Source code
Revision control
Copy as Markdown
Other Tools
Test Info:
- This WPT test may be referenced by the following Test IDs:
- /html/syntax/parsing/adoption-agency-reparenting-shadow-cycle.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<meta charset="utf-8">
<title>Adoption agency: host-including (shadow-crossing) cycle</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/parsing.html#adoption-agency-algorithm">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/adoption-agency-reparenting.js"></script>
<body>
<script>
// Isolated in case implementations crash.
//
// Like the cycle test, but the cycle crosses a shadow boundary: script puts the
// common ancestor (#ca) inside a shadow root whose host is a descendant of the
// furthest block (#fb). Inserting #fb into #ca is then a host-including
// inclusive-ancestor cycle, but *not* a same-tree containment (the target is in a
// shadow tree). A guard that only checks same-tree containment would miss it and
// build a cross-boundary cycle. The furthest block must be dropped.
promise_test(async t => {
const iframe = await parseInIframe(t, `<div id=ca><b><p id=fb><script>window.fb=document.getElementById('fb');window.ca=document.getElementById('ca');var host=document.createElement('span');var root=host.attachShadow({mode:'open'});document.body.appendChild(window.fb);window.fb.appendChild(host);root.appendChild(window.ca)<\/script></b></div>`);
const w = iframe.contentWindow;
assert_equals(tree(iframe.contentDocument.body), ``, "main document body is empty");
assert_false(w.ca.contains(w.fb),
"furthest block was not moved into the common ancestor");
assert_equals(w.fb.parentNode, null, "furthest block ends up parentless (dropped)");
}, "Adoption agency move that would create a host-including (shadow-crossing) cycle");
</script>