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<!DOCTYPE html>
<title>Element#requestFullscreen() on the current fullscreen element</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>
<div id="log"></div>
<script>
promise_test(async (t) => {
t.add_cleanup(() => {
if (document.fullscreenElement) return document.exitFullscreen();
});
// Use the body element as the fullscreen element, because the second
// test_driver.bless() call needs to insert a button inside of it, which
// can't be clicked if another element is already fullscreen.
const target = document.body;
// First enter fullscreen.
await test_driver.bless("fullscreen", () => target.requestFullscreen());
assert_equals(document.fullscreenElement, target, "fullscreen element after first request");
// Now request fullscreen again, which should be a no-op.
await test_driver.bless("fullscreen", () => target.requestFullscreen());
assert_equals(document.fullscreenElement, target, "fullscreen element after second request");
});
</script>
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