document-picture-in-picture/clears-session-on-close.https.html

<!DOCTYPE html>
<title>Test that documentPictureInPicture.window
  is cleared when the PiP window in closed.</title>
<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>
<body>
<script>
async_test((t) => {
  test_driver.bless('request PiP window').then(t.step_func(_ => {
    documentPictureInPicture.requestWindow().then( () => {
      const pipWindow = documentPictureInPicture.window;
      assert_true(!!pipWindow, "pipWindow should exist with PiP is opened");
      pipWindow.addEventListener('unload', () => {
        // `window` is still set until event processing is complete.
        scheduler.postTask(t.step_func_done( () => {
          assert_true(!documentPictureInPicture.window,
                      "window should be cleared when PiP is closed");
        }))
      });
      pipWindow.close();
    });
  }));
});
</script>
</body>