a> consists of spaces, tabs, and up to one line ending,
+an [attribute name], and an optional
+[attribute value specification].</p>
+<p>An <a href="@">attribute name</a>
+consists of an ASCII letter, <code>_</code>, or <code>:</code>, followed by zero or more ASCII
+letters, digits, <code>_</code>, <code>.</code>, <code>:</code>, or <code>-</code>.  (Note:  This is the XML
+specification restricted to ASCII.  HTML5 is laxer.)</p>
+<p>An <a href="@">attribute value specification</a>
+consists of optional spaces, tabs, and up to one line ending,
+a <code>=</code> character, optional spaces, tabs, and up to one line ending,
+and an [attribute value].</p>
+<p>An <a href="@">attribute value</a>
+consists of an [unquoted attribute value],
+a [single-quoted attribute value], or a [double-quoted attribute value].</p>
+<p>An <a href="@">unquoted attribute value</a>
+is a nonempty string of characters not
+including spaces, tabs, line endings, <code>&quot;</code>, <code>'</code>, <code>=</code>, <code>&lt;</code>, <code>&gt;</code>, or <code>`</code>.</p>
+<p>A <a href="@">single-quoted attribute value</a>
+consists of <code>'</code>, zero or more
+characters not including <code>'</code>, and a final <code>'</code>.</p>
+<p>A <a href="@">double-quoted attribute value</a>
+consists of <code>&quot;</code>, zero or more
+characters not including <code>&quot;</code>, and a final <code>&quot;</code>.</p>
+<p>An <a href="@">open tag</a> consists of a <code>&lt;</code> character, a [tag name],
+zero or more [attributes], optional spaces, tabs, and up to one line ending,
+an optional <code>/</code> character, and a <code>&gt;</code> character.</p>
+<p>A <a href="@">closing tag</a> consists of the string <code>&lt;/</code>, a
+[tag name], optional spaces, tabs, and up to one line ending, and the character
+<code>&gt;</code>.</p>
+<p>An <a href="@">HTML comment</a> consists of <code>&lt;!--</code> + <em>text</em> + <code>--&gt;</code>,
+where <em>text</em> does not start with <code>&gt;</code> or <code>-&gt;</code>, does not end with <code>-</code>,
+and does not contain <code>--</code>.  (See the
+<a href="http://www.w3.org/TR/html5/syntax.html#comments">HTML5 spec</a>.)</p>
+<p>A <a href="@">processing instruction</a>
+consists of the string <code>&lt;?</code>, a string
+of characters not including the string <code>?&gt;</code>, and the string
+<code>?&gt;</code>.</p>
+<p>A <a href="@">declaration</a> consists of the string <code>&lt;!</code>, an ASCII letter, zero or more
+characters not including the character <code>&gt;</code>, and the character <code>&gt;</code>.</p>
+<p>A <a href="@">CDATA section</a> consists of
+the string <code>&lt;![CDATA[</code>, a string of characters not including the string
+<code>]]&gt;</code>, and the string <code>]]&gt;</code>.</p>
+<p>An <a href="@">HTML tag</a> consists of an [open tag], a [closing tag],
+an [HTML comment], a [processing instruction], a [declaration],
+or a [CDATA section].</p>
+<p>Here are some simple open tags:</p>
+<pre><code class="language-example">&lt;a&gt;&lt;bab&gt;&lt;c2c&gt;
+.
+&lt;p&gt;&lt;a&gt;&lt;bab&gt;&lt;c2c&gt;&lt;/p&gt;
+</code></pre>
+<p>Empty elements:</p>
+<pre><code class="language-example">&lt;a/&gt;&lt;b2/&gt;
+.
+&lt;p&gt;&lt;a/&gt;&lt;b2/&gt;&lt;/p&gt;
+</code></pre>
+<p>Whitespace is allowed:</p>
+<pre><code class="language-example">&lt;a  /&gt;&lt;b2
+data=&quot;foo&quot; &gt;
+.
+&lt;p&gt;&lt;a  /&gt;&lt;b2
+data=&quot;foo&quot; &gt;&lt;/p&gt;
+</code></pre>
+<p>With attributes:</p>
+<pre><code class="language-example">&lt;a foo=&quot;bar&quot; bam = 'baz &lt;em&gt;&quot;&lt;/em&gt;'
+_boolean zoop:33=zoop:33 /&gt;
+.
+&lt;p&gt;&lt;a foo=&quot;bar&quot; bam = 'baz &lt;em&gt;&quot;&lt;/em&gt;'
+_boolean zoop:33=zoop:33 /&gt;&lt;/p&gt;
+</code></pre>
+<p>Custom tag names can be used:</p>
+<pre><code class="language-example">Foo &lt;responsive-image src=&quot;foo.jpg&quot; /&gt;
+.
+&lt;p&gt;Foo &lt;responsive-image src=&quot;foo.jpg&quot; /&gt;&lt;/p&gt;
+</code></pre>
+<p>Illegal tag names, not parsed as HTML:</p>
+<pre><code class="language-example">&lt;33&gt; &lt;__&gt;
+.
+&lt;p&gt;&amp;lt;33&amp;gt; &amp;lt;__&amp;gt;&lt;/p&gt;
+</code></pre>
+<p>Illegal attribute names:</p>
+<pre><code class="language-example">&lt;a h*#ref=&quot;hi&quot;&gt;
+.
+&lt;p&gt;&amp;lt;a h*#ref=&amp;quot;hi&amp;quot;&amp;gt;&lt;/p&gt;
+</code></pre>
+<p>Illegal attribute values:</p>
+<pre><code class="language-example">&lt;a href=&quot;hi'&gt; &lt;a href=hi'&gt;
+.
+&lt;p&gt;&amp;lt;a href=&amp;quot;hi'&amp;gt; &amp;lt;a href=hi'&amp;gt;&lt;/p&gt;
+</code></pre>
+<p>Illegal whitespace:</p>
+<pre><code class="language-example">&lt; a&gt;&lt;
+foo&gt;&lt;bar/ &gt;
+&lt;foo bar=baz
+bim!bop /&gt;
+.
+&lt;p&gt;&amp;lt; a&amp;gt;&amp;lt;
+foo&amp;gt;&amp;lt;bar/ &amp;gt;
+&amp;lt;foo bar=baz
+bim!bop /&amp;gt;&lt;/p&gt;
+</code></pre>
+<p>Missing whitespace:</p>
+<pre><code class="language-example">&lt;a href='bar'title=title&gt;
+.
+&lt;p&gt;&amp;lt;a href='bar'title=title&amp;gt;&lt;/p&gt;
+</code></pre>
+<p>Closing tags:</p>
+<pre><code class="language-example">&lt;/a&gt;&lt;/foo &gt;
+.
+&lt;p&gt;&lt;/a&gt;&lt;/foo &gt;&lt;/p&gt;
+</code></pre>
+<p>Illegal attributes in closing tag:</p>
+<pre><code class="language-example">&lt;/a href=&quot;foo&quot;&gt;
+.
+&lt;p&gt;&amp;lt;/a href=&amp;quot;foo&amp;quot;&amp;gt;&lt;/p&gt;
+</code></pre>
+<p>Comments:</p>
+<pre><code class="language-example">foo &lt;!-- this is a
+comment - with hyphen --&gt;
+.
+&lt;p&gt;foo &lt;!-- this is a
+comment - with hyphen --&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">foo &lt;!-- not a comment -- two hyphens --&gt;
+.
+&lt;p&gt;foo &amp;lt;!-- not a comment -- two hyphens --&amp;gt;&lt;/p&gt;
+</code></pre>
+<p>Not comments:</p>
+<pre><code class="language-example">foo &lt;!--&gt; foo --&gt;
+
+foo &lt;!-- foo---&gt;
+.
+&lt;p&gt;foo &amp;lt;!--&amp;gt; foo --&amp;gt;&lt;/p&gt;
+&lt;p&gt;foo &amp;lt;!-- foo---&amp;gt;&lt;/p&gt;
+</code></pre>
+<p>Processing instructions:</p>
+<pre><code class="language-example">foo &lt;?php echo $a; ?&gt;
+.
+&lt;p&gt;foo &lt;?php echo $a; ?&gt;&lt;/p&gt;
+</code></pre>
+<p>Declarations:</p>
+<pre><code class="language-example">foo &lt;!ELEMENT br EMPTY&gt;
+.
+&lt;p&gt;foo &lt;!ELEMENT br EMPTY&gt;&lt;/p&gt;
+</code></pre>
+<p>CDATA sections:</p>
+<pre><code class="language-example">foo &lt;![CDATA[&gt;&amp;&lt;]]&gt;
+.
+&lt;p&gt;foo &lt;![CDATA[&gt;&amp;&lt;]]&gt;&lt;/p&gt;
+</code></pre>
+<p>Entity and numeric character references are preserved in HTML
+attributes:</p>
+<pre><code class="language-example">foo &lt;a href=&quot;&amp;ouml;&quot;&gt;
+.
+&lt;p&gt;foo &lt;a href=&quot;&amp;ouml;&quot;&gt;&lt;/p&gt;
+</code></pre>
+<p>Backslash escapes do not work in HTML attributes:</p>
+<pre><code class="language-example">foo &lt;a href=&quot;\*&quot;&gt;
+.
+&lt;p&gt;foo &lt;a href=&quot;\*&quot;&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&lt;a href=&quot;\&quot;&quot;&gt;
+.
+&lt;p&gt;&amp;lt;a href=&amp;quot;&amp;quot;&amp;quot;&amp;gt;&lt;/p&gt;
+</code></pre>
+<h2>Hard line breaks</h2>
+<p>A line ending (not in a code span or HTML tag) that is preceded
+by two or more spaces and does not occur at the end of a block
+is parsed as a <a href="@">hard line break</a> (rendered
+in HTML as a <code>&lt;br /&gt;</code> tag):</p>
+<pre><code class="language-example">foo  
+baz
+.
+&lt;p&gt;foo&lt;br /&gt;
+baz&lt;/p&gt;
+</code></pre>
+<p>For a more visible alternative, a backslash before the
+[line ending] may be used instead of two or more spaces:</p>
+<pre><code class="language-example">foo\
+baz
+.
+&lt;p&gt;foo&lt;br /&gt;
+baz&lt;/p&gt;
+</code></pre>
+<p>More than two spaces can be used:</p>
+<pre><code class="language-example">foo       
+baz
+.
+&lt;p&gt;foo&lt;br /&gt;
+baz&lt;/p&gt;
+</code></pre>
+<p>Leading spaces at the beginning of the next line are ignored:</p>
+<pre><code class="language-example">foo  
+     bar
+.
+&lt;p&gt;foo&lt;br /&gt;
+bar&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">foo\
+     bar
+.
+&lt;p&gt;foo&lt;br /&gt;
+bar&lt;/p&gt;
+</code></pre>
+<p>Hard line breaks can occur inside emphasis, links, and other constructs
+that allow inline content:</p>
+<pre><code class="language-example">*foo  
+bar*
+.
+&lt;p&gt;&lt;em&gt;foo&lt;br /&gt;
+bar&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">*foo\
+bar*
+.
+&lt;p&gt;&lt;em&gt;foo&lt;br /&gt;
+bar&lt;/em&gt;&lt;/p&gt;
+</code></pre>
+<p>Hard line breaks do not occur inside code spans</p>
+<pre><code class="language-example">`code  
+span`
+.
+&lt;p&gt;&lt;code&gt;code   span&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">`code\
+span`
+.
+&lt;p&gt;&lt;code&gt;code\ span&lt;/code&gt;&lt;/p&gt;
+</code></pre>
+<p>or HTML tags:</p>
+<pre><code class="language-example">&lt;a href=&quot;foo  
+bar&quot;&gt;
+.
+&lt;p&gt;&lt;a href=&quot;foo  
+bar&quot;&gt;&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">&lt;a href=&quot;foo\
+bar&quot;&gt;
+.
+&lt;p&gt;&lt;a href=&quot;foo\
+bar&quot;&gt;&lt;/p&gt;
+</code></pre>
+<p>Hard line breaks are for separating inline content within a block.
+Neither syntax for hard line breaks works at the end of a paragraph or
+other block element:</p>
+<pre><code class="language-example">foo\
+.
+&lt;p&gt;foo\&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">foo  
+.
+&lt;p&gt;foo&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">### foo\
+.
+&lt;h3&gt;foo\&lt;/h3&gt;
+</code></pre>
+<pre><code class="language-example">### foo  
+.
+&lt;h3&gt;foo&lt;/h3&gt;
+</code></pre>
+<h2>Soft line breaks</h2>
+<p>A regular line ending (not in a code span or HTML tag) that is not
+preceded by two or more spaces or a backslash is parsed as a
+<a href="@">softbreak</a>.  (A soft line break may be rendered in HTML either as a
+[line ending] or as a space. The result will be the same in
+browsers. In the examples here, a [line ending] will be used.)</p>
+<pre><code class="language-example">foo
+baz
+.
+&lt;p&gt;foo
+baz&lt;/p&gt;
+</code></pre>
+<p>Spaces at the end of the line and beginning of the next line are
+removed:</p>
+<pre><code class="language-example">foo 
+ baz
+.
+&lt;p&gt;foo
+baz&lt;/p&gt;
+</code></pre>
+<p>A conforming parser may render a soft line break in HTML either as a
+line ending or as a space.</p>
+<p>A renderer may also provide an option to render soft line breaks
+as hard line breaks.</p>
+<h2>Textual content</h2>
+<p>Any characters not given an interpretation by the above rules will
+be parsed as plain textual content.</p>
+<pre><code class="language-example">hello $.;'there
+.
+&lt;p&gt;hello $.;'there&lt;/p&gt;
+</code></pre>
+<pre><code class="language-example">Foo χρῆν
+.
+&lt;p&gt;Foo χρῆν&lt;/p&gt;
+</code></pre>
+<p>Internal spaces are preserved verbatim:</p>
+<pre><code class="language-example">Multiple     spaces
+.
+&lt;p&gt;Multiple     spaces&lt;/p&gt;
+</code></pre>
+<!-- END TESTS -->
+<h1>Appendix: A parsing strategy</h1>
+<p>In this appendix we describe some features of the parsing strategy
+used in the CommonMark reference implementations.</p>
+<h2>Overview</h2>
+<p>Parsing has two phases:</p>
+<ol>
+<li>
+<p>In the first phase, lines of input are consumed and the block
+structure of the document---its division into paragraphs, block quotes,
+list items, and so on---is constructed.  Text is assigned to these
+blocks but not parsed. Link reference definitions are parsed and a
+map of links is constructed.</p>
+</li>
+<li>
+<p>In the second phase, the raw text contents of paragraphs and headings
+are parsed into sequences of Markdown inline elements (strings,
+code spans, links, emphasis, and so on), using the map of link
+references constructed in phase 1.</p>
+</li>
+</ol>
+<p>At each point in processing, the document is represented as a tree of
+<strong>blocks</strong>.  The root of the tree is a <code>document</code> block.  The <code>document</code>
+may have any number of other blocks as <strong>children</strong>.  These children
+may, in turn, have other blocks as children.  The last child of a block
+is normally considered <strong>open</strong>, meaning that subsequent lines of input
+can alter its contents.  (Blocks that are not open are <strong>closed</strong>.)
+Here, for example, is a possible document tree, with the open blocks
+marked by arrows:</p>
+<pre><code class="language-tree">-&gt; document
+  -&gt; block_quote
+       paragraph
+         &quot;Lorem ipsum dolor\nsit amet.&quot;
+    -&gt; list (type=bullet tight=true bullet_char=-)
+         list_item
+           paragraph
+             &quot;Qui *quodsi iracundia*&quot;
+      -&gt; list_item
+        -&gt; paragraph
+             &quot;aliquando id&quot;
+</code></pre>
+<h2>Phase 1: block structure</h2>
+<p>Each line that is processed has an effect on this tree.  The line is
+analyzed and, depending on its contents, the document may be altered
+in one or more of the following ways:</p>
+<ol>
+<li>One or more open blocks may be closed.</li>
+<li>One or more new blocks may be created as children of the
+last open block.</li>
+<li>Text may be added to the last (deepest) open block remaining
+on the tree.</li>
+</ol>
+<p>Once a line has been incorporated into the tree in this way,
+it can be discarded, so input can be read in a stream.</p>
+<p>For each line, we follow this procedure:</p>
+<ol>
+<li>
+<p>First we iterate through the open blocks, starting with the
+root document, and descending through last children down to the last
+open block.  Each block imposes a condition that the line must satisfy
+if the block is to remain open.  For example, a block quote requires a
+<code>&gt;</code> character.  A paragraph requires a non-blank line.
+In this phase we may match all or just some of the open
+blocks.  But we cannot close unmatched blocks yet, because we may have a
+[lazy continuation line].</p>
+</li>
+<li>
+<p>Next, after consuming the continuation markers for existing
+blocks, we look for new block starts (e.g. <code>&gt;</code> for a block quote).
+If we encounter a new block start, we close any blocks unmatched
+in step 1 before creating the new block as a child of the last
+matched container block.</p>
+</li>
+<li>
+<p>Finally, we look at the remainder of the line (after block
+markers like <code>&gt;</code>, list markers, and indentation have been consumed).
+This is text that can be incorporated into the last open
+block (a paragraph, code block, heading, or raw HTML).</p>
+</li>
+</ol>
+<p>Setext headings are formed when we see a line of a paragraph
+that is a [setext heading underline].</p>
+<p>Reference link definitions are detected when a paragraph is closed;
+the accumulated text lines are parsed to see if they begin with
+one or more reference link definitions.  Any remainder becomes a
+normal paragraph.</p>
+<p>We can see how this works by considering how the tree above is
+generated by four lines of Markdown:</p>
+<pre><code class="language-markdown">&gt; Lorem ipsum dolor
+sit amet.
+&gt; - Qui *quodsi iracundia*
+&gt; - aliquando id
+</code></pre>
+<p>At the outset, our document model is just</p>
+<pre><code class="language-tree">-&gt; document
+</code></pre>
+<p>The first line of our text,</p>
+<pre><code class="language-markdown">&gt; Lorem ipsum dolor
+</code></pre>
+<p>causes a <code>block_quote</code> block to be created as a child of our
+open <code>document</code> block, and a <code>paragraph</code> block as a child of
+the <code>block_quote</code>.  Then the text is added to the last open
+block, the <code>paragraph</code>:</p>
+<pre><code class="language-tree">-&gt; document
+  -&gt; block_quote
+    -&gt; paragraph
+         &quot;Lorem ipsum dolor&quot;
+</code></pre>
+<p>The next line,</p>
+<pre><code class="language-markdown">sit amet.
+</code></pre>
+<p>is a &quot;lazy continuation&quot; of the open <code>paragraph</code>, so it gets added
+to the paragraph's text:</p>
+<pre><code class="language-tree">-&gt; document
+  -&gt; block_quote
+    -&gt; paragraph
+         &quot;Lorem ipsum dolor\nsit amet.&quot;
+</code></pre>
+<p>The third line,</p>
+<pre><code class="language-markdown">&gt; - Qui *quodsi iracundia*
+</code></pre>
+<p>causes the <code>paragraph</code> block to be closed, and a new <code>list</code> block
+opened as a child of the <code>block_quote</code>.  A <code>list_item</code> is also
+added as a child of the <code>list</code>, and a <code>paragraph</code> as a child of
+the <code>list_item</code>.  The text is then added to the new <code>paragraph</code>:</p>
+<pre><code class="language-tree">-&gt; document
+  -&gt; block_quote
+       paragraph
+         &quot;Lorem ipsum dolor\nsit amet.&quot;
+    -&gt; list (type=bullet tight=true bullet_char=-)
+      -&gt; list_item
+        -&gt; paragraph
+             &quot;Qui *quodsi iracundia*&quot;
+</code></pre>
+<p>The fourth line,</p>
+<pre><code class="language-markdown">&gt; - aliquando id
+</code></pre>
+<p>causes the <code>list_item</code> (and its child the <code>paragraph</code>) to be closed,
+and a new <code>list_item</code> opened up as child of the <code>list</code>.  A <code>paragraph</code>
+is added as a child of the new <code>list_item</code>, to contain the text.
