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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="timeout" content="long">
<meta name="author" title="Keith Cirkel" href="mailto:wpt@keithcirkel.co.uk" />
<link rel="help" href="https://html.spec.whatwg.org/multipage/custom-elements.html#custom-state-pseudo-class" />
<title>CustomStateSet doesn't crash after GC on detached node</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/gc.js"></script>
</head>
<body>
<custom-state id="myCE"></custom-state>
<script>
customElements.define('custom-state', class extends HTMLElement {
connectedCallback() {
this.elementInternals = this.attachInternals();
}
});
promise_test(async function() {
const states = myCE.elementInternals.states;
myCE.remove();
await garbageCollect();
states.add('still-works');
assert_equals(states.size, 1);
assert_true(states.delete('still-works'));
assert_equals(states.size, 0);
}, "customstateset doesn't crash after GC on detached node");
</script>
</body>
</html>
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