restriction-web-audio.html | Explore in Territory

<!DOCTYPE html>
<!-- This cannot be upstreamed as a WPT test because the autoplay policy to
     permit AudioContext to start without user gesture is implementation defined
     behavior, and other browsers just suspend the playback for lack of user
     gestures while prerendering. -->
<title>Same-origin prerendering cannot start AudioContext even with the autoplay policy</title>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/utils.js"></script>
<script src="/speculation-rules/prerender/resources/utils.js"></script>

<body>
  <script>

    promise_test(async t => {
      const uid = token();
      const channel = new PrerenderChannel('prerender-channel', uid);
      const messageQueue = new BroadcastMessageQueue(
          new PrerenderChannel('result-channel', uid));
      t.add_cleanup(_ => channel.close());

      const url = `resources/web-audio.html?uid=${uid}`;
      window.open(url, '_blank', 'noopener');

      const state_on_prerendering =
          JSON.stringify(await messageQueue.nextMessage());
      assert_equals(state_on_prerendering,
          '{"event":"start","prerendering":true,"audiocontext":"suspended"}');
      channel.postMessage('readyToActivate');
      const state_on_activation =
          JSON.stringify(await messageQueue.nextMessage());
      assert_equals(state_on_activation,
          '{"event":"resume","prerendering":false,"audiocontext":"running"}');
    }, 'prerendering pages should not be able to start AudioContext');

  </script>
</body>
chromium/third_party/blink/web_tests/wpt_internal/prerender/restriction-web-audio.html
