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chromium/third_party/blink/web_tests/external/wpt/webaudio/the-audio-api/the-offlineaudiocontext-interface/startrendering-after-discard.html 

<!doctype html>
<title>Test for rejected promise from startRendering() on an
  OfflineAudioContext in a discarded browsing context</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<body></body>
<script>
let context;
let childDOMException;
setup(() => {
  const frame = document.createElement('iframe');
  document.body.appendChild(frame);
  context = new frame.contentWindow.OfflineAudioContext(
    {length: 1, sampleRate: 48000});
  childDOMException = frame.contentWindow.DOMException;
  frame.remove();
});

promise_test((t) => promise_rejects_dom(
  t, 'InvalidStateError', childDOMException, context.startRendering()),
             'startRendering()');
// decodeAudioData() is tested in
// offlineaudiocontext-detached-execution-context.html
</script>