+We thus obtain the final tree:</p>
+<pre><code class="language-tree">-&gt; document
+  -&gt; block_quote
+       paragraph
+         &quot;Lorem ipsum dolor\nsit amet.&quot;
+    -&gt; list (type=bullet tight=true bullet_char=-)
+         list_item
+           paragraph
+             &quot;Qui *quodsi iracundia*&quot;
+      -&gt; list_item
+        -&gt; paragraph
+             &quot;aliquando id&quot;
+</code></pre>
+<h2>Phase 2: inline structure</h2>
+<p>Once all of the input has been parsed, all open blocks are closed.</p>
+<p>We then &quot;walk the tree,&quot; visiting every node, and parse raw
+string contents of paragraphs and headings as inlines.  At this
+point we have seen all the link reference definitions, so we can
+resolve reference links as we go.</p>
+<pre><code class="language-tree">document
+  block_quote
+    paragraph
+      str &quot;Lorem ipsum dolor&quot;
+      softbreak
+      str &quot;sit amet.&quot;
+    list (type=bullet tight=true bullet_char=-)
+      list_item
+        paragraph
+          str &quot;Qui &quot;
+          emph
+            str &quot;quodsi iracundia&quot;
+      list_item
+        paragraph
+          str &quot;aliquando id&quot;
+</code></pre>
+<p>Notice how the [line ending] in the first paragraph has
+been parsed as a <code>softbreak</code>, and the asterisks in the first list item
+have become an <code>emph</code>.</p>
+<h3>An algorithm for parsing nested emphasis and links</h3>
+<p>By far the trickiest part of inline parsing is handling emphasis,
+strong emphasis, links, and images.  This is done using the following
+algorithm.</p>
+<p>When we're parsing inlines and we hit either</p>
+<ul>
+<li>a run of <code>*</code> or <code>_</code> characters, or</li>
+<li>a <code>[</code> or <code>![</code></li>
+</ul>
+<p>we insert a text node with these symbols as its literal content, and we
+add a pointer to this text node to the <a href="@">delimiter stack</a>.</p>
+<p>The [delimiter stack] is a doubly linked list.  Each
+element contains a pointer to a text node, plus information about</p>
+<ul>
+<li>the type of delimiter (<code>[</code>, <code>![</code>, <code>*</code>, <code>_</code>)</li>
+<li>the number of delimiters,</li>
+<li>whether the delimiter is &quot;active&quot; (all are active to start), and</li>
+<li>whether the delimiter is a potential opener, a potential closer,
+or both (which depends on what sort of characters precede
+and follow the delimiters).</li>
+</ul>
+<p>When we hit a <code>]</code> character, we call the <em>look for link or image</em>
+procedure (see below).</p>
+<p>When we hit the end of the input, we call the <em>process emphasis</em>
+procedure (see below), with <code>stack_bottom</code> = NULL.</p>
+<h4><em>look for link or image</em></h4>
+<p>Starting at the top of the delimiter stack, we look backwards
+through the stack for an opening <code>[</code> or <code>![</code> delimiter.</p>
+<ul>
+<li>
+<p>If we don't find one, we return a literal text node <code>]</code>.</p>
+</li>
+<li>
+<p>If we do find one, but it's not <em>active</em>, we remove the inactive
+delimiter from the stack, and return a literal text node <code>]</code>.</p>
+</li>
+<li>
+<p>If we find one and it's active, then we parse ahead to see if
+we have an inline link/image, reference link/image, compact reference
+link/image, or shortcut reference link/image.</p>
+<ul>
+<li>
+<p>If we don't, then we remove the opening delimiter from the
+delimiter stack and return a literal text node <code>]</code>.</p>
+</li>
+<li>
+<p>If we do, then</p>
+<ul>
+<li>
+<p>We return a link or image node whose children are the inlines
+after the text node pointed to by the opening delimiter.</p>
+</li>
+<li>
+<p>We run <em>process emphasis</em> on these inlines, with the <code>[</code> opener
+as <code>stack_bottom</code>.</p>
+</li>
+<li>
+<p>We remove the opening delimiter.</p>
+</li>
+<li>
+<p>If we have a link (and not an image), we also set all
+<code>[</code> delimiters before the opening delimiter to <em>inactive</em>.  (This
+will prevent us from getting links within links.)</p>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+<h4><em>process emphasis</em></h4>
+<p>Parameter <code>stack_bottom</code> sets a lower bound to how far we
+descend in the [delimiter stack].  If it is NULL, we can
+go all the way to the bottom.  Otherwise, we stop before
+visiting <code>stack_bottom</code>.</p>
+<p>Let <code>current_position</code> point to the element on the [delimiter stack]
+just above <code>stack_bottom</code> (or the first element if <code>stack_bottom</code>
+is NULL).</p>
+<p>We keep track of the <code>openers_bottom</code> for each delimiter
+type (<code>*</code>, <code>_</code>), indexed to the length of the closing delimiter run
+(modulo 3) and to whether the closing delimiter can also be an
+opener.  Initialize this to <code>stack_bottom</code>.</p>
+<p>Then we repeat the following until we run out of potential
+closers:</p>
+<ul>
+<li>
+<p>Move <code>current_position</code> forward in the delimiter stack (if needed)
+until we find the first potential closer with delimiter <code>*</code> or <code>_</code>.
+(This will be the potential closer closest
+to the beginning of the input -- the first one in parse order.)</p>
+</li>
+<li>
+<p>Now, look back in the stack (staying above <code>stack_bottom</code> and
+the <code>openers_bottom</code> for this delimiter type) for the
+first matching potential opener (&quot;matching&quot; means same delimiter).</p>
+</li>
+<li>
+<p>If one is found:</p>
+<ul>
+<li>
+<p>Figure out whether we have emphasis or strong emphasis:
+if both closer and opener spans have length &gt;= 2, we have
+strong, otherwise regular.</p>
+</li>
+<li>
+<p>Insert an emph or strong emph node accordingly, after
+the text node corresponding to the opener.</p>
+</li>
+<li>
+<p>Remove any delimiters between the opener and closer from
+the delimiter stack.</p>
+</li>
+<li>
+<p>Remove 1 (for regular emph) or 2 (for strong emph) delimiters
+from the opening and closing text nodes.  If they become empty
+as a result, remove them and remove the corresponding element
+of the delimiter stack.  If the closing node is removed, reset
+<code>current_position</code> to the next element in the stack.</p>
+</li>
+</ul>
+</li>
+<li>
+<p>If none is found:</p>
+<ul>
+<li>
+<p>Set <code>openers_bottom</code> to the element before <code>current_position</code>.
+(We know that there are no openers for this kind of closer up to and
+including this point, so this puts a lower bound on future searches.)</p>
+</li>
+<li>
+<p>If the closer at <code>current_position</code> is not a potential opener,
+remove it from the delimiter stack (since we know it can't
+be a closer either).</p>
+</li>
+<li>
+<p>Advance <code>current_position</code> to the next element in the stack.</p>
+</li>
+</ul>
+</li>
+</ul>
+<p>After we're done, we remove all delimiters above <code>stack_bottom</code> from the
+delimiter stack.</p>
diff --git a/tests/test_linkify.py b/tests/test_linkify.py
new file mode 100644
index 0000000..96d506d
--- /dev/null
+++ b/tests/test_linkify.py
@@ -0,0 +1,19 @@
+from markdown_it import MarkdownIt
+
+
+def test_token_levels():
+    mdit = MarkdownIt(options_update={"linkify": True}).enable("linkify")
+    tokens = mdit.parse("www.python.org")
+    inline = tokens[1]
+    assert inline.type == "inline"
+    link_open = inline.children[0]
+    assert link_open.type == "link_open"
+    link_text = inline.children[1]
+    assert link_text.type == "text"
+    link_close = inline.children[2]
+    assert link_close.type == "link_close"
+
+    # Assert that linkify tokens have correct nesting levels
+    assert link_open.level == 0
+    assert link_text.level == 1
+    assert link_close.level == 0
diff --git a/tests/test_port/fixtures/commonmark_extras.md b/tests/test_port/fixtures/commonmark_extras.md
new file mode 100644
index 0000000..168b039
--- /dev/null
+++ b/tests/test_port/fixtures/commonmark_extras.md
@@ -0,0 +1,696 @@
+Issue commonmark/cmark#383:
+.
+*****Hello*world****
+.
+<p>**<em><strong>Hello<em>world</em></strong></em></p>
+.
+
+Issue #246.  Double escaping in ALT
+.
+![&](#)
+.
+<p><img src="#" alt="&amp;" /></p>
+.
+
+Strip markdown in ALT tags
+.
+![*strip* [markdown __in__ alt](#)](#)
+.
+<p><img src="#" alt="strip markdown in alt" /></p>
+.
+
+Issue #55:
+.
+![test]
+
+![test](foo bar)
+.
+<p>![test]</p>
+<p>![test](foo bar)</p>
+.
+
+
+Reference labels: 'i̇θωkå'.toUpperCase() is 'İΘΩKÅ', but these should still be equivalent
+.
+[İϴΩKÅ]
+
+[i̇θωkå]: /url
+.
+<p><a href="/url">İϴΩKÅ</a></p>
+.
+
+
+Reference labels: support ligatures (equivalent according to unicode case folding)
+.
+[fffifl]
+
+[fffifl]: /url
+.
+<p><a href="/url">fffifl</a></p>
+.
+
+
+Issue #35. `<` should work as punctuation
+.
+an **(:**<br />
+.
+<p>an <strong>(:</strong><br /></p>
+.
+
+
+Should unescape only needed things in link destinations/titles:
+.
+[test](<\f\o\o\>\\>)
+
+[test](foo "\\\"\b\a\r")
+.
+<p><a href="%5Cf%5Co%5Co%3E%5C">test</a></p>
+<p><a href="foo" title="\&quot;\b\a\r">test</a></p>
+.
+
+
+Not a closing tag
+.
+</ 123>
+.
+<p>&lt;/ 123&gt;</p>
+.
+
+
+
+Escaping entities in links:
+.
+[](<&quot;> "&amp;&ouml;")
+
+[](<\&quot;> "\&amp;\&ouml;")
+
+[](<\\&quot;> "\\&quot;\\&ouml;")
+.
+<p><a href="%22" title="&amp;ö"></a></p>
+<p><a href="&amp;quot;" title="&amp;amp;&amp;ouml;"></a></p>
+<p><a href="%5C%22" title="\&quot;\ö"></a></p>
+.
+
+
+Checking combination of replaceEntities and unescapeMd:
+.
+~~~ &amp;&bad;\&amp;\\&amp;
+just a funny little fence
+~~~
+.
+<pre><code class="&amp;&amp;bad;&amp;amp;\&amp;">just a funny little fence
+</code></pre>
+.
+
+Underscore between punctuation chars should be able to close emphasis.
+
+.
+_(hai)_.
+.
+<p><em>(hai)</em>.</p>
+.
+
+Regression test, should not match emphasis markers in different link tags:
+.
+[*b]() [c*]()
+.
+<p><a href="">*b</a> <a href="">c*</a></p>
+.
+
+Those are two separate blockquotes:
+.
+ - > foo
+  > bar
+.
+<ul>
+<li>
+<blockquote>
+<p>foo</p>
+</blockquote>
+</li>
+</ul>
+<blockquote>
+<p>bar</p>
+</blockquote>
+.
+
+Blockquote should terminate itself after paragraph continuation
+.
+- list
+    > blockquote
+blockquote continuation
+    - next list item
+.
+<ul>
+<li>list
+<blockquote>
+<p>blockquote
+blockquote continuation</p>
+</blockquote>
+<ul>
+<li>next list item</li>
+</ul>
+</li>
+</ul>
+.
+
+Regression test (code block + regular paragraph)
+.
+>     foo
+> bar
+.
+<blockquote>
+<pre><code>foo
+</code></pre>
+<p>bar</p>
+</blockquote>
+.
+
+Blockquotes inside indented lists should terminate correctly
+.
+   - a
+     > b
+     ```
+     c
+     ```
+   - d
+.
+<ul>
+<li>a
+<blockquote>
+<p>b</p>
+</blockquote>
+<pre><code>c
+</code></pre>
+</li>
+<li>d</li>
+</ul>
+.
+
+Don't output empty class here:
+.
+```&#x20;
+test
+```
+.
+<pre><code>test
+</code></pre>
+.
+
+Setext header text supports lazy continuations:
+.
+ - foo
+bar
+   ===
+.
+<ul>
+<li>
+<h1>foo
+bar</h1>
+</li>
+</ul>
+.
+
+But setext header underline doesn't:
+.
+ - foo
+   bar
+  ===
+.
+<ul>
+<li>foo
+bar
+===</li>
+</ul>
+.
+
+Tabs should be stripped from the beginning of the line
+.
+ foo
+ bar
+	baz
+.
+<p>foo
+bar
+baz</p>
+.
+
+Tabs should not cause hardbreak, EOL tabs aren't stripped in commonmark 0.27
+.
+foo1	
+foo2    
+bar
+.
+<p>foo1	
+foo2<br />
+bar</p>
+.
+
+List item terminating quote should not be paragraph continuation
+.
+1. foo
+   > quote
+2. bar
+.
+<ol>
+<li>foo
+<blockquote>
+<p>quote</p>
+</blockquote>
+</li>
+<li>bar</li>
+</ol>
+.
+
+Escaped space is not allowed in link destination, commonmark/CommonMark#493.
+.
+[link](a\ b)
+.
+<p>[link](a\ b)</p>
+.
+
+Link destination cannot contain '<'
+.
+[](<foo<bar>)
+
+[](<foo\<bar>)
+.
+<p>[](&lt;foo<bar>)</p>
+<p><a href="foo%3Cbar"></a></p>
+.
+
+Link title cannot contain '(' when opened with it
+.
+[](url (xxx())
+
+[](url (xxx\())
+.
+<p>[](url (xxx())</p>
+<p><a href="url" title="xxx("></a></p>
+.
+
+Allow EOL in processing instructions, commonmark/commonmark.js#196.
+.
+a <?
+?>
+.
+<p>a <?
+?></p>
+.
+
+Allow meta tag in an inline context, commonmark/commonmark-spec#527.
+.
+City:
+<span itemprop="contentLocation" itemscope itemtype="https://schema.org/City">
+  <meta itemprop="name" content="Springfield">
+</span>
+.
+<p>City:
+<span itemprop="contentLocation" itemscope itemtype="https://schema.org/City">
+<meta itemprop="name" content="Springfield">
+</span></p>
+.
+
+Coverage. Directive can terminate paragraph.
+.
+a
+<?php
+.
+<p>a</p>
+<?php
+.
+
+
+Coverage. Nested email autolink (silent mode)
+.
+*<foo@bar.com>*
+.
+<p><em><a href="mailto:foo@bar.com">foo@bar.com</a></em></p>
+.
+
+
+Coverage. Unpaired nested backtick (silent mode)
+.
+*`foo*
+.
+<p><em>`foo</em></p>
+.
+
+
+Coverage. Should continue scanning after closing "```" despite cache
+.
+```aaa``bbb``ccc```ddd``eee``
+.
+<p><code>aaa``bbb``ccc</code>ddd<code>eee</code></p>
+.
+
+
+Coverage. Entities.
+.
+*&*
+
+*&#x20;*
+
+*&amp;*
+.
+<p><em>&amp;</em></p>
+<p><em> </em></p>
+<p><em>&amp;</em></p>
+.
+
+
+Coverage. Escape.
+.
+*\a*
+.
+<p><em>\a</em></p>
+.
+
+
+Coverage. parseLinkDestination
+.
+[foo](<
+bar>)
+
+[foo](<bar)
+.
+<p>[foo](&lt;
+bar&gt;)</p>
+<p>[foo](&lt;bar)</p>
+.
+
+
+Coverage. parseLinkTitle
+.
+[foo](bar "ba)
+
+[foo](bar "ba\
+z")
+.
+<p>[foo](bar &quot;ba)</p>
+<p><a href="bar" title="ba\
+z">foo</a></p>
+.
+
+
+Coverage. Image
+.
+![test]( x )
+.
+<p><img src="x" alt="test" /></p>
+.
+.
+![test][foo]
+
+[bar]: 123
+.
+<p>![test][foo]</p>
+.
+.
+![test][[[
+
+[bar]: 123
+.
+<p>![test][[[</p>
+.
+.
+![test](
+.
+<p>![test](</p>
+.
+
+
+Coverage. Link
+.
+[test](
+.
+<p>[test](</p>
+.
+
+
+Coverage. Reference
+.
+[
+test\
+]: 123
+foo
+bar
+.
+<p>foo
+bar</p>
+.
+.
+[
+test
+]
+.
+<p>[
+test
+]</p>
+.
+.
+> [foo]: bar
+[foo]
+.
+<blockquote></blockquote>
+<p><a href="bar">foo</a></p>
+.
+
+Coverage. Tabs in blockquotes.
+.
+>		test
+
+ >		test
+
+  >		test
+
+> ---
+>		test
+
+ > ---
+ >		test
+
+  > ---
+  >		test
+
+>			test
+
+ >			test
+
+  >			test
+
+> ---
+>			test
+
+ > ---
+ >			test
+
+  > ---
+  >			test
+.
+<blockquote>
+<pre><code>  test
+</code></pre>
+</blockquote>
+<blockquote>
+<pre><code> test
+</code></pre>
+</blockquote>
+<blockquote>
+<pre><code>test
+</code></pre>
+</blockquote>
+<blockquote>
+<hr />
+<pre><code>  test
+</code></pre>
+</blockquote>
+<blockquote>
+<hr />
+<pre><code> test
+</code></pre>
+</blockquote>
+<blockquote>
+<hr />
+<pre><code>test
+</code></pre>
+</blockquote>
+<blockquote>
+<pre><code>  	test
+</code></pre>
+</blockquote>
+<blockquote>
+<pre><code> 	test
+</code></pre>
+</blockquote>
+<blockquote>
+<pre><code>	test
+</code></pre>
+</blockquote>
+<blockquote>
+<hr />
+<pre><code>  	test
+</code></pre>
+</blockquote>
+<blockquote>
+<hr />
+<pre><code> 	test
+</code></pre>
+</blockquote>
+<blockquote>
+<hr />
+<pre><code>	test
+</code></pre>
+</blockquote>
+.
+
+Coverage. Tabs in lists.
+.
+1. 	foo
+
+	     bar
+.
+<ol>
+<li>
+<p>foo</p>
+<pre><code> bar
+</code></pre>
+</li>
+</ol>
+.
+
+Coverage. Various tags not interrupting blockquotes because of indentation:
+.
+> foo
+    - - - -
+
+> foo
+    # not a heading
+.
+<blockquote>
+<p>foo
+- - - -</p>
+</blockquote>
+<blockquote>
+<p>foo
+# not a heading</p>
+</blockquote>
+.
+
+Coverage, entities with code > 10FFFF. Made this way for compatibility with commonmark.js.
+.
+&#x110000;
+
+&#x1100000;
+.
+<p>�</p>
+<p>&amp;#x1100000;</p>
+.
+
+Issue #696. Blockquotes should remember their level.
+.
+>>> foo
+bar
+>>> baz
+.
+<blockquote>
+<blockquote>
+<blockquote>
+<p>foo
+bar
+baz</p>
+</blockquote>
+</blockquote>
+</blockquote>
+.
+
+Issue #696. Blockquotes should stop when outdented from a list.
+.
+1. >>> foo
+   bar
+baz
+   >>> foo
+  >>> bar
+   >>> baz
+.
+<ol>
+<li>
+<blockquote>
+<blockquote>
+<blockquote>
+<p>foo
+bar
+baz
+foo</p>
+</blockquote>
+</blockquote>
+</blockquote>
+</li>
+</ol>
+<blockquote>
+<blockquote>
+<blockquote>
+<p>bar
+baz</p>
+</blockquote>
+</blockquote>
+</blockquote>
+.
+
+Newline in image description
+.
+There is a newline in this image ![here
+it is](https://github.com/executablebooks/)
+.
+<p>There is a newline in this image <img src="https://github.com/executablebooks/" alt="here
+it is" /></p>
+.
+
+Issue #772. Header rule should not interfere with html tags.
+.
+<!--
+==
+-->
+
+<pre>
+==
+</pre>
+.
+<!--
+==
+-->
+<pre>
+==
+</pre>
+.
+
+Issue #205.  Space in link destination generates IndexError
+.
+[Contact](http:// mail.com)
+
+[Contact](mailto: mail@mail.com)
+.
+<p>[Contact](http:// mail.com)</p>
+<p>[Contact](mailto: mail@mail.com)</p>
+.
+
+Issue #204. Combination of blockquotes, list and newlines causes an IndexError
+.
+> QUOTE
++ UNORDERED LIST ITEM
+  > INDENTED QUOTE
+
+
+
+.
+<blockquote>
+<p>QUOTE</p>
+</blockquote>
+<ul>
+<li>UNORDERED LIST ITEM
+<blockquote>
+<p>INDENTED QUOTE</p>
+</blockquote>
+</li>
+</ul>
+.
diff --git a/tests/test_port/fixtures/commonmark_spec.md b/tests/test_port/fixtures/commonmark_spec.md
new file mode 100644
index 0000000..c437019
--- /dev/null
+++ b/tests/test_port/fixtures/commonmark_spec.md
@@ -0,0 +1,7834 @@
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 355
+
+.
+	foo	baz		bim
+.
+<pre><code>foo	baz		bim
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 362
+
+.
+  	foo	baz		bim
+.
+<pre><code>foo	baz		bim
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 369
+
+.
+    a	a
+    ὐ	a
+.
+<pre><code>a	a
+ὐ	a
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 382
+
+.
+  - foo
+
+	bar
+.
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 395
+
+.
+- foo
+
+		bar
+.
+<ul>
+<li>
+<p>foo</p>
+<pre><code>  bar
+</code></pre>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 418
+
+.
+>		foo
+.
+<blockquote>
+<pre><code>  foo
+</code></pre>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 427
+
+.
+-		foo
+.
+<ul>
+<li>
+<pre><code>  foo
+</code></pre>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 439
+
+.
+    foo
+	bar
+.
+<pre><code>foo
+bar
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 448
+
+.
+ - foo
+   - bar
+	 - baz
+.
+<ul>
+<li>foo
+<ul>
+<li>bar
+<ul>
+<li>baz</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 466
+
+.
+#	Foo
+.
+<h1>Foo</h1>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 472
+
+.
+*	*	*	
+.
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 489
+
+.
+\!\"\#\$\%\&\'\(\)\*\+\,\-\.\/\:\;\<\=\>\?\@\[\\\]\^\_\`\{\|\}\~
+.
+<p>!&quot;#$%&amp;'()*+,-./:;&lt;=&gt;?@[\]^_`{|}~</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 499
+
+.
+\	\A\a\ \3\φ\«
+.
+<p>\	\A\a\ \3\φ\«</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 509
+
+.
+\*not emphasized*
+\<br/> not a tag
+\[not a link](/foo)
+\`not code`
+1\. not a list
+\* not a list
+\# not a heading
+\[foo]: /url "not a reference"
+\&ouml; not a character entity
+.
+<p>*not emphasized*
+&lt;br/&gt; not a tag
+[not a link](/foo)
+`not code`
+1. not a list
+* not a list
+# not a heading
+[foo]: /url &quot;not a reference&quot;
+&amp;ouml; not a character entity</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 534
+
+.
+\\*emphasis*
+.
+<p>\<em>emphasis</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 543
+
+.
+foo\
+bar
+.
+<p>foo<br />
+bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 555
+
+.
+`` \[\` ``
+.
+<p><code>\[\`</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 562
+
+.
+    \[\]
+.
+<pre><code>\[\]
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 570
+
+.
+~~~
+\[\]
+~~~
+.
+<pre><code>\[\]
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 580
+
+.
+<http://example.com?find=\*>
+.
+<p><a href="http://example.com?find=%5C*">http://example.com?find=\*</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 587
+
+.
+<a href="/bar\/)">
+.
+<a href="/bar\/)">
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 597
+
+.
+[foo](/bar\* "ti\*tle")
+.
