position-absