Event-timestamp-cross-realm-getter.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /dom/events/Event-timestamp-cross-realm-getter.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<title>event.timeStamp is initialized using event's relevant global object</title>

<link rel="help" href="https://dom.spec.whatwg.org/#ref-for-dom-event-timestamp%E2%91%A1">

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

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

<body>

<script>

const t = async_test();

t.step_timeout(() => {

  const iframeDelayed = document.createElement("iframe");

  iframeDelayed.onload = t.step_func_done(() => {

    // Use eval() to eliminate false-positive test result for WebKit builds before r280256,

    // which invoked WebIDL accessors in context of lexical (caller) global object.

    const timeStampExpected = iframeDelayed.contentWindow.eval(`new Event("foo").timeStamp`);

    const eventDelayed = new iframeDelayed.contentWindow.Event("foo");

    const {get} = Object.getOwnPropertyDescriptor(Event.prototype, "timeStamp");

    assert_approx_equals(get.call(eventDelayed), timeStampExpected, 5, "via Object.getOwnPropertyDescriptor");

    Object.setPrototypeOf(eventDelayed, Event.prototype);

    assert_approx_equals(eventDelayed.timeStamp, timeStampExpected, 5, "via Object.setPrototypeOf");

});

  document.body.append(iframeDelayed);

}, 1000);

</script>