+<p><a href="/bar*" title="ti*tle">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 604
+
+.
+[foo]
+
+[foo]: /bar\* "ti\*tle"
+.
+<p><a href="/bar*" title="ti*tle">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 613
+
+.
+``` foo\+bar
+foo
+```
+.
+<pre><code class="language-foo+bar">foo
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 649
+
+.
+&nbsp; &amp; &copy; &AElig; &Dcaron;
+&frac34; &HilbertSpace; &DifferentialD;
+&ClockwiseContourIntegral; &ngE;
+.
+<p>  &amp; © Æ Ď
+¾ ℋ ⅆ
+∲ ≧̸</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 668
+
+.
+&#35; &#1234; &#992; &#0;
+.
+<p># Ӓ Ϡ �</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 681
+
+.
+&#X22; &#XD06; &#xcab;
+.
+<p>&quot; ആ ಫ</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 690
+
+.
+&nbsp &x; &#; &#x;
+&#87654321;
+&#abcdef0;
+&ThisIsNotDefined; &hi?;
+.
+<p>&amp;nbsp &amp;x; &amp;#; &amp;#x;
+&amp;#87654321;
+&amp;#abcdef0;
+&amp;ThisIsNotDefined; &amp;hi?;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 707
+
+.
+&copy
+.
+<p>&amp;copy</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 717
+
+.
+&MadeUpEntity;
+.
+<p>&amp;MadeUpEntity;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 728
+
+.
+<a href="&ouml;&ouml;.html">
+.
+<a href="&ouml;&ouml;.html">
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 735
+
+.
+[foo](/f&ouml;&ouml; "f&ouml;&ouml;")
+.
+<p><a href="/f%C3%B6%C3%B6" title="föö">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 742
+
+.
+[foo]
+
+[foo]: /f&ouml;&ouml; "f&ouml;&ouml;"
+.
+<p><a href="/f%C3%B6%C3%B6" title="föö">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 751
+
+.
+``` f&ouml;&ouml;
+foo
+```
+.
+<pre><code class="language-föö">foo
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 764
+
+.
+`f&ouml;&ouml;`
+.
+<p><code>f&amp;ouml;&amp;ouml;</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 771
+
+.
+    f&ouml;f&ouml;
+.
+<pre><code>f&amp;ouml;f&amp;ouml;
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 783
+
+.
+&#42;foo&#42;
+*foo*
+.
+<p>*foo*
+<em>foo</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 791
+
+.
+&#42; foo
+
+* foo
+.
+<p>* foo</p>
+<ul>
+<li>foo</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 802
+
+.
+foo&#10;&#10;bar
+.
+<p>foo
+
+bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 810
+
+.
+&#9;foo
+.
+<p>	foo</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 817
+
+.
+[a](url &quot;tit&quot;)
+.
+<p>[a](url &quot;tit&quot;)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 840
+
+.
+- `one
+- two`
+.
+<ul>
+<li>`one</li>
+<li>two`</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 879
+
+.
+***
+---
+___
+.
+<hr />
+<hr />
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 892
+
+.
++++
+.
+<p>+++</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 899
+
+.
+===
+.
+<p>===</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 908
+
+.
+--
+**
+__
+.
+<p>--
+**
+__</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 921
+
+.
+ ***
+  ***
+   ***
+.
+<hr />
+<hr />
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 934
+
+.
+    ***
+.
+<pre><code>***
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 942
+
+.
+Foo
+    ***
+.
+<p>Foo
+***</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 953
+
+.
+_____________________________________
+.
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 962
+
+.
+ - - -
+.
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 969
+
+.
+ **  * ** * ** * **
+.
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 976
+
+.
+-     -      -      -
+.
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 985
+
+.
+- - - -    
+.
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 994
+
+.
+_ _ _ _ a
+
+a------
+
+---a---
+.
+<p>_ _ _ _ a</p>
+<p>a------</p>
+<p>---a---</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1010
+
+.
+ *-*
+.
+<p><em>-</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1019
+
+.
+- foo
+***
+- bar
+.
+<ul>
+<li>foo</li>
+</ul>
+<hr />
+<ul>
+<li>bar</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1036
+
+.
+Foo
+***
+bar
+.
+<p>Foo</p>
+<hr />
+<p>bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1053
+
+.
+Foo
+---
+bar
+.
+<h2>Foo</h2>
+<p>bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1066
+
+.
+* Foo
+* * *
+* Bar
+.
+<ul>
+<li>Foo</li>
+</ul>
+<hr />
+<ul>
+<li>Bar</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1083
+
+.
+- Foo
+- * * *
+.
+<ul>
+<li>Foo</li>
+<li>
+<hr />
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1112
+
+.
+# foo
+## foo
+### foo
+#### foo
+##### foo
+###### foo
+.
+<h1>foo</h1>
+<h2>foo</h2>
+<h3>foo</h3>
+<h4>foo</h4>
+<h5>foo</h5>
+<h6>foo</h6>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1131
+
+.
+####### foo
+.
+<p>####### foo</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1146
+
+.
+#5 bolt
+
+#hashtag
+.
+<p>#5 bolt</p>
+<p>#hashtag</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1158
+
+.
+\## foo
+.
+<p>## foo</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1167
+
+.
+# foo *bar* \*baz\*
+.
+<h1>foo <em>bar</em> *baz*</h1>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1176
+
+.
+#                  foo                     
+.
+<h1>foo</h1>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1185
+
+.
+ ### foo
+  ## foo
+   # foo
+.
+<h3>foo</h3>
+<h2>foo</h2>
+<h1>foo</h1>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1198
+
+.
+    # foo
+.
+<pre><code># foo
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1206
+
+.
+foo
+    # bar
+.
+<p>foo
+# bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1217
+
+.
+## foo ##
+  ###   bar    ###
+.
+<h2>foo</h2>
+<h3>bar</h3>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1228
+
+.
+# foo ##################################
+##### foo ##
+.
+<h1>foo</h1>
+<h5>foo</h5>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1239
+
+.
+### foo ###     
+.
+<h3>foo</h3>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1250
+
+.
+### foo ### b
+.
+<h3>foo ### b</h3>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1259
+
+.
+# foo#
+.
+<h1>foo#</h1>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1269
+
+.
+### foo \###
+## foo #\##
+# foo \#
+.
+<h3>foo ###</h3>
+<h2>foo ###</h2>
+<h1>foo #</h1>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1283
+
+.
+****
+## foo
+****
+.
+<hr />
+<h2>foo</h2>
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1294
+
+.
+Foo bar
+# baz
+Bar foo
+.
+<p>Foo bar</p>
+<h1>baz</h1>
+<p>Bar foo</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1307
+
+.
+## 
+#
+### ###
+.
+<h2></h2>
+<h1></h1>
+<h3></h3>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1350
+
+.
+Foo *bar*
+=========
+
+Foo *bar*
+---------
+.
+<h1>Foo <em>bar</em></h1>
+<h2>Foo <em>bar</em></h2>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1364
+
+.
+Foo *bar
+baz*
+====
+.
+<h1>Foo <em>bar
+baz</em></h1>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1378
+
+.
+  Foo *bar
+baz*	
+====
+.
+<h1>Foo <em>bar
+baz</em></h1>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1390
+
+.
+Foo
+-------------------------
+
+Foo
+=
+.
+<h2>Foo</h2>
+<h1>Foo</h1>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1405
+
+.
+   Foo
+---
+
+  Foo
+-----
+
+  Foo
+  ===
+.
+<h2>Foo</h2>
+<h2>Foo</h2>
+<h1>Foo</h1>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1423
+
+.
+    Foo
+    ---
+
+    Foo
+---
+.
+<pre><code>Foo
+---
+
+Foo
+</code></pre>
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1442
+
+.
+Foo
+   ----      
+.
+<h2>Foo</h2>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1452
+
+.
+Foo
+    ---
+.
+<p>Foo
+---</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1463
+
+.
+Foo
+= =
+
+Foo
+--- -
+.
+<p>Foo
+= =</p>
+<p>Foo</p>
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1479
+
+.
+Foo  
+-----
+.
+<h2>Foo</h2>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1489
+
+.
+Foo\
+----
+.
+<h2>Foo\</h2>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1500
+
+.
+`Foo
+----
+`
+
+<a title="a lot
+---
+of dashes"/>
+.
+<h2>`Foo</h2>
+<p>`</p>
+<h2>&lt;a title=&quot;a lot</h2>
+<p>of dashes&quot;/&gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1519
+
+.
+> Foo
+---
+.
+<blockquote>
+<p>Foo</p>
+</blockquote>
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1530
+
+.
+> foo
+bar
+===
+.
+<blockquote>
+<p>foo
+bar
+===</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1543
+
+.
+- Foo
+---
+.
+<ul>
+<li>Foo</li>
+</ul>
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1558
+
+.
+Foo
+Bar
+---
+.
+<h2>Foo
+Bar</h2>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1571
+
+.
+---
+Foo
+---
+Bar
+---
+Baz
+.
+<hr />
+<h2>Foo</h2>
+<h2>Bar</h2>
+<p>Baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1588
+
+.
+
+====
+.
+<p>====</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1600
+
+.
+---
+---
+.
+<hr />
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1609
+
+.
+- foo
+-----
+.
+<ul>
+<li>foo</li>
+</ul>
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1620
+
+.
+    foo
+---
+.
+<pre><code>foo
+</code></pre>
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1630
+
+.
+> foo
+-----
+.
+<blockquote>
+<p>foo</p>
+</blockquote>
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1644
+
+.
+\> foo
+------
+.
+<h2>&gt; foo</h2>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1675
+
+.
+Foo
+
+bar
+---
+baz
+.
+<p>Foo</p>
+<h2>bar</h2>
+<p>baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1691
+
+.
+Foo
+bar
+
+---
+
+baz
+.
+<p>Foo
+bar</p>
+<hr />
+<p>baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1709
+
+.
+Foo
+bar
+* * *
+baz
+.
+<p>Foo
+bar</p>
+<hr />
+<p>baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1724
+
+.
+Foo
+bar
+\---
+baz
+.
+<p>Foo
+bar
+---
+baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1752
+
+.
+    a simple
+      indented code block
+.
+<pre><code>a simple
+  indented code block
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1766
+
+.
+  - foo
+
+    bar
+.
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1780
+
+.
+1.  foo
+
+    - bar
+.
+<ol>
+<li>
+<p>foo</p>
+<ul>
+<li>bar</li>
+</ul>
+</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1800
+
+.
+    <a/>
+    *hi*
+
+    - one
+.
+<pre><code>&lt;a/&gt;
+*hi*
+
+- one
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1816
+
+.
+    chunk1
+
+    chunk2
+  
+ 
+ 
+    chunk3
+.
+<pre><code>chunk1
+
+chunk2
+
+
+
+chunk3
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1839
+
+.
+    chunk1
+      
+      chunk2
+.
+<pre><code>chunk1
+  
+  chunk2
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1854
+
+.
+Foo
+    bar
+
+.
+<p>Foo
+bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1868
+
+.
+    foo
+bar
+.
+<pre><code>foo
+</code></pre>
+<p>bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1881
+
+.
+# Heading
+    foo
+Heading
+------
+    foo
+----
+.
+<h1>Heading</h1>
+<pre><code>foo
+</code></pre>
+<h2>Heading</h2>
+<pre><code>foo
+</code></pre>
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1901
+
+.
+        foo
+    bar
+.
+<pre><code>    foo
+bar
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1914
+
+.
+
+    
+    foo
+    
+
+.
+<pre><code>foo
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1928
+
+.
+    foo  
+.
+<pre><code>foo  
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1983
+
+.
+```
+<
+ >
+```
+.
+<pre><code>&lt;
+ &gt;
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 1997
+
+.
+~~~
+<
+ >
+~~~
+.
+<pre><code>&lt;
+ &gt;
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2010
+
+.
+``
+foo
+``
+.
+<p><code>foo</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2021
+
+.
+```
+aaa
+~~~
+```
+.
+<pre><code>aaa
+~~~
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2033
+
+.
+~~~
+aaa
+```
+~~~
+.
+<pre><code>aaa
+```
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2047
+
+.
+````
+aaa
+```
+``````
+.
+<pre><code>aaa
+```
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2059
+
+.
+~~~~
+aaa
+~~~
+~~~~
+.
+<pre><code>aaa
+~~~
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2074
+
+.
+```
+.
+<pre><code></code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2081
+
+.
+`````
+
+```
+aaa
+.
+<pre><code>
+```
+aaa
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2094
+
+.
+> ```
+> aaa
+
+bbb
+.
+<blockquote>
+<pre><code>aaa
+</code></pre>
+</blockquote>
+<p>bbb</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2110
+
+.
+```
+
+  
+```
+.
+<pre><code>
+  
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2124
+
+.
+```
+```
+.
+<pre><code></code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2136
+
+.
+ ```
+ aaa
+aaa
+```
+.
+<pre><code>aaa
+aaa
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2148
+
+.
+  ```
+aaa
+  aaa
+aaa
+  ```
+.
+<pre><code>aaa
+aaa
+aaa
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2162
+
+.
+   ```
+   aaa
+    aaa
+  aaa
+   ```
+.
+<pre><code>aaa
+ aaa
+aaa
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2178
+
+.
+    ```
+    aaa
+    ```
+.
+<pre><code>```
+aaa
+```
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2193
+
+.
+```
+aaa
+  ```
+.
+<pre><code>aaa
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2203
+
+.
+   ```
+aaa
+  ```
+.
+<pre><code>aaa
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2215
+
+.
+```
+aaa
+    ```
+.
+<pre><code>aaa
+    ```
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2229
+
+.
+``` ```
+aaa
+.
+<p><code> </code>
+aaa</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2238
+
+.
+~~~~~~
+aaa
+~~~ ~~
+.
+<pre><code>aaa
+~~~ ~~
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2252
+
+.
+foo
+```
+bar
+```
+baz
+.
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+<p>baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2269
+
+.
+foo
+---
+~~~
+bar
+~~~
+# baz
+.
+<h2>foo</h2>
+<pre><code>bar
+</code></pre>
+<h1>baz</h1>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2291
+
+.
+```ruby
+def foo(x)
+  return 3
+end
+```
+.
+<pre><code class="language-ruby">def foo(x)
+  return 3
+end
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2305
+
+.
+~~~~    ruby startline=3 $%@#$
+def foo(x)
+  return 3
+end
+~~~~~~~
+.
+<pre><code class="language-ruby">def foo(x)
+  return 3
+end
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2319
+
+.
+````;
+````
+.
+<pre><code class="language-;"></code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2329
+
+.
+``` aa ```
+foo
+.
+<p><code>aa</code>
+foo</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2340
+
+.
+~~~ aa ``` ~~~
+foo
+~~~
+.
+<pre><code class="language-aa">foo
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2352
+
+.
+```
+``` aaa
+```
+.
+<pre><code>``` aaa
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2431
+
+.
+<table><tr><td>
+<pre>
+**Hello**,
+
+_world_.
+</pre>
+</td></tr></table>
+.
+<table><tr><td>
+<pre>
+**Hello**,
+<p><em>world</em>.
+</pre></p>
+</td></tr></table>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2460
+
+.
+<table>
+  <tr>
+    <td>
+           hi
+    </td>
+  </tr>
+</table>
+
+okay.
+.
+<table>
+  <tr>
+    <td>
+           hi
+    </td>
+  </tr>
+</table>
+<p>okay.</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2482
+
+.
+ <div>
+  *hello*
+         <foo><a>
+.
+ <div>
+  *hello*
+         <foo><a>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2495
+
+.
+</div>
+*foo*
+.
+</div>
+*foo*
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2506
+
+.
+<DIV CLASS="foo">
+
+*Markdown*
+
+</DIV>
+.
+<DIV CLASS="foo">
+<p><em>Markdown</em></p>
+</DIV>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2522
+
+.
+<div id="foo"
+  class="bar">
+</div>
+.
+<div id="foo"
+  class="bar">
+</div>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2533
+
+.
+<div id="foo" class="bar
+  baz">
+</div>
+.
+<div id="foo" class="bar
+  baz">
+</div>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2545
+
+.
+<div>
+*foo*
+
+*bar*
+.
+<div>
+*foo*
+<p><em>bar</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2561
+
+.
+<div id="foo"
+*hi*
+.
+<div id="foo"
+*hi*
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2570
+
+.
+<div class
+foo
+.
+<div class
+foo
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2582
+
+.
+<div *???-&&&-<---
+*foo*
+.
+<div *???-&&&-<---
+*foo*
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2594
+
+.
+<div><a href="bar">*foo*</a></div>
+.
+<div><a href="bar">*foo*</a></div>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2601
+
+.
+<table><tr><td>
+foo
+</td></tr></table>
+.
+<table><tr><td>
+foo
+</td></tr></table>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2618
+
+.
+<div></div>
+``` c
+int x = 33;
+```
+.
+<div></div>
+``` c
+int x = 33;
+```
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2635
+
+.
+<a href="foo">
+*bar*
+</a>
+.
+<a href="foo">
+*bar*
+</a>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2648
+
+.
+<Warning>
+*bar*
+</Warning>
+.
+<Warning>
+*bar*
+</Warning>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2659
+
+.
+<i class="foo">
+*bar*
+</i>
+.
+<i class="foo">
+*bar*
+</i>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2670
+
+.
+</ins>
+*bar*
+.
+</ins>
+*bar*
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2685
+
+.
+<del>
+*foo*
+</del>
+.
+<del>
+*foo*
+</del>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2700
+
+.
+<del>
+
+*foo*
+
+</del>
+.
+<del>
+<p><em>foo</em></p>
+</del>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2718
+
+.
+<del>*foo*</del>
+.
+<p><del><em>foo</em></del></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2734
+
+.
+<pre language="haskell"><code>
+import Text.HTML.TagSoup
+
+main :: IO ()
+main = print $ parseTags tags
+</code></pre>
+okay
+.
+<pre language="haskell"><code>
+import Text.HTML.TagSoup
+
+main :: IO ()
+main = print $ parseTags tags
+</code></pre>
+<p>okay</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2755
+
+.
+<script type="text/javascript">
+// JavaScript example
+
+document.getElementById("demo").innerHTML = "Hello JavaScript!";
+</script>
+okay
+.
+<script type="text/javascript">
+// JavaScript example
+
+document.getElementById("demo").innerHTML = "Hello JavaScript!";
+</script>
+<p>okay</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2774
+
+.
+<textarea>
+
+*foo*
+
+_bar_
+
+</textarea>
+.
+<textarea>
+
+*foo*
+
+_bar_
+
+</textarea>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2794
+
+.
+<style
+  type="text/css">
+h1 {color:red;}
+
+p {color:blue;}
+</style>
+okay
+.
+<style
+  type="text/css">
+h1 {color:red;}
+
+p {color:blue;}
+</style>
+<p>okay</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2817
+
+.
+<style
+  type="text/css">
+
+foo
+.
+<style
+  type="text/css">
+
+foo
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2830
+
+.
+> <div>
+> foo
+
+bar
+.
+<blockquote>
+<div>
+foo
+</blockquote>
+<p>bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2844
+
+.
+- <div>
+- foo
+.
+<ul>
+<li>
+<div>
+</li>
+<li>foo</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2859
+
+.
+<style>p{color:red;}</style>
+*foo*
+.
+<style>p{color:red;}</style>
+<p><em>foo</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2868
+
+.
+<!-- foo -->*bar*
+*baz*
+.
+<!-- foo -->*bar*
+<p><em>baz</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2880
+
+.
+<script>
+foo
+</script>1. *bar*
+.
+<script>
+foo
+</script>1. *bar*
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2893
+
+.
+<!-- Foo
+
+bar
+   baz -->
+okay
+.
+<!-- Foo
+
+bar
+   baz -->
+<p>okay</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2911
+
+.
+<?php
+
+  echo '>';
+
+?>
+okay
+.
+<?php
+
+  echo '>';
+
+?>
+<p>okay</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2930
+
+.
+<!DOCTYPE html>
+.
+<!DOCTYPE html>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2939
+
+.
+<![CDATA[
+function matchwo(a,b)
+{
+  if (a < b && a < 0) then {
+    return 1;
+
+  } else {
+
+    return 0;
+  }
+}
+]]>
+okay
+.
+<![CDATA[
+function matchwo(a,b)
+{
+  if (a < b && a < 0) then {
+    return 1;
+
+  } else {
+
+    return 0;
+  }
+}
+]]>
+<p>okay</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2973
+
+.
+  <!-- foo -->
+
+    <!-- foo -->
+.
+  <!-- foo -->
+<pre><code>&lt;!-- foo --&gt;
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2984
+
+.
+  <div>
+
+    <div>
+.
+  <div>
+<pre><code>&lt;div&gt;
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 2998
+
+.
+Foo
+<div>
+bar
+</div>
+.
+<p>Foo</p>
+<div>
+bar
+</div>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3015
+
+.
+<div>
+bar
+</div>
+*foo*
+.
+<div>
+bar
+</div>
+*foo*
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3030
+
+.
+Foo
+<a href="bar">
+baz
+.
+<p>Foo
+<a href="bar">
+baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3071
+
+.
+<div>
+
+*Emphasized* text.
+
+</div>
+.
+<div>
+<p><em>Emphasized</em> text.</p>
+</div>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3084
+
+.
+<div>
+*Emphasized* text.
+</div>
+.
+<div>
+*Emphasized* text.
+</div>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3106
+
+.
+<table>
+
+<tr>
+
+<td>
+Hi
+</td>
+
+</tr>
+
+</table>
+.
+<table>
+<tr>
+<td>
+Hi
+</td>
+</tr>
+</table>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3133
+
+.
+<table>
+
+  <tr>
+
+    <td>
+      Hi
+    </td>
+
+  </tr>
+
+</table>
+.
+<table>
+  <tr>
+<pre><code>&lt;td&gt;
+  Hi
+&lt;/td&gt;
+</code></pre>
+  </tr>
+</table>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3182
+
+.
+[foo]: /url "title"
+
+[foo]
+.
+<p><a href="/url" title="title">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3191
+
+.
+   [foo]: 
+      /url  
+           'the title'  
+
+[foo]
+.
