61 lines
2.2 KiB
HTML
61 lines
2.2 KiB
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<body>
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<script>
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"use strict";
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test(() => {
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class SomeElement1 extends HTMLElement {}
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customElements.define("some-element-1", SomeElement1);
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const savedCustomElements = Object.getOwnPropertyDescriptor(window, "customElements");
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Object.defineProperty(window, "customElements", { value: {}, configurable: true });
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const element = document.createElement("some-element-1");
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assert_true(element instanceof SomeElement1);
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Object.defineProperty(window, "customElements", savedCustomElements);
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}, "Custom elements can still be created after `window.customElements` is overwritten.");
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test(() => {
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class SomeElement2 extends HTMLElement {}
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customElements.define("some-element-2", SomeElement2);
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const savedCustomElements = Object.getOwnPropertyDescriptor(window, "customElements");
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Object.defineProperty(window, "customElements", { value: {}, configurable: true });
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const element = new SomeElement2();
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assert_true(element instanceof SomeElement2);
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Object.defineProperty(window, "customElements", savedCustomElements);
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}, "Custom elements can still be constructed after `window.customElements` is overwritten.");
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test(() => {
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class SomeElement3 extends HTMLElement {}
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customElements.define("some-element-3", SomeElement3);
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const savedCustomElements = Object.getOwnPropertyDescriptor(window, "customElements");
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delete window.customElements;
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const element = document.createElement("some-element-3");
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assert_true(element instanceof SomeElement3);
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Object.defineProperty(window, "customElements", savedCustomElements);
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}, "Custom elements can still be created after `window.customElements` is deleted.");
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test(() => {
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class SomeElement4 extends HTMLElement {}
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customElements.define("some-element-4", SomeElement4);
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const savedCustomElements = Object.getOwnPropertyDescriptor(window, "customElements");
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delete window.customElements;
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const element = new SomeElement4();
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assert_true(element instanceof SomeElement4);
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Object.defineProperty(window, "customElements", savedCustomElements);
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}, "Custom elements can still be constructed after `window.customElements` is deleted.");
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</script>
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