File: position-visibility-add-no-overflow.html

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<!DOCTYPE html>
<html class=reftest-wait>
<meta charset="utf-8">
<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-ref.html">
<style>
  #scroll-container {
    position: relative;
    overflow: hidden scroll;
    width: 400px;
    height: 100px;
  }

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

  .target {
    position: absolute;
    position-area: block-end;
    width: 100px;
    height: 100px;
    background: red;
    top: 0;
    left: 0;
  }
</style>

<div id="scroll-container">
  <!-- #target1 should not be visible because it overflows the containing block. -->
  <div class="anchor" style="anchor-name: --a1;">anchor1</div>
  <div id="target" class="target" style="position-anchor: --a1;">target1</div>
</div>

<script>
requestAnimationFrame(() => {
  requestAnimationFrame(() => {
    target.style.positionVisibility = 'no-overflow';
    document.documentElement.classList.remove('reftest-wait');
  });
});
</script>
</html>