+<p><a href="/url" title="the title">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3202
+
+.
+[Foo*bar\]]:my_(url) 'title (with parens)'
+
+[Foo*bar\]]
+.
+<p><a href="my_(url)" title="title (with parens)">Foo*bar]</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3211
+
+.
+[Foo bar]:
+<my url>
+'title'
+
+[Foo bar]
+.
+<p><a href="my%20url" title="title">Foo bar</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3224
+
+.
+[foo]: /url '
+title
+line1
+line2
+'
+
+[foo]
+.
+<p><a href="/url" title="
+title
+line1
+line2
+">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3243
+
+.
+[foo]: /url 'title
+
+with blank line'
+
+[foo]
+.
+<p>[foo]: /url 'title</p>
+<p>with blank line'</p>
+<p>[foo]</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3258
+
+.
+[foo]:
+/url
+
+[foo]
+.
+<p><a href="/url">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3270
+
+.
+[foo]:
+
+[foo]
+.
+<p>[foo]:</p>
+<p>[foo]</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3282
+
+.
+[foo]: <>
+
+[foo]
+.
+<p><a href="">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3293
+
+.
+[foo]: <bar>(baz)
+
+[foo]
+.
+<p>[foo]: <bar>(baz)</p>
+<p>[foo]</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3306
+
+.
+[foo]: /url\bar\*baz "foo\"bar\baz"
+
+[foo]
+.
+<p><a href="/url%5Cbar*baz" title="foo&quot;bar\baz">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3317
+
+.
+[foo]
+
+[foo]: url
+.
+<p><a href="url">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3329
+
+.
+[foo]
+
+[foo]: first
+[foo]: second
+.
+<p><a href="first">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3342
+
+.
+[FOO]: /url
+
+[Foo]
+.
+<p><a href="/url">Foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3351
+
+.
+[ΑΓΩ]: /φου
+
+[αγω]
+.
+<p><a href="/%CF%86%CE%BF%CF%85">αγω</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3366
+
+.
+[foo]: /url
+.
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3374
+
+.
+[
+foo
+]: /url
+bar
+.
+<p>bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3387
+
+.
+[foo]: /url "title" ok
+.
+<p>[foo]: /url &quot;title&quot; ok</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3396
+
+.
+[foo]: /url
+"title" ok
+.
+<p>&quot;title&quot; ok</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3407
+
+.
+    [foo]: /url "title"
+
+[foo]
+.
+<pre><code>[foo]: /url &quot;title&quot;
+</code></pre>
+<p>[foo]</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3421
+
+.
+```
+[foo]: /url
+```
+
+[foo]
+.
+<pre><code>[foo]: /url
+</code></pre>
+<p>[foo]</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3436
+
+.
+Foo
+[bar]: /baz
+
+[bar]
+.
+<p>Foo
+[bar]: /baz</p>
+<p>[bar]</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3451
+
+.
+# [Foo]
+[foo]: /url
+> bar
+.
+<h1><a href="/url">Foo</a></h1>
+<blockquote>
+<p>bar</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3462
+
+.
+[foo]: /url
+bar
+===
+[foo]
+.
+<h1>bar</h1>
+<p><a href="/url">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3472
+
+.
+[foo]: /url
+===
+[foo]
+.
+<p>===
+<a href="/url">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3485
+
+.
+[foo]: /foo-url "foo"
+[bar]: /bar-url
+  "bar"
+[baz]: /baz-url
+
+[foo],
+[bar],
+[baz]
+.
+<p><a href="/foo-url" title="foo">foo</a>,
+<a href="/bar-url" title="bar">bar</a>,
+<a href="/baz-url">baz</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3506
+
+.
+[foo]
+
+> [foo]: /url
+.
+<p><a href="/url">foo</a></p>
+<blockquote>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3528
+
+.
+aaa
+
+bbb
+.
+<p>aaa</p>
+<p>bbb</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3540
+
+.
+aaa
+bbb
+
+ccc
+ddd
+.
+<p>aaa
+bbb</p>
+<p>ccc
+ddd</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3556
+
+.
+aaa
+
+
+bbb
+.
+<p>aaa</p>
+<p>bbb</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3569
+
+.
+  aaa
+ bbb
+.
+<p>aaa
+bbb</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3581
+
+.
+aaa
+             bbb
+                                       ccc
+.
+<p>aaa
+bbb
+ccc</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3595
+
+.
+   aaa
+bbb
+.
+<p>aaa
+bbb</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3604
+
+.
+    aaa
+bbb
+.
+<pre><code>aaa
+</code></pre>
+<p>bbb</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3618
+
+.
+aaa     
+bbb     
+.
+<p>aaa<br />
+bbb</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3635
+
+.
+  
+
+aaa
+  
+
+# aaa
+
+  
+.
+<p>aaa</p>
+<h1>aaa</h1>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3703
+
+.
+> # Foo
+> bar
+> baz
+.
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3718
+
+.
+># Foo
+>bar
+> baz
+.
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3733
+
+.
+   > # Foo
+   > bar
+ > baz
+.
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3748
+
+.
+    > # Foo
+    > bar
+    > baz
+.
+<pre><code>&gt; # Foo
+&gt; bar
+&gt; baz
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3763
+
+.
+> # Foo
+> bar
+baz
+.
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3779
+
+.
+> bar
+baz
+> foo
+.
+<blockquote>
+<p>bar
+baz
+foo</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3803
+
+.
+> foo
+---
+.
+<blockquote>
+<p>foo</p>
+</blockquote>
+<hr />
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3823
+
+.
+> - foo
+- bar
+.
+<blockquote>
+<ul>
+<li>foo</li>
+</ul>
+</blockquote>
+<ul>
+<li>bar</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3841
+
+.
+>     foo
+    bar
+.
+<blockquote>
+<pre><code>foo
+</code></pre>
+</blockquote>
+<pre><code>bar
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3854
+
+.
+> ```
+foo
+```
+.
+<blockquote>
+<pre><code></code></pre>
+</blockquote>
+<p>foo</p>
+<pre><code></code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3870
+
+.
+> foo
+    - bar
+.
+<blockquote>
+<p>foo
+- bar</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3894
+
+.
+>
+.
+<blockquote>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3902
+
+.
+>
+>  
+> 
+.
+<blockquote>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3914
+
+.
+>
+> foo
+>  
+.
+<blockquote>
+<p>foo</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3927
+
+.
+> foo
+
+> bar
+.
+<blockquote>
+<p>foo</p>
+</blockquote>
+<blockquote>
+<p>bar</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3949
+
+.
+> foo
+> bar
+.
+<blockquote>
+<p>foo
+bar</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3962
+
+.
+> foo
+>
+> bar
+.
+<blockquote>
+<p>foo</p>
+<p>bar</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3976
+
+.
+foo
+> bar
+.
+<p>foo</p>
+<blockquote>
+<p>bar</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 3990
+
+.
+> aaa
+***
+> bbb
+.
+<blockquote>
+<p>aaa</p>
+</blockquote>
+<hr />
+<blockquote>
+<p>bbb</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4008
+
+.
+> bar
+baz
+.
+<blockquote>
+<p>bar
+baz</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4019
+
+.
+> bar
+
+baz
+.
+<blockquote>
+<p>bar</p>
+</blockquote>
+<p>baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4031
+
+.
+> bar
+>
+baz
+.
+<blockquote>
+<p>bar</p>
+</blockquote>
+<p>baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4047
+
+.
+> > > foo
+bar
+.
+<blockquote>
+<blockquote>
+<blockquote>
+<p>foo
+bar</p>
+</blockquote>
+</blockquote>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4062
+
+.
+>>> foo
+> bar
+>>baz
+.
+<blockquote>
+<blockquote>
+<blockquote>
+<p>foo
+bar
+baz</p>
+</blockquote>
+</blockquote>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4084
+
+.
+>     code
+
+>    not code
+.
+<blockquote>
+<pre><code>code
+</code></pre>
+</blockquote>
+<blockquote>
+<p>not code</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4138
+
+.
+A paragraph
+with two lines.
+
+    indented code
+
+> A block quote.
+.
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4160
+
+.
+1.  A paragraph
+    with two lines.
+
+        indented code
+
+    > A block quote.
+.
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4193
+
+.
+- one
+
+ two
+.
+<ul>
+<li>one</li>
+</ul>
+<p>two</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4205
+
+.
+- one
+
+  two
+.
+<ul>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4219
+
+.
+ -    one
+
+     two
+.
+<ul>
+<li>one</li>
+</ul>
+<pre><code> two
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4232
+
+.
+ -    one
+
+      two
+.
+<ul>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4254
+
+.
+   > > 1.  one
+>>
+>>     two
+.
+<blockquote>
+<blockquote>
+<ol>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ol>
+</blockquote>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4281
+
+.
+>>- one
+>>
+  >  > two
+.
+<blockquote>
+<blockquote>
+<ul>
+<li>one</li>
+</ul>
+<p>two</p>
+</blockquote>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4300
+
+.
+-one
+
+2.two
+.
+<p>-one</p>
+<p>2.two</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4313
+
+.
+- foo
+
+
+  bar
+.
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4330
+
+.
+1.  foo
+
+    ```
+    bar
+    ```
+
+    baz
+
+    > bam
+.
+<ol>
+<li>
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+<p>baz</p>
+<blockquote>
+<p>bam</p>
+</blockquote>
+</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4358
+
+.
+- Foo
+
+      bar
+
+
+      baz
+.
+<ul>
+<li>
+<p>Foo</p>
+<pre><code>bar
+
+
+baz
+</code></pre>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4380
+
+.
+123456789. ok
+.
+<ol start="123456789">
+<li>ok</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4389
+
+.
+1234567890. not ok
+.
+<p>1234567890. not ok</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4398
+
+.
+0. ok
+.
+<ol start="0">
+<li>ok</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4407
+
+.
+003. ok
+.
+<ol start="3">
+<li>ok</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4418
+
+.
+-1. not ok
+.
+<p>-1. not ok</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4441
+
+.
+- foo
+
+      bar
+.
+<ul>
+<li>
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4458
+
+.
+  10.  foo
+
+           bar
+.
+<ol start="10">
+<li>
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4477
+
+.
+    indented code
+
+paragraph
+
+    more code
+.
+<pre><code>indented code
+</code></pre>
+<p>paragraph</p>
+<pre><code>more code
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4492
+
+.
+1.     indented code
+
+   paragraph
+
+       more code
+.
+<ol>
+<li>
+<pre><code>indented code
+</code></pre>
+<p>paragraph</p>
+<pre><code>more code
+</code></pre>
+</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4514
+
+.
+1.      indented code
+
+   paragraph
+
+       more code
+.
+<ol>
+<li>
+<pre><code> indented code
+</code></pre>
+<p>paragraph</p>
+<pre><code>more code
+</code></pre>
+</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4541
+
+.
+   foo
+
+bar
+.
+<p>foo</p>
+<p>bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4551
+
+.
+-    foo
+
+  bar
+.
+<ul>
+<li>foo</li>
+</ul>
+<p>bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4568
+
+.
+-  foo
+
+   bar
+.
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4595
+
+.
+-
+  foo
+-
+  ```
+  bar
+  ```
+-
+      baz
+.
+<ul>
+<li>foo</li>
+<li>
+<pre><code>bar
+</code></pre>
+</li>
+<li>
+<pre><code>baz
+</code></pre>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4621
+
+.
+-   
+  foo
+.
+<ul>
+<li>foo</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4635
+
+.
+-
+
+  foo
+.
+<ul>
+<li></li>
+</ul>
+<p>foo</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4649
+
+.
+- foo
+-
+- bar
+.
+<ul>
+<li>foo</li>
+<li></li>
+<li>bar</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4664
+
+.
+- foo
+-   
+- bar
+.
+<ul>
+<li>foo</li>
+<li></li>
+<li>bar</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4679
+
+.
+1. foo
+2.
+3. bar
+.
+<ol>
+<li>foo</li>
+<li></li>
+<li>bar</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4694
+
+.
+*
+.
+<ul>
+<li></li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4704
+
+.
+foo
+*
+
+foo
+1.
+.
+<p>foo
+*</p>
+<p>foo
+1.</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4726
+
+.
+ 1.  A paragraph
+     with two lines.
+
+         indented code
+
+     > A block quote.
+.
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4750
+
+.
+  1.  A paragraph
+      with two lines.
+
+          indented code
+
+      > A block quote.
+.
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4774
+
+.
+   1.  A paragraph
+       with two lines.
+
+           indented code
+
+       > A block quote.
+.
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4798
+
+.
+    1.  A paragraph
+        with two lines.
+
+            indented code
+
+        > A block quote.
+.
+<pre><code>1.  A paragraph
+    with two lines.
+
+        indented code
+
+    &gt; A block quote.
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4828
+
+.
+  1.  A paragraph
+with two lines.
+
+          indented code
+
+      > A block quote.
+.
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4852
+
+.
+  1.  A paragraph
+    with two lines.
+.
+<ol>
+<li>A paragraph
+with two lines.</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4865
+
+.
+> 1. > Blockquote
+continued here.
+.
+<blockquote>
+<ol>
+<li>
+<blockquote>
+<p>Blockquote
+continued here.</p>
+</blockquote>
+</li>
+</ol>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4882
+
+.
+> 1. > Blockquote
+> continued here.
+.
+<blockquote>
+<ol>
+<li>
+<blockquote>
+<p>Blockquote
+continued here.</p>
+</blockquote>
+</li>
+</ol>
+</blockquote>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4910
+
+.
+- foo
+  - bar
+    - baz
+      - boo
+.
+<ul>
+<li>foo
+<ul>
+<li>bar
+<ul>
+<li>baz
+<ul>
+<li>boo</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4936
+
+.
+- foo
+ - bar
+  - baz
+   - boo
+.
+<ul>
+<li>foo</li>
+<li>bar</li>
+<li>baz</li>
+<li>boo</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4953
+
+.
+10) foo
+    - bar
+.
+<ol start="10">
+<li>foo
+<ul>
+<li>bar</li>
+</ul>
+</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4969
+
+.
+10) foo
+   - bar
+.
+<ol start="10">
+<li>foo</li>
+</ol>
+<ul>
+<li>bar</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4984
+
+.
+- - foo
+.
+<ul>
+<li>
+<ul>
+<li>foo</li>
+</ul>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4997
+
+.
+1. - 2. foo
+.
+<ol>
+<li>
+<ul>
+<li>
+<ol start="2">
+<li>foo</li>
+</ol>
+</li>
+</ul>
+</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5016
+
+.
+- # Foo
+- Bar
+  ---
+  baz
+.
+<ul>
+<li>
+<h1>Foo</h1>
+</li>
+<li>
+<h2>Bar</h2>
+baz</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5252
+
+.
+- foo
+- bar
++ baz
+.
+<ul>
+<li>foo</li>
+<li>bar</li>
+</ul>
+<ul>
+<li>baz</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5267
+
+.
+1. foo
+2. bar
+3) baz
+.
+<ol>
+<li>foo</li>
+<li>bar</li>
+</ol>
+<ol start="3">
+<li>baz</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5286
+
+.
+Foo
+- bar
+- baz
+.
+<p>Foo</p>
+<ul>
+<li>bar</li>
+<li>baz</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5363
+
+.
+The number of windows in my house is
+14.  The number of doors is 6.
+.
+<p>The number of windows in my house is
+14.  The number of doors is 6.</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5373
+
+.
+The number of windows in my house is
+1.  The number of doors is 6.
+.
+<p>The number of windows in my house is</p>
+<ol>
+<li>The number of doors is 6.</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5387
+
+.
+- foo
+
+- bar
+
+
+- baz
+.
+<ul>
+<li>
+<p>foo</p>
+</li>
+<li>
+<p>bar</p>
+</li>
+<li>
+<p>baz</p>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5408
+
+.
+- foo
+  - bar
+    - baz
+
+
+      bim
+.
+<ul>
+<li>foo
+<ul>
+<li>bar
+<ul>
+<li>
+<p>baz</p>
+<p>bim</p>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5438
+
+.
+- foo
+- bar
+
+<!-- -->
+
+- baz
+- bim
+.
+<ul>
+<li>foo</li>
+<li>bar</li>
+</ul>
+<!-- -->
+<ul>
+<li>baz</li>
+<li>bim</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5459
+
+.
+-   foo
+
+    notcode
+
+-   foo
+
+<!-- -->
+
+    code
+.
+<ul>
+<li>
+<p>foo</p>
+<p>notcode</p>
+</li>
+<li>
+<p>foo</p>
+</li>
+</ul>
+<!-- -->
+<pre><code>code
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5490
+
+.
+- a
+ - b
+  - c
+   - d
+  - e
+ - f
+- g
+.
+<ul>
+<li>a</li>
+<li>b</li>
+<li>c</li>
+<li>d</li>
+<li>e</li>
+<li>f</li>
+<li>g</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5511
+
+.
+1. a
+
+  2. b
+
+   3. c
+.
+<ol>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+<li>
+<p>c</p>
+</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5535
+
+.
+- a
+ - b
+  - c
+   - d
+    - e
+.
+<ul>
+<li>a</li>
+<li>b</li>
+<li>c</li>
+<li>d
+- e</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5555
+
+.
+1. a
+
+  2. b
+
+    3. c
+.
+<ol>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+</ol>
+<pre><code>3. c
+</code></pre>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5578
+
+.
+- a
+- b
+
+- c
+.
+<ul>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+<li>
+<p>c</p>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5600
+
+.
+* a
+*
+
+* c
+.
+<ul>
+<li>
+<p>a</p>
+</li>
+<li></li>
+<li>
+<p>c</p>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5622
+
+.
+- a
+- b
+
+  c
+- d
+.
+<ul>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+<p>c</p>
+</li>
+<li>
+<p>d</p>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5644
+
+.
+- a
+- b
+
+  [ref]: /url
+- d
+.
+<ul>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+<li>
+<p>d</p>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5667
+
+.
+- a
+- ```
+  b
+
+
+  ```
+- c
+.
+<ul>
+<li>a</li>
+<li>
+<pre><code>b
+
+
+</code></pre>
+</li>
+<li>c</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5693
+
+.
+- a
+  - b
+
+    c
+- d
+.
+<ul>
+<li>a
+<ul>
+<li>
+<p>b</p>
+<p>c</p>
+</li>
+</ul>
+</li>
+<li>d</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5717
+
+.
+* a
+  > b
+  >
+* c
+.
+<ul>
+<li>a
+<blockquote>
+<p>b</p>
+</blockquote>
+</li>
+<li>c</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5737
+
+.
+- a
+  > b
+  ```
+  c
+  ```
+- d
+.
+<ul>
+<li>a
+<blockquote>
+<p>b</p>
+</blockquote>
+<pre><code>c
+</code></pre>
+</li>
+<li>d</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5760
+
+.
+- a
+.
+<ul>
+<li>a</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5769
+
+.
+- a
+  - b
+.
+<ul>
+<li>a
+<ul>
+<li>b</li>
+</ul>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5786
+
+.
+1. ```
+   foo
+   ```
+
+   bar
+.
+<ol>
+<li>
+<pre><code>foo
+</code></pre>
+<p>bar</p>
+</li>
+</ol>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5805
+
+.
+* foo
+  * bar
+
+  baz
+.
+<ul>
+<li>
+<p>foo</p>
+<ul>
+<li>bar</li>
+</ul>
+<p>baz</p>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5823
+
+.
+- a
+  - b
+  - c
+
+- d
+  - e
+  - f
+.
+<ul>
+<li>
+<p>a</p>
+<ul>
+<li>b</li>
+<li>c</li>
+</ul>
+</li>
+<li>
+<p>d</p>
+<ul>
+<li>e</li>
+<li>f</li>
+</ul>
+</li>
+</ul>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5857
+
+.
+`hi`lo`
+.
+<p><code>hi</code>lo`</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5889
+
+.
+`foo`
+.
+<p><code>foo</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5900
+
+.
+`` foo ` bar ``
+.
+<p><code>foo ` bar</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5910
+
+.
+` `` `
+.
+<p><code>``</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5918
+
+.
+`  ``  `
+.
+<p><code> `` </code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5927
+
+.
+` a`
+.
+<p><code> a</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5936
+
+.
+` b `
+.
+<p><code> b </code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5944
+
+.
+` `
+`  `
+.
+<p><code> </code>
+<code>  </code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5955
+
+.
+``
+foo
+bar  
+baz
+``
+.
+<p><code>foo bar   baz</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5965
+
+.
+``
+foo 
+``
+.
+<p><code>foo </code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5976
+
+.
+`foo   bar 
+baz`
+.
+<p><code>foo   bar  baz</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 5993
+
+.
+`foo\`bar`
+.
+<p><code>foo\</code>bar`</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6004
+
+.
+``foo`bar``
+.
+<p><code>foo`bar</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6010
+
+.
+` foo `` bar `
+.
+<p><code>foo `` bar</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6022
+
+.
+*foo`*`
+.
+<p>*foo<code>*</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6031
+
+.
+[not a `link](/foo`)
+.
+<p>[not a <code>link](/foo</code>)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6041
+
+.
+`<a href="`">`
+.
+<p><code>&lt;a href=&quot;</code>&quot;&gt;`</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6050
+
+.
+<a href="`">`
+.
+<p><a href="`">`</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6059
+
+.
+`<http://foo.bar.`baz>`
+.
+<p><code>&lt;http://foo.bar.</code>baz&gt;`</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6068
+
+.
+<http://foo.bar.`baz>`
+.
+<p><a href="http://foo.bar.%60baz">http://foo.bar.`baz</a>`</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6078
+
+.
+```foo``
+.
+<p>```foo``</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6085
+
+.
+`foo
+.
+<p>`foo</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6094
+
+.
+`foo``bar``
+.
+<p>`foo<code>bar</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6311
+
+.
+*foo bar*
+.
+<p><em>foo bar</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6321
+
+.
+a * foo bar*
+.
+<p>a * foo bar*</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6332
+
+.
+a*"foo"*
+.
+<p>a*&quot;foo&quot;*</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6341
+
+.
+* a *
+.
+<p>* a *</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6350
+
+.
+foo*bar*
+.
