7bce509718
Wheel listeners can mutate layout before the wheel default action runs. The old code kept using the paintable found before dispatch, so a removed or moved scroller could still be treated as the default-action target, and the viewport fallback used pre-dispatch layout state. After dispatch, update layout and hit-test the wheel position again before walking scrollable containing blocks. Fall back to viewport scrolling only after that fresh target fails to consume the delta.
36 lines
690 B
HTML
36 lines
690 B
HTML
<!DOCTYPE html>
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<script src="include.js"></script>
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<style>
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body {
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margin: 0;
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}
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#scroller {
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width: 100px;
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height: 100px;
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overflow: scroll;
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}
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#spacer {
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height: 500px;
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}
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#page-spacer {
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height: 2000px;
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}
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</style>
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<div id="scroller"><div id="spacer"></div></div>
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<div id="page-spacer"></div>
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<script>
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test(() => {
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scroller.addEventListener("wheel", () => {
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scroller.remove();
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document.body.offsetHeight;
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}, { passive: false });
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internals.wheel(50, 50, 0, 100);
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println("PASS");
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println(`window.scrollY: ${window.scrollY}`);
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});
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</script>
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