21 lines
633 B
HTML
21 lines
633 B
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<title>[[PreventExtensions]] on a WindowProxy object should return false</title>
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<link rel="help" href="https://html.spec.whatwg.org/multipage/window-object.html#windowproxy-preventextensions">
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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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"use strict";
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test(() => {
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assert_throws_js(TypeError, () => {
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Object.preventExtensions(window);
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});
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}, "Object.preventExtensions throws a TypeError");
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test(() => {
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assert_false(Reflect.preventExtensions(window));
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}, "Reflect.preventExtensions returns false");
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</script>
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