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<!DOCTYPE html>
<html class="reftest-wait">
<title>Tests that anchored element should update location after scroll offset changes caused by scroll content resizing</title>
<link rel="author" href="mailto:xiaochengh@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/">
<link rel="match" href="reference/anchor-scroll-update-006-ref.html">
<style>
#cb {
position: absolute;
inset: 0;
}
#scroller {
margin-top: 300px;
overflow-y: scroll;
height: 100px;
}
#spacer { height: 400px; }
#spacer.changed { height: 300px; }
#anchor { anchor-name: --a; }
#anchored {
position: absolute;
width: 100px;
height: 100px;
background-color: green;
top: anchor(top);
left: 0;
position-anchor: --a;
position-visibility: always;
}
</style>
<div id="cb">
<div id="scroller">
<div id="anchor"></div>
<div id="spacer"></div>
</div>
<div id="anchored"></div>
</div>
<script>
function raf() {
return new Promise(resolve => requestAnimationFrame(resolve));
}
async function runTest() {
const scroller = document.getElementById('scroller');
scroller.scrollTop = 300;
await raf();
await raf();
document.getElementById('spacer').classList.add('changed');
document.documentElement.classList.remove('reftest-wait');
// Should change scroll offset and scroll adjustment to 200.
}
runTest();
</script>
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