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[IntersectionObserver] Fix occlusion detection with 3D transform #59807

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chromium-wpt-export-bot merged 1 commit into from
May 12, 2026
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[IntersectionObserver] Fix occlusion detection with 3D transform #59807

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61 changes: 61 additions & 0 deletions intersection-observer/v2/3d-transform-occlusion.html
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<meta name="viewport" content="width=device-width,initial-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>
body {
transform-style: preserve-3d;
}
div {
position: absolute;
width: 100px;
height: 100px;
}
#target1, #target2 {
background: green;
}
#target2 {
left: 150px;
}
#occluder {
background: red;
transform: translateZ(-10px) rotateY(30deg);
transform-origin: center;
}
#behind {
left: 150px;
background: red;
transform: translateZ(-10px) rotateY(10deg);
transform-origin: center;
}
</style>

<div id=occluder></div>
<div id=target1></div>

<div id=behind></div>
<div id=target2></div>

<script>
promise_test(() => {
return Promise.all([
new Promise((resolve, reject) => {
const target = document.getElementById("target1");
new IntersectionObserver(entries => {
// part of #occluder is visible above #target1
assert_false(entries[0].isVisible);
resolve();
}, {trackVisibility:true, delay:100}).observe(target);
}),
new Promise((resolve, reject) => {
const target = document.getElementById("target2");
new IntersectionObserver(entries => {
// #behind is entirely behind #target2
assert_true(entries[0].isVisible);
resolve();
}, {trackVisibility:true, delay:100}).observe(target);
})
]);
}, "Intersection observer V2 test with occlusion by an element with a 3D transform.");
</script>
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