Document-createElementNS-customized-builtins.html

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This WPT test may be referenced by the following Test IDs:
- /custom-elements/Document-createElementNS-customized-builtins.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Custom Elements: document.createElementNS should support custom elements</title>

<link rel="help" content="https://dom.spec.whatwg.org/#concept-create-element">

<link rel="help" content="https://dom.spec.whatwg.org/#internal-createelementns-steps">

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

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

<body>

<script>

test(() => {

  class MyBuiltinElement extends HTMLElement {};

  customElements.define('my-builtin', MyBuiltinElement, { extends: 'address' });

  let element = document.createElementNS('http://www.w3.org/1999/xhtml', 'p:address', { is: 'my-builtin'});

  assert_true(element instanceof MyBuiltinElement);

  assert_equals(element.prefix, 'p');

  assert_false(element.hasAttribute('is'));

}, 'builtin: document.createElementNS should create custom elements with prefixes.');

test(() => {

  class MyBuiltinElement2 extends HTMLElement {};

  customElements.define('my-builtin2', MyBuiltinElement2, { extends: 'address'});

  let element = document.createElementNS('urn:example', 'address', { is: 'my-builtin2' });

  assert_false(element instanceof MyBuiltinElement2);

  assert_false(element.hasAttribute('is'));

}, 'builtin: document.createElementNS should check namespaces.');

test(() => {

    class SuperP extends HTMLParagraphElement {}

    customElements.define("super-p", SuperP, { extends: "p" });

    const superP = document.createElementNS("http://www.w3.org/1999/xhtml", "p", { is: "super-p" });

    assert_true(superP instanceof HTMLParagraphElement);

    assert_true(superP instanceof SuperP);

    assert_equals(superP.localName, "p");

    const notSuperP = document.createElementNS("http://www.w3.org/1999/xhtml", "p", "super-p");

    assert_true(notSuperP instanceof HTMLParagraphElement);

    assert_false(notSuperP instanceof SuperP);

    assert_equals(notSuperP.localName, "p");

}, "document.createElementNS()'s third argument is to be ignored when it's a string");

</script>

</body>