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chromium/third_party/blink/web_tests/wpt_internal/css/css-overflow/scroll-marker-005.html 

<!DOCTYPE html>
<title>scroll markers inside out-of-flow</title>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-marker-group">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<style>
  .container {
    scroll-marker-group: before;
    overflow: hidden;
  }
  .container::scroll-marker-group {
    display: flex;
    height: 100px;
  }
  .marker::scroll-marker {
    display: block;
    width: 20px;
    height: 100px;
    content: "";
    background: green;
  }
  .contain_abs {
    position: relative;
  }
  .contain_all {
    contain: layout;
  }
  .uncontained::scroll-marker {
    z-index: 100;
    content: "ERROR";
    background: red;
  }
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div class="container">
  <div class="marker"></div>
  <div class="marker" class="contain_abs"></div>
  <div style="position:absolute;">
    <div class="uncontained marker"></div>
  </div>
  <div class="contain_all">
    <div class="marker" style="position:fixed;"></div>
  </div>
  <div class="contain_abs">
    <div class="marker"></div>
    <div class="marker" style="position:absolute;"></div>
    <div class="uncontained marker" style="position:fixed;"></div>
  </div>
</div>