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Test Info:

<!DOCTYPE html>
<title>Custom Elements: document.createElementNS should support custom elements</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
test(() => {
class MyElement extends HTMLElement {};
customElements.define('my-autonomous', MyElement);
let element = document.createElementNS('http://www.w3.org/1999/xhtml', 'p:my-autonomous');
assert_true(element instanceof MyElement);
assert_equals(element.prefix, 'p');
}, 'autonomous: document.createElementNS should create custom elements with prefixes.');
test(() => {
class MyElement2 extends HTMLElement {};
customElements.define('my-autonomous2', MyElement2);
let element = document.createElementNS('urn:example', 'my-autonomous2');
assert_false(element instanceof MyElement2);
}, 'autonomous: document.createElementNS should check namespaces.');
test(() => {
const xhtmlNS = 'http://www.w3.org/1999/xhtml';
assert_false(document.createElementNS(xhtmlNS, 'x-foo') instanceof HTMLUnknownElement);
assert_false(document.createElementNS(xhtmlNS, 'x-foo', {}) instanceof HTMLUnknownElement);
assert_false((new Document()).createElementNS(xhtmlNS, 'x-foo') instanceof HTMLUnknownElement);
assert_false((new Document()).createElementNS(xhtmlNS, 'x-foo', {}) instanceof HTMLUnknownElement);
}, 'autonomous: document.createElementNS should not create HTMLUnknownElement for a valid custom element name');
test(() => {
class MyElement3 extends HTMLElement {};
customElements.define('my-autonomous3', MyElement3);
const instance = document.createElementNS('http://www.w3.org/1999/xhtml', 'my-autonomous3', undefined);
assert_true(instance instanceof MyElement3);
}, 'autonomous: document.createElementNS with undefined options value should be upgraded.');
</script>
</body>