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<!doctype html>
<title>CSS Container Queries Test: scrollbar stability for @container queries and overflow:auto</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#container-queries">
<link rel="help" href="https://drafts.csswg.org/css-overflow-3/#scrollbar-layout">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
#scroller {
height: 100px;
width: 100px;
overflow-y: auto;
}
#container {
container-type: inline-size;
}
#inner {
height: 100px;
border-bottom: 1px solid red;
}
@container (max-width: 99px) {
#inner {
height: 50px;
}
}
</style>
<div id="precondition" style="width:100px;height:100px;overflow:scroll"></div>
<div id="scroller">
<div id="container">
<div id="inner"></div>
</div>
</div>
<script>
setup(() => {
assert_implements_container_queries();
assert_implements_optional(precondition.clientWidth < 100,
"Tests do not work with overlay scrollbars");
});
let initialScrollerWidth = scroller.clientWidth;
test(() => {
assert_equals(getComputedStyle(inner).height, "50px",
"Layout with a scrollbar means the container query applies");
}, "Initial layout - expecting a scrollbar without overflowing content instead of overflowing content without a scrollbar");
test(() => {
inner.style.borderBottomWidth = "2px";
assert_equals(scroller.clientWidth, initialScrollerWidth, "Scrollbar visibility is consistent after reflow.");
assert_equals(getComputedStyle(inner).height, "50px",
"Layout with a scrollbar means the container query applies");
}, "Same result after a reflow");
</script>
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