+<p>foo<em>bar</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6357
+
+.
+5*6*78
+.
+<p>5<em>6</em>78</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6366
+
+.
+_foo bar_
+.
+<p><em>foo bar</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6376
+
+.
+_ foo bar_
+.
+<p>_ foo bar_</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6386
+
+.
+a_"foo"_
+.
+<p>a_&quot;foo&quot;_</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6395
+
+.
+foo_bar_
+.
+<p>foo_bar_</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6402
+
+.
+5_6_78
+.
+<p>5_6_78</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6409
+
+.
+пристаням_стремятся_
+.
+<p>пристаням_стремятся_</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6419
+
+.
+aa_"bb"_cc
+.
+<p>aa_&quot;bb&quot;_cc</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6430
+
+.
+foo-_(bar)_
+.
+<p>foo-<em>(bar)</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6442
+
+.
+_foo*
+.
+<p>_foo*</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6452
+
+.
+*foo bar *
+.
+<p>*foo bar *</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6461
+
+.
+*foo bar
+*
+.
+<p>*foo bar
+*</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6474
+
+.
+*(*foo)
+.
+<p>*(*foo)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6484
+
+.
+*(*foo*)*
+.
+<p><em>(<em>foo</em>)</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6493
+
+.
+*foo*bar
+.
+<p><em>foo</em>bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6506
+
+.
+_foo bar _
+.
+<p>_foo bar _</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6516
+
+.
+_(_foo)
+.
+<p>_(_foo)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6525
+
+.
+_(_foo_)_
+.
+<p><em>(<em>foo</em>)</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6534
+
+.
+_foo_bar
+.
+<p>_foo_bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6541
+
+.
+_пристаням_стремятся
+.
+<p>_пристаням_стремятся</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6548
+
+.
+_foo_bar_baz_
+.
+<p><em>foo_bar_baz</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6559
+
+.
+_(bar)_.
+.
+<p><em>(bar)</em>.</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6568
+
+.
+**foo bar**
+.
+<p><strong>foo bar</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6578
+
+.
+** foo bar**
+.
+<p>** foo bar**</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6589
+
+.
+a**"foo"**
+.
+<p>a**&quot;foo&quot;**</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6598
+
+.
+foo**bar**
+.
+<p>foo<strong>bar</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6607
+
+.
+__foo bar__
+.
+<p><strong>foo bar</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6617
+
+.
+__ foo bar__
+.
+<p>__ foo bar__</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6625
+
+.
+__
+foo bar__
+.
+<p>__
+foo bar__</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6637
+
+.
+a__"foo"__
+.
+<p>a__&quot;foo&quot;__</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6646
+
+.
+foo__bar__
+.
+<p>foo__bar__</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6653
+
+.
+5__6__78
+.
+<p>5__6__78</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6660
+
+.
+пристаням__стремятся__
+.
+<p>пристаням__стремятся__</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6667
+
+.
+__foo, __bar__, baz__
+.
+<p><strong>foo, <strong>bar</strong>, baz</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6678
+
+.
+foo-__(bar)__
+.
+<p>foo-<strong>(bar)</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6691
+
+.
+**foo bar **
+.
+<p>**foo bar **</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6704
+
+.
+**(**foo)
+.
+<p>**(**foo)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6714
+
+.
+*(**foo**)*
+.
+<p><em>(<strong>foo</strong>)</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6721
+
+.
+**Gomphocarpus (*Gomphocarpus physocarpus*, syn.
+*Asclepias physocarpa*)**
+.
+<p><strong>Gomphocarpus (<em>Gomphocarpus physocarpus</em>, syn.
+<em>Asclepias physocarpa</em>)</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6730
+
+.
+**foo "*bar*" foo**
+.
+<p><strong>foo &quot;<em>bar</em>&quot; foo</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6739
+
+.
+**foo**bar
+.
+<p><strong>foo</strong>bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6751
+
+.
+__foo bar __
+.
+<p>__foo bar __</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6761
+
+.
+__(__foo)
+.
+<p>__(__foo)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6771
+
+.
+_(__foo__)_
+.
+<p><em>(<strong>foo</strong>)</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6780
+
+.
+__foo__bar
+.
+<p>__foo__bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6787
+
+.
+__пристаням__стремятся
+.
+<p>__пристаням__стремятся</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6794
+
+.
+__foo__bar__baz__
+.
+<p><strong>foo__bar__baz</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6805
+
+.
+__(bar)__.
+.
+<p><strong>(bar)</strong>.</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6817
+
+.
+*foo [bar](/url)*
+.
+<p><em>foo <a href="/url">bar</a></em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6824
+
+.
+*foo
+bar*
+.
+<p><em>foo
+bar</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6836
+
+.
+_foo __bar__ baz_
+.
+<p><em>foo <strong>bar</strong> baz</em></p>
+.
+
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+src line: 6843
+
+.
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+<p><em>foo <em>bar</em> baz</em></p>
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+
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+src line: 6850
+
+.
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+.
+<p><em><em>foo</em> bar</em></p>
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+
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+src line: 6857
+
+.
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+.
+<p><em>foo <em>bar</em></em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6864
+
+.
+*foo **bar** baz*
+.
+<p><em>foo <strong>bar</strong> baz</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6870
+
+.
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+.
+<p><em>foo<strong>bar</strong>baz</em></p>
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+
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+src line: 6894
+
+.
+*foo**bar*
+.
+<p><em>foo**bar</em></p>
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+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6907
+
+.
+***foo** bar*
+.
+<p><em><strong>foo</strong> bar</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6914
+
+.
+*foo **bar***
+.
+<p><em>foo <strong>bar</strong></em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6921
+
+.
+*foo**bar***
+.
+<p><em>foo<strong>bar</strong></em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6932
+
+.
+foo***bar***baz
+.
+<p>foo<em><strong>bar</strong></em>baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6938
+
+.
+foo******bar*********baz
+.
+<p>foo<strong><strong><strong>bar</strong></strong></strong>***baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6947
+
+.
+*foo **bar *baz* bim** bop*
+.
+<p><em>foo <strong>bar <em>baz</em> bim</strong> bop</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6954
+
+.
+*foo [*bar*](/url)*
+.
+<p><em>foo <a href="/url"><em>bar</em></a></em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6963
+
+.
+** is not an empty emphasis
+.
+<p>** is not an empty emphasis</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6970
+
+.
+**** is not an empty strong emphasis
+.
+<p>**** is not an empty strong emphasis</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6983
+
+.
+**foo [bar](/url)**
+.
+<p><strong>foo <a href="/url">bar</a></strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 6990
+
+.
+**foo
+bar**
+.
+<p><strong>foo
+bar</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7002
+
+.
+__foo _bar_ baz__
+.
+<p><strong>foo <em>bar</em> baz</strong></p>
+.
+
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+src line: 7009
+
+.
+__foo __bar__ baz__
+.
+<p><strong>foo <strong>bar</strong> baz</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7016
+
+.
+____foo__ bar__
+.
+<p><strong><strong>foo</strong> bar</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7023
+
+.
+**foo **bar****
+.
+<p><strong>foo <strong>bar</strong></strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7030
+
+.
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+.
+<p><strong>foo <em>bar</em> baz</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7037
+
+.
+**foo*bar*baz**
+.
+<p><strong>foo<em>bar</em>baz</strong></p>
+.
+
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+src line: 7044
+
+.
+***foo* bar**
+.
+<p><strong><em>foo</em> bar</strong></p>
+.
+
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+src line: 7051
+
+.
+**foo *bar***
+.
+<p><strong>foo <em>bar</em></strong></p>
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+
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+src line: 7060
+
+.
+**foo *bar **baz**
+bim* bop**
+.
+<p><strong>foo <em>bar <strong>baz</strong>
+bim</em> bop</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7069
+
+.
+**foo [*bar*](/url)**
+.
+<p><strong>foo <a href="/url"><em>bar</em></a></strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7078
+
+.
+__ is not an empty emphasis
+.
+<p>__ is not an empty emphasis</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7085
+
+.
+____ is not an empty strong emphasis
+.
+<p>____ is not an empty strong emphasis</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7095
+
+.
+foo ***
+.
+<p>foo ***</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7102
+
+.
+foo *\**
+.
+<p>foo <em>*</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7109
+
+.
+foo *_*
+.
+<p>foo <em>_</em></p>
+.
+
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+src line: 7116
+
+.
+foo *****
+.
+<p>foo *****</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7123
+
+.
+foo **\***
+.
+<p>foo <strong>*</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7130
+
+.
+foo **_**
+.
+<p>foo <strong>_</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+.
+**foo*
+.
+<p>*<em>foo</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+.
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+.
+<p><em>foo</em>*</p>
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+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+
+.
+***foo**
+.
+<p>*<strong>foo</strong></p>
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+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+
+.
+****foo*
+.
+<p>***<em>foo</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+
+.
+**foo***
+.
+<p><strong>foo</strong>*</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+
+.
+*foo****
+.
+<p><em>foo</em>***</p>
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+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+
+.
+foo ___
+.
+<p>foo ___</p>
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+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+
+.
+foo _\__
+.
+<p>foo <em>_</em></p>
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+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+
+.
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+.
+<p>foo <em>*</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+
+.
+foo _____
+.
+<p>foo _____</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7214
+
+.
+foo __\___
+.
+<p>foo <strong>_</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7221
+
+.
+foo __*__
+.
+<p>foo <strong>*</strong></p>
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+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7228
+
+.
+__foo_
+.
+<p>_<em>foo</em></p>
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+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+.
+_foo__
+.
+<p><em>foo</em>_</p>
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+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7246
+
+.
+___foo__
+.
+<p>_<strong>foo</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7253
+
+.
+____foo_
+.
+<p>___<em>foo</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7260
+
+.
+__foo___
+.
+<p><strong>foo</strong>_</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7267
+
+.
+_foo____
+.
+<p><em>foo</em>___</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7277
+
+.
+**foo**
+.
+<p><strong>foo</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7284
+
+.
+*_foo_*
+.
+<p><em><em>foo</em></em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7291
+
+.
+__foo__
+.
+<p><strong>foo</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7298
+
+.
+_*foo*_
+.
+<p><em><em>foo</em></em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7308
+
+.
+****foo****
+.
+<p><strong><strong>foo</strong></strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7315
+
+.
+____foo____
+.
+<p><strong><strong>foo</strong></strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7326
+
+.
+******foo******
+.
+<p><strong><strong><strong>foo</strong></strong></strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7335
+
+.
+***foo***
+.
+<p><em><strong>foo</strong></em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7342
+
+.
+_____foo_____
+.
+<p><em><strong><strong>foo</strong></strong></em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7351
+
+.
+*foo _bar* baz_
+.
+<p><em>foo _bar</em> baz_</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7358
+
+.
+*foo __bar *baz bim__ bam*
+.
+<p><em>foo <strong>bar *baz bim</strong> bam</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7367
+
+.
+**foo **bar baz**
+.
+<p>**foo <strong>bar baz</strong></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7374
+
+.
+*foo *bar baz*
+.
+<p>*foo <em>bar baz</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7383
+
+.
+*[bar*](/url)
+.
+<p>*<a href="/url">bar*</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7390
+
+.
+_foo [bar_](/url)
+.
+<p>_foo <a href="/url">bar_</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7397
+
+.
+*<img src="foo" title="*"/>
+.
+<p>*<img src="foo" title="*"/></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7404
+
+.
+**<a href="**">
+.
+<p>**<a href="**"></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7411
+
+.
+__<a href="__">
+.
+<p>__<a href="__"></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7418
+
+.
+*a `*`*
+.
+<p><em>a <code>*</code></em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7425
+
+.
+_a `_`_
+.
+<p><em>a <code>_</code></em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7432
+
+.
+**a<http://foo.bar/?q=**>
+.
+<p>**a<a href="http://foo.bar/?q=**">http://foo.bar/?q=**</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7439
+
+.
+__a<http://foo.bar/?q=__>
+.
+<p>__a<a href="http://foo.bar/?q=__">http://foo.bar/?q=__</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7527
+
+.
+[link](/uri "title")
+.
+<p><a href="/uri" title="title">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7537
+
+.
+[link](/uri)
+.
+<p><a href="/uri">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7543
+
+.
+[](./target.md)
+.
+<p><a href="./target.md"></a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7550
+
+.
+[link]()
+.
+<p><a href="">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7557
+
+.
+[link](<>)
+.
+<p><a href="">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7564
+
+.
+[]()
+.
+<p><a href=""></a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7573
+
+.
+[link](/my uri)
+.
+<p>[link](/my uri)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7579
+
+.
+[link](</my uri>)
+.
+<p><a href="/my%20uri">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7588
+
+.
+[link](foo
+bar)
+.
+<p>[link](foo
+bar)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7596
+
+.
+[link](<foo
+bar>)
+.
+<p>[link](<foo
+bar>)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7607
+
+.
+[a](<b)c>)
+.
+<p><a href="b)c">a</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7615
+
+.
+[link](<foo\>)
+.
+<p>[link](&lt;foo&gt;)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7624
+
+.
+[a](<b)c
+[a](<b)c>
+[a](<b>c)
+.
+<p>[a](&lt;b)c
+[a](&lt;b)c&gt;
+[a](<b>c)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7636
+
+.
+[link](\(foo\))
+.
+<p><a href="(foo)">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7645
+
+.
+[link](foo(and(bar)))
+.
+<p><a href="foo(and(bar))">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7654
+
+.
+[link](foo(and(bar))
+.
+<p>[link](foo(and(bar))</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7661
+
+.
+[link](foo\(and\(bar\))
+.
+<p><a href="foo(and(bar)">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7668
+
+.
+[link](<foo(and(bar)>)
+.
+<p><a href="foo(and(bar)">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7678
+
+.
+[link](foo\)\:)
+.
+<p><a href="foo):">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7687
+
+.
+[link](#fragment)
+
+[link](http://example.com#fragment)
+
+[link](http://example.com?foo=3#frag)
+.
+<p><a href="#fragment">link</a></p>
+<p><a href="http://example.com#fragment">link</a></p>
+<p><a href="http://example.com?foo=3#frag">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7703
+
+.
+[link](foo\bar)
+.
+<p><a href="foo%5Cbar">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7719
+
+.
+[link](foo%20b&auml;)
+.
+<p><a href="foo%20b%C3%A4">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7730
+
+.
+[link]("title")
+.
+<p><a href="%22title%22">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7739
+
+.
+[link](/url "title")
+[link](/url 'title')
+[link](/url (title))
+.
+<p><a href="/url" title="title">link</a>
+<a href="/url" title="title">link</a>
+<a href="/url" title="title">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7753
+
+.
+[link](/url "title \"&quot;")
+.
+<p><a href="/url" title="title &quot;&quot;">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7764
+
+.
+[link](/url "title")
+.
+<p><a href="/url%C2%A0%22title%22">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7773
+
+.
+[link](/url "title "and" title")
+.
+<p>[link](/url &quot;title &quot;and&quot; title&quot;)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7782
+
+.
+[link](/url 'title "and" title')
+.
+<p><a href="/url" title="title &quot;and&quot; title">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7807
+
+.
+[link](   /uri
+  "title"  )
+.
+<p><a href="/uri" title="title">link</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7818
+
+.
+[link] (/uri)
+.
+<p>[link] (/uri)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7828
+
+.
+[link [foo [bar]]](/uri)
+.
+<p><a href="/uri">link [foo [bar]]</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7835
+
+.
+[link] bar](/uri)
+.
+<p>[link] bar](/uri)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7842
+
+.
+[link [bar](/uri)
+.
+<p>[link <a href="/uri">bar</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7849
+
+.
+[link \[bar](/uri)
+.
+<p><a href="/uri">link [bar</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7858
+
+.
+[link *foo **bar** `#`*](/uri)
+.
+<p><a href="/uri">link <em>foo <strong>bar</strong> <code>#</code></em></a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7865
+
+.
+[![moon](moon.jpg)](/uri)
+.
+<p><a href="/uri"><img src="moon.jpg" alt="moon" /></a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7874
+
+.
+[foo [bar](/uri)](/uri)
+.
+<p>[foo <a href="/uri">bar</a>](/uri)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7881
+
+.
+[foo *[bar [baz](/uri)](/uri)*](/uri)
+.
+<p>[foo <em>[bar <a href="/uri">baz</a>](/uri)</em>](/uri)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7888
+
+.
+![[[foo](uri1)](uri2)](uri3)
+.
+<p><img src="uri3" alt="[foo](uri2)" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7898
+
+.
+*[foo*](/uri)
+.
+<p>*<a href="/uri">foo*</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7905
+
+.
+[foo *bar](baz*)
+.
+<p><a href="baz*">foo *bar</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7915
+
+.
+*foo [bar* baz]
+.
+<p><em>foo [bar</em> baz]</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7925
+
+.
+[foo <bar attr="](baz)">
+.
+<p>[foo <bar attr="](baz)"></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7932
+
+.
+[foo`](/uri)`
+.
+<p>[foo<code>](/uri)</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7939
+
+.
+[foo<http://example.com/?search=](uri)>
+.
+<p>[foo<a href="http://example.com/?search=%5D(uri)">http://example.com/?search=](uri)</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7977
+
+.
+[foo][bar]
+
+[bar]: /url "title"
+.
+<p><a href="/url" title="title">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 7992
+
+.
+[link [foo [bar]]][ref]
+
+[ref]: /uri
+.
+<p><a href="/uri">link [foo [bar]]</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8001
+
+.
+[link \[bar][ref]
+
+[ref]: /uri
+.
+<p><a href="/uri">link [bar</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8012
+
+.
+[link *foo **bar** `#`*][ref]
+
+[ref]: /uri
+.
+<p><a href="/uri">link <em>foo <strong>bar</strong> <code>#</code></em></a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8021
+
+.
+[![moon](moon.jpg)][ref]
+
+[ref]: /uri
+.
+<p><a href="/uri"><img src="moon.jpg" alt="moon" /></a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8032
+
+.
+[foo [bar](/uri)][ref]
+
+[ref]: /uri
+.
+<p>[foo <a href="/uri">bar</a>]<a href="/uri">ref</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8041
+
+.
+[foo *bar [baz][ref]*][ref]
+
+[ref]: /uri
+.
+<p>[foo <em>bar <a href="/uri">baz</a></em>]<a href="/uri">ref</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8056
+
+.
+*[foo*][ref]
+
+[ref]: /uri
+.
+<p>*<a href="/uri">foo*</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8065
+
+.
+[foo *bar][ref]*
+
+[ref]: /uri
+.
+<p><a href="/uri">foo *bar</a>*</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8077
+
+.
+[foo <bar attr="][ref]">
+
+[ref]: /uri
+.
+<p>[foo <bar attr="][ref]"></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8086
+
+.
+[foo`][ref]`
+
+[ref]: /uri
+.
+<p>[foo<code>][ref]</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8095
+
+.
+[foo<http://example.com/?search=][ref]>
+
+[ref]: /uri
+.
+<p>[foo<a href="http://example.com/?search=%5D%5Bref%5D">http://example.com/?search=][ref]</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8106
+
+.
+[foo][BaR]
+
+[bar]: /url "title"
+.
+<p><a href="/url" title="title">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8117
+
+.
+[ẞ]
+
+[SS]: /url
+.
+<p><a href="/url">ẞ</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8129
+
+.
+[Foo
+  bar]: /url
+
+[Baz][Foo bar]
+.
+<p><a href="/url">Baz</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8142
+
+.
+[foo] [bar]
+
+[bar]: /url "title"
+.
+<p>[foo] <a href="/url" title="title">bar</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8151
+
+.
+[foo]
+[bar]
+
+[bar]: /url "title"
+.
+<p>[foo]
+<a href="/url" title="title">bar</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8192
+
+.
+[foo]: /url1
+
+[foo]: /url2
+
+[bar][foo]
+.
+<p><a href="/url1">bar</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8207
+
+.
+[bar][foo\!]
+
+[foo!]: /url
+.
+<p>[bar][foo!]</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8219
+
+.
+[foo][ref[]
+
+[ref[]: /uri
+.
+<p>[foo][ref[]</p>
+<p>[ref[]: /uri</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8229
+
+.
+[foo][ref[bar]]
+
+[ref[bar]]: /uri
+.
+<p>[foo][ref[bar]]</p>
+<p>[ref[bar]]: /uri</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8239
+
+.
+[[[foo]]]
+
+[[[foo]]]: /url
+.
+<p>[[[foo]]]</p>
+<p>[[[foo]]]: /url</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8249
+
+.
+[foo][ref\[]
+
+[ref\[]: /uri
+.
+<p><a href="/uri">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8260
+
+.
+[bar\\]: /uri
+
+[bar\\]
+.
+<p><a href="/uri">bar\</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8272
+
+.
+[]
+
+[]: /uri
+.
+<p>[]</p>
+<p>[]: /uri</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8282
+
+.
+[
+ ]
+
+[
+ ]: /uri
+.
+<p>[
+]</p>
+<p>[
+]: /uri</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8305
+
+.
+[foo][]
+
+[foo]: /url "title"
+.
+<p><a href="/url" title="title">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8314
+
+.
+[*foo* bar][]
+
+[*foo* bar]: /url "title"
+.
+<p><a href="/url" title="title"><em>foo</em> bar</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8325
+
+.
+[Foo][]
+
+[foo]: /url "title"
+.
+<p><a href="/url" title="title">Foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8338
+
+.
+[foo] 
+[]
+
+[foo]: /url "title"
+.
+<p><a href="/url" title="title">foo</a>
+[]</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8358
+
+.
+[foo]
+
+[foo]: /url "title"
+.
+<p><a href="/url" title="title">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8367
+
+.
+[*foo* bar]
+
+[*foo* bar]: /url "title"
+.
+<p><a href="/url" title="title"><em>foo</em> bar</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8376
+
+.
+[[*foo* bar]]
+
+[*foo* bar]: /url "title"
+.
+<p>[<a href="/url" title="title"><em>foo</em> bar</a>]</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8385
+
+.
+[[bar [foo]
+
+[foo]: /url
+.
+<p>[[bar <a href="/url">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8396
+
+.
+[Foo]
+
+[foo]: /url "title"
+.
