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<!DOCTYPE html>
<html>
<head>
<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
test(() => {
assert_equals(document.customElementRegistry, window.customElements);
}, 'customElementRegistry on a document should return window.customElements by default');
test(() => {
const doc = document.implementation.createHTMLDocument('foo')
assert_equals(doc.customElementRegistry, null);
}, 'customElementRegistry on a document without a browsing context should return null');
test((t) => {
const frame = document.createElement('iframe');
t.add_cleanup(() => frame.remove());
document.body.appendChild(frame);
assert_equals(frame.contentDocument.customElementRegistry, frame.contentWindow.customElements);
}, 'customElementRegistry on a document of a connected iframe should return contentWindow.customElements');
test((t) => {
const frame = document.createElement('iframe');
document.body.appendChild(frame);
const doc = frame.contentDocument;
const registry = frame.contentWindow.customElements;
frame.remove();
assert_equals(doc.customElementRegistry, registry);
}, 'customElementRegistry on a document of a disconnected iframe should return contentWindow.customElements');
</script>
</body>
</html>