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Fix some edge cases with nested <template for> and custom elements #61943

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chromium-wpt-export-bot merged 1 commit into from
Aug 15, 2026
Merged

Fix some edge cases with nested <template for> and custom elements #61943

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49 changes: 49 additions & 0 deletions html/dom/partial-updates/tentative/chained-streaming-templates-with-custom-element.html
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<meta charset="utf-8">
<title>Declarative Fragment: Chained streaming templates</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<div id="target"><?marker name="target"?>Original Target<?end></div>

<script>
class CustomElement extends HTMLElement {
constructor() {
super();
window.customElementRun = true;
window.ceOwnerDocument = this.ownerDocument;
}
}
customElements.define('custom-element', CustomElement);
</script>

<template for="target" id="outer">
<!-- This is the outer streaming template.
Its content goes into 'target' -->
<div id="inner-div"><?marker name="inner"?></div>
<template for="inner">
<!-- This is the inner streaming template.
Its scope will be the outer template element. -->
<custom-element id="ce"></custom-element>
<span id="streamed">Streamed</span>
</template>
</template>

<script>
test(() => {
assert_true(window.customElementRun, "Custom element constructor should run");
assert_equals(window.ceOwnerDocument, document, "ownerDocument should be the main document");

const target = document.getElementById('target');
assert_not_equals(target, null);

// The inner template streams content into 'inner' marker, which is inside 'target'
const ce = document.getElementById('ce');
assert_not_equals(ce, null, "Custom element should be in the document");
assert_equals(ce.parentNode.id, 'inner-div', "Custom element should be appended to the inner div");

const streamed = document.getElementById('streamed');
assert_not_equals(streamed, null, "Span should be in the document");
}, "Chained streaming templates and OwnerDocument");
</script>
</body>
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