Merging upstream version 127.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
author: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-06-12 05:43:14 +0000
committer: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-06-12 05:43:14 +0000
commit: 8dd16259287f58f9273002717ec4d27e97127719 (patch)
tree: 3863e62a53829a84037444beab3abd4ed9dfc7d0 /testing/web-platform/tests/dom
parent: Releasing progress-linux version 126.0.1-1~progress7.99u1. (diff)
download: firefox-8dd16259287f58f9273002717ec4d27e97127719.tar.xz
firefox-8dd16259287f58f9273002717ec4d27e97127719.zip
24 files changed, 1929 insertions, 22 deletions
diff --git a/testing/web-platform/tests/dom/events/scrolling/WEB_FEATURES.yml b/testing/web-platform/tests/dom/events/scrolling/WEB_FEATURES.yml
new file mode 100644
index 0000000000..e4fba841b6
--- /dev/null
+++ b/testing/web-platform/tests/dom/events/scrolling/WEB_FEATURES.yml
@@ -0,0 +1,4 @@
+features:
+- name: scrollend
+  files:
+  - scrollend-*
diff --git a/testing/web-platform/tests/dom/nodes/insertion-removing-steps/Node-append-meta-referrer-and-script-from-fragment.tentative.html b/testing/web-platform/tests/dom/nodes/insertion-removing-steps/Node-append-meta-referrer-and-script-from-fragment.tentative.html
index d247797603..e80e3b45b6 100644
--- a/testing/web-platform/tests/dom/nodes/insertion-removing-steps/Node-append-meta-referrer-and-script-from-fragment.tentative.html
+++ b/testing/web-platform/tests/dom/nodes/insertion-removing-steps/Node-append-meta-referrer-and-script-from-fragment.tentative.html
@@ -5,25 +5,37 @@
 <script src=/resources/testharnessreport.js></script>
 <script>
 promise_test(async t => {
-    const script = document.createElement("script");
-    const meta = document.createElement("meta");
-    meta.name = "referrer";
-    meta.content = "no-referrer";
-    const fragment = new DocumentFragment();
-    const done = new Promise(resolve => {
-        window.didFetch = resolve;
-    });
-    script.textContent = `
-        (async function() {
-            const response = await fetch("/html/infrastructure/urls/terminology-0/resources/echo-referrer-text.py")
-            const text = await response.text();
-            window.didFetch(text);
-        })();
-    `;
-    fragment.append(script, meta);
-    document.head.append(fragment);
-    const result = await done;
-    assert_equals(result, "");
-}, "<meta name=referrer> should apply before script, as it is an insertion step " +
-    "and not a post-insertion step");
+  const preMetaScript = document.createElement("script");
+  preMetaScript.textContent = `
+    window.preMetaScriptPromise = fetch('/html/infrastructure/urls/terminology-0/resources/echo-referrer-text.py')
+      .then(response => response.text());
+  `;
+
+  const meta = document.createElement("meta");
+  meta.name = "referrer";
+  meta.content = "no-referrer";
+
+  const postMetaScript = document.createElement("script");
+  postMetaScript.textContent = `
+    window.postMetaScriptPromise = fetch('/html/infrastructure/urls/terminology-0/resources/echo-referrer-text.py')
+      .then(response => response.text());
+  `;
+
+  const fragment = new DocumentFragment();
+  fragment.append(preMetaScript, meta, postMetaScript);
+  document.head.append(fragment);
+
+  const preMetaReferrer = await window.preMetaScriptPromise;
+  assert_equals(preMetaReferrer, location.href,
+      "preMetaReferrer is the full URL; by the time the first script runs in " +
+      "its post-insertion steps, the later-inserted meta tag has not run its " +
+      "post-insertion steps, which is where meta tags are processed");
+
+  const postMetaReferrer = await window.postMetaScriptPromise;
+  assert_equals(postMetaReferrer, "",
+      "postMetaReferrer is empty; by the time the second script runs in " +
+      "its post-insertion steps, the later-inserted meta tag has run its " +
+      "post-insertion steps, and observes the meta tag's effect");
+}, "<meta name=referrer> gets processed and applied in the post-insertion " +
+   "steps");
 </script>
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/Node-moveBefore.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/Node-moveBefore.html
new file mode 100644
index 0000000000..8a1db6f93b
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/Node-moveBefore.html
@@ -0,0 +1,297 @@
+<!DOCTYPE html>
+<title>Node.moveBefore</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<!-- First test shared pre-insertion checks that work similarly for replaceChild
+     and moveBefore -->
+<script>
+  var insertFunc = Node.prototype.moveBefore;
+</script>
+<script src="../../pre-insertion-validation-notfound.js"></script>
+<script src="../../pre-insertion-validation-hierarchy.js"></script>
+<script>
+preInsertionValidateHierarchy("moveBefore");
+
+function testLeafNode(nodeName, createNodeFunction) {
+  test(function() {
+    var node = createNodeFunction();
+    assert_throws_js(TypeError, function() { node.moveBefore(null, null) })
+  }, "Calling moveBefore with a non-Node first argument on a leaf node " + nodeName + " must throw TypeError.")
+  test(function() {
+    var node = createNodeFunction();
+    assert_throws_dom("HIERARCHY_REQUEST_ERR", function() { node.moveBefore(document.createTextNode("fail"), null) })
+    // Would be step 2.
+    assert_throws_dom("HIERARCHY_REQUEST_ERR", function() { node.moveBefore(node, null) })
+    // Would be step 3.
+    assert_throws_dom("HIERARCHY_REQUEST_ERR", function() { node.moveBefore(node, document.createTextNode("child")) })
+  }, "Calling moveBefore an a leaf node " + nodeName + " must throw HIERARCHY_REQUEST_ERR.")
+}
+
+test(function() {
+  // WebIDL: first argument.
+  assert_throws_js(TypeError, function() { document.body.moveBefore(null, null) })
+  assert_throws_js(TypeError, function() { document.body.moveBefore(null, document.body.firstChild) })
+  assert_throws_js(TypeError, function() { document.body.moveBefore({'a':'b'}, document.body.firstChild) })
+}, "Calling moveBefore with a non-Node first argument must throw TypeError.")
+
+test(function() {
+  // WebIDL: second argument.
+  assert_throws_js(TypeError, function() { document.body.moveBefore(document.createTextNode("child")) })
+  assert_throws_js(TypeError, function() { document.body.moveBefore(document.createTextNode("child"), {'a':'b'}) })
+}, "Calling moveBefore with second argument missing, or other than Node, null, or undefined, must throw TypeError.")
+
+testLeafNode("DocumentType", function () { return document.doctype; } )
+testLeafNode("Text", function () { return document.createTextNode("Foo") })
+testLeafNode("Comment", function () { return document.createComment("Foo") })
+testLeafNode("ProcessingInstruction", function () { return document.createProcessingInstruction("foo", "bar") })
+
+test(function() {
+  // Step 2.
+  assert_throws_dom("HIERARCHY_REQUEST_ERR", function() { document.body.moveBefore(document.body, document.getElementById("log")) })
+  assert_throws_dom("HIERARCHY_REQUEST_ERR", function() { document.body.moveBefore(document.documentElement, document.getElementById("log")) })
+}, "Calling moveBefore with an inclusive ancestor of the context object must throw HIERARCHY_REQUEST_ERR.")
+
+// Step 3.
+test(function() {
+  var a = document.createElement("div");
+  var b = document.createElement("div");
+  var c = document.createElement("div");
+  assert_throws_dom("NotFoundError", function() {
+    a.moveBefore(b, c);
+  });
+}, "Calling moveBefore with a reference child whose parent is not the context node must throw a NotFoundError.")
+
+// Step 4.1.
+test(function() {
+  var doc = document.implementation.createHTMLDocument("title");
+  var doc2 = document.implementation.createHTMLDocument("title2");
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(doc2, doc.documentElement);
+  });
+
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(doc.createTextNode("text"), doc.documentElement);
+  });
+}, "If the context node is a document, inserting a document or text node should throw a HierarchyRequestError.")
+
+// Step 4.2.1.
