yield-then-detach.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:
- /scheduler/tentative/yield/yield-then-detach.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>Scheduler: yield in Detached Scheduler</title>

<link rel="help" href="https://github.com/WICG/scheduling-apis">

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

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

<script>

'use strict';

promise_test(async t => {

  await new Promise(resolve => window.onload = resolve);

  const frame = document.body.appendChild(document.createElement('iframe'));

  const iframeDOMException = frame.contentWindow.DOMException;

  const iframeScheduler = frame.contentWindow.scheduler;

  let didRun = false;

  iframeScheduler.yield().then(() => { didRun = true; });

  document.body.removeChild(frame);

  await promise_rejects_dom(t, 'NotSupportedError', iframeDOMException, iframeScheduler.yield());

  await new Promise(resolve => t.step_timeout(resolve, 10));

  assert_false(didRun, 'The continuation should not have run.');

}, 'Test scheduler.yield() from an iframe that is removed');

</script>