remove-single.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /fullscreen/model/remove-single.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Remove the single element on the fullscreen element stack</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="single"></div>

<script>

  promise_test(async (t) => {

    t.add_cleanup(() => {

      if (document.fullscreenElement) {

        return document.exitFullscreen();

});

    const single = document.getElementById("single");

    const [, event] = await Promise.all([

      trusted_request(single),

      fullScreenChange(),

]);

    assert_equals(document.fullscreenElement, single);

    assert_equals(event.target, single);

    single.remove();

    // Because /single/ was removed from the top layer, the fullscreen

    // element becomes null synchronously.

    assert_equals(document.fullscreenElement, null);

    const secondEvent = await fullScreenChange();

    assert_equals(document.fullscreenElement, null);

    assert_equals(event.target, single);

});

</script>