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<!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>
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