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+<!DOCTYPE html>
+<html>
+<head>
+<title>Custom Elements: create an element for a token must increment and decrement document's throw-on-dynamic-markup-insertion counter</title>
+<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
+<meta name="assert" content="Invoking document.open, document.write, document.writeln, and document.write must throw an exception when the HTML parser is creating a custom element for a token">
+ <meta name="help" content="https://html.spec.whatwg.org/multipage/parsing.html#create-an-element-for-the-token">
+<meta name="help" content="https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#throw-on-dynamic-markup-insertion-counter">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="./resources/custom-elements-helpers.js"></script>
+</head>
+<body>
+<div id="log"></div>
+<script>
+
+async function custom_element_reactions_in_parser(test, call_function)
+{
+    const window = await create_window_in_test(test);
+    const document = window.document;
+
+    document.open();
+
+    let executed = false;
+    let exception = null;
+    class CustomElement extends window.HTMLElement {
+        attributeChangedCallback(name, oldValue, newValue) {
+            try {
+                call_function(document, window);
+            } catch (error) {
+                exception = error;
+            }
+           executed = true;
+        }
+    }
+    CustomElement.observedAttributes = ['title'];
+    window.customElements.define('some-element', CustomElement);
+
+    document.write('<!DOCTYPE html><html><body><some-element title="some title"></some-element></body></html>');
+    document.close();
+
+    assert_true(executed, 'Must immediately process custom element reactions for setting attributes');
+    return {frameElement, window, document, exception};
+}
+
+promise_test(async function () {
+    const result = await custom_element_reactions_in_parser(this, (document) => document.open());
+    assert_throws_dom('InvalidStateError', result.window.DOMException, () => { throw result.exception; }, 'Must throw an InvalidStateError');
+}, 'document.open() must throw an InvalidStateError when processing custom element reactions for a synchronous constructed custom element');
+
+promise_test(async function () {
+    const result = await custom_element_reactions_in_parser(this, (document) => document.open('text/html'));
+    assert_throws_dom('InvalidStateError', result.window.DOMException, () => { throw result.exception; }, 'Must throw an InvalidStateError');
+}, 'document.open("text/html") must throw an InvalidStateError when processing custom element reactions for a synchronous constructed custom element');
+
+// https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#dom-document-open-window
+promise_test(async function () {
+    let load_promise = new Promise((resolve) => window.onmessage = (event) => resolve(event.data));
+    const result = await custom_element_reactions_in_parser(this, (document, window) => document.open('resources/navigation-destination.html', '_self', ''));
+    assert_equals(result.exception, null);
+    assert_equals(await load_promise, 'didNavigate');
+}, 'document.open(URL) must NOT throw an InvalidStateError when processing custom element reactions for a synchronous constructed custom element');
+
+promise_test(async function () {
+    const result = await custom_element_reactions_in_parser(this, (document) => document.close());
+    assert_throws_dom('InvalidStateError', result.window.DOMException, () => { throw result.exception; }, 'Must throw an InvalidStateError');
+}, 'document.close() must throw an InvalidStateError when processing custom element reactions for a synchronous constructed custom element');
+
+promise_test(async function () {
+    const result = await custom_element_reactions_in_parser(this, (document) => document.write('<b>some text</b>'));
+    assert_throws_dom('InvalidStateError', result.window.DOMException, () => { throw result.exception; }, 'Must throw an InvalidStateError');
+    assert_equals(result.document.querySelector('b'), null, 'Must not insert new content');
+    assert_false(result.document.documentElement.innerHTML.includes('some text'), 'Must not insert new content');
+}, 'document.write must throw an InvalidStateError when processing custom element reactions for a synchronous constructed custom element');
+
+promise_test(async function () {
+    const result = await custom_element_reactions_in_parser(this, (document) => document.writeln('<b>some text</b>'));
+    assert_throws_dom('InvalidStateError', result.window.DOMException, () => { throw result.exception; }, 'Must throw an InvalidStateError');
+    assert_equals(result.document.querySelector('b'), null, 'Must not insert new content');
+    assert_false(result.document.documentElement.innerHTML.includes('some text'), 'Must not insert new content');
+}, 'document.writeln must throw an InvalidStateError when processing custom element reactions for a synchronous constructed custom element');
+
+promise_test(async function () {
+    const another_window = await create_window_in_test(this);
+    const result = await custom_element_reactions_in_parser(this, (document) => another_window.document.open());
+    assert_equals(result.exception, null);
+}, 'document.open() of another document must not throw an InvalidStateError when processing custom element reactions for a synchronous constructed custom element');
+
+promise_test(async function () {
+    const another_window = await create_window_in_test(this);
+    const result = await custom_element_reactions_in_parser(this, (document) => another_window.document.open('text/html'));
+    assert_equals(result.exception, null);
+}, 'document.open("text/html") of another document must not throw an InvalidStateError when processing custom element reactions for a synchronous constructed custom element');
+
+promise_test(async function () {
+    const another_window = await create_window_in_test(this);
+    const result = await custom_element_reactions_in_parser(this, (document) => another_window.document.close());
+    assert_equals(result.exception, null);
+}, 'document.close() of another document must not throw an InvalidStateError when processing custom element reactions for a synchronous constructed custom element');
+
+promise_test(async function () {
+    const another_window = await create_window_in_test(this);
+    const result = await custom_element_reactions_in_parser(this, (document) => another_window.document.write('<b>some text</b>'));
+    assert_equals(result.exception, null);
+    assert_equals(another_window.document.querySelector('b').outerHTML, '<b>some text</b>');
+}, 'document.write of another document must not throw an InvalidStateError when processing custom element reactions for a synchronous constructed custom element');
+
+promise_test(async function () {
+    const another_window = await create_window_in_test(this);
+    const result = await custom_element_reactions_in_parser(this, (document) => another_window.document.writeln('<b>some text</b>'));
+    assert_equals(result.exception, null);
+    assert_equals(another_window.document.querySelector('b').outerHTML, '<b>some text</b>');
+}, 'document.writeln of another document must not throw an InvalidStateError when processing custom element reactions for a synchronous constructed custom element');
+
+</script>
+</body>
+</html>