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<!DOCTYPE html>
<title>
Element#requestFullscreen() for top element in 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="top"></div>
<script>
promise_test(async function (t) {
const top = document.getElementById("top");
document.onfullscreenerror = t.unreached_func("fullscreenerror event");
await Promise.all([
trusted_request(top),
new Promise((r) =>
document.addEventListener("fullscreenchange", r)
),
]);
assert_equals(document.fullscreenElement, top);
await trusted_click(top);
await top.requestFullscreen();
// A fullscreenerror event would be fired after an async section
// and an animation frame task, so wait until after that.
await new Promise((resolve) => {
t.step_timeout(() => {
requestAnimationFrame(resolve);
});
});
});
</script>
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