+test(function() {
+  var doc = document.implementation.createHTMLDocument("title");
+  doc.removeChild(doc.documentElement);
+
+  var df = doc.createDocumentFragment();
+  df.appendChild(doc.createElement("a"));
+  df.appendChild(doc.createElement("b"));
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(df, doc.firstChild);
+  });
+
+  df = doc.createDocumentFragment();
+  df.appendChild(doc.createTextNode("text"));
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(df, doc.firstChild);
+  });
+
+  df = doc.createDocumentFragment();
+  df.appendChild(doc.createComment("comment"));
+  df.appendChild(doc.createTextNode("text"));
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(df, doc.firstChild);
+  });
+}, "If the context node is a document, inserting a DocumentFragment that contains a text node or too many elements should throw a HierarchyRequestError.")
+
+// Step 4.2.2.
+test(function() {
+  // The context node has an element child.
+  var doc = document.implementation.createHTMLDocument("title");
+  var comment = doc.appendChild(doc.createComment("foo"));
+  assert_array_equals(doc.childNodes, [doc.doctype, doc.documentElement, comment]);
+
+  var df = doc.createDocumentFragment();
+  df.appendChild(doc.createElement("a"));
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(df, doc.doctype);
+  });
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(df, doc.documentElement);
+  });
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(df, comment);
+  });
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(df, null);
+  });
+}, "If the context node is a document, inserting a DocumentFragment with an element if there already is an element child should throw a HierarchyRequestError.")
+test(function() {
+  // /child/ is a doctype.
+  var doc = document.implementation.createHTMLDocument("title");
+  var comment = doc.moveBefore(doc.createComment("foo"), doc.firstChild);
+  doc.removeChild(doc.documentElement);
+  assert_array_equals(doc.childNodes, [comment, doc.doctype]);
+
+  var df = doc.createDocumentFragment();
+  df.appendChild(doc.createElement("a"));
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(df, doc.doctype);
+  });
+}, "If the context node is a document and a doctype is following the reference child, inserting a DocumentFragment with an element should throw a HierarchyRequestError.")
+test(function() {
+  // /child/ is not null and a doctype is following /child/.
+  var doc = document.implementation.createHTMLDocument("title");
+  var comment = doc.moveBefore(doc.createComment("foo"), doc.firstChild);
+  doc.removeChild(doc.documentElement);
+  assert_array_equals(doc.childNodes, [comment, doc.doctype]);
+
+  var df = doc.createDocumentFragment();
+  df.appendChild(doc.createElement("a"));
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(df, comment);
+  });
+}, "If the context node is a document, inserting a DocumentFragment with an element before the doctype should throw a HierarchyRequestError.")
+
+// Step 4.3.
+test(function() {
+  // The context node has an element child.
+  var doc = document.implementation.createHTMLDocument("title");
+  var comment = doc.appendChild(doc.createComment("foo"));
+  assert_array_equals(doc.childNodes, [doc.doctype, doc.documentElement, comment]);
+
+  var a = doc.createElement("a");
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(a, doc.doctype);
+  });
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(a, doc.documentElement);
+  });
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(a, comment);
+  });
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(a, null);
+  });
+}, "If the context node is a document, inserting an element if there already is an element child should throw a HierarchyRequestError.")
+test(function() {
+  // /child/ is a doctype.
+  var doc = document.implementation.createHTMLDocument("title");
+  var comment = doc.moveBefore(doc.createComment("foo"), doc.firstChild);
+  doc.removeChild(doc.documentElement);
+  assert_array_equals(doc.childNodes, [comment, doc.doctype]);
+
+  var a = doc.createElement("a");
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(a, doc.doctype);
+  });
+}, "If the context node is a document, inserting an element before the doctype should throw a HierarchyRequestError.")
+test(function() {
+  // /child/ is not null and a doctype is following /child/.
+  var doc = document.implementation.createHTMLDocument("title");
+  var comment = doc.moveBefore(doc.createComment("foo"), doc.firstChild);
+  doc.removeChild(doc.documentElement);
+  assert_array_equals(doc.childNodes, [comment, doc.doctype]);
+
+  var a = doc.createElement("a");
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(a, comment);
+  });
+}, "If the context node is a document and a doctype is following the reference child, inserting an element should throw a HierarchyRequestError.")
+
+// Step 4.4.
+test(function() {
+  var doc = document.implementation.createHTMLDocument("title");
+  var comment = doc.moveBefore(doc.createComment("foo"), doc.firstChild);
+  assert_array_equals(doc.childNodes, [comment, doc.doctype, doc.documentElement]);
+
+  var doctype = document.implementation.createDocumentType("html", "", "");
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(doctype, comment);
+  });
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(doctype, doc.doctype);
+  });
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(doctype, doc.documentElement);
+  });
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(doctype, null);
+  });
+}, "If the context node is a document, inserting a doctype if there already is a doctype child should throw a HierarchyRequestError.")
+test(function() {
+  var doc = document.implementation.createHTMLDocument("title");
+  var comment = doc.appendChild(doc.createComment("foo"));
+  doc.removeChild(doc.doctype);
+  assert_array_equals(doc.childNodes, [doc.documentElement, comment]);
+
+  var doctype = document.implementation.createDocumentType("html", "", "");
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(doctype, comment);
+  });
+}, "If the context node is a document, inserting a doctype after the document element should throw a HierarchyRequestError.")
+test(function() {
+  var doc = document.implementation.createHTMLDocument("title");
+  var comment = doc.appendChild(doc.createComment("foo"));
+  doc.removeChild(doc.doctype);
+  assert_array_equals(doc.childNodes, [doc.documentElement, comment]);
+
+  var doctype = document.implementation.createDocumentType("html", "", "");
+  assert_throws_dom("HierarchyRequestError", function() {
+    doc.moveBefore(doctype, null);
+  });
+}, "If the context node is a document with and element child, appending a doctype should throw a HierarchyRequestError.")
+
+// Step 5.
+test(function() {
+  var df = document.createDocumentFragment();
+  var a = df.appendChild(document.createElement("a"));
+
+  var doc = document.implementation.createHTMLDocument("title");
+  assert_throws_dom("HierarchyRequestError", function() {
+    df.moveBefore(doc, a);
+  });
+  assert_throws_dom("HierarchyRequestError", function() {
+    df.moveBefore(doc, null);
+  });
+
+  var doctype = document.implementation.createDocumentType("html", "", "");
+  assert_throws_dom("HierarchyRequestError", function() {
+    df.moveBefore(doctype, a);
+  });
+  assert_throws_dom("HierarchyRequestError", function() {
+    df.moveBefore(doctype, null);
+  });
+}, "If the context node is a DocumentFragment, inserting a document or a doctype should throw a HierarchyRequestError.")
+test(function() {
+  var el = document.createElement("div");
+  var a = el.appendChild(document.createElement("a"));
+
+  var doc = document.implementation.createHTMLDocument("title");
+  assert_throws_dom("HierarchyRequestError", function() {
+    el.moveBefore(doc, a);
+  });
+  assert_throws_dom("HierarchyRequestError", function() {
+    el.moveBefore(doc, null);
+  });
+
+  var doctype = document.implementation.createDocumentType("html", "", "");
+  assert_throws_dom("HierarchyRequestError", function() {
+    el.moveBefore(doctype, a);
+  });
+  assert_throws_dom("HierarchyRequestError", function() {
+    el.moveBefore(doctype, null);
+  });
+}, "If the context node is an element, inserting a document or a doctype should throw a HierarchyRequestError.")
+
+// Step 7.
