position-visibility-anchors-visible-chained-002.html

<!DOCTYPE html>
<html class=reftest-wait>
<meta charset="utf-8">
<title>CSS Anchor Positioning Test: position-visibility: anchors-visible</title>
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/7758">
<link rel="match" href="position-visibility-anchors-visible-after-scroll-out-ref.html">
<script src="/common/reftest-wait.js"></script>
<script src="/common/rendering-utils.js"></script>
<style>
  #scroll-container {
    overflow: hidden scroll;
    width: 300px;
    height: 100px;
  }

  #anchor1 {
    anchor-name: --a1;
    width: 100px;
    height: 100px;
    background: orange;
  }

  #chained {
    position-anchor: --a1;
    anchor-name: --a2;
    background: yellow;
  }

  .spacer {
    height: 100px;
  }

  .anchored {
    position-visibility: anchors-visible;
    position-area: bottom;
    width: 100px;
    height: 50px;
    background: red;
    position: absolute;
    top: 0;
    left: 0;
  }

  #target {
    position-anchor: --a2;
  }
</style>

<div id="scroll-container">
  <div id="anchor1">anchor1</div>
  <div class="spacer"></div>
  <div id="chained" class="anchored"></div>
  <div id="target" class="anchored">target</div>
</div>

<script>
  // #target should be initially visible because it is anchored to #anchor2
  // which is chained to #anchor1 and both anchors are visible.
  waitForAtLeastOneFrame().then(() => {
    // Scroll #anchor1 so that it is out of view.
    document.getElementById('scroll-container').scrollTop = 100;

    // #target should now be invisible.
    takeScreenshot();
  });
</script>

chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/position-visibility-anchors-visible-chained-002.html