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<!DOCTYPE html>
<title>Tests anchor positioned scrolling with fragmented containing block</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#scroll">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/test-common.js"></script>
<style>
body {
margin: 0;
}
#multicol {
column-count: 3;
column-width: 90px;
column-gap: 10px;
width: 300px;
height: 100px;
}
#cb {
height: 300px;
background: yellow;
position: relative;
}
#spacer {
height: 110px;
}
#scroller {
overflow-y: scroll;
height: 80px;
background: blue;
}
#anchor {
anchor-name: --a;
width: 50px;
height: 50px;
background: orange;
position: relative;
top: 80px;
}
#target {
position: absolute;
left: anchor(left);
bottom: anchor(top);
position-anchor: --a;
width: 50px;
height: 50px;
background: lime;
}
</style>
<div id=multicol>
<div id=cb>
<div id=spacer></div>
<div id=scroller>
<div id=anchor></div>
</div>
<div id=target></div>
</div>
</div>
<script>
promise_test(async () => {
scroller.scrollTop = 10;
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
let targetRect = target.getBoundingClientRect();
assert_equals(targetRect.top, 30);
}, 'Scrolling should work in fragmented containing block');
</script>
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