+test(function() {
+  var a = document.createElement("div");
+  var b = document.createElement("div");
+  var c = document.createElement("div");
+  a.appendChild(b);
+  a.appendChild(c);
+  assert_array_equals(a.childNodes, [b, c]);
+  assert_equals(a.moveBefore(b, b), b);
+  assert_array_equals(a.childNodes, [b, c]);
+  assert_equals(a.moveBefore(c, c), c);
+  assert_array_equals(a.childNodes, [b, c]);
+}, "Inserting a node before itself should not move the node");
+</script>
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/chrome-338071841-crash.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/chrome-338071841-crash.html
new file mode 100644
index 0000000000..26adfb1cbf
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/chrome-338071841-crash.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<link rel="help" href="https://crbug.com/338071841">
+<div id="p"><span></span><!-- comment --></div>
+<script>
+  p.moveBefore(p.lastChild, p.firstChild);
+</script>
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-animation-left.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-animation-left.html
new file mode 100644
index 0000000000..8c7f73e3c9
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-animation-left.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<title>Node.moveBefore should preserve CSS animation state (left)</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+  <section id="old-parent">
+    <div id="item"></div>
+  </section>
+  <section id="new-parent">
+  </section>
+  <style>
+    @keyframes anim {
+      from {
+        left: 100px;
+      }
+
+      to {
+        left: 400px;
+      }
+    }
+
+    section {
+      position: absolute;
+    }
+
+    #item {
+      position: relative;
+      width: 100px;
+      height: 100px;
+      background: green;
+      animation: 1s linear infinite alternate anim;
+      animation-delay: 100ms;
+    }
+  </style>
+  <script>
+    promise_test(async t => {
+      const item = document.querySelector("#item");
+      let num_events = 0;
+      await new Promise(resolve => addEventListener("animationstart", () => {
+        num_events++;
+        resolve();
+      }));
+
+      // Reparent item
+      document.body.querySelector("#new-parent").moveBefore(item, null);
+      await new Promise(resolve => requestAnimationFrame(() => resolve()));
+      assert_equals(num_events, 1);
+      assert_not_equals(getComputedStyle(item).left, "0px");
+    });
+  </script>
+</body>
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-animation-transform.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-animation-transform.html
new file mode 100644
index 0000000000..e7a285893a
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-animation-transform.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<title>Node.moveBefore should preserve CSS animation state (transform)</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+  <section id="old-parent">
+    <div id="item"></div>
+  </section>
+  <section id="new-parent">
+  </section>
+  <style>
+    @keyframes anim {
+      from {
+        transform: translateX(100px);
+      }
+
+      to {
+        transform: translateX(400px);
+      }
+    }
+
+    #item {
+      position: relative;
+      width: 100px;
+      height: 100px;
+      background: green;
+      animation: 1s linear infinite alternate anim;
+      animation-delay: 100ms;
+    }
+  </style>
+  <script>
+    promise_test(async t => {
+      const item = document.querySelector("#item");
+      let num_events = 0;
+      await new Promise(resolve => addEventListener("animationstart", () => {
+        num_events++;
+        resolve();
+      }));
+
+      // Reparent item
+      document.body.querySelector("#new-parent").moveBefore(item, null);
+      await new Promise(resolve => requestAnimationFrame(() => resolve()));
+      assert_equals(num_events, 1);
+      assert_not_equals(getComputedStyle(item).transform, "none");
+    });
+  </script>
+</body>
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-transition-left-pseudo.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-transition-left-pseudo.html
new file mode 100644
index 0000000000..fa51b16887
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-transition-left-pseudo.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<title>Node.moveBefore should preserve CSS transition state on pseudo-elements (left)</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+  <section id="old-parent">
+    <div id="item"></div>
+  </section>
+  <section id="new-parent">
+  </section>
+  <style>
+    #item {
+      width: 100px;
+      height: 100px;
+      background: green;
+      position: absolute;
+      left: 0;
+    }
+
+    #item::before {
+      content: "Foo";
+      width: 100px;
+      height: 100px;
+      background: green;
+      transition: left 60s steps(1, jump-both);
+      left: 0px;
+      position: absolute;
+    }
+
+    #item.big::before {
+      left: 400px;
+    }
+
+    section {
+      position: relative;
+    }
+
+    body {
+      margin-left: 0;
+    }
+  </style>
+  <script>
+    promise_test(async t => {
+      const item = document.querySelector("#item");
+      assert_equals(item.getBoundingClientRect().x, 0);
+      item.classList.add("big");
+      await new Promise(resolve => item.addEventListener("transitionstart", resolve));
+      document.querySelector("#new-parent").moveBefore(item, null);
+      await new Promise(resolve => requestAnimationFrame(() => resolve()));
+      assert_equals(getComputedStyle(item, "::before").left, "200px");
+    });
+  </script>
+</body>
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-transition-left.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-transition-left.html
new file mode 100644
index 0000000000..2b8e04b26e
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-transition-left.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<title>Node.moveBefore should preserve CSS transition state (left)</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+  <section id="old-parent">
+    <div id="item"></div>
+  </section>
+  <section id="new-parent">
+  </section>
+  <style>
+    #item {
+      width: 100px;
+      height: 100px;
+      background: green;
+      transition: left 10s;
+      position: absolute;
+      left: 0;
+    }
+
+    section {
+      position: relative;
+    }
+
+    body {
+      margin-left: 0;
+    }
+  </style>
+  <script>
+    promise_test(async t => {
+      const item = document.querySelector("#item");
+      assert_equals(item.getBoundingClientRect().x, 0);
+      item.style.left = "400px";
+      await new Promise(resolve => item.addEventListener("transitionstart", resolve));
+      document.querySelector("#new-parent").moveBefore(item, null);
+      await new Promise(resolve => requestAnimationFrame(() => resolve()));
+      assert_less_than(item.getBoundingClientRect().x, 399);
+    });
+  </script>
+</body>
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-transition-transform-pseudo.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-transition-transform-pseudo.html
new file mode 100644
index 0000000000..d02c72561c
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-transition-transform-pseudo.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<title>Node.moveBefore should preserve CSS transition state on pseudo-elements (transform)</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+  <section id="old-parent">
+    <div id="item"></div>
+  </section>
+  <section id="new-parent">
+  </section>
+  <style>
+    #item {
+      width: 100px;
+      height: 100px;
+      background: green;
+      position: absolute;
+      left: 0;
+    }
+
+    #item::before {
+      content: "Foo";
+      width: 100px;
+      height: 100px;
+      background: green;
+      transition: transform 60s steps(1, jump-both);
+      transform: none;
+      position: absolute;
+    }
+
+    #item.big::before {
+      transform: translateX(400px);
+    }
+
+    section {
+      position: relative;
+    }
+
+    body {
+      margin-left: 0;
+    }
+  </style>
+  <script>
+    promise_test(async t => {
+      const item = document.querySelector("#item");
+      assert_equals(item.getBoundingClientRect().x, 0);
+      item.classList.add("big");
+      await new Promise(resolve => item.addEventListener("transitionstart", resolve));
+      document.querySelector("#new-parent").moveBefore(item, null);
+      await new Promise(resolve => requestAnimationFrame(() => resolve()));
+      assert_not_equals(getComputedStyle(item, "::before").transform, "none");
+    });
+  </script>
+</body>
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-transition-transform.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-transition-transform.html
new file mode 100644
index 0000000000..f09edca144
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/continue-css-transition-transform.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<title>Node.moveBefore should preserve CSS transition state (transform)</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+  <section id="old-parent">
+    <div id="item"></div>
+  </section>
+  <section id="new-parent">
+  </section>
+  <style>
+    #item {
+      width: 100px;
+      height: 100px;
+      background: green;
+      transition: transform 60s steps(1, jump-both);
+    }
+
+    body {
+      margin-left: 0;
+    }
+  </style>
+  <script>
+    promise_test(async t => {
+      const item = document.querySelector("#item");
+      assert_equals(item.getBoundingClientRect().x, 0);
+      item.style.transform = "translateX(400px)";
+      await new Promise(resolve => item.addEventListener("transitionstart", resolve));
+      document.querySelector("#new-parent").moveBefore(item, null);
+      await new Promise(resolve => requestAnimationFrame(() => resolve()));
+      assert_equals(item.getBoundingClientRect().x, 200);
+      assert_equals(item.getAnimations().length, 1);
+    });
+  </script>
+</body>
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/css-animation-commit-styles.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/css-animation-commit-styles.html
new file mode 100644
index 0000000000..86bb7c33e4
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/css-animation-commit-styles.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<title>Calling commitStyles after Node.moveBefore should commit mid-transition value</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+  <section id="old-parent">
+    <div id="item"></div>
+  </section>
+  <section id="new-parent">
+  </section>
+  <style>
+    @keyframes anim {
+      from {
+        transform: translateX(100px);
+      }
+
+      to {
+        transform: translateX(400px);
+      }
+    }
+
+    #item {
