File: anchor-scope-scroll.html

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<!DOCTYPE html>
<html>
<title>CSS Anchor Positioning: scroll transforms respect anchor-scope</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#anchor-scope">
<link rel="help" href="https://issues.chromium.org/issues/380234225">
<link rel="match" href="anchor-scope-scroll-ref.html">
<style>
#scroller {
  width: 200px;
  height: 200px;
  overflow-y: hidden;
  border: 1px solid black;
}

#item {
  anchor-scope: --item;
  anchor-name: --item;
  height: 50px;
  background: lightgray;
}

#anchored {
  position-anchor: --item;
  position: absolute;
  background: skyblue;
  right: anchor(right);
  top: anchor(top);
  width: 50px;
  height: 50px;
}

.spacer {
  height: 150px;
}
</style>
<div id=scroller>
  <div class=spacer></div>
  <div id=item>
    <b id=anchored></b>
  </div>
  <div class=spacer></div>
</div>
<!-- This element should *not* affect scroll transforms for #anchored: -->
<div style="anchor-name: --item"></div>
<script>
  scroller.scrollTop = 50;
</script>
</html>