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