+      position: relative;
+      width: 100px;
+      height: 100px;
+      background: green;
+      animation: 1s linear infinite alternate anim;
+      animation-delay: 100ms;
+    }
+  </style>
+  <script>
+    promise_test(async t => {
+      const item = document.querySelector("#item");
+      await new Promise(resolve => item.addEventListener("animationstart", resolve));
+
+      // Reparent item
+      document.body.querySelector("#new-parent").moveBefore(item, null);
+
+      item.getAnimations()[0].commitStyles();
+      assert_true("transform" in item.style);
+      assert_not_equals(item.style.transform, "none");
+    });
+  </script>
+</body>
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/css-transition-cross-document.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/css-transition-cross-document.html
new file mode 100644
index 0000000000..f3c8fafbfa
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/css-transition-cross-document.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<title>Node.moveBefore should not preserve CSS transition state when crossing document boundaries</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+  <iframe id="iframe">
+  </iframe>
+  <section id="new-parent">
+  </section>
+  <style id="style">
+    #item {
+      width: 100px;
+      height: 100px;
+      background: green;
+      transition: left 10s;
+      position: absolute;
+      left: 0;
+    }
+
+    section {
+      position: relative;
+    }
+
+    body {
+      margin-left: 0;
+    }
+  </style>
+  <script>
+    promise_test(async t => {
+      const iframe = document.querySelector("#iframe");
+      const style = document.querySelector("#style");
+      iframe.contentDocument.head.append(style.cloneNode(true));
+      const item = iframe.contentDocument.createElement("div");
+      item.id = "item";
+      iframe.contentDocument.body.append(item);
+      assert_equals(item.getBoundingClientRect().x, 0);
+      item.style.left = "400px";
+      await new Promise(resolve => item.addEventListener("transitionstart", resolve));
+      document.querySelector("#new-parent").moveBefore(item, null);
+      await new Promise(resolve => requestAnimationFrame(() => resolve()));
+      assert_greater_than(item.getBoundingClientRect().x, 399);
+    }, "Moving a transition across documents should reset its state");
+  </script>
+</body>
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/css-transition-cross-shadow.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/css-transition-cross-shadow.html
new file mode 100644
index 0000000000..145f40ba50
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/css-transition-cross-shadow.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html>
+<title>Node.moveBefore should not preserve CSS transition state when crossing shadow boundaries</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+  <section id="old-parent">
+    <div id="item"></div>
+  </section>
+  <div id="shadow-container">
+    <template shadowrootmode="open">
+      <style>
+        #item {
+          width: 100px;
+          height: 100px;
+          background: green;
+          transition: left 10s;
+          position: absolute;
+          left: 0;
+        }
+
+        section {
+          position: relative;
+        }
+
+        body {
+          margin-left: 0;
+        }
+      </style>
+      <section id="new-parent">
+      </section>
+    </template>
+  </div>
+  <style>
+    #item {
+      width: 100px;
+      height: 100px;
+      background: green;
+      transition: left 10s;
+      position: absolute;
+      left: 0;
+    }
+
+    section {
+      position: relative;
+    }
+
+    body {
+      margin-left: 0;
+    }
+  </style>
+  <script>
+    promise_test(async t => {
+      const item = document.querySelector("#item");
+      assert_equals(item.getBoundingClientRect().x, 0);
+      item.style.left = "400px";
+      await new Promise(resolve => item.addEventListener("transitionstart", resolve));
+      const shadowContainer = document.querySelector("#shadow-container");
+      shadowContainer.shadowRoot.querySelector("#new-parent").moveBefore(item, null);
+      await new Promise(resolve => requestAnimationFrame(() => resolve()));
+      assert_greater_than(item.getBoundingClientRect().x, 399);
+    }, "Moving an element with a transition across shadow boundaries should reset the transition");
+  </script>
+</body>
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/css-transition-to-disconnected-document.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/css-transition-to-disconnected-document.html
new file mode 100644
index 0000000000..537edfe9b6
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/css-transition-to-disconnected-document.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<title>Node.moveBefore should act like insertBefore when moving to a disconnected document</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+  <section id="old-parent">
+    <div id="item"></div>
+  </section>
+  <section id="new-parent">
+  </section>
+  <style>
+    #item {
+      width: 100px;
+      height: 100px;
+      background: green;
+      transition: left 10s;
+      position: absolute;
+      left: 0;
+    }
+
+    section {
+      position: relative;
+    }
+
+    body {
+      margin-left: 0;
+    }
+  </style>
+
+  <script>
+    promise_test(async t => {
+      const item = document.querySelector("#item");
+      assert_equals(item.getBoundingClientRect().x, 0);
+      item.style.left = "400px";
+      await new Promise(resolve => item.addEventListener("transitionstart", resolve));
+      const doc = document.implementation.createHTMLDocument();
+      doc.body.moveBefore(item, null);
+      await new Promise(resolve => requestAnimationFrame(() => resolve()));
+      assert_equals(item.getBoundingClientRect().x, 0);
+    }, "Moving an element with a transition to a disconnected document should reset the transitionm state");
+  </script>
+</body>
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/css-transition-trigger.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/css-transition-trigger.html
new file mode 100644
index 0000000000..0cb5608a69
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/css-transition-trigger.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<title>Node.moveBefore should trigger CSS transition state (left) if needed</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+  <section id="old-parent">
+    <div id="item"></div>
+  </section>
+  <section id="new-parent">
+  </section>
+  <style>
+    #item {
+      width: 100px;
+      height: 100px;
+      background: green;
+      transition: left 10s steps(1, jump-both);
+      position: absolute;
+      left: 0;
+    }
+
+    #new-parent #item {
+      left: 400px;
+    }
+
+    section {
+      position: relative;
+    }
+
+    body {
+      margin-left: 0;
+    }
+  </style>
+  <script>
+    promise_test(async t => {
+      const item = document.querySelector("#item");
+      assert_equals(item.getBoundingClientRect().x, 0);
+      document.querySelector("#new-parent").moveBefore(item, null);
+      await new Promise(resolve => item.addEventListener("transitionstart", resolve));
+      assert_equals(item.getBoundingClientRect().x, 200);
+    });
+  </script>
+</body>
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/focus-preserve.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/focus-preserve.html
new file mode 100644
index 0000000000..a00e8b7788
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/focus-preserve.html
@@ -0,0 +1,85 @@
+<!DOCTYPE html>
+<title>moveBefore should not automatically clear focus</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<section id="old_parent">
+<button id="button" tabindex="1">Button</button>
+</section>
+<section id="new_parent">
+</section>
+<section id="inert_parent" inert>
+</section>
+<section id="hidden_parent" hidden>
+</section>
+<script>
+
+function eventually_blurred(t, item, timeout = 1000) {
+    return new Promise((resolve, reject) => {
+        function onblur() {
+            resolve();
+            item.removeEventListener("blur", onblur);
+        }
+        item.addEventListener("blur", onblur);
+        t.step_timeout(reject, timeout);
+    });
+}
+
+test(t => {
+    const old_parent = document.querySelector("#old_parent");
+    const button = document.querySelector("#button");
+    t.add_cleanup(() => old_parent.append(button));
+    button.focus();
+    assert_equals(document.activeElement, button);
+    new_parent.moveBefore(button, null);
+    assert_equals(document.activeElement, button);
+}, "when reparenting an element, don't automatically reset the document focus");
+
+promise_test(async t => {
+    const old_parent = document.querySelector("#old_parent");
+    const button = document.querySelector("#button");
+    t.add_cleanup(() => old_parent.append(button));
+    const inert_parent = document.querySelector("#inert_parent");
+    button.focus();
+    assert_equals(document.activeElement, button);
+    inert_parent.moveBefore(button, null);
+
+    // The button will still be considered the active element. It will blur asynchronously.
+    assert_equals(document.activeElement, button);
+    await eventually_blurred(t, button);
+    assert_equals(document.activeElement, document.body);
+}, "when reparenting a focused element into an inert parent, reset the document focus");
+
+
+promise_test(async t => {
+    const old_parent = document.querySelector("#old_parent");
+    const button = document.querySelector("#button");
+    t.add_cleanup(() => old_parent.append(button));
+    const hidden_parent = document.querySelector("#hidden_parent");
+    button.focus();
+    assert_equals(document.activeElement, button);
+    hidden_parent.moveBefore(button, null);
+
+    // The button will still be considered the active element. It will blur asynchronously.
+    // This is similar to other operations that can cause a blur due to change in inert trees,
+    // e.g. a style change that makes an ancestor `display: none`.
+    assert_equals(document.activeElement, button);
+    await eventually_blurred(t, button);
+    assert_equals(document.activeElement, document.body);
+}, "when reparenting a focused element into a hidden parent, reset the document focus");
+
+promise_test(async t => {
+    const old_parent = document.querySelector("#old_parent");
+    const button = document.querySelector("#button");
+    t.add_cleanup(() => document.body.append(old_parent));
+    const hidden_parent = document.querySelector("#hidden_parent");
+    button.focus();
+    assert_equals(document.activeElement, button);
+    hidden_parent.moveBefore(old_parent, null);
+
+    // The button will still be considered the active element. It will blur asynchronously.
