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Paint transition pseudos on top of everything else in the scope. #56189

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Merged
merged 1 commit into from
Nov 24, 2025
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Merged

Paint transition pseudos on top of everything else in the scope. #56189

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30 changes: 30 additions & 0 deletions css/css-view-transitions/scoped/crashtests/zindex-part.html
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<!DOCTYPE html>
<html class="test-wait">
<head>
<style>

#scope {
position: relative; width: 100px; height: 100px;
background: #ddd; contain: strict;
}
#part {
position: absolute; top: 10px; left: 10px;
width: 80px; height: 80px; background: #8cf;
z-index: 1; view-transition-name: foo;
}

</style>
</head>
<body>
<div id=scope><div id=part></div></div>
<script>

onload = async () => {
t = scope.startViewTransition(() => {});
await t.finished;
document.documentElement.classList.remove('test-wait');
};

</script>
</body>
</html>
32 changes: 32 additions & 0 deletions css/css-view-transitions/scoped/paint-order-ref.html
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<!DOCTYPE html>
<style>
#scope {
position: relative; width: 200px; height: 100px;
background: white; contain: strict;
}
#nonpart1 {
position: absolute; top: 40px; left: 20px;
width: 50px; height: 50px; background: #a4f;
}
#nonpart2 {
position: absolute; top: 20px; left: 30px;
width: 50px; height: 50px; background: #f88;
}
#vt {
position: relative; width: 200px; height: 100px;
top: -100px; background: rgba(0, 0, 0, 0.1);
will-change: transform;
}
#part {
position: absolute; top: 30px; left: 50px;
width: 50px; height: 50px; background: #8cf;
}

</style>
<div id=scope>
<div id=nonpart1></div>
<div id=nonpart2></div>
</div>
<div id=vt>
<div id=part></div>
</div>
57 changes: 57 additions & 0 deletions css/css-view-transitions/scoped/paint-order.html
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<!DOCTYPE html>
<html class=reftest-wait>
<head>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
<link rel="match" href="paint-order-ref.html">
<script src="/common/reftest-wait.js"></script>
<script src="/web-animations/testcommon.js"></script>
<style>

#scope {
position: relative; width: 200px; height: 100px;
background: white; contain: strict;
view-transition-name: none;
}
#part {
position: absolute; top: 10px; left: 10px;
width: 50px; height: 50px; background: #8cf;
z-index: 1; view-transition-name: foo;
}
#higher-nonpart {
position: absolute; top: 20px; left: 30px;
z-index: 2; width: 50px; height: 50px; background: #f88;
}
#lower-nonpart {
position: absolute; top: 40px; left: 20px;
z-index: -1; width: 50px; height: 50px; background: #a4f;
}
::view-transition { background: rgba(0, 0, 0, 0.1); }
::view-transition-group(*) { animation-play-state: paused; }
::view-transition-new(*) {
animation: unset; opacity: 1;
transform: translateX(40px) translateY(20px);
}
::view-transition-old(*) { animation: unset; opacity: 0; }

</style>
</head>
<body>
<div id=scope>
<div id=part></div>
<div id=higher-nonpart></div>
<div id=lower-nonpart></div>
</div>
<script>

const scope = document.querySelector("#scope");
failIfNot(scope.startViewTransition, "Missing element.startViewTransition");

async function runTest() {
await waitForCompositorReady();
scope.startViewTransition(() => requestAnimationFrame(takeScreenshot));
}
onload = () => runTest();

</script>
</body>
</html>