fullscreen-reordering.html

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This WPT test may be referenced by the following Test IDs:
- /fullscreen/api/fullscreen-reordering.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Re-requesting fullscreen doesn't fail but doesn't change order</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="/common/top-layer.js"></script>

<div class="elements">

  <div id="A">Element A</div>

  <div id="B">Element B</div>

</div>

<style>

  .elements > div {

    width: 200px;

    height: 200px;

  #A { background: blue; }

  #B { background: green; }

</style>

<script>

promise_test(async (t) => {

  t.add_cleanup(async () => {

    while (document.fullscreenElement)

      await document.exitFullscreen();

});

  document.onfullscreenerror = () => assert_unreached('fullscreenerror should not happen');

  const A = document.getElementById('A');

  const B = document.getElementById('B');

  assert_true(!isTopLayer(A) && !isTopLayer(B));

  await blessTopLayer(document.body);

  await A.requestFullscreen();

  assert_equals(document.fullscreenElement, A, 'first A request');

  assert_true(isTopLayer(A), 'A top layer');

  await blessTopLayer(A);

  try {

    await B.requestFullscreen();

  } catch (error) {

    assert_unreached('The second call to requestFullscreen rejected - it should be possible to put siblings into fullscreen together');

  assert_equals(document.fullscreenElement, B, 'B request');

  assert_true(isTopLayer(B), 'B top layer');

  assert_true(isTopLayer(A), 'A still top layer');

  await blessTopLayer(B);

  await A.requestFullscreen();

  assert_true(isTopLayer(A), 'A is still top layer');

  assert_true(isTopLayer(B), 'B is still top layer');

  assert_equals(document.fullscreenElement, A, 'A is moved back to the top of the top layer stack');

  assert_equals(document.elementFromPoint(10, 10), A, 'A should be topmost');

  await document.exitFullscreen();

  assert_equals(document.fullscreenElement, B, 'B goes back to being the fullscreen element');

  assert_true(isTopLayer(B), 'B is still top layer');

  assert_false(isTopLayer(A), 'A is no longer top layer');

  await document.exitFullscreen();

  assert_equals(document.fullscreenElement, null, 'Both closed');

  assert_false(isTopLayer(A), 'A is no longer top layer');

  assert_false(isTopLayer(B), 'B is no longer top layer');

}, 'Requesting fullscreen on A, then B, then A');

</script>