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diff --git a/testing/web-platform/tests/custom-elements/HTMLElement-attachInternals.html b/testing/web-platform/tests/custom-elements/HTMLElement-attachInternals.html
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+++ b/testing/web-platform/tests/custom-elements/HTMLElement-attachInternals.html
@@ -0,0 +1,82 @@
+<!DOCTYPE html>
+<body>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" content="https://html.spec.whatwg.org/multipage/custom-elements.html#dom-attachinternals">
+<div id="container"></div>
+<script>
+test(() => {
+ class MyElement1 extends HTMLElement {
+ }
+ customElements.define('my-element1', MyElement1);
+ const container = document.querySelector('#container');
+
+ let element = new MyElement1();
+ assert_true(element.attachInternals() instanceof ElementInternals,
+ 'New - 1st call');
+ assert_throws_dom('NotSupportedError', () => { element.attachInternals(); },
+ 'New - 2nd call');
+
+ element = document.createElement('my-element1');
+ assert_true(element.attachInternals() instanceof ElementInternals,
+ 'createElement - 1st call');
+ assert_throws_dom('NotSupportedError', () => { element.attachInternals(); },
+ 'createElement - 2nd call');
+
+ container.innerHTML = '<my-element1></my-element1>';
+ assert_true(container.firstChild.attachInternals() instanceof ElementInternals,
+ 'Parser - 1st call');
+ assert_throws_dom('NotSupportedError', () => {
+ container.firstChild.attachInternals();
+ }, 'Parser - 2nd call');
+}, 'Successful attachInternals() and the second call.');
+
+test(() => {
+ class MyDiv extends HTMLDivElement {}
+ customElements.define('my-div', MyDiv, { extends: 'div' });
+ const customizedBuiltin = document.createElement('div', { is: 'my-div'});
+ assert_throws_dom('NotSupportedError', () => { customizedBuiltin.attachInternals() });
+}, 'attachInternals() throws a NotSupportedError if it is called for ' +
+ 'a customized built-in element');
+
+test(() => {
+ const builtin = document.createElement('div');
+ assert_throws_dom('NotSupportedError', () => { builtin.attachInternals() });
+
+ const doc = document.implementation.createDocument('foo', null);
+ const span = doc.appendChild(doc.createElementNS('http://www.w3.org/1999/xhtml', 'html:span'));
+ assert_true(span instanceof HTMLElement);
+ assert_throws_dom('NotSupportedError', () => { span.attachInternals(); });
+
+ const undefinedCustom = document.createElement('undefined-element');
+ assert_throws_dom('NotSupportedError', () => { undefinedCustom.attachInternals() });
+}, 'If a custom element definition for the local name of the element doesn\'t' +
+ ' exist, throw an NotSupportedError');
+
+test(() => {
+ class MyElement2 extends HTMLElement {
+ static get disabledFeatures() { return ['internals']; }
+ }
+ customElements.define('my-element2', MyElement2);
+ const container = document.querySelector('#container');
+
+ assert_throws_dom('NotSupportedError', () => {
+ (new MyElement2).attachInternals();
+ });
+ assert_throws_dom('NotSupportedError', () => {
+ document.createElement('my-element2').attachInternals();
+ });
+ assert_throws_dom('NotSupportedError', () => {
+ container.innerHTML = '<my-element2></my-element2>';
+ container.firstChild.attachInternals();
+ });
+
+ class MyElement3 extends HTMLElement {
+ static get disabledFeatures() { return ['INTERNALS']; }
+ }
+ customElements.define('my-element3', MyElement3);
+ assert_true((new MyElement3).attachInternals() instanceof ElementInternals);
+}, 'If a custom element definition for the local name of the element has ' +
+ 'disable internals flag, throw a NotSupportedError');
+</script>
+</body>