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[carousel] Avoid nullptr ::column computed style. #57052

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chromium-wpt-export-bot merged 1 commit into from
Jan 8, 2026
Merged

[carousel] Avoid nullptr ::column computed style. #57052

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52 changes: 52 additions & 0 deletions css/css-overflow/scroll-marker-in-display-none-column-crash.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,52 @@
<!DOCTYPE html>
<html class="test-wait">
<title>Change ::column pseudo-element to display:none dynamically</title>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<link rel="help" href="https://issues.chromium.org/issues/470512590">
<style>
body {
margin: 0;
}
#mc {
overflow: hidden;
scroll-marker-group: before;
columns: 1;
column-fill: auto;
width: 400px;
height: 100px;
}
#mc::scroll-marker-group {
display: flex;
height: 20px;
}
#mc::column::scroll-marker {
width: 20px;
content: "X";
}
#mc:hover::column {
display: none;
}
</style>
<div id="mc">
<!-- Create three columns. -->
<div style="height:300px;"></div>
</div>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script>
async function foo() {
// Hover the second ::column::scroll-marker.
actions_promise = new test_driver.Actions()
.pointerMove(30, 10)
.send();
await actions_promise;
document.body.offsetTop;
mc.style.width = "401px";
document.body.offsetTop;
document.documentElement.classList.remove("test-wait");
}
document.body.offsetTop;
foo();
</script>
</html>