+<p><a href="/url" title="title">Foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8407
+
+.
+[foo] bar
+
+[foo]: /url
+.
+<p><a href="/url">foo</a> bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8419
+
+.
+\[foo]
+
+[foo]: /url "title"
+.
+<p>[foo]</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8431
+
+.
+[foo*]: /url
+
+*[foo*]
+.
+<p>*<a href="/url">foo*</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8443
+
+.
+[foo][bar]
+
+[foo]: /url1
+[bar]: /url2
+.
+<p><a href="/url2">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8452
+
+.
+[foo][]
+
+[foo]: /url1
+.
+<p><a href="/url1">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8462
+
+.
+[foo]()
+
+[foo]: /url1
+.
+<p><a href="">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8470
+
+.
+[foo](not a link)
+
+[foo]: /url1
+.
+<p><a href="/url1">foo</a>(not a link)</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8481
+
+.
+[foo][bar][baz]
+
+[baz]: /url
+.
+<p>[foo]<a href="/url">bar</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8493
+
+.
+[foo][bar][baz]
+
+[baz]: /url1
+[bar]: /url2
+.
+<p><a href="/url2">foo</a><a href="/url1">baz</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8506
+
+.
+[foo][bar][baz]
+
+[baz]: /url1
+[foo]: /url2
+.
+<p>[foo]<a href="/url1">bar</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8529
+
+.
+![foo](/url "title")
+.
+<p><img src="/url" alt="foo" title="title" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8536
+
+.
+![foo *bar*]
+
+[foo *bar*]: train.jpg "train & tracks"
+.
+<p><img src="train.jpg" alt="foo bar" title="train &amp; tracks" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8545
+
+.
+![foo ![bar](/url)](/url2)
+.
+<p><img src="/url2" alt="foo bar" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8552
+
+.
+![foo [bar](/url)](/url2)
+.
+<p><img src="/url2" alt="foo bar" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8566
+
+.
+![foo *bar*][]
+
+[foo *bar*]: train.jpg "train & tracks"
+.
+<p><img src="train.jpg" alt="foo bar" title="train &amp; tracks" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8575
+
+.
+![foo *bar*][foobar]
+
+[FOOBAR]: train.jpg "train & tracks"
+.
+<p><img src="train.jpg" alt="foo bar" title="train &amp; tracks" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8584
+
+.
+![foo](train.jpg)
+.
+<p><img src="train.jpg" alt="foo" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8591
+
+.
+My ![foo bar](/path/to/train.jpg  "title"   )
+.
+<p>My <img src="/path/to/train.jpg" alt="foo bar" title="title" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8598
+
+.
+![foo](<url>)
+.
+<p><img src="url" alt="foo" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8605
+
+.
+![](/url)
+.
+<p><img src="/url" alt="" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8614
+
+.
+![foo][bar]
+
+[bar]: /url
+.
+<p><img src="/url" alt="foo" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8623
+
+.
+![foo][bar]
+
+[BAR]: /url
+.
+<p><img src="/url" alt="foo" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8634
+
+.
+![foo][]
+
+[foo]: /url "title"
+.
+<p><img src="/url" alt="foo" title="title" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8643
+
+.
+![*foo* bar][]
+
+[*foo* bar]: /url "title"
+.
+<p><img src="/url" alt="foo bar" title="title" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8654
+
+.
+![Foo][]
+
+[foo]: /url "title"
+.
+<p><img src="/url" alt="Foo" title="title" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8666
+
+.
+![foo] 
+[]
+
+[foo]: /url "title"
+.
+<p><img src="/url" alt="foo" title="title" />
+[]</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8679
+
+.
+![foo]
+
+[foo]: /url "title"
+.
+<p><img src="/url" alt="foo" title="title" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8688
+
+.
+![*foo* bar]
+
+[*foo* bar]: /url "title"
+.
+<p><img src="/url" alt="foo bar" title="title" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8699
+
+.
+![[foo]]
+
+[[foo]]: /url "title"
+.
+<p>![[foo]]</p>
+<p>[[foo]]: /url &quot;title&quot;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8711
+
+.
+![Foo]
+
+[foo]: /url "title"
+.
+<p><img src="/url" alt="Foo" title="title" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8723
+
+.
+!\[foo]
+
+[foo]: /url "title"
+.
+<p>![foo]</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8735
+
+.
+\![foo]
+
+[foo]: /url "title"
+.
+<p>!<a href="/url" title="title">foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8768
+
+.
+<http://foo.bar.baz>
+.
+<p><a href="http://foo.bar.baz">http://foo.bar.baz</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8775
+
+.
+<http://foo.bar.baz/test?q=hello&id=22&boolean>
+.
+<p><a href="http://foo.bar.baz/test?q=hello&amp;id=22&amp;boolean">http://foo.bar.baz/test?q=hello&amp;id=22&amp;boolean</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8782
+
+.
+<irc://foo.bar:2233/baz>
+.
+<p><a href="irc://foo.bar:2233/baz">irc://foo.bar:2233/baz</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8791
+
+.
+<MAILTO:FOO@BAR.BAZ>
+.
+<p><a href="MAILTO:FOO@BAR.BAZ">MAILTO:FOO@BAR.BAZ</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8803
+
+.
+<a+b+c:d>
+.
+<p><a href="a+b+c:d">a+b+c:d</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8810
+
+.
+<made-up-scheme://foo,bar>
+.
+<p><a href="made-up-scheme://foo,bar">made-up-scheme://foo,bar</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8817
+
+.
+<http://../>
+.
+<p><a href="http://../">http://../</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8824
+
+.
+<localhost:5001/foo>
+.
+<p><a href="localhost:5001/foo">localhost:5001/foo</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8833
+
+.
+<http://foo.bar/baz bim>
+.
+<p>&lt;http://foo.bar/baz bim&gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8842
+
+.
+<http://example.com/\[\>
+.
+<p><a href="http://example.com/%5C%5B%5C">http://example.com/\[\</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8864
+
+.
+<foo@bar.example.com>
+.
+<p><a href="mailto:foo@bar.example.com">foo@bar.example.com</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8871
+
+.
+<foo+special@Bar.baz-bar0.com>
+.
+<p><a href="mailto:foo+special@Bar.baz-bar0.com">foo+special@Bar.baz-bar0.com</a></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8880
+
+.
+<foo\+@bar.example.com>
+.
+<p>&lt;foo+@bar.example.com&gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8889
+
+.
+<>
+.
+<p>&lt;&gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8896
+
+.
+< http://foo.bar >
+.
+<p>&lt; http://foo.bar &gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8903
+
+.
+<m:abc>
+.
+<p>&lt;m:abc&gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8910
+
+.
+<foo.bar.baz>
+.
+<p>&lt;foo.bar.baz&gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8917
+
+.
+http://example.com
+.
+<p>http://example.com</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 8924
+
+.
+foo@bar.example.com
+.
+<p>foo@bar.example.com</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9005
+
+.
+<a><bab><c2c>
+.
+<p><a><bab><c2c></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9014
+
+.
+<a/><b2/>
+.
+<p><a/><b2/></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9023
+
+.
+<a  /><b2
+data="foo" >
+.
+<p><a  /><b2
+data="foo" ></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9034
+
+.
+<a foo="bar" bam = 'baz <em>"</em>'
+_boolean zoop:33=zoop:33 />
+.
+<p><a foo="bar" bam = 'baz <em>"</em>'
+_boolean zoop:33=zoop:33 /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9045
+
+.
+Foo <responsive-image src="foo.jpg" />
+.
+<p>Foo <responsive-image src="foo.jpg" /></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9054
+
+.
+<33> <__>
+.
+<p>&lt;33&gt; &lt;__&gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9063
+
+.
+<a h*#ref="hi">
+.
+<p>&lt;a h*#ref=&quot;hi&quot;&gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9072
+
+.
+<a href="hi'> <a href=hi'>
+.
+<p>&lt;a href=&quot;hi'&gt; &lt;a href=hi'&gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9081
+
+.
+< a><
+foo><bar/ >
+<foo bar=baz
+bim!bop />
+.
+<p>&lt; a&gt;&lt;
+foo&gt;&lt;bar/ &gt;
+&lt;foo bar=baz
+bim!bop /&gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9096
+
+.
+<a href='bar'title=title>
+.
+<p>&lt;a href='bar'title=title&gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9105
+
+.
+</a></foo >
+.
+<p></a></foo ></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9114
+
+.
+</a href="foo">
+.
+<p>&lt;/a href=&quot;foo&quot;&gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9123
+
+.
+foo <!-- this is a
+comment - with hyphen -->
+.
+<p>foo <!-- this is a
+comment - with hyphen --></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9132
+
+.
+foo <!-- not a comment -- two hyphens -->
+.
+<p>foo &lt;!-- not a comment -- two hyphens --&gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9141
+
+.
+foo <!--> foo -->
+
+foo <!-- foo--->
+.
+<p>foo &lt;!--&gt; foo --&gt;</p>
+<p>foo &lt;!-- foo---&gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9153
+
+.
+foo <?php echo $a; ?>
+.
+<p>foo <?php echo $a; ?></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9162
+
+.
+foo <!ELEMENT br EMPTY>
+.
+<p>foo <!ELEMENT br EMPTY></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9171
+
+.
+foo <![CDATA[>&<]]>
+.
+<p>foo <![CDATA[>&<]]></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9181
+
+.
+foo <a href="&ouml;">
+.
+<p>foo <a href="&ouml;"></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9190
+
+.
+foo <a href="\*">
+.
+<p>foo <a href="\*"></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9197
+
+.
+<a href="\"">
+.
+<p>&lt;a href=&quot;&quot;&quot;&gt;</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9211
+
+.
+foo  
+baz
+.
+<p>foo<br />
+baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9223
+
+.
+foo\
+baz
+.
+<p>foo<br />
+baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9234
+
+.
+foo       
+baz
+.
+<p>foo<br />
+baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9245
+
+.
+foo  
+     bar
+.
+<p>foo<br />
+bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9254
+
+.
+foo\
+     bar
+.
+<p>foo<br />
+bar</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9266
+
+.
+*foo  
+bar*
+.
+<p><em>foo<br />
+bar</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9275
+
+.
+*foo\
+bar*
+.
+<p><em>foo<br />
+bar</em></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9286
+
+.
+`code  
+span`
+.
+<p><code>code   span</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9294
+
+.
+`code\
+span`
+.
+<p><code>code\ span</code></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9304
+
+.
+<a href="foo  
+bar">
+.
+<p><a href="foo  
+bar"></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9313
+
+.
+<a href="foo\
+bar">
+.
+<p><a href="foo\
+bar"></p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9326
+
+.
+foo\
+.
+<p>foo\</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9333
+
+.
+foo  
+.
+<p>foo</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9340
+
+.
+### foo\
+.
+<h3>foo\</h3>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9347
+
+.
+### foo  
+.
+<h3>foo</h3>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9362
+
+.
+foo
+baz
+.
+<p>foo
+baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9374
+
+.
+foo 
+ baz
+.
+<p>foo
+baz</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9394
+
+.
+hello $.;'there
+.
+<p>hello $.;'there</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9401
+
+.
+Foo χρῆν
+.
+<p>Foo χρῆν</p>
+.
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 9410
+
+.
+Multiple     spaces
+.
+<p>Multiple     spaces</p>
+.
+
diff --git a/tests/test_port/fixtures/fatal.md b/tests/test_port/fixtures/fatal.md
new file mode 100644
index 0000000..7b2afcf
--- /dev/null
+++ b/tests/test_port/fixtures/fatal.md
@@ -0,0 +1,41 @@
+Should not throw exception on invalid chars in URL (`*` not allowed in path) [malformed URI]
+.
+[foo](<&#x25;test>)
+.
+<p><a href="%25test">foo</a></p>
+.
+
+
+Should not throw exception on broken utf-8 sequence in URL [malformed URI]
+.
+[foo](%C3)
+.
+<p><a href="%C3">foo</a></p>
+.
+
+
+Should not throw exception on broken utf-16 surrogates sequence in URL [malformed URI]
+.
+[foo](&#xD800;)
+.
+<p><a href="&amp;#xD800;">foo</a></p>
+.
+
+
+Should not hang comments regexp
+.
+foo <!--- xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ->
+
+foo <!------------------------------------------------------------------->
+.
+<p>foo &lt;!— xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -&gt;</p>
+<p>foo &lt;!-------------------------------------------------------------------&gt;</p>
+.
+
+
+Should not hang cdata regexp
+.
+foo <![CDATA[ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ]>
+.
+<p>foo &lt;![CDATA[ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ]&gt;</p>
+.
diff --git a/tests/test_port/fixtures/issue-fixes.md b/tests/test_port/fixtures/issue-fixes.md
new file mode 100644
index 0000000..0c693b0
--- /dev/null
+++ b/tests/test_port/fixtures/issue-fixes.md
@@ -0,0 +1,38 @@
+#31 empty lines after certain lists raises exception:
+.
+> a
+
+- b
+
+
+.
+<blockquote>
+<p>a</p>
+</blockquote>
+<ul>
+<li>b</li>
+</ul>
+.
+
+#50 blank lines after block quotes
+.
+> A Block Quote
+
+> Another Block Quote
+
+
+.
+<blockquote>
+<p>A Block Quote</p>
+</blockquote>
+<blockquote>
+<p>Another Block Quote</p>
+</blockquote>
+.
+
+#80 UnicodeError with codepoints larger than 0xFFFF
+.
+&#x1F4AC;
+.
+<p>💬</p>
+.
diff --git a/tests/test_port/fixtures/linkify.md b/tests/test_port/fixtures/linkify.md
new file mode 100644
index 0000000..9edb78f
--- /dev/null
+++ b/tests/test_port/fixtures/linkify.md
@@ -0,0 +1,99 @@
+linkify
+.
+url http://www.youtube.com/watch?v=5Jt5GEr4AYg.
+.
+<p>url <a href="http://www.youtube.com/watch?v=5Jt5GEr4AYg">http://www.youtube.com/watch?v=5Jt5GEr4AYg</a>.</p>
+.
+
+
+don't touch text in links
+.
+[https://example.com](https://example.com)
+.
+<p><a href="https://example.com">https://example.com</a></p>
+.
+
+
+don't touch text in autolinks
+.
+<https://example.com>
+.
+<p><a href="https://example.com">https://example.com</a></p>
+.
+
+
+don't touch text in html <a> tags
+.
+<a href="https://example.com">https://example.com</a>
+.
+<p><a href="https://example.com">https://example.com</a></p>
+.
+
+
+match links without protocol
+.
+www.example.org
+.
+<p><a href="http://www.example.org">www.example.org</a></p>
+.
+
+
+emails
+.
+test@example.com
+
+mailto:test@example.com
+.
+<p><a href="mailto:test@example.com">test@example.com</a></p>
+<p><a href="mailto:test@example.com">mailto:test@example.com</a></p>
+.
+
+
+typorgapher should not break href
+.
+http://example.com/(c)
+.
+<p><a href="http://example.com/(c)">http://example.com/(c)</a></p>
+.
+
+before line
+.
+before
+github.com
+.
+<p>before
+<a href="http://github.com">github.com</a></p>
+.
+
+after line
+.
+github.com
+after
+.
+<p><a href="http://github.com">github.com</a>
+after</p>
+.
+
+before after lines
+.
+before
+github.com
+after
+.
+<p>before
+<a href="http://github.com">github.com</a>
+after</p>
+.
+
+before after lines with blank line
+.
+before
+
+github.com
+
+after
+.
+<p>before</p>
+<p><a href="http://github.com">github.com</a></p>
+<p>after</p>
+.
\ No newline at end of file
diff --git a/tests/test_port/fixtures/normalize.md b/tests/test_port/fixtures/normalize.md
new file mode 100644
index 0000000..4a00508
--- /dev/null
+++ b/tests/test_port/fixtures/normalize.md
@@ -0,0 +1,39 @@
+
+Encode link destination, decode text inside it:
+
+.
+<http://example.com/α%CE%B2γ%CE%B4>
+.
+<p><a href="http://example.com/%CE%B1%CE%B2%CE%B3%CE%B4">http://example.com/αβγδ</a></p>
+.
+
+.
+[foo](http://example.com/α%CE%B2γ%CE%B4)
+.
+<p><a href="http://example.com/%CE%B1%CE%B2%CE%B3%CE%B4">foo</a></p>
+.
+
+
+Keep %25 as is because decoding it may break urls, #720
+.
+<https://www.google.com/search?q=hello%2E%252Ehello>
+.
+<p><a href="https://www.google.com/search?q=hello%2E%252Ehello">https://www.google.com/search?q=hello.%252Ehello</a></p>
+.
+
+
+Don't encode domains in unknown schemas:
+
+.
+[](skype:γγγ)
+.
+<p><a href="skype:%CE%B3%CE%B3%CE%B3"></a></p>
+.
+
+
+Square brackets are allowed
+.
+[foo](https://bar]baz.org)
+.
+<p><a href="https://bar%5Dbaz.org">foo</a></p>
+.
diff --git a/tests/test_port/fixtures/proto.md b/tests/test_port/fixtures/proto.md
new file mode 100644
index 0000000..87fdccf
--- /dev/null
+++ b/tests/test_port/fixtures/proto.md
@@ -0,0 +1,16 @@
+.
+[__proto__]
+
+[__proto__]: blah
+.
+<p><a href="blah"><strong>proto</strong></a></p>
+.
+
+
+.
+[hasOwnProperty]
+
+[hasOwnProperty]: blah
+.
+<p><a href="blah">hasOwnProperty</a></p>
+.
diff --git a/tests/test_port/fixtures/punycode.md b/tests/test_port/fixtures/punycode.md
new file mode 100644
index 0000000..c726e82
--- /dev/null
+++ b/tests/test_port/fixtures/punycode.md
@@ -0,0 +1,77 @@
+Should decode punycode:
+
+.
+<http://xn--n3h.net/>
+.
+<p><a href="http://xn--n3h.net/">http://☃.net/</a></p>
+.
+
+.
+<http://☃.net/>
+.
+<p><a href="http://xn--n3h.net/">http://☃.net/</a></p>
+.
+
+Invalid punycode:
+
+.
+<http://xn--xn.com/>
+.
+<p><a href="http://xn--xn.com/">http://xn--xn.com/</a></p>
+.
+
+Invalid punycode (non-ascii):
+
+.
+<http://xn--γ.com/>
+.
+<p><a href="http://xn--xn---emd.com/">http://xn--γ.com/</a></p>
+.
+
+Two slashes should start a domain:
+
+.
+[](//☃.net/)
+.
+<p><a href="//xn--n3h.net/"></a></p>
+.
+
+Should auto-add protocol to autolinks:
+
+.
+test google.com foo
+.
+<p>test <a href="http://google.com">google.com</a> foo</p>
+.
+
+Should support IDN in autolinks:
+
+.
+test http://xn--n3h.net/ foo
+.
+<p>test <a href="http://xn--n3h.net/">http://☃.net/</a> foo</p>
+.
+
+.
+test http://☃.net/ foo
+.
+<p>test <a href="http://xn--n3h.net/">http://☃.net/</a> foo</p>
+.
+
+.
+test //xn--n3h.net/ foo
+.
+<p>test <a href="//xn--n3h.net/">//☃.net/</a> foo</p>
+.
+
+.
+test xn--n3h.net foo
+.
+<p>test <a href="http://xn--n3h.net">☃.net</a> foo</p>
+.
+
+.
+test xn--n3h@xn--n3h.net foo
+.
+<p>test <a href="mailto:xn--n3h@xn--n3h.net">xn--n3h@☃.net</a> foo</p>
+.
diff --git a/tests/test_port/fixtures/smartquotes.md b/tests/test_port/fixtures/smartquotes.md
new file mode 100644
index 0000000..70378b8
--- /dev/null
+++ b/tests/test_port/fixtures/smartquotes.md
@@ -0,0 +1,166 @@
+Should parse nested quotes:
+.
+"foo 'bar' baz"
+
+'foo 'bar' baz'
+.
+<p>“foo ‘bar’ baz”</p>
+<p>‘foo ‘bar’ baz’</p>
+.
+
+
+Should not overlap quotes:
+.
+'foo "bar' baz"
+.
+<p>‘foo &quot;bar’ baz&quot;</p>
+.
+
+
+Should match quotes on the same level:
+.
+"foo *bar* baz"
+.
+<p>“foo <em>bar</em> baz”</p>
+.
+
+
+Should handle adjacent nested quotes:
+.
+'"double in single"'
+
+"'single in double'"
+.
+<p>‘“double in single”’</p>
+<p>“‘single in double’”</p>
+.
+
+
+
+Should not match quotes on different levels:
+.
+*"foo* bar"
+
+"foo *bar"*
+
+*"foo* bar *baz"*
+.
+<p><em>&quot;foo</em> bar&quot;</p>
+<p>&quot;foo <em>bar&quot;</em></p>
+<p><em>&quot;foo</em> bar <em>baz&quot;</em></p>
+.
+
+Smartquotes should not overlap with other tags:
+.
+*foo "bar* *baz" quux*
+.
+<p><em>foo &quot;bar</em> <em>baz&quot; quux</em></p>
+.
+
+
+Should try and find matching quote in this case:
+.
+"foo "bar 'baz"
+.
+<p>&quot;foo “bar 'baz”</p>
+.
+
+
+Should not touch 'inches' in quotes:
+.
+"Monitor 21"" and "Monitor""
+.
+<p>“Monitor 21&quot;” and “Monitor”&quot;</p>
+.
+
+
+Should render an apostrophe as a rsquo:
+.
+This isn't and can't be the best approach to implement this...
+.
+<p>This isn’t and can’t be the best approach to implement this…</p>
+.
+
+
+Apostrophe could end the word, that's why original smartypants replaces all of them as rsquo:
+.
+users' stuff
+.
+<p>users’ stuff</p>
+.
+
+Quotes between punctuation chars:
+
+.
+"(hai)".
+.
+<p>“(hai)”.</p>
+.
+
+Quotes at the start/end of the tokens:
+.
+"*foo* bar"
+
+"foo *bar*"
+
+"*foo bar*"
+.
