position-visibility-no-overflow-scroll.html

<!DOCTYPE html>
<html class="reftest-wait">
<title>CSS Anchor Positioning Test: position-visibility: no-overflow</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-visibility">
<link rel="match" href="position-visibility-no-overflow-scroll-ref.html">
<style>
  #scroll-container {
    position: relative;
    overflow: hidden scroll;
    width: 400px;
    height: 150px;
  }

  .anchor {
    width: 100px;
    height: 100px;
    background: orange;
    display: inline-block;
  }

  .target {
    position: absolute;
    position-visibility: no-overflow;
    width: 100px;
    height: 100px;
  }
</style>

<div id="scroll-container">
  <div class="anchor" style="anchor-name: --a1;">anchor1</div>
  <div class="anchor" style="anchor-name: --a2; position: relative; top: 100px">anchor2</div>
  <div id="target1" class="target" style="position-anchor: --a1; top: anchor(bottom); background: green">target1</div>
  <div id="target2" class="target" style="position-anchor: --a2; left: anchor(left); bottom: anchor(top); background: red">target2</div>
  <div style="height: 300px"></div>
</div>
<script>
requestAnimationFrame(() => {
  requestAnimationFrame(() => {
    document.getElementById('scroll-container').scrollTop = 50;
    document.documentElement.classList.remove('reftest-wait');
  });
});
</script>
</html>

chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/position-visibility-no-overflow-scroll.html