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- This WPT test may be referenced by the following Test IDs:
- /html/syntax/parsing/adoption-agency-reparenting-cycle.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<meta charset="utf-8">
<title>Adoption agency: move that would create a cycle (furthest block contains common ancestor)</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 because it has crashed implementations.
//
// <div id=ca><b><p id=fb>: commonAncestor is #ca, furthestBlock is #fb. The
// inline script detaches #fb, then moves #ca *inside* #fb. The algorithm's
// step "Insert lastNode ... at the adjusted insertion location" then tries to
// insert #fb into #ca (now its own descendant) — a cycle. The prose has no
// guard; WebKit skips the move, dropping the subtree.
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');document.body.appendChild(window.fb);window.fb.appendChild(window.ca)<\/script></b></div>`);
const w = iframe.contentWindow;
assert_equals(tree(iframe.contentDocument.body), ``,
"main document body is empty (the cycle-inducing move was dropped)");
assert_false(w.fb.isConnected, "furthest block ends up detached");
assert_false(w.ca.isConnected, "common ancestor ends up detached");
}, "Adoption agency move that would create a cycle (furthest block contains common ancestor)");
</script>