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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 MyElement extends HTMLElement {}
class MyElement2 extends w.HTMLElement {}
customElements.define('my-element', MyElement);
w.customElements.define('my-element', MyElement2);
let original = document.createElement('my-element');
assert_true(original instanceof MyElement);
let imported = doc.importNode(original);
assert_true(imported instanceof MyElement2);
}, 'autonomous: document.importNode() should import custom elements successfully');
test_with_window((w, doc) => {
class MyElement3 extends w.HTMLElement {}
w.customElements.define('my-element3', MyElement3);
let original = document.createElement('my-element3');
assert_equals(original.constructor, HTMLElement);
let imported = doc.importNode(original);
assert_true(imported instanceof MyElement3);
}, 'autonomous: document.importNode() should import "undefined" custom elements successfully');
</script>
</body>
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