ShadowRoot-init-customElements.tentative.html

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This test has a WPT meta file that expects 4 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /custom-elements/revamped-scoped-registry/ShadowRoot-init-customElements.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<head>

<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">

<link rel="help" href="https://github.com/whatwg/html/issues/10854">

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

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

</head>

<body>

<script>

test(() => {

    const shadowRoot = document.createElement('div').attachShadow({mode: 'closed'});

    assert_equals(shadowRoot.customElements, window.customElements);

}, 'A newly attached disconnected ShadowRoot should use the global registry by default');

test(() => {

    const host = document.body.appendChild(document.createElement('div'));

    const shadowRoot = host.attachShadow({mode: 'closed'});

    assert_equals(shadowRoot.customElements, window.customElements);

}, 'A newly attached connected ShadowRoot should use the global registry by default');

test(() => {

    const registry = new CustomElementRegistry;

    const shadowRoot = document.createElement('div').attachShadow({mode: 'closed', customElements: registry});

    assert_equals(shadowRoot.customElements, registry);

}, 'A newly attached disconnected ShadowRoot should use the scoped registry if explicitly specified in attachShadow');

test(() => {

    const registry = new CustomElementRegistry;

    const host = document.body.appendChild(document.createElement('div'));

    const shadowRoot = host.attachShadow({mode: 'closed', customElements: registry});

    assert_equals(shadowRoot.customElements, registry);

}, 'A newly attached connected ShadowRoot should use the scoped registry if explicitly specified in attachShadow');

test(() => {

    const host = document.body.appendChild(document.createElement('div'));

    host.attachShadow({mode: 'closed', customElements: null});

}, 'attachShadow() should not throw for a null customElements value');

</script>

</body>

</html>