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Add a test for fullscreen for the A/B/A case
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See the discussion at [1] for more context. This test requests
fullscreen on A, then B, then A, where A and B are sibling divs.
All three requests should succeed, but at the end, B should be
left topmost (and the fullscreen element) but both A and B
should be in the top layer.

[1] whatwg/fullscreen#223

Change-Id: I3f35dda5b9eb1bc24201616bb5bb4949d20fd170
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mfreed7 authored and chromium-wpt-export-bot committed May 3, 2023
1 parent e643f91 commit ebc90b1
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63 changes: 63 additions & 0 deletions fullscreen/api/fullscreen-reordering.html
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<!DOCTYPE html>
<title>Re-requesting fullscreen doesn't fail but doesn't change order</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 class="elements">
<div id="A">Element A</div>
<div id="B">Element B</div>
</div>

<style>
.elements>div {
width:200px;
height:200px;
}
#A { background: blue; }
#B { background: green; }
}
</style>

<script>
function isTopLayer(el) {
return getComputedStyle(el, '::backdrop').right !== 'auto';
}

promise_test(async (t) => {
t.add_cleanup(async () => {
if (document.fullscreenElement)
await document.exitFullscreen();
});
document.onfullscreenerror = t.unreached_func('fullscreenerror should not happen');
const A = document.getElementById('A');
const B = document.getElementById('B');
assert_true(!isTopLayer(A) && !isTopLayer(B));
await trusted_click(document.body);
await A.requestFullscreen();
assert_equals(document.fullscreenElement,A,'first A request');
assert_true(isTopLayer(A),'A top layer');
await trusted_click(A);
await B.requestFullscreen();
assert_equals(document.fullscreenElement,B,'B request');
assert_true(isTopLayer(B),'B top layer');
assert_true(isTopLayer(A),'A still top layer');
await trusted_click(B);
await A.requestFullscreen();
assert_true(isTopLayer(A),'A is still top layer');
assert_true(isTopLayer(B),'B is still top layer');
assert_equals(document.fullscreenElement,B,'B is still the fullscreen element');
assert_equals(document.elementFromPoint(10,10),B,'B should be topmost');

await document.exitFullscreen();
assert_equals(document.fullscreenElement,A,'A goes back to being the fullscreen element');
assert_true(isTopLayer(A),'A is still top layer');
assert_false(isTopLayer(B),'B is no longer top layer');
await document.exitFullscreen();
assert_equals(document.fullscreenElement,null,'Both closed');
assert_false(isTopLayer(A),'A is no longer top layer');
assert_false(isTopLayer(B),'B is no longer top layer');
}, 'Requesting fullscreen on A, then B, then A doesn\'t throw, but leaves B topmost');
</script>

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