+    assert_equals(document.activeElement, button);
+    await eventually_blurred(t, button);
+    assert_equals(document.activeElement, document.body);
+}, "when reparenting an ancestor of an focused element into a hidden parent, reset the document focus");
+</script>
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/fullscreen-preserve.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/fullscreen-preserve.html
new file mode 100644
index 0000000000..810eeac9af
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/fullscreen-preserve.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<title>Document#fullscreenElement</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/fullscreen/trusted-click.js"></script>
+<section id="old_parent">
+    <div id="item"></div>
+</section>
+<section id="new_parent">
+    <div id="item"></div>
+</section>
+<script>
+    promise_test(async function (t) {
+        const item = document.querySelector("#item");
+
+        await trusted_click();
+
+        assert_equals(
+            document.fullscreenElement,
+            null,
+            "fullscreenElement before requestFullscreen()"
+        );
+
+        await item.requestFullscreen();
+        assert_equals(
+            document.fullscreenElement,
+            item,
+            "fullscreenElement before moveBefore()"
+        );
+
+        document.querySelector("#new_parent").moveBefore(item, null);
+
+        assert_equals(
+            document.fullscreenElement,
+            item,
+            "fullscreenElement after moveBefore()"
+        );
+
+        await Promise.all([document.exitFullscreen(), fullScreenChange()]);
+
+        assert_equals(
+            document.fullscreenElement,
+            null,
+            "fullscreenElement after exiting fullscreen"
+        );
+    });
+</script>
diff --git a/testing/web-platform/tests/dom/observable/tentative/observable-every.any.js b/testing/web-platform/tests/dom/observable/tentative/observable-every.any.js
new file mode 100644
index 0000000000..74a344b8f7
--- /dev/null
+++ b/testing/web-platform/tests/dom/observable/tentative/observable-every.any.js
@@ -0,0 +1,250 @@
+promise_test(async () => {
+  const source = new Observable(subscriber => {
+    subscriber.next("good");
+    subscriber.next("good");
+    subscriber.next("good");
+    subscriber.complete();
+  });
+
+  const result = await source.every((value) => value === "good");
+
+  assert_true(result, "Promise resolves with true if all values pass the predicate");
+}, "every(): Promise resolves to true if all values pass the predicate");
+
+promise_test(async () => {
+  const source = new Observable(subscriber => {
+    subscriber.next("good");
+    subscriber.next("good");
+    subscriber.next("bad");
+    subscriber.complete();
+  });
+
+  const result = await source.every((value) => value === "good");
+
+  assert_false(result, "Promise resolves with false if any value fails the predicate");
+}, "every(): Promise resolves to false if any value fails the predicate");
+
+promise_test(async () => {
+  let tornDown = false;
+  let subscriberActiveAfterFailingPredicate = true;
+  const source = new Observable(subscriber => {
+    subscriber.addTeardown(() => tornDown = true);
+    subscriber.next("good");
+    subscriber.next("good");
+    subscriber.next("bad");
+    subscriberActiveAfterFailingPredicate = subscriber.active;
+    subscriber.next("good");
+    subscriber.complete();
+  });
+
+  const result = await source.every((value) => value === "good");
+
+  assert_false(result, "Promise resolves with false if any value fails the predicate");
+  assert_false(subscriberActiveAfterFailingPredicate,
+      "Subscriber becomes inactive because every() unsubscribed");
+}, "every(): Abort the subscription to the source if the predicate does not pass");
+
+promise_test(async () => {
+  const logs = [];
+
+  const source = createTestSubject({
+    onSubscribe: () => logs.push("subscribed to source"),
+    onTeardown: () => logs.push("teardown"),
+  });
+
+  const resultPromise = source.every((value, index) => {
+    logs.push(`Predicate called with ${value}, ${index}`);
+    return true;
+  });
+
+  let promiseResolved = false;
+
+  resultPromise.then(() => promiseResolved = true);
+
+  assert_array_equals(logs, ["subscribed to source"],
+      "calling every() subscribes to the source immediately");
+
+  source.next("a");
+  assert_array_equals(logs, [
+    "subscribed to source",
+    "Predicate called with a, 0"
+  ], "Predicate called with the value and the index");
+
+  source.next("b");
+  assert_array_equals(logs, [
+    "subscribed to source",
+    "Predicate called with a, 0",
+    "Predicate called with b, 1",
+  ], "Predicate called with the value and the index");
+
+  // wait a tick, just to prove that you have to wait for complete to be called.
+  await Promise.resolve();
+
+  assert_false(promiseResolved,
+      "Promise should not resolve until after the source completes");
+
+  source.complete();
+  assert_array_equals(logs, [
+    "subscribed to source",
+    "Predicate called with a, 0",
+    "Predicate called with b, 1",
+    "teardown",
+  ], "Teardown function called immediately after the source completes");
+
+  const result = await resultPromise;
+
+  assert_true(result,
+      "Promise resolves with true if all values pass the predicate");
+}, "every(): Lifecycle checks when all values pass the predicate");
+
+promise_test(async () => {
+  const logs = [];
+
+  const source = createTestSubject({
+    onSubscribe: () => logs.push("subscribed to source"),
+    onTeardown: () => logs.push("teardown"),
+  });
+
+  const resultPromise = source.every((value, index) => {
+    logs.push(`Predicate called with ${value}, ${index}`);
+    return value === "good";
+  });
+
+  let promiseResolved = false;
+
+  resultPromise.then(() => promiseResolved = true);
+
+  assert_array_equals(logs, ["subscribed to source"],
+      "calling every() subscribes to the source immediately");
+
+  source.next("good");
+  source.next("good");
+  assert_array_equals(logs, [
+    "subscribed to source",
+    "Predicate called with good, 0",
+    "Predicate called with good, 1",
+  ], "Predicate called with the value and the index");
+
+  assert_false(promiseResolved, "Promise should not resolve until after the predicate fails");
+
+  source.next("bad");
+  assert_array_equals(logs, [
+    "subscribed to source",
+    "Predicate called with good, 0",
+    "Predicate called with good, 1",
+    "Predicate called with bad, 2",
+    "teardown",
+  ], "Predicate called with the value and the index, failing predicate immediately aborts subscription to source");
+
+  const result = await resultPromise;
+
+  assert_false(result, "Promise resolves with false if any value fails the predicate");
+}, "every(): Lifecycle checks when any value fails the predicate");
+
+promise_test(async () => {
+  const source = new Observable(subscriber => {
+    subscriber.complete();
+  });
+
+  const result = await source.every(() => true);
+
+  assert_true(result,
+      "Promise resolves with true if the observable completes without " +
+      "emitting a value");
+}, "every(): Resolves with true if the observable completes without " +
+   "emitting a value");
+
+promise_test(async t => {
+  const error = new Error("error from source");
+  const source = new Observable(subscriber => {
+    subscriber.error(error);
+  });
+
+  promise_rejects_exactly(t, error, source.every(() => true),
+      "Promise rejects with the error emitted from the source observable");
+}, "every(): Rejects with any error emitted from the source observable");
+
+promise_test(async t => {
+  const source = new Observable(subscriber => {
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.next(3);
+    subscriber.complete();
+  });
+
+  const error = new Error("bad value");
+  const promise = source.every(value => {
+    if (value <= 2) return true;
+    throw error;
+  });
+
+  promise_rejects_exactly(t, error, promise, "Promise rejects with the " +
+      "error thrown from the predicate");
+}, "every(): Rejects with any error thrown from the predicate");
+
+promise_test(async () => {
+  const indices = [];
+
+  const source = new Observable(subscriber => {
+    subscriber.next("a");
+    subscriber.next("b");
+    subscriber.next("c");
+    subscriber.complete();
+  });
+
+  const value = await source.every((value, index) => {
+    indices.push(index);
+    return true;
+  });
+
+  assert_array_equals(indices, [0, 1, 2]);
+
+  assert_true(value,
+      "Promise resolves with true if all values pass the predicate");
+}, "every(): Index is passed into the predicate");
