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Test Info:

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="container"></div>
test(() => {
class MyParagraph extends HTMLParagraphElement {}
customElements.define('my-p', MyParagraph, { extends: 'p' });
let p = new MyParagraph();
p.setAttribute('class', 'foo');
assert_equals(p.outerHTML, '<p is="my-p" class="foo"></p>');
let container = document.querySelector('#container');
container.innerHTML = container.innerHTML;
assert_not_equals(container.firstChild, p);
assert_true(container.firstChild instanceof MyParagraph);
}, '"is" value should be serialized if the custom element has no "is" content attribute');
test(() => {
let p = document.createElement('p', { is: 'your-p' });
assert_equals(p.outerHTML, '<p is="your-p"></p>');
}, '"is" value should be serialized even for an undefined element');
test(() => {
class MyDiv extends HTMLDivElement {}
customElements.define('my-div', MyDiv, { extends: 'div' });
let div = document.createElement('div', { is: 'my-div' });
div.setAttribute('is', 'foo"bar\n');
assert_equals(div.outerHTML, '<div is="foo&quot;bar\n"></div>');
}, '"is" content attribute should be serialized even if the element is a customized built-in element');