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<!DOCTYPE html>
<title>Basic of anchor positioned scrolling: scroll of a scrollable anchor should not affect anchor positioing</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/">
<link rel="match" href="anchor-scroll-scrollable-anchor-ref.html">
<style>
#scroll-container {
width: 400px;
height: 400px;
overflow: scroll;
will-change: scroll-position;
}
#scroll-contents {
width: 1000px;
height: 1000px;
position: relative;
}
.placefiller {
height: 500px;
}
#anchor {
anchor-name: --anchor;
height: 100px;
width: 100px;
overflow: scroll;
will-change: scroll-position;
}
#anchored {
background: green;
position: absolute;
width: 100px;
height: 100px;
left: anchor(left);
bottom: anchor(top);
position-anchor: --anchor;
}
</style>
<div id="scroll-container">
<div id="scroll-contents">
<div class="placefiller"></div>
<div id="anchor">
<div class="placefiller"></div>
</div>
</div>
</div>
<div id="anchored"></div>
<script>
document.getElementById('scroll-container').scrollTop = 300;
document.getElementById('anchor').scrollTop = 300;
</script>
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