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chromium/third_party/blink/web_tests/external/wpt/webaudio/the-audio-api/the-audiocontext-interface/constructor-allowed-to-start.html 

<!doctype html>
<title>AudioContext state around "allowed to start" in constructor</title>
<link rel=help href=https://webaudio.github.io/web-audio-api/#dom-audiocontext-audiocontext>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=/resources/testdriver.js></script>
<script src=/resources/testdriver-vendor.js></script>
<script>
setup({ single_test: true });
test_driver.bless("audio playback", () => {
  const ctx = new AudioContext();
  // Immediately after the constructor the state is "suspended" because the
  // control message to start processing has just been sent, but the state
  // should change soon.
  assert_equals(ctx.state, "suspended", "initial state");
  ctx.onstatechange = () => {
    assert_equals(ctx.state, "running", "state after statechange event");
    // Now create another context and ensure it starts out in the "suspended"
    // state too, ensuring it's not synchronously "running".
    const ctx2 = new AudioContext();
    assert_equals(ctx2.state, "suspended", "initial state of 2nd context");
    done();
  };
});
</script>