<!DOCTYPE html>
<meta charset="utf-8">
<title>window.opener setter throws TypeError if [[DefineOwnProperty]] fails</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/browsers.html#dom-opener">

<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>

<body>
<script>
test(() => {
    Object.defineProperty(window, "opener", { configurable: false });
    assert_throws(new TypeError, () => { window.opener = 1; });

    const desc = Object.getOwnPropertyDescriptor(window, "opener");
    assert_false("value" in desc);
    assert_equals(typeof desc.get, "function");
    assert_equals(typeof desc.set, "function");
    assert_true(desc.enumerable);
    assert_false(desc.configurable);
}, "window.opener setter throws TypeError if called on non-configurable accessor property");
</script>