+<p>“<em>foo</em> bar”</p>
+<p>“foo <em>bar</em>”</p>
+<p>“<em>foo bar</em>”</p>
+.
+
+Should treat softbreak as a space:
+.
+"this"
+and "that".
+
+"this" and
+"that".
+.
+<p>“this”
+and “that”.</p>
+<p>“this” and
+“that”.</p>
+.
+
+Should treat hardbreak as a space:
+.
+"this"\
+and "that".
+
+"this" and\
+"that".
+.
+<p>“this”<br />
+and “that”.</p>
+<p>“this” and<br />
+“that”.</p>
+.
+
+Should allow quotes adjacent to other punctuation characters, #643:
+.
+The dog---"'man's' best friend"
+.
+<p>The dog—“‘man’s’ best friend”</p>
+.
+
+Should parse quotes adjacent to code block, #677:
+.
+"test `code`"
+
+"`code` test"
+.
+<p>“test <code>code</code>”</p>
+<p>“<code>code</code> test”</p>
+.
+
+Should parse quotes adjacent to inline html, #677:
+.
+"test <br>"
+
+"<br> test"
+.
+<p>“test <br>”</p>
+<p>“<br> test”</p>
+.
\ No newline at end of file
diff --git a/tests/test_port/fixtures/strikethrough.md b/tests/test_port/fixtures/strikethrough.md
new file mode 100644
index 0000000..ca15b6f
--- /dev/null
+++ b/tests/test_port/fixtures/strikethrough.md
@@ -0,0 +1,136 @@
+.
+~~Strikeout~~
+.
+<p><s>Strikeout</s></p>
+.
+
+.
+x ~~~~foo~~ bar~~
+.
+<p>x <s><s>foo</s> bar</s></p>
+.
+
+.
+x ~~foo ~~bar~~~~
+.
+<p>x <s>foo <s>bar</s></s></p>
+.
+
+.
+x ~~~~foo~~~~
+.
+<p>x <s><s>foo</s></s></p>
+.
+
+.
+x ~~a ~~foo~~~~~~~~~~~bar~~ b~~
+
+x ~~a ~~foo~~~~~~~~~~~~bar~~ b~~
+.
+<p>x <s>a <s>foo</s></s>~~~<s><s>bar</s> b</s></p>
+<p>x <s>a <s>foo</s></s>~~~~<s><s>bar</s> b</s></p>
+.
+
+
+Strikeouts have the same priority as emphases:
+.
+**~~test**~~
+
+~~**test~~**
+.
+<p><strong>~~test</strong>~~</p>
+<p><s>**test</s>**</p>
+.
+
+
+Strikeouts have the same priority as emphases with respect to links:
+.
+[~~link]()~~
+
+~~[link~~]()
+.
+<p><a href="">~~link</a>~~</p>
+<p>~~<a href="">link~~</a></p>
+.
+
+
+Strikeouts have the same priority as emphases with respect to backticks:
+.
+~~`code~~`
+
+`~~code`~~
+.
+<p>~~<code>code~~</code></p>
+<p><code>~~code</code>~~</p>
+.
+
+
+Nested strikeouts:
+.
+~~foo ~~bar~~ baz~~
+
+~~f **o ~~o b~~ a** r~~
+.
+<p><s>foo <s>bar</s> baz</s></p>
+<p><s>f <strong>o <s>o b</s> a</strong> r</s></p>
+.
+
+
+Should not have a whitespace between text and "~~":
+.
+foo ~~ bar ~~ baz
+.
+<p>foo ~~ bar ~~ baz</p>
+.
+
+
+Should parse strikethrough within link tags:
+.
+[~~foo~~]()
+.
+<p><a href=""><s>foo</s></a></p>
+.
+
+
+Newline should be considered a whitespace:
+.
+~~test
+~~
+
+~~
+test~~
+
+~~
+test
+~~
+.
+<p>~~test
+~~</p>
+<p>~~
+test~~</p>
+<p>~~
+test
+~~</p>
+.
+
+From CommonMark test suite, replacing `**` with our marker:
+
+.
+a~~"foo"~~
+.
+<p>a~~&quot;foo&quot;~~</p>
+.
+
+Coverage: single tilde
+.
+~a~
+.
+<p>~a~</p>
+.
+
+Regression test for #742:
+.
+-~~~~;~~~~~~
+.
+<p>-<s><s>;</s></s>~~</p>
+.
diff --git a/tests/test_port/fixtures/tables.md b/tests/test_port/fixtures/tables.md
new file mode 100644
index 0000000..cf83708
--- /dev/null
+++ b/tests/test_port/fixtures/tables.md
@@ -0,0 +1,896 @@
+Simple:
+.
+| Heading 1 | Heading 2
+| --------- | ---------
+| Cell 1    | Cell 2
+| Cell 3    | Cell 4
+.
+<table>
+<thead>
+<tr>
+<th>Heading 1</th>
+<th>Heading 2</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>Cell 1</td>
+<td>Cell 2</td>
+</tr>
+<tr>
+<td>Cell 3</td>
+<td>Cell 4</td>
+</tr>
+</tbody>
+</table>
+.
+
+
+Column alignment:
+.
+| Header 1 | Header 2 | Header 3 | Header 4 |
+| :------: | -------: | :------- | -------- |
+| Cell 1   | Cell 2   | Cell 3   | Cell 4   |
+| Cell 5   | Cell 6   | Cell 7   | Cell 8   |
+.
+<table>
+<thead>
+<tr>
+<th style="text-align:center">Header 1</th>
+<th style="text-align:right">Header 2</th>
+<th style="text-align:left">Header 3</th>
+<th>Header 4</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td style="text-align:center">Cell 1</td>
+<td style="text-align:right">Cell 2</td>
+<td style="text-align:left">Cell 3</td>
+<td>Cell 4</td>
+</tr>
+<tr>
+<td style="text-align:center">Cell 5</td>
+<td style="text-align:right">Cell 6</td>
+<td style="text-align:left">Cell 7</td>
+<td>Cell 8</td>
+</tr>
+</tbody>
+</table>
+.
+
+
+Nested emphases:
+.
+Header 1|Header 2|Header 3|Header 4
+:-------|:------:|-------:|--------
+Cell 1  |Cell 2  |Cell 3  |Cell 4
+*Cell 5*|Cell 6  |Cell 7  |Cell 8
+.
+<table>
+<thead>
+<tr>
+<th style="text-align:left">Header 1</th>
+<th style="text-align:center">Header 2</th>
+<th style="text-align:right">Header 3</th>
+<th>Header 4</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td style="text-align:left">Cell 1</td>
+<td style="text-align:center">Cell 2</td>
+<td style="text-align:right">Cell 3</td>
+<td>Cell 4</td>
+</tr>
+<tr>
+<td style="text-align:left"><em>Cell 5</em></td>
+<td style="text-align:center">Cell 6</td>
+<td style="text-align:right">Cell 7</td>
+<td>Cell 8</td>
+</tr>
+</tbody>
+</table>
+.
+
+
+Nested tables inside blockquotes:
+.
+> foo|foo
+> ---|---
+> bar|bar
+baz|baz
+.
+<blockquote>
+<table>
+<thead>
+<tr>
+<th>foo</th>
+<th>foo</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td>bar</td>
+</tr>
+</tbody>
+</table>
+</blockquote>
+<p>baz|baz</p>
+.
+
+
+Minimal one-column:
+.
+| foo
+|----
+| test2
+.
+<table>
+<thead>
+<tr>
+<th>foo</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>test2</td>
+</tr>
+</tbody>
+</table>
+.
+
+
+This is parsed as one big table:
+.
+-   foo|foo
+---|---
+bar|bar
+.
+<table>
+<thead>
+<tr>
+<th>-   foo</th>
+<th>foo</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td>bar</td>
+</tr>
+</tbody>
+</table>
+.
+
+
+Second line should not contain symbols except "-", ":", "|" and " ":
+.
+foo|foo
+-----|-----s
+bar|bar
+.
+<p>foo|foo
+-----|-----s
+bar|bar</p>
+.
+
+
+Second line should contain "|" symbol:
+.
+foo|foo
+-----:-----
+bar|bar
+.
+<p>foo|foo
+-----:-----
+bar|bar</p>
+.
+
+
+Second line should not have empty columns in the middle:
+.
+foo|foo
+-----||-----
+bar|bar
+.
+<p>foo|foo
+-----||-----
+bar|bar</p>
+.
+
+
+Wrong alignment symbol position:
+.
+foo|foo
+-----|-::-
+bar|bar
+.
+<p>foo|foo
+-----|-::-
+bar|bar</p>
+.
+
+
+Title line should contain "|" symbol:
+.
+foo
+-----|-----
+bar|bar
+.
+<p>foo
+-----|-----
+bar|bar</p>
+.
+
+
+Allow tabs as a separator on 2nd line
+.
+|	foo	|	bar	|
+|	---	|	---	|
+|	baz	|	quux	|
+.
+<table>
+<thead>
+<tr>
+<th>foo</th>
+<th>bar</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>baz</td>
+<td>quux</td>
+</tr>
+</tbody>
+</table>
+.
+
+
+Should terminate paragraph:
+.
+paragraph
+foo|foo
+---|---
+bar|bar
+.
+<p>paragraph</p>
+<table>
+<thead>
+<tr>
+<th>foo</th>
+<th>foo</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td>bar</td>
+</tr>
+</tbody>
+</table>
+.
+
+
+Table no longer terminated via row without "|" symbol:
+.
+foo|foo
+---|---
+paragraph
+.
+<table>
+<thead>
+<tr>
+<th>foo</th>
+<th>foo</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>paragraph</td>
+<td></td>
+</tr>
+</tbody>
+</table>
+.
+
+
+Delimiter escaping (deprecated):
+.
+| Heading 1 \\\\| Heading 2
+| --------- | ---------
+| Cell\|1\|| Cell\|2
+\| Cell\\\|3 \\| Cell\|4
+.
+<p>| Heading 1 \\| Heading 2
+| --------- | ---------
+| Cell|1|| Cell|2
+| Cell\|3 \| Cell|4</p>
+.
+
+Pipes inside backticks DO split cells, unless `\` escaped:
+.
+| Heading 1 | Heading 2
+| --------- | ---------
+| `Cell\|1` | Cell 2
+| `Cell|3` | Cell 4
+.
+<table>
+<thead>
+<tr>
+<th>Heading 1</th>
+<th>Heading 2</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td><code>Cell|1</code></td>
+<td>Cell 2</td>
+</tr>
+<tr>
+<td>`Cell</td>
+<td>3`</td>
+</tr>
+</tbody>
+</table>
+.
+
+Unclosed backticks don't count
+.
+| Heading 1 | Heading 2
+| --------- | ---------
+| Cell 1 | Cell 2
+| `Cell 3| Cell 4
+.
+<table>
+<thead>
+<tr>
+<th>Heading 1</th>
+<th>Heading 2</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>Cell 1</td>
+<td>Cell 2</td>
+</tr>
+<tr>
+<td>`Cell 3</td>
+<td>Cell 4</td>
+</tr>
+</tbody>
+</table>
+.
+
+Another complicated backticks case
+.
+| Heading 1 | Heading 2
+| --------- | ---------
+| Cell 1 | Cell 2
+| \\\`|\\\`
+.
+<table>
+<thead>
+<tr>
+<th>Heading 1</th>
+<th>Heading 2</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>Cell 1</td>
+<td>Cell 2</td>
+</tr>
+<tr>
+<td>\`</td>
+<td>\`</td>
+</tr>
+</tbody>
+</table>
+.
+
+`\` in tables should not count as escaped backtick
+.
+# | 1 | 2
+--|--|--
+x | `\` | `x`
+.
+<table>
+<thead>
+<tr>
+<th>#</th>
+<th>1</th>
+<th>2</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>x</td>
+<td><code>\</code></td>
+<td><code>x</code></td>
+</tr>
+</tbody>
+</table>
+.
+
+Tables should handle escaped backticks
+.
+# | 1 | 2
+--|--|--
+x | \`\` | `x`
+.
+<table>
+<thead>
+<tr>
+<th>#</th>
+<th>1</th>
+<th>2</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>x</td>
+<td>``</td>
+<td><code>x</code></td>
+</tr>
+</tbody>
+</table>
+.
+
+
+An amount of rows might be different across table (issue #171), but header and alignment rows must be equal (#697):
+.
+| 1 | 2 |
+| :-----: |  :-----: |
+| 3 | 4 | 5 | 6 |
+.
+<table>
+<thead>
+<tr>
+<th style="text-align:center">1</th>
+<th style="text-align:center">2</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td style="text-align:center">3</td>
+<td style="text-align:center">4</td>
+</tr>
+</tbody>
+</table>
+.
+
+
+An amount of rows might be different across the table #2:
+.
+| 1 | 2 | 3 | 4 |
+| :-----: |  :-----: |  :-----: |  :-----: |
+| 5 | 6 |
+.
+<table>
+<thead>
+<tr>
+<th style="text-align:center">1</th>
+<th style="text-align:center">2</th>
+<th style="text-align:center">3</th>
+<th style="text-align:center">4</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td style="text-align:center">5</td>
+<td style="text-align:center">6</td>
+<td style="text-align:center"></td>
+<td style="text-align:center"></td>
+</tr>
+</tbody>
+</table>
+.
+
+
+Allow one-column tables (issue #171):
+.
+| foo |
+:-----:
+| bar |
+.
+<table>
+<thead>
+<tr>
+<th style="text-align:center">foo</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td style="text-align:center">bar</td>
+</tr>
+</tbody>
+</table>
+.
+
+
+Allow indented tables (issue #325):
+.
+  | Col1a | Col2a |
+  | ----- | ----- |
+  | Col1b | Col2b |
+.
+<table>
+<thead>
+<tr>
+<th>Col1a</th>
+<th>Col2a</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>Col1b</td>
+<td>Col2b</td>
+</tr>
+</tbody>
+</table>
+.
+
+
+Tables should not be indented more than 4 spaces (1st line):
+.
+    | Col1a | Col2a |
+  | ----- | ----- |
+  | Col1b | Col2b |
+.
+<pre><code>| Col1a | Col2a |
+</code></pre>
+<p>| ----- | ----- |
+| Col1b | Col2b |</p>
+.
+
+
+Tables should not be indented more than 4 spaces (2nd line):
+.
+  | Col1a | Col2a |
+    | ----- | ----- |
+  | Col1b | Col2b |
+.
+<p>| Col1a | Col2a |
+| ----- | ----- |
+| Col1b | Col2b |</p>
+.
+
+
+Tables should not be indented more than 4 spaces (3rd line):
+.
+  | Col1a | Col2a |
+  | ----- | ----- |
+    | Col1b | Col2b |
+.
+<table>
+<thead>
+<tr>
+<th>Col1a</th>
+<th>Col2a</th>
+</tr>
+</thead>
+</table>
+<pre><code>| Col1b | Col2b |
+</code></pre>
+.
+
+
+Allow tables with empty body:
+.
+  | Col1a | Col2a |
+  | ----- | ----- |
+.
+<table>
+<thead>
+<tr>
+<th>Col1a</th>
+<th>Col2a</th>
+</tr>
+</thead>
+</table>
+.
+
+
+Align row should be at least as large as any actual rows:
+.
+Col1a | Col1b | Col1c
+----- | -----
+Col2a | Col2b | Col2c
+.
+<p>Col1a | Col1b | Col1c
+----- | -----
+Col2a | Col2b | Col2c</p>
+.
+
+Escaped pipes inside backticks don't split cells:
+.
+| Heading 1 | Heading 2
+| --------- | ---------
+| Cell 1 | Cell 2
+| `Cell 3\|` | Cell 4
+.
+<table>
+<thead>
+<tr>
+<th>Heading 1</th>
+<th>Heading 2</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>Cell 1</td>
+<td>Cell 2</td>
+</tr>
+<tr>
+<td><code>Cell 3|</code></td>
+<td>Cell 4</td>
+</tr>
+</tbody>
+</table>
+.
+
+Escape before escaped Pipes inside backticks don't split cells:
+.
+| Heading 1 | Heading 2
+| --------- | ---------
+| Cell 1 | Cell 2
+| `Cell 3\\|` | Cell 4
+.
+<table>
+<thead>
+<tr>
+<th>Heading 1</th>
+<th>Heading 2</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>Cell 1</td>
+<td>Cell 2</td>
+</tr>
+<tr>
+<td><code>Cell 3\|</code></td>
+<td>Cell 4</td>
+</tr>
+</tbody>
+</table>
+.
+
+Regression test for #721, table in a list indented with tabs:
+.
+- Level 1
+
+	- Level 2
+
+		| Column 1 | Column 2 |
+		| -------- | -------- |
+		| abcdefgh | ijklmnop |
+.
+<ul>
+<li>
+<p>Level 1</p>
+<ul>
+<li>
+<p>Level 2</p>
+<table>
+<thead>
+<tr>
+<th>Column 1</th>
+<th>Column 2</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>abcdefgh</td>
+<td>ijklmnop</td>
+</tr>
+</tbody>
+</table>
+</li>
+</ul>
+</li>
+</ul>
+.
+
+Table without any columns is not a table, #724
+.
+|
+|
+|
+.
+<p>|
+|
+|</p>
+.
+
+GFM 4.10 Tables (extension), Example 198
+.
+| foo | bar |
+| --- | --- |
+| baz | bim |
+.
+<table>
+<thead>
+<tr>
+<th>foo</th>
+<th>bar</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>baz</td>
+<td>bim</td>
+</tr>
+</tbody>
+</table>
+.
+
+GFM 4.10 Tables (extension), Example 199
+.
+| abc | defghi |
+:-: | -----------:
+bar | baz
+.
+<table>
+<thead>
+<tr>
+<th style="text-align:center">abc</th>
+<th style="text-align:right">defghi</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td style="text-align:center">bar</td>
+<td style="text-align:right">baz</td>
+</tr>
+</tbody>
+</table>
+.
+
+GFM 4.10 Tables (extension), Example 200
+.
+| f\|oo  |
+| ------ |
+| b `\|` az |
+| b **\|** im |
+.
+<table>
+<thead>
+<tr>
+<th>f|oo</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>b <code>|</code> az</td>
+</tr>
+<tr>
+<td>b <strong>|</strong> im</td>
+</tr>
+</tbody>
+</table>
+.
+
+GFM 4.10 Tables (extension), Example 201
+.
+| abc | def |
+| --- | --- |
+| bar | baz |
+> bar
+.
+<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td>baz</td>
+</tr>
+</tbody>
+</table>
+<blockquote>
+<p>bar</p>
+</blockquote>
+.
+
+GFM 4.10 Tables (extension), Example 202
+.
+| abc | def |
+| --- | --- |
+| bar | baz |
+bar
+
+bar
+.
+<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td>baz</td>
+</tr>
+<tr>
+<td>bar</td>
+<td></td>
+</tr>
+</tbody>
+</table>
+<p>bar</p>
+.
+
+GFM 4.10 Tables (extension), Example 203
+.
+| abc | def |
+| --- |
+| bar |
+.
+<p>| abc | def |
+| --- |
+| bar |</p>
+.
+
+GFM 4.10 Tables (extension), Example 204
+.
+| abc | def |
+| --- | --- |
+| bar |
+| bar | baz | boo |
+.
+<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td></td>
+</tr>
+<tr>
+<td>bar</td>
+<td>baz</td>
+</tr>
+</tbody>
+</table>
+.
+
+GFM 4.10 Tables (extension), Example 205
+.
+| abc | def |
+| --- | --- |
+.
+<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+</table>
+.
+
+A list takes precedence in case of ambiguity
+.
+a | b
+- | -
+1 | 2
+.
+<p>a | b</p>
+<ul>
+<li>| -
+1 | 2</li>
+</ul>
+.
diff --git a/tests/test_port/fixtures/typographer.md b/tests/test_port/fixtures/typographer.md
new file mode 100644
index 0000000..39154ed
--- /dev/null
+++ b/tests/test_port/fixtures/typographer.md
@@ -0,0 +1,115 @@
+.
+(bad)
+.
+<p>(bad)</p>
+.
+
+copyright (Lower)
+.
+(c)
+.
+<p>©</p>
+.
+
+copyright (Upper)
+.
+(C)
+.
+<p>©</p>
+.
+
+copyright
+.
+(c) (C)
+.
+<p>© ©</p>
+.
+
+
+reserved
+.
+(r) (R)
+.
+<p>® ®</p>
+.
+
+
+trademark
+.
+(tm) (TM)
+.
+<p>™ ™</p>
+.
+
+
+paragraph
+.
+(p) (P)
+.
+<p>§ §</p>
+.
+
+
+plus-minus
+.
++-5
+.
+<p>±5</p>
+.
+
+
+ellipsis
+.
+test.. test... test..... test?..... test!....
+.
+<p>test… test… test… test?.. test!..</p>
+.
+
+
+dupes
+.
+!!!!!! ???? ,,
+.
+<p>!!! ??? ,</p>
+.
+
+
+dupes-ellipsis
+.
+!... ?... ,... !!!!!!.... ????.... ,,...
+.
+<p>!.. ?.. ,… !!!.. ???.. ,…</p>
+.
+
+
+dashes
+.
+---markdownit --- super---
+
+markdownit---awesome
+
+abc ----
+
+--markdownit -- super--
+
+markdownit--awesome
+.
+<p>—markdownit — super—</p>
+<p>markdownit—awesome</p>
+<p>abc ----</p>
+<p>–markdownit – super–</p>
+<p>markdownit–awesome</p>
+.
+
+regression tests for #624
+.
+1---2---3
+
+1--2--3
+
+1 -- -- 3
+.
+<p>1—2—3</p>
+<p>1–2–3</p>
+<p>1 – – 3</p>
+.
diff --git a/tests/test_port/fixtures/xss.md b/tests/test_port/fixtures/xss.md
new file mode 100644
index 0000000..7c0512e
--- /dev/null
+++ b/tests/test_port/fixtures/xss.md
@@ -0,0 +1,128 @@
+.
+[normal link](javascript)
+.
+<p><a href="javascript">normal link</a></p>
+.
+
+
+Should not allow some protocols in links and images
+.
