Document-importNode-customized-builtins.html

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

<!DOCTYPE html>

<link rel="help" href="https://dom.spec.whatwg.org/#dom-document-importnode">

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

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

<script src="../resources/custom-elements-helpers.js"></script>

<body>

<script>

test_with_window((w, doc) => {

  class MyDiv extends HTMLDivElement {}

  class MyDiv2 extends w.HTMLDivElement {}

  customElements.define('my-div', MyDiv, { extends: 'div' });

  w.customElements.define('my-div', MyDiv2, { extends: 'div' });

  let original = document.createElement('div', { is: 'my-div' });

  assert_true(original instanceof MyDiv);

  let imported = doc.importNode(original);

  assert_true(imported instanceof MyDiv2);

}, 'built-in: document.importNode() should import custom elements successfully');

test_with_window((w, doc) => {

  class MyDiv2 extends w.HTMLDivElement {}

  w.customElements.define('my-div2', MyDiv2, { extends: 'div' });

  let original = document.createElement('div', { is: 'my-div2' });

  assert_equals(original.constructor, HTMLDivElement);

  let imported = doc.importNode(original);

  assert_true(imported instanceof MyDiv2);

}, 'built-in: document.importNode() should import "undefined" custom elements successfully');

</script>

</body>