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layout: Offset scrollable overflow hit test item by containing block #57037

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servo-wpt-sync merged 2 commits into from
Jan 9, 2026
Merged

layout: Offset scrollable overflow hit test item by containing block #57037

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c763b1e
Add testdriver WPTs
stevennovaryo Jan 9, 2026
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stevennovaryo Jan 9, 2026
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51 changes: 51 additions & 0 deletions css/css-overflow/overflow-auto-scrolling-with-margins.html
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Original file line number Diff line number Diff line change
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<!doctype html>
<title>Should be able to interactively scroll an overflow: auto element with a margin</title>
<link rel="help" href="https://github.com/servo/servo/pull/41707">
<link rel="author" title="Jo Steven Novaryo" href="mailto:[email protected]">
<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="/resources/testdriver-actions.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<style>
#scroller {
display: block;
margin-top: 200px;
margin-left: 200px;
width: 50px;
height: 50px;
background-color: red;
overflow: auto;
scrollbar-width: none;
}
#item {
position: relative;
top: 50px;
left: 50px;
width: 50px;
height: 50px;
background-color: green;
}
</style>
<div id="scroller">
<div id="item">
</div>
</div>

<script>
promise_test(async (t) => {
await waitForCompositorCommit();
let rect = scroller.getBoundingClientRect();
const actions = new test_driver.Actions().scroll(rect.left + 10, rect.top + 10, 1000, 1000);
actions.send();

let scroll_delta_promise = new Promise((resolve) => {
scroller.addEventListener("scroll", () => resolve([scroller.scrollLeft, scroller.scrollTop]));
});

let [horizontal_delta, vertical_delta] = await scroll_delta_promise;
assert_equals(horizontal_delta, 50, "Element scrolled horizontally");
assert_equals(vertical_delta, 50, "Element scrolled vertically");
}, "Margins should not interfere with interactive scrolling of a scroll container");
</script>