+
+promise_test(async t => {
+  const source = new Observable(subscriber => {});
+
+  const controller = new AbortController();
+  const promise = source.every(() => true, { signal: controller.signal });
+  controller.abort();
+
+  promise_rejects_dom(t, 'AbortError', promise, "Promise rejects with a " +
+      "DOMException if the source Observable is aborted");
+}, "every(): Rejects with a DOMException if the source Observable is aborted");
+
+function createTestSubject(options) {
+  const onTeardown = options?.onTeardown;
+
+  const subscribers = new Set();
+  const subject = new Observable(subscriber => {
+    options?.onSubscribe?.();
+    subscribers.add(subscriber);
+    subscriber.addTeardown(() => subscribers.delete(subscriber));
+    if (onTeardown) {
+      subscriber.addTeardown(onTeardown);
+    }
+  });
+
+  subject.next = (value) => {
+    for (const subscriber of Array.from(subscribers)) {
+      subscriber.next(value);
+    }
+  };
+  subject.error = (error) => {
+    for (const subscriber of Array.from(subscribers)) {
+      subscriber.error(error);
+    }
+  };
+  subject.complete = () => {
+    for (const subscriber of Array.from(subscribers)) {
+      subscriber.complete();
+    }
+  };
+  subject.subscriberCount = () => {
+    return subscribers.size;
+  };
+
+  return subject;
+}
diff --git a/testing/web-platform/tests/dom/observable/tentative/observable-filter.any.js b/testing/web-platform/tests/dom/observable/tentative/observable-filter.any.js
index 8a49bcf467..3c1a7d7824 100644
--- a/testing/web-platform/tests/dom/observable/tentative/observable-filter.any.js
+++ b/testing/web-platform/tests/dom/observable/tentative/observable-filter.any.js
@@ -103,3 +103,15 @@ test(() => {
       ['source teardown', 'source abort event', 'filter observable complete']);
 }, "filter(): Upon source completion, source Observable teardown sequence " +
    "happens after downstream filter complete() is called");
+
+test(() => {
+  const source = new Observable(subscriber => {
+    subscriber.next('value1');
+    subscriber.next('value2');
+    subscriber.next('value3');
+  });
+
+  const indices = [];
+  source.filter((value, index) => indices.push(index)).subscribe();
+  assert_array_equals(indices, [0, 1, 2]);
+}, "filter(): Index is passed correctly to predicate");
diff --git a/testing/web-platform/tests/dom/observable/tentative/observable-find.any.js b/testing/web-platform/tests/dom/observable/tentative/observable-find.any.js
new file mode 100644
index 0000000000..0e09060fc5
--- /dev/null
+++ b/testing/web-platform/tests/dom/observable/tentative/observable-find.any.js
@@ -0,0 +1,85 @@
+promise_test(async () => {
+  let inactiveAfterB = false;
+  const source = new Observable(subscriber => {
+    subscriber.next("a");
+    subscriber.next("b");
+    inactiveAfterB = !subscriber.active;
+    subscriber.next("c");
+    subscriber.complete();
+  });
+
+  const value = await source.find((value) => value === "b");
+
+  assert_equals(value, "b", "Promise resolves with the first value that passes the predicate");
+
+  assert_true(inactiveAfterB, "subscriber is inactive after the first value that passes the predicate");
+}, "find(): Promise resolves with the first value that passes the predicate");
+
+promise_test(async () => {
+  const source = new Observable(subscriber => {
+    subscriber.next("a");
+    subscriber.next("b");
+    subscriber.next("c");
+    subscriber.complete();
+  });
+
+  const value = await source.find(() => false);
+
+  assert_equals(value, undefined, "Promise resolves with undefined if no value passes the predicate");
+}, "find(): Promise resolves with undefined if no value passes the predicate");
+
+promise_test(async t => {
+  const error = new Error("error from source");
+  const source = new Observable(subscriber => {
+    subscriber.error(error);
+  });
+
+  promise_rejects_exactly(t, error, source.find(() => true), "Promise " +
+      "rejects with the error emitted from the source Observable");
+}, "find(): Promise rejects with the error emitted from the source Observable");
+
+promise_test(async t => {
+  const source = new Observable(subscriber => {
+    subscriber.next("ignored");
+  });
+
+  const error = new Error("thrown from predicate");
+  promise_rejects_exactly(t, error, source.find(() => {throw error}),
+      "Promise rejects with any error thrown from the predicate");
+}, "find(): Promise rejects with any error thrown from the predicate");
+
+promise_test(async () => {
+  let indices = [];
+
+  const source = new Observable(subscriber => {
+    subscriber.next("a");
+    subscriber.next("b");
+    subscriber.next("c");
+    subscriber.complete();
+  });
+
+  const value = await source.find((value, index) => {
+    indices.push(index);
+    return false;
+  });
+
+  assert_equals(value, undefined, "Promise resolves with undefined if no value passes the predicate");
+
+  assert_array_equals(indices, [0, 1, 2], "find(): Passes the index of the value to the predicate");
+}, "find(): Passes the index of the value to the predicate");
+
+promise_test(async t => {
+  const controller = new AbortController();
+  const source = new Observable(subscriber => {
+    subscriber.next("a");
+    subscriber.next("b");
+    subscriber.next("c");
+    subscriber.complete();
+  });
+
+  controller.abort();
+  const promise = source.find(() => true, { signal: controller.signal });
+
+  promise_rejects_dom(t, 'AbortError', promise, "Promise rejects with " +
+      "DOMException when the signal is aborted");
+}, "find(): Rejects with AbortError when the signal is aborted");
diff --git a/testing/web-platform/tests/dom/observable/tentative/observable-inspect.any.js b/testing/web-platform/tests/dom/observable/tentative/observable-inspect.any.js
new file mode 100644
index 0000000000..8aff741d26
--- /dev/null
+++ b/testing/web-platform/tests/dom/observable/tentative/observable-inspect.any.js
@@ -0,0 +1,412 @@
+// Because we test that the global error handler is called at various times.
+setup({ allow_uncaught_exception: true });
+
+test(() => {
+  const results = [];
+  let sourceSubscriptionCall = 0;
+  const source = new Observable(subscriber => {
+    sourceSubscriptionCall++;
+    results.push(`source subscribe ${sourceSubscriptionCall}`);
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.next(3);
+    subscriber.complete();
+  });
+
+  let inspectSubscribeCall = 0;
+  const result = source.inspect({
+    subscribe: () => {
+      inspectSubscribeCall++;
+      results.push(`inspect() subscribe ${inspectSubscribeCall}`);
+    },
+    next: (value) => results.push(`inspect() next ${value}`),
+    error: (e) => results.push(`inspect() error ${e.message}`),
+    complete: () => results.push(`inspect() complete`),
+  });
+
+  result.subscribe({
+    next: (value) => results.push(`result next ${value}`),
+    error: (e) => results.push(`result error ${e.message}`),
+    complete: () => results.push(`result complete`),
+  });
+
+  result.subscribe({
+    next: (value) => results.push(`result next ${value}`),
+    error: (e) => results.push(`result error ${e.message}`),
+    complete: () => results.push(`result complete`),
+  });
+
+  assert_array_equals(results,
+    [
+      "inspect() subscribe 1",
+      "source subscribe 1",
+      "inspect() next 1",
+      "result next 1",
+      "inspect() next 2",
+      "result next 2",
+      "inspect() next 3",
+      "result next 3",
+      "inspect() complete",
+      "result complete",
+      "inspect() subscribe 2",
+      "source subscribe 2",
+      "inspect() next 1",
+      "result next 1",
+      "inspect() next 2",
+      "result next 2",
+      "inspect() next 3",
+      "result next 3",
+      "inspect() complete",
+      "result complete",
+    ]);
+}, "inspect(): Provides a pre-subscription subscribe callback");
+
+test(() => {
+  const source = new Observable(subscriber => {
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.next(3);
+    subscriber.complete();
+  });
+
+  const results = [];
+
+  const result = source.inspect({
+    next: value => results.push(value),
+    error: e => results.push(e),
+    complete: () => results.push("complete"),
+  });
+
+  result.subscribe();
+  result.subscribe();
+
+  assert_array_equals(results, [1, 2, 3, "complete", 1, 2, 3, "complete"]);
+}, "inspect(): Provides a way to tap into the values and completions of the " +
+   "source observable using an observer");
+
+test(() => {
+  const error = new Error("error from source");
+  const source = new Observable(subscriber => subscriber.error(error));
+
+  const results = [];
+
+  const result = source.inspect({
