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Test Info:

<!DOCTYPE html>
<title>Custom Elements: Upgrading</title>
<meta name="author" title="Ryosuke Niwa" href="">
<meta name="assert" content="Node.prototype.cloneNode should upgrade a custom element">
<link rel="help" href="">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/custom-elements-helpers.js"></script>
<div id="log"></div>
test(function () {
class MyDiv1 extends HTMLDivElement {};
class MyDiv2 extends HTMLDivElement {};
class MyDiv3 extends HTMLDivElement {};
customElements.define('my-div1', MyDiv1, { extends: 'div' });
customElements.define('my-div2', MyDiv2, { extends: 'div' });
let instance = document.createElement('div', { is: 'my-div1'});
assert_true(instance instanceof MyDiv1);
instance.setAttribute('is', 'my-div2');
let clone = instance.cloneNode(false);
assert_not_equals(instance, clone);
assert_true(clone instanceof MyDiv1,
'A cloned custom element must be an instance of the custom element even with an inconsistent "is" attribute');
let instance3 = document.createElement('div', { is: 'my-div3'});
assert_false(instance3 instanceof MyDiv3);
instance3.setAttribute('is', 'my-div2');
let clone3 = instance3.cloneNode(false);
assert_not_equals(instance3, clone);
customElements.define('my-div3', MyDiv3, { extends: 'div' });
assert_true(instance3 instanceof MyDiv3,
'An undefined element must be upgraded even with an inconsistent "is" attribute');
assert_true(clone3 instanceof MyDiv3,
'A cloned undefined element must be upgraded even with an inconsistent "is" attribute');
}, 'Node.prototype.cloneNode(false) must be able to clone as a customized built-in element when it has an inconsistent "is" attribute');