<!DOCTYPE html>
<title>Remove the child of the fullscreen element</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>
<script src="../trusted-click.js"></script>
<div id="log"></div>
<div id="parent">
  <div></div>
</div>
<script>
  promise_test(async (t) => {
    t.add_cleanup(() => {
      if (document.fullscreenElement) {
        return document.exitFullscreen();
      }
    });
    const parent = document.getElementById("parent");
    await Promise.all([trusted_request(parent), fullScreenChange()]);

    assert_equals(document.fullscreenElement, parent);
    parent.textContent = ""; // removes all children
    // The fullscreen element should not be affected.
    assert_equals(document.fullscreenElement, parent);
    document.onfullscreenchange = t.unreached_func("fullscreenchange event");
    // A fullscreenchange event would be fired after an async section
    // and an animation frame task, so wait until after that.
    await new Promise((resolve) => {
      requestAnimationFrame(resolve);
    });
  });
</script>
