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