element-mutation-null-registry-removal.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /custom-elements/registries/element-mutation-null-registry-removal.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>An element's null customElementRegistry should not mutate after removal</title>

<meta name="author" title="Jayson Chen" href="mailto:jaysonchen@microsoft.com">

<link rel="help" href="https://wicg.github.io/webcomponents/proposals/Scoped-Custom-Element-Registries">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<body>

<div id="host">

    <template shadowrootmode="open" shadowrootcustomelementregistry>

        <x-el></x-el>

    </template>

</div>

<script>

test(() => {

    const sr = host.shadowRoot;

    const el = sr.querySelector('x-el');

    assert_equals(el.customElementRegistry, null,

        'customElementRegistry should be null while in null-registry shadow root');

    el.remove();

    assert_equals(el.customElementRegistry, null,

        'customElementRegistry should remain null after removal from null-registry shadow root');

}, "An element's null customElementRegistry should not mutate after removal from a declarative shadow root with shadowrootcustomelementregistry.");

</script>

</body>