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29 lines
1.1 KiB
HTML
29 lines
1.1 KiB
HTML
<!DOCTYPE html>
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<title>Shadow DOM: Attaching a ShadowRoot for custom elements</title>
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<meta name="author" title="Hayato Ito" href="mailto:hayato@chromium.org">
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<link rel="help" href="https://dom.spec.whatwg.org/#dom-element-attachshadow">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script>
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class MyAutonomousCustomElement extends HTMLElement {
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}
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customElements.define('my-custom', MyAutonomousCustomElement);
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test(() => {
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assert_true(document.createElement('my-custom').attachShadow({mode: "open"}) instanceof ShadowRoot);
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}, 'Element.attachShadow must create an instance of ShadowRoot for autonomous custom elements');
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class MyCustomizedBuiltinElement extends HTMLInputElement {
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}
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customElements.define('my-input', MyCustomizedBuiltinElement, { extends: 'input' });
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test(() => {
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assert_throws({'name': 'NotSupportedError'}, () => {
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document.createElement('input', {is: 'my-input'}).attachShadow({mode: "open"});
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});
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}, 'Element.attachShadow must throw a NotSupportedError for customized built-in elements');
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</script>
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</body>
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</html>
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