+    next: value => results.push(value),
+    error: e => results.push(e),
+    complete: () => results.push("complete"),
+  });
+
+  let errorReported = null;
+  self.addEventListener('error', e => errorReported = e.error, {once: true});
+  result.subscribe();
+
+  assert_array_equals(results, [error]);
+  assert_equals(errorReported, error,
+      "errorReported to global matches error from source Observable");
+}, "inspect(): Error handler does not stop error from being reported to the " +
+   "global, when subscriber does not pass error handler");
+
+test(() => {
+  const error = new Error("error from source");
+  const source = new Observable(subscriber => {
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.next(3);
+    subscriber.error(error);
+  });
+
+  const results = [];
+
+  const result = source.inspect({
+    next: value => results.push(value),
+    error: e => results.push(e),
+    complete: () => results.push("complete"),
+  });
+
+  const observer = {
+    error: e => results.push(e),
+  };
+  result.subscribe(observer);
+  result.subscribe(observer);
+
+  assert_array_equals(results, [1, 2, 3, error, error, 1, 2, 3, error, error]);
+}, "inspect(): Provides a way to tap into the values and errors of the " +
+   "source observable using an observer. Errors are passed through");
+
+test(() => {
+  const source = new Observable(subscriber => {
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.next(3);
+    subscriber.complete();
+  });
+
+  const results = [];
+
+  const result = source.inspect(value => results.push(value));
+
+  result.subscribe();
+  result.subscribe();
+
+  assert_array_equals(results, [1, 2, 3, 1, 2, 3]);
+}, "inspect(): ObserverCallback passed in");
+
+test(() => {
+  const source = new Observable(subscriber => {
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.next(3);
+  });
+
+  const error = new Error("error from inspect() next handler");
+  const result = source.inspect({
+    next: (value) => {
+      if (value === 2) {
+        throw error;
+      }
+    },
+  });
+
+  const results1 = [];
+  result.subscribe({
+    next: (value) => results1.push(value),
+    error: (e) => results1.push(e),
+    complete: () => results1.push("complete"),
+  });
+
+  const results2 = [];
+  result.subscribe({
+    next: (value) => results2.push(value),
+    error: (e) => results2.push(e),
+    complete: () => results2.push("complete"),
+  });
+
+  assert_array_equals(results1, [1, error]);
+  assert_array_equals(results2, [1, error]);
+}, "inspect(): Throwing an error in the observer next handler is caught and " +
+   "sent to the error callback of the result observable");
+
+test(() => {
+  const sourceError = new Error("error from source");
+  const inspectError = new Error("error from inspect() error handler");
+
+  const source = new Observable(subscriber => {
+    subscriber.error(sourceError);
+  });
+
+  const result = source.inspect({
+    error: () => {
+      throw inspectError;
+    },
+  });
+
+  const results = [];
+  result.subscribe({
+    next: () => results.push("next"),
+    error: (e) => results.push(e),
+    complete: () => results.push("complete"),
+  });
+
+  assert_array_equals(results, [inspectError]);
+}, "inspect(): Throwing an error in the observer error handler in " +
+   "inspect() is caught and sent to the error callback of the result " +
+   "observable");
+
+test(() => {
+  const source = new Observable(subscriber => {
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.next(3);
+    subscriber.complete();
+  });
+
+  const error = new Error("error from inspect() complete handler");
+  const result = source.inspect({
+    complete: () => {
+      throw error;
+    },
+  });
+
+  const results = [];
+  result.subscribe({
+    next: (value) => results.push(value),
+    error: (e) => results.push(e),
+    complete: () => results.push("complete"),
+  });
+
+  assert_array_equals(results, [1, 2, 3, error]);
+}, "inspect(): Throwing an error in the observer complete handler is caught " +
+   "and sent to the error callback of the result observable");
+
+test(() => {
+  const source = new Observable(subscriber => {
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.next(3);
+  });
+
+  const error = new Error("error from inspect() next handler");
+  const result = source.inspect({
+    next: (value) => {
+      if (value === 2) {
+        throw error;
+      }
+    },
+  });
+
+  const results = [];
+  result.subscribe({
+    next: (value) => results.push(value),
+    error: (e) => results.push(e),
+    complete: () => results.push("complete"),
+  });
+
+  assert_array_equals(results, [1, error]);
+}, "inspect(): Throwing an error in the next handler function in do should " +
+   "be caught and sent to the error callback of the result observable");
+
+test(() => {
+  const source = new Observable(subscriber => {});
+
+  const result = source.inspect({
+    subscribe: () => {
+      throw new Error("error from do subscribe handler");
+    },
+  });
+
+  const results = [];
+  result.subscribe({
+    next: () => results.push("next"),
+    error: (e) => results.push(e.message),
+    complete: () => results.push("complete"),
+  });
+
+  assert_array_equals(results, ["error from do subscribe handler"]);
+}, "inspect(): Errors thrown in subscribe() Inspector handler subscribe " +
+   "handler are caught and sent to error callback");
+
+test(() => {
+  const results = [];
+  let sourceTeardownCall = 0;
+  const source = new Observable(subscriber => {
+    subscriber.addTeardown(() => {
+      sourceTeardownCall++;
+      results.push(`source teardown ${sourceTeardownCall}`);
+    });
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.next(3);
+    subscriber.complete();
+  });
+
+  let doUnsubscribeCall = 0;
+  const result = source.inspect({
+    abort: (reason) => {
+      doUnsubscribeCall++;
+      results.push(`inspect() abort ${doUnsubscribeCall} ${reason}`);
+    },
+    next: (value) => results.push(`inspect() next ${value}`),
+    error: (e) => results.push(`inspect() error ${e.message}`),
+    complete: () => results.push(`inspect() complete`),
+  });
+
+  const controller = new AbortController();
+  result.subscribe({
+    next: (value) => {
+      results.push(`result next ${value}`);
+      if (value === 2) {
+        controller.abort("abort reason");
+      }
+    },
+    error: (e) => results.push(`result error ${e.message}`),
+    complete: () => results.push(`result complete`),
+  }, { signal: controller.signal });
+
+  assert_array_equals(results, [
+    "inspect() next 1",
+    "result next 1",
+    "inspect() next 2",
+    "result next 2",
+    "inspect() abort 1 abort reason",
+    "source teardown 1",
+  ]);
+}, "inspect(): Provides a way to tap into the moment a source observable is unsubscribed from");
+
+test(() => {
+  const results = [];
+  let sourceTeardownCall = 0;
+  const source = new Observable(subscriber => {
+    subscriber.addTeardown(() => {
+      sourceTeardownCall++;
+      results.push(`source teardown ${sourceTeardownCall}`);
+    });
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.next(3);
+    subscriber.complete();
+  });
+
+  let inspectUnsubscribeCall = 0;
+  const result = source.inspect({
+    next: (value) => results.push(`inspect() next ${value}`),
+    complete: () => results.push(`inspect() complete`),
+    abort: (reason) => {
+      inspectUnsubscribeCall++;
+      results.push(`inspect() abort ${inspectUnsubscribeCall} ${reason}`);
+    },
+  });
+
+  result.subscribe({
+    next: (value) => results.push(`result next ${value}`),
+    complete: () => results.push(`result complete`),
+  });
+
+  assert_array_equals(results, [
+    "inspect() next 1",
+    "result next 1",
+    "inspect() next 2",
+    "result next 2",
+    "inspect() next 3",
+    "result next 3",
+    "source teardown 1",
+    "inspect() complete",
+    "result complete",
+  ]);
+}, "inspect(): Inspector abort() handler is not called if the source " +
+   "completes before the result is unsubscribed from");
+
+test(() => {
+  const source = new Observable(subscriber => {
+    subscriber.next(1);
+  });
+
+  const results = [];
+
+  const result = source.inspect({
+    abort: () => {
+      results.push('abort() handler run');
+      throw new Error("error from inspect() subscribe handler");
+    },
+  });
+
+  const controller = new AbortController();
+
+  self.on('error').take(1).subscribe(e =>
+      results.push(e.message + ', from report exception'));
+
+  result.subscribe({
+    next: (value) => {
+      results.push(value);
+      controller.abort();
+    },
+    // This should not be invoked at all!!
