mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-04-26 01:35:08 +02:00
229eba9a06
Implement the containing block chain traversal in compute_intersection (steps 2-3 of the spec algorithm). Walk from the target's paintable box up through the containing block chain, clipping the intersection rect against each ancestor that has a content clip (overflow != visible). This fixes the case where a target is inside an overflow:hidden or overflow:clip container and pushed below the visible area. Previously, the intersection ratio was incorrectly non-zero because we only intersected with the root bounds (viewport), not intermediate scroll containers. Also update the scroll container clipping tests to verify the intersection ratio (which is what compute_intersection affects) rather than isIntersecting (which per spec is based on targetRect vs rootBounds, not the clipped intersection rect).
48 lines
1.3 KiB
HTML
48 lines
1.3 KiB
HTML
<!DOCTYPE html>
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<style>
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body { margin: 0; }
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#scroller {
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width: 200px;
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height: 200px;
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overflow: hidden;
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}
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#spacer {
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height: 500px;
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}
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#target {
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width: 50px;
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height: 50px;
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background: red;
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}
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</style>
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<script src="../include.js"></script>
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<div id="scroller">
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<div id="spacer"></div>
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<div id="target"></div>
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</div>
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<script>
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asyncTest(done => {
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// The target is inside a scroll container with overflow:hidden.
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// The spacer pushes the target below the scroll container's visible area.
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// With the implicit root (viewport), the intersection ratio should be 0
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// because compute_intersection clips against the scroll container.
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let callbackCount = 0;
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let observer = new IntersectionObserver(entries => {
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callbackCount++;
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entries.forEach(entry => {
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println(`callback ${callbackCount}: ratio=${entry.intersectionRatio}`);
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});
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if (callbackCount === 1) {
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requestAnimationFrame(() => {
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requestAnimationFrame(() => {
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println(`total callbacks: ${callbackCount}`);
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done();
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});
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});
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}
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});
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observer.observe(document.getElementById("target"));
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});
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</script>
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