testing/web-platform/tests/css/css-anchor-position/position-visibility-anchors-visible-change-css-visibility.html


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<!DOCTYPE html>
<html class=reftest-wait>
<meta charset="utf-8">
<meta name="assert" content="Position-visibility: anchors-visible should show an element after an anchor changes from visibility: hidden to visibility: visible." />
<title>CSS Anchor Positioning Test: position-visibility: anchors-visible</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-visibility">
<link rel="match" href="position-visibility-anchors-visible-change-css-visibility-ref.html">
<script src="/common/reftest-wait.js"></script>
<script src="/common/rendering-utils.js"></script>
<style>
  #container {
    visibility: hidden;
  }

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

  #target {
    position-anchor: --a1;
    position-visibility: anchors-visible;
    inset-area: bottom;
    width: 100px;
    height: 100px;
    background: green;
    position: absolute;
    top: 0;
    left: 0;
  }
</style>

<div id="container">
  <div id="anchor">anchor</div>
</div>
<div id="target">target</div>

<script>
  // #target should be initially hidden because it is anchored to #anchor,
  // which is hidden with "visibility: hidden".

  waitForAtLeastOneFrame().then(() => {
    // Change #container to "visibility: visible". #target should become
    // visible again, because #anchor is no longer hidden.
    container.style.visibility = 'visible';
    takeScreenshot();
  });
</script>