+    error: (e) => results.push(e.message + ', from Observer#error()'),
+    complete: () => results.push("complete"),
+  }, {signal: controller.signal});
+
+  assert_array_equals(results, [1, "abort() handler run",
+      "Uncaught Error: error from inspect() subscribe handler, from report " +
+      "exception"]);
+}, "inspect(): Errors thrown from inspect()'s abort() handler are caught " +
+   "and reported to the global, because the subscription is already closed " +
+   "by the time the handler runs");
diff --git a/testing/web-platform/tests/dom/observable/tentative/observable-some.any.js b/testing/web-platform/tests/dom/observable/tentative/observable-some.any.js
new file mode 100644
index 0000000000..b692610df3
--- /dev/null
+++ b/testing/web-platform/tests/dom/observable/tentative/observable-some.any.js
@@ -0,0 +1,96 @@
+promise_test(async () => {
+  let inactiveAfterFirstGood = true;
+
+  const source = new Observable(subscriber => {
+    subscriber.next("good");
+    inactiveAfterFirstGood = !subscriber.active;
+    subscriber.next("good");
+    subscriber.next("good");
+    subscriber.complete();
+  });
+
+  const result = await source.some((value) => value === "good");
+
+  assert_true(result, "Promise resolves with true if any value passes the predicate");
+
+  assert_true(inactiveAfterFirstGood,
+      "subscriber is inactive after the first value that passes the " +
+      "predicate, because the source was unsubscribed from");
+}, "some(): subscriber is inactive after the first value that passes the predicate, because the source was unsubscribed from");
+
+promise_test(async () => {
+  const source = new Observable(subscriber => {
+    subscriber.next("bad");
+    subscriber.next("bad");
+    subscriber.next("bad");
+    subscriber.complete();
+  });
+
+  const result = await source.some((value) => value === "good");
+
+  assert_false(result, "some(): Promise resolves with false if no value passes the predicate");
+});
+
+promise_test(async () => {
+  const source = new Observable(subscriber => {
+    subscriber.next("bad");
+    subscriber.next("bad");
+    subscriber.next("good");
+    subscriber.complete();
+  });
+
+  const result = await source.some((value) => value === "good");
+
+  assert_true(result, "some(): Promise resolves with true if any value passes the predicate");
+});
+
+promise_test(async t => {
+  const source = new Observable(subscriber => {
+    subscriber.next("not used");
+  });
+
+  const error = new Error("thrown from predicate");
+  promise_rejects_exactly(t, error, source.some(() => {throw error}),
+      "The returned promise rejects with an error if the predicate errors");
+}, "some(): The returned promise rejects with an error if the predicate errors");
+
+promise_test(async t => {
+  const error = new Error("error from source");
+  const source = new Observable(subscriber => {
+    subscriber.error(error);
+  });
+
+  promise_rejects_exactly(t, error, source.some(() => true),
+      "The returned promise rejects with an error if the source observable errors");
+}, "some(): The returned promise rejects with an error if the source observable errors");
+
+promise_test(async () => {
+  const source = new Observable(subscriber => {
+    subscriber.complete();
+  });
+
+  const result = await source.some(() => true);
+
+  assert_false(result,
+      "The returned promise resolves as false if the source observable " +
+      "completes without emitting a value");
+}, "some(): The returned promise resolves as false if the source observable " +
+   "completes without emitting a value");
+
+promise_test(async t => {
+  let teardownCalled = false;
+  const source = new Observable(subscriber => {
+    subscriber.addTeardown(() => {
+      teardownCalled = true;
+    });
+  });
+
+  const controller = new AbortController();
+  const promise = source.some(() => true, { signal: controller.signal });
+
+  controller.abort();
+
+  promise_rejects_dom(t, 'AbortError', promise);
+  assert_true(teardownCalled,
+      "The teardown function is called when the signal is aborted");
+}, "some(): The return promise rejects with a DOMException if the signal is aborted");
diff --git a/testing/web-platform/tests/dom/ranges/Range-isPointInRange-shadowdom.tentative.html b/testing/web-platform/tests/dom/ranges/Range-isPointInRange-shadowdom.tentative.html
new file mode 100644
index 0000000000..a90ddcf584
--- /dev/null
+++ b/testing/web-platform/tests/dom/ranges/Range-isPointInRange-shadowdom.tentative.html
@@ -0,0 +1,75 @@
+<!doctype html>
+<title>Range.isPointInRange() with ShadowDOM selection tests</title>
+<link rel="author" title="Sean Feng" href=sefeng@mozilla.com>
+<div id=log></div>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<span id="start">Start</span>
+<div id="host">
+  <template shadowrootmode="open">
+    <span id="inner1">Inner1</span>
+    <span id="inner2">Inner2</span>
+  </template>
+</div>
+<span id="end">End</span>
+<script>
+"use strict";
+
+test(function() {
+  assert_implements(window.getSelection().getComposedRanges, "GetComposedRanges is not supported");
+  const start = document.getElementById("start");
+  const shadowRoot = document.getElementById("host").shadowRoot;
+
+  const end = shadowRoot.getElementById("inner2");
+  const inner1 = shadowRoot.getElementById("inner1");
+
+  window.getSelection().setBaseAndExtent(start.firstChild, 3, end.firstChild, 3);
+
+  const composedRange = window.getSelection().getComposedRanges(shadowRoot)[0];
+  // Sanity check to make sure we have selected something across the shadow boundary.
+  assert_true(composedRange.startContainer == start.firstChild);
+  assert_true(composedRange.startOffset == 3);
+  assert_true(composedRange.endContainer == end.firstChild);
+  assert_true(composedRange.endOffset == 3);
+
+  assert_true(window.getSelection().isCollapsed, "Selection should be collapsed");
+
+  const range = window.getSelection().getRangeAt(0);
+  assert_false(range.isPointInRange(inner1, 0), "inner1 is in the shadow tree, should not be in the range");
+  assert_true(range.comparePoint(inner1, 0) == -1, "inner1 is in the shadow tree, should return -1 for comparison");
+}, "isPointInRange() test for collapsed selection");
+
+test(function() {
+  assert_implements(window.getSelection().getComposedRanges, "GetComposedRanges is not supported");
+  const start = document.getElementById("start");
+  const shadowRoot = document.getElementById("host").shadowRoot;
+
+  const end = document.getElementById("end");
+  const inner1 = shadowRoot.getElementById("inner1");
+
+  window.getSelection().setBaseAndExtent(start.firstChild, 3, end.firstChild, 3);
+
+  const composedRange = window.getSelection().getRangeAt(0);
+  // Sanity check to make sure we have selected something
+  assert_true(composedRange.startContainer == start.firstChild);
+  assert_true(composedRange.startOffset == 3);
+  assert_true(composedRange.endContainer == end.firstChild);
+  assert_true(composedRange.endOffset == 3);
+
+  assert_false(window.getSelection().isCollapsed, "Range should not be collapsed");
+
+  const range = window.getSelection().getRangeAt(0);
+
+  assert_false(range.isPointInRange(inner1, 0), "inner1 is in the shadow tree, should not be in the range");
+
+  // The selection is not collapsed so inner1 is not in the same tree as the selection.
+  assert_throws_dom("WrongDocumentError", function() {
+    range.comparePoint(inner1, 0);
+  });
+
+  const host = document.getElementById("host");
+  assert_true(range.isPointInRange(host, 0), "host is not in the shadow tree, should be in the range");
+  assert_true(range.comparePoint(host, 0) == 0, "host is not in the shadow tree, should return 0 for comparison");
+}, "isPointInRange() test for non-collapsed selection");
+
+</script>
diff --git a/testing/web-platform/tests/dom/xslt/resources/xml2html.xsl b/testing/web-platform/tests/dom/xslt/resources/xml2html.xsl
index 07b967500f..88b74a9620 100644
--- a/testing/web-platform/tests/dom/xslt/resources/xml2html.xsl
+++ b/testing/web-platform/tests/dom/xslt/resources/xml2html.xsl
@@ -5,7 +5,7 @@ xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:template match="/">
   <html>
   <body>
-  <h2>My CD Collection</h2>
+  <h2 style="margin-top:0">My CD Collection</h2>
   <table border="1">
     <tr bgcolor="#9acd32">
       <th>Title</th>
author	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-06-12 05:43:14 +0000
committer	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-06-12 05:43:14 +0000
commit	8dd16259287f58f9273002717ec4d27e97127719 (patch)
tree	3863e62a53829a84037444beab3abd4ed9dfc7d0 /testing/web-platform/tests/dom
parent	Releasing progress-linux version 126.0.1-1~progress7.99u1. (diff)
download	firefox-8dd16259287f58f9273002717ec4d27e97127719.tar.xz firefox-8dd16259287f58f9273002717ec4d27e97127719.zip