audiocontext-after-unload-1.html

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<!DOCTYPE html>

<html class="reftest-wait">

<head>

<title>Test for bug 1646601</title>

<script>

document.addEventListener('DOMContentLoaded', async () => {

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

  document.body.appendChild(frame);

  frame.srcdoc = '<html></html>';

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

  const subwin = frame.contentWindow;

  const subcontext = subwin.AudioContext;

  // Construct an AudioContext while the subdocument is fully active to start

  // a MediaTrackGraph.

  new subcontext();

  // Unload the subdocument and wait for completion.

  // This shuts down the MediaTrackGraph.

  subwin.location.reload();

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

  // Test that a new AudioContext on the inactive subdocument does not attempt

  // to use the shut-down MediaTrackGraph.

  try { new subcontext() } catch {}

  document.documentElement.removeAttribute('class');

});

</script>

</head>

</html>