servo/tests/wpt/web-platform-tests/fullscreen/api/element-request-fullscreen-twice-manual.html

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HTML

<!DOCTYPE html>
<title>Element#requestFullscreen() twice</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../trusted-click.js"></script>
<div id="log"></div>
<script>
async_test(t => {
const div = document.querySelector("div");
document.onfullscreenchange = t.step_func(() => {
assert_equals(document.fullscreenElement, div);
// Done, but ensure that there's only one fullscreenchange event.
document.onfullscreenchange = t.unreached_func("second fullscreenchange event");
step_timeout(t.step_func_done());
});
document.onfullscreenerror = t.unreached_func("fullscreenerror event");
trusted_click(t, () => {
// Request fullscreen twice.
div.requestFullscreen();
assert_equals(document.fullscreenElement, null, "fullscreenElement after first requestFullscreen()");
div.requestFullscreen();
assert_equals(document.fullscreenElement, null, "fullscreenElement after second requestFullscreen()");
}, document.body);
});
</script>