anchor-scroll-overflow-hidden.html | Explore in Territory

<!DOCTYPE html>
<title>Basic of anchor positioned scrolling: anchored elements should be "pinned" to the anchor when anchor is scrolled in overflow:hidden</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/">
<link rel="match" href="anchor-scroll-overflow-hidden-ref.html">
<link rel="stylesheet" href="/fonts/ahem.css">
<style>
body {
  font: 20px/1 Ahem;
  margin: 0;
}

#scroll-container {
  width: 400px;
  height: 400px;
  overflow: hidden;
}

#scroll-contents {
  width: 1000px;
  height: 1000px;
}

#placefiller-above-anchor {
  height: 500px;
}

#placefiller-before-anchor {
  display: inline-block;
  width: 500px;
}

#anchor {
  anchor-name: --anchor;
}

#inner-anchored {
  color: green;
  position: absolute;
  left: anchor(left);
  bottom: anchor(top);
  position-anchor: --anchor;
}

#outer-anchored {
  color: yellow;
  position: absolute;
  left: anchor(left);
  top: anchor(bottom);
  position-anchor: --anchor;
}
</style>

<div id="scroll-container">
  <div id="scroll-contents">
    <div id="placefiller-above-anchor"></div>
    <div id="placefiller-before-anchor"></div>
    <span id="anchor">anchor</span>
    <div id="inner-anchored">inner-anchored</div>
  </div>
</div>
<div id="outer-anchored">outer-anchored</div>

<script>
const scroller = document.getElementById('scroll-container');
scroller.scrollTop = 300;
scroller.scrollLeft = 450;
</script>

chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/anchor-scroll-overflow-hidden.html