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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /custom-elements/perform-microtask-checkpoint-before-construction-xml-parser.xhtml - WPT Dashboard Interop Dashboard
<?xml version="1.0" encoding="utf-8"?>
<head>
<title>Custom Elements: create an element for a token must perform a microtask checkpoint</title>
<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org" />
<meta name="assert" content="When the HTML parser creates an element for a token, it must perform a microtask checkpoint before invoking the constructor" />
<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/webappapis.html#perform-a-microtask-checkpoint" />
<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>
<![CDATA[
async function construct_custom_element_in_parser(test, markup)
{
const window = await create_window_in_test_async(test, 'application/xml', `<?xml version="1.0" encoding="utf-8"?>
<body><script>
class SomeElement extends HTMLElement {
constructor() {
super();
window.recordsListInConstructor = recordsList.map((records) => records.slice(0));
}
}
customElements.define('some-element', SomeElement);
const recordsList = [];
const observer = new MutationObserver((records) => {
recordsList.push(records);
});
observer.observe(document.body, {childList: true, subtree: true});
window.onload = () => {
window.recordsListInDOMContentLoaded = recordsList.map((records) => records.slice(0));
}
</scr` + `ipt>${markup}</body></html>`);
return window;
}
promise_test(async function () {
const contentWindow = await construct_custom_element_in_parser(this, '<b><some-element></some-element></b>');
const contentDocument = contentWindow.document;
let recordsList = contentWindow.recordsListInConstructor;
assert_true(Array.isArray(recordsList));
assert_equals(recordsList.length, 1);
assert_true(Array.isArray(recordsList[0]));
assert_equals(recordsList[0].length, 1);
let record = recordsList[0][0];
assert_equals(record.type, 'childList');
assert_equals(record.target, contentDocument.body);
assert_equals(record.previousSibling, contentDocument.querySelector('script'));
assert_equals(record.nextSibling, null);
assert_equals(record.removedNodes.length, 0);
assert_equals(record.addedNodes.length, 1);
assert_equals(record.addedNodes[0], contentDocument.querySelector('b'));
recordsList = contentWindow.recordsListInDOMContentLoaded;
assert_true(Array.isArray(recordsList));
assert_equals(recordsList.length, 2);
assert_true(Array.isArray(recordsList[1]));
assert_equals(recordsList[1].length, 1);
record = recordsList[1][0];
assert_equals(record.type, 'childList');
assert_equals(record.target, contentDocument.querySelector('b'));
assert_equals(record.previousSibling, null);
assert_equals(record.nextSibling, null);
assert_equals(record.removedNodes.length, 0);
assert_equals(record.addedNodes.length, 1);
assert_equals(record.addedNodes[0], contentDocument.querySelector('some-element'));
}, 'XML parser must perform a microtask checkpoint before constructing a custom element');
]]>
</script>
</body>
</html>