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<!DOCTYPE html>
<title>Element#requestFullscreen() on two elements in the same document</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>
<body>
<div id="a"></div>
<div id="b"></div>
</body>
<script>
promise_test(async (t) => {
document.onfullscreenerror = t.unreached_func("fullscreenerror event");
// Request fullscreen on both elements, but in reverse tree order.
const a = document.getElementById("a");
const b = document.getElementById("b");
// Expect two fullscreenchange events, with document.fullscreenElement
// changing in the same order as the requests.
await trusted_click(b);
await Promise.all([b.requestFullscreen(), fullScreenChange()]);
assert_equals(document.fullscreenElement, b);
await trusted_click(b);
await Promise.all([a.requestFullscreen(), fullScreenChange()]);
assert_equals(document.fullscreenElement, a);
}, "Element#requestFullscreen() on two elements in the same document");
</script>
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