+[xss link](javascript:alert(1))
+
+[xss link](JAVASCRIPT:alert(1))
+
+[xss link](vbscript:alert(1))
+
+[xss link](VBSCRIPT:alert(1))
+
+[xss link](file:///123)
+.
+<p>[xss link](javascript:alert(1))</p>
+<p>[xss link](JAVASCRIPT:alert(1))</p>
+<p>[xss link](vbscript:alert(1))</p>
+<p>[xss link](VBSCRIPT:alert(1))</p>
+<p>[xss link](file:///123)</p>
+.
+
+
+.
+[xss link](&#34;&#62;&#60;script&#62;alert&#40;&#34;xss&#34;&#41;&#60;/script&#62;)
+
+[xss link](&#74;avascript:alert(1))
+
+[xss link](&#x26;#74;avascript:alert(1))
+
+[xss link](\&#74;avascript:alert(1))
+.
+<p><a href="%22%3E%3Cscript%3Ealert(%22xss%22)%3C/script%3E">xss link</a></p>
+<p>[xss link](Javascript:alert(1))</p>
+<p><a href="&amp;#74;avascript:alert(1)">xss link</a></p>
+<p><a href="&amp;#74;avascript:alert(1)">xss link</a></p>
+.
+
+.
+[xss link](<javascript:alert(1)>)
+.
+<p>[xss link](&lt;javascript:alert(1)&gt;)</p>
+.
+
+.
+[xss link](javascript&#x3A;alert(1))
+.
+<p>[xss link](javascript:alert(1))</p>
+.
+
+
+Should not allow data-uri except some whitelisted mimes
+.
+![](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
+.
+<p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" alt=""></p>
+.
+
+.
+[xss link](data:text/html;base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4K)
+.
+<p>[xss link](data:text/html;base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4K)</p>
+.
+
+.
+[normal link](/javascript:link)
+.
+<p><a href="/javascript:link">normal link</a></p>
+.
+
+
+Image parser use the same code base as link.
+.
+![xss link](javascript:alert(1))
+.
+<p>![xss link](javascript:alert(1))</p>
+.
+
+
+Autolinks
+.
+<javascript&#x3A;alert(1)>
+
+<javascript:alert(1)>
+.
+<p>&lt;javascript:alert(1)&gt;</p>
+<p>&lt;javascript:alert(1)&gt;</p>
+.
+
+
+Linkifier
+.
+javascript&#x3A;alert(1)
+
+javascript:alert(1)
+.
+<p>javascript:alert(1)</p>
+<p>javascript:alert(1)</p>
+.
+
+
+References
+.
+[test]: javascript:alert(1)
+.
+<p>[test]: javascript:alert(1)</p>
+.
+
+
+Make sure we decode entities before split:
+.
+```js&#32;custom-class
+test1
+```
+
+```js&#x0C;custom-class
+test2
+```
+.
+<pre><code class="js">test1
+</code></pre>
+<pre><code class="js">test2
+</code></pre>
+.
diff --git a/tests/test_port/test_fixtures.py b/tests/test_port/test_fixtures.py
new file mode 100644
index 0000000..5117c5e
--- /dev/null
+++ b/tests/test_port/test_fixtures.py
@@ -0,0 +1,114 @@
+from pathlib import Path
+
+import pytest
+
+from markdown_it import MarkdownIt
+from markdown_it.utils import read_fixture_file
+
+FIXTURE_PATH = Path(__file__).parent.joinpath("fixtures")
+
+
+@pytest.mark.parametrize(
+    "line,title,input,expected",
+    read_fixture_file(FIXTURE_PATH.joinpath("linkify.md")),
+)
+def test_linkify(line, title, input, expected):
+    md = MarkdownIt().enable("linkify")
+    md.options["linkify"] = True
+    text = md.render(input)
+    assert text.rstrip() == expected.rstrip()
+
+    # if not install linkify-it-py
+    md.linkify = None
+    with pytest.raises(ModuleNotFoundError):
+        md.render(input)
+
+
+@pytest.mark.parametrize(
+    "line,title,input,expected",
+    read_fixture_file(FIXTURE_PATH.joinpath("smartquotes.md")),
+)
+def test_smartquotes(line, title, input, expected):
+    md = MarkdownIt().enable("replacements").enable("smartquotes")
+    md.options["typographer"] = True
+    text = md.render(input)
+    assert text.rstrip() == expected.rstrip()
+
+
+@pytest.mark.parametrize(
+    "line,title,input,expected",
+    read_fixture_file(FIXTURE_PATH.joinpath("typographer.md")),
+)
+def test_typographer(line, title, input, expected):
+    md = MarkdownIt().enable("replacements")
+    md.options["typographer"] = True
+    text = md.render(input)
+    assert text.rstrip() == expected.rstrip()
+
+
+@pytest.mark.parametrize(
+    "line,title,input,expected", read_fixture_file(FIXTURE_PATH.joinpath("tables.md"))
+)
+def test_table(line, title, input, expected):
+    md = MarkdownIt().enable("table")
+    text = md.render(input)
+    try:
+        assert text.rstrip() == expected.rstrip()
+    except AssertionError:
+        print(text)
+        raise
+
+
+@pytest.mark.parametrize(
+    "line,title,input,expected",
+    read_fixture_file(FIXTURE_PATH.joinpath("commonmark_extras.md")),
+)
+def test_commonmark_extras(line, title, input, expected):
+    md = MarkdownIt("commonmark")
+    md.options["langPrefix"] = ""
+    text = md.render(input)
+    if text.rstrip() != expected.rstrip():
+        print(text)
+    assert text.rstrip() == expected.rstrip()
+
+
+@pytest.mark.parametrize(
+    "line,title,input,expected",
+    read_fixture_file(FIXTURE_PATH.joinpath("normalize.md")),
+)
+def test_normalize_url(line, title, input, expected):
+    md = MarkdownIt("commonmark")
+    text = md.render(input)
+    assert text.rstrip() == expected.rstrip()
+
+
+@pytest.mark.parametrize(
+    "line,title,input,expected", read_fixture_file(FIXTURE_PATH.joinpath("fatal.md"))
+)
+def test_fatal(line, title, input, expected):
+    md = MarkdownIt("commonmark").enable("replacements")
+    md.options["typographer"] = True
+    text = md.render(input)
+    if text.rstrip() != expected.rstrip():
+        print(text)
+    assert text.rstrip() == expected.rstrip()
+
+
+@pytest.mark.parametrize(
+    "line,title,input,expected",
+    read_fixture_file(FIXTURE_PATH.joinpath("strikethrough.md")),
+)
+def test_strikethrough(line, title, input, expected):
+    md = MarkdownIt().enable("strikethrough")
+    text = md.render(input)
+    assert text.rstrip() == expected.rstrip()
+
+
+@pytest.mark.parametrize(
+    "line,title,input,expected",
+    read_fixture_file(FIXTURE_PATH.joinpath("issue-fixes.md")),
+)
+def test_issue_fixes(line, title, input, expected):
+    md = MarkdownIt()
+    text = md.render(input)
+    assert text.rstrip() == expected.rstrip()
diff --git a/tests/test_port/test_misc.py b/tests/test_port/test_misc.py
new file mode 100644
index 0000000..62b5bf8
--- /dev/null
+++ b/tests/test_port/test_misc.py
@@ -0,0 +1,44 @@
+from markdown_it import MarkdownIt, presets
+
+
+def test_highlight_arguments():
+    def highlight_func(str_, lang, attrs):
+        assert lang == "a"
+        assert attrs == "b  c  d"
+        return "<pre><code>==" + str_ + "==</code></pre>"
+
+    conf = presets.commonmark.make()
+    conf["options"]["highlight"] = highlight_func
+    md = MarkdownIt(config=conf)
+    assert md.render("``` a  b  c  d \nhl\n```") == "<pre><code>==hl\n==</code></pre>\n"
+
+
+def test_ordered_list_info():
+    def type_filter(tokens, type_):
+        return [t for t in tokens if t.type == type_]
+
+    md = MarkdownIt()
+
+    tokens = md.parse("1. Foo\n2. Bar\n20. Fuzz")
+    assert len(type_filter(tokens, "ordered_list_open")) == 1
+    tokens = type_filter(tokens, "list_item_open")
+    assert len(tokens) == 3
+    assert tokens[0].info == "1"
+    assert tokens[0].markup == "."
+    assert tokens[1].info == "2"
+    assert tokens[1].markup == "."
+    assert tokens[2].info == "20"
+    assert tokens[2].markup == "."
+
+    tokens = md.parse(" 1. Foo\n2. Bar\n  20. Fuzz\n 199. Flp")
+    assert len(type_filter(tokens, "ordered_list_open")) == 1
+    tokens = type_filter(tokens, "list_item_open")
+    assert len(tokens) == 4
+    assert tokens[0].info == "1"
+    assert tokens[0].markup == "."
+    assert tokens[1].info == "2"
+    assert tokens[1].markup == "."
+    assert tokens[2].info == "20"
+    assert tokens[2].markup == "."
+    assert tokens[3].info == "199"
+    assert tokens[3].markup == "."
diff --git a/tests/test_port/test_no_end_newline.py b/tests/test_port/test_no_end_newline.py
new file mode 100644
index 0000000..5e7cf82
--- /dev/null
+++ b/tests/test_port/test_no_end_newline.py
@@ -0,0 +1,27 @@
+import pytest
+
+from markdown_it import MarkdownIt
+
+
+@pytest.mark.parametrize(
+    "input,expected",
+    [
+        ("#", "<h1></h1>\n"),
+        ("###", "<h3></h3>\n"),
+        ("` `", "<p><code> </code></p>\n"),
+        ("``````", "<pre><code></code></pre>\n"),
+        ("-", "<ul>\n<li></li>\n</ul>\n"),
+        ("1.", "<ol>\n<li></li>\n</ol>\n"),
+        (">", "<blockquote></blockquote>\n"),
+        ("---", "<hr />\n"),
+        ("<h1></h1>", "<h1></h1>"),
+        ("p", "<p>p</p>\n"),
+        ("[reference]: /url", ""),
+        ("    indented code block", "<pre><code>indented code block\n</code></pre>\n"),
+        ("> test\n>", "<blockquote>\n<p>test</p>\n</blockquote>\n"),
+    ],
+)
+def test_no_end_newline(input, expected):
+    md = MarkdownIt()
+    text = md.render(input)
+    assert text == expected
diff --git a/tests/test_port/test_references.py b/tests/test_port/test_references.py
new file mode 100644
index 0000000..32e389d
--- /dev/null
+++ b/tests/test_port/test_references.py
@@ -0,0 +1,53 @@
+from markdown_it import MarkdownIt
+
+
+def test_ref_definitions():
+
+    md = MarkdownIt()
+    src = "[a]: abc\n\n[b]: xyz\n\n[b]: ijk"
+    env = {}
+    tokens = md.parse(src, env)
+    assert tokens == []
+    assert env == {
+        "references": {
+            "A": {"title": "", "href": "abc", "map": [0, 1]},
+            "B": {"title": "", "href": "xyz", "map": [2, 3]},
+        },
+        "duplicate_refs": [{"href": "ijk", "label": "B", "map": [4, 5], "title": ""}],
+    }
+
+
+def test_use_existing_env(data_regression):
+    md = MarkdownIt()
+    src = "[a]\n\n[c]: ijk"
+    env = {
+        "references": {
+            "A": {"title": "", "href": "abc", "map": [0, 1]},
+            "B": {"title": "", "href": "xyz", "map": [2, 3]},
+        }
+    }
+    tokens = md.parse(src, env)
+    data_regression.check([token.as_dict() for token in tokens])
+    assert env == {
+        "references": {
+            "A": {"title": "", "href": "abc", "map": [0, 1]},
+            "B": {"title": "", "href": "xyz", "map": [2, 3]},
+            "C": {"title": "", "href": "ijk", "map": [2, 3]},
+        }
+    }
+
+
+def test_store_labels(data_regression):
+    md = MarkdownIt()
+    md.options["store_labels"] = True
+    src = "[a]\n\n![a]\n\n[a]: ijk"
+    tokens = md.parse(src)
+    data_regression.check([token.as_dict() for token in tokens])
+
+
+def test_inline_definitions(data_regression):
+    md = MarkdownIt()
+    md.options["inline_definitions"] = True
+    src = '[a]: url "title"\n- [a]: url "title"'
+    tokens = md.parse(src)
+    data_regression.check([token.as_dict() for token in tokens])
diff --git a/tests/test_port/test_references/test_inline_definitions.yml b/tests/test_port/test_references/test_inline_definitions.yml
new file mode 100644
index 0000000..5ec210b
--- /dev/null
+++ b/tests/test_port/test_references/test_inline_definitions.yml
@@ -0,0 +1,94 @@
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 0
+  map:
+  - 0
+  - 1
+  markup: ''
+  meta:
+    id: A
+    label: a
+    title: title
+    url: url
+  nesting: 0
+  tag: ''
+  type: definition
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 0
+  map:
+  - 1
+  - 2
+  markup: '-'
+  meta: {}
+  nesting: 1
+  tag: ul
+  type: bullet_list_open
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 1
+  map:
+  - 1
+  - 2
+  markup: '-'
+  meta: {}
+  nesting: 1
+  tag: li
+  type: list_item_open
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 2
+  map:
+  - 1
+  - 2
+  markup: ''
+  meta:
+    id: A
+    label: a
+    title: title
+    url: url
+  nesting: 0
+  tag: ''
+  type: definition
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 1
+  map: null
+  markup: '-'
+  meta: {}
+  nesting: -1
+  tag: li
+  type: list_item_close
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 0
+  map: null
+  markup: '-'
+  meta: {}
+  nesting: -1
+  tag: ul
+  type: bullet_list_close
diff --git a/tests/test_port/test_references/test_store_labels.yml b/tests/test_port/test_references/test_store_labels.yml
new file mode 100644
index 0000000..79f6f74
--- /dev/null
+++ b/tests/test_port/test_references/test_store_labels.yml
@@ -0,0 +1,159 @@
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 0
+  map:
+  - 0
+  - 1
+  markup: ''
+  meta: {}
+  nesting: 1
+  tag: p
+  type: paragraph_open
+- attrs: null
+  block: true
+  children:
+  - attrs:
+    - - href
+      - ijk
+    block: false
+    children: null
+    content: ''
+    hidden: false
+    info: ''
+    level: 0
+    map: null
+    markup: ''
+    meta:
+      label: A
+    nesting: 1
+    tag: a
+    type: link_open
+  - attrs: null
+    block: false
+    children: null
+    content: a
+    hidden: false
+    info: ''
+    level: 1
+    map: null
+    markup: ''
+    meta: {}
+    nesting: 0
+    tag: ''
+    type: text
+  - attrs: null
+    block: false
+    children: null
+    content: ''
+    hidden: false
+    info: ''
+    level: 0
+    map: null
+    markup: ''
+    meta: {}
+    nesting: -1
+    tag: a
+    type: link_close
+  content: '[a]'
+  hidden: false
+  info: ''
+  level: 1
+  map:
+  - 0
+  - 1
+  markup: ''
+  meta: {}
+  nesting: 0
+  tag: ''
+  type: inline
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 0
+  map: null
+  markup: ''
+  meta: {}
+  nesting: -1
+  tag: p
+  type: paragraph_close
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 0
+  map:
+  - 2
+  - 3
+  markup: ''
+  meta: {}
+  nesting: 1
+  tag: p
+  type: paragraph_open
+- attrs: null
+  block: true
+  children:
+  - attrs:
+    - - src
+      - ijk
+    - - alt
+      - ''
+    block: false
+    children:
+    - attrs: null
+      block: false
+      children: null
+      content: a
+      hidden: false
+      info: ''
+      level: 0
+      map: null
+      markup: ''
+      meta: {}
+      nesting: 0
+      tag: ''
+      type: text
+    content: a
+    hidden: false
+    info: ''
+    level: 0
+    map: null
+    markup: ''
+    meta:
+      label: A
+    nesting: 0
+    tag: img
+    type: image
+  content: '![a]'
+  hidden: false
+  info: ''
+  level: 1
+  map:
+  - 2
+  - 3
+  markup: ''
+  meta: {}
+  nesting: 0
+  tag: ''
+  type: inline
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 0
+  map: null
+  markup: ''
+  meta: {}
+  nesting: -1
+  tag: p
+  type: paragraph_close
diff --git a/tests/test_port/test_references/test_use_existing_env.yml b/tests/test_port/test_references/test_use_existing_env.yml
new file mode 100644
index 0000000..1a72337
--- /dev/null
+++ b/tests/test_port/test_references/test_use_existing_env.yml
@@ -0,0 +1,84 @@
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 0
+  map:
+  - 0
+  - 1
+  markup: ''
+  meta: {}
+  nesting: 1
+  tag: p
+  type: paragraph_open
+- attrs: null
+  block: true
+  children:
+  - attrs:
+    - - href
+      - abc
+    block: false
+    children: null
+    content: ''
+    hidden: false
+    info: ''
+    level: 0
+    map: null
+    markup: ''
+    meta: {}
+    nesting: 1
+    tag: a
+    type: link_open
+  - attrs: null
+    block: false
+    children: null
+    content: a
+    hidden: false
+    info: ''
+    level: 1
+    map: null
+    markup: ''
+    meta: {}
+    nesting: 0
+    tag: ''
+    type: text
+  - attrs: null
+    block: false
+    children: null
+    content: ''
+    hidden: false
+    info: ''
+    level: 0
+    map: null
+    markup: ''
+    meta: {}
+    nesting: -1
+    tag: a
+    type: link_close
+  content: '[a]'
+  hidden: false
+  info: ''
+  level: 1
+  map:
+  - 0
+  - 1
+  markup: ''
+  meta: {}
+  nesting: 0
+  tag: ''
+  type: inline
+- attrs: null
+  block: true
+  children: null
+  content: ''
+  hidden: false
+  info: ''
+  level: 0
+  map: null
+  markup: ''
+  meta: {}
+  nesting: -1
+  tag: p
+  type: paragraph_close
diff --git a/tests/test_tree.py b/tests/test_tree.py
new file mode 100644
index 0000000..7a7d605
--- /dev/null
+++ b/tests/test_tree.py
@@ -0,0 +1,93 @@
+from markdown_it import MarkdownIt
+from markdown_it.tree import SyntaxTreeNode
+
+EXAMPLE_MARKDOWN = """
+## Heading here
+
+Some paragraph text and **emphasis here** and more text here.
+"""
+
+
+def test_tree_to_tokens_conversion():
+    tokens = MarkdownIt().parse(EXAMPLE_MARKDOWN)
+    tokens_after_roundtrip = SyntaxTreeNode(tokens).to_tokens()
+    assert tokens == tokens_after_roundtrip
+
+
+def test_property_passthrough():
+    tokens = MarkdownIt().parse(EXAMPLE_MARKDOWN)
+    heading_open = tokens[0]
+    tree = SyntaxTreeNode(tokens)
+    heading_node = tree.children[0]
+    assert heading_open.tag == heading_node.tag
+    assert tuple(heading_open.map) == heading_node.map
+    assert heading_open.level == heading_node.level
+    assert heading_open.content == heading_node.content
+    assert heading_open.markup == heading_node.markup
+    assert heading_open.info == heading_node.info
+    assert heading_open.meta == heading_node.meta
+    assert heading_open.block == heading_node.block
+    assert heading_open.hidden == heading_node.hidden
+
+
+def test_type():
+    tokens = MarkdownIt().parse(EXAMPLE_MARKDOWN)
+    tree = SyntaxTreeNode(tokens)
+    # Root type is "root"
+    assert tree.type == "root"
+    # "_open" suffix must be stripped from nested token type
+    assert tree.children[0].type == "heading"
+    assert tree[0].type == "heading"
+    # For unnested tokens, node type must remain same as token type
+    assert tree.children[0].children[0].type == "inline"
+
+
+def test_sibling_traverse():
+    tokens = MarkdownIt().parse(EXAMPLE_MARKDOWN)
+    tree = SyntaxTreeNode(tokens)
+    paragraph_inline_node = tree.children[1].children[0]
+    text_node = paragraph_inline_node.children[0]
+    assert text_node.type == "text"
+    strong_node = text_node.next_sibling
+    assert strong_node.type == "strong"
+    another_text_node = strong_node.next_sibling
+    assert another_text_node.type == "text"
+    assert another_text_node.next_sibling is None
+    assert another_text_node.previous_sibling.previous_sibling == text_node
+    assert text_node.previous_sibling is None
+
+
+def test_pretty(file_regression):
+    md = MarkdownIt("commonmark")
+    tokens = md.parse(
+        """
+# Header
+
+Here's some text and an image ![title](image.png)
+
+1. a **list**
+
+> a *quote*
+    """
+    )
+    node = SyntaxTreeNode(tokens)
+    file_regression.check(node.pretty(indent=2, show_text=True), extension=".xml")
+
+
+def test_walk():
+    tokens = MarkdownIt().parse(EXAMPLE_MARKDOWN)
+    tree = SyntaxTreeNode(tokens)
+    expected_node_types = (
+        "root",
+        "heading",
+        "inline",
+        "text",
+        "paragraph",
+        "inline",
+        "text",
+        "strong",
+        "text",
+        "text",
+    )
+    for node, expected_type in zip(tree.walk(), expected_node_types):
+        assert node.type == expected_type
diff --git a/tests/test_tree/test_pretty.xml b/tests/test_tree/test_pretty.xml
new file mode 100644
index 0000000..41d399e
--- /dev/null
+++ b/tests/test_tree/test_pretty.xml
@@ -0,0 +1,30 @@
+<root>
+  <heading>
+    <inline>
+      <text>
+        Header
+  <paragraph>
+    <inline>
+      <text>
+        Here's some text and an image 
+      <image src='image.png' alt=''>
+        <text>
+          title
+  <ordered_list>
+    <list_item>
+      <paragraph>
+        <inline>
+          <text>
+            a 
+          <strong>
+            <text>
+              list
+          <text>
+  <blockquote>
+    <paragraph>
+      <inline>
+        <text>
+          a 
+        <em>
+          <text>
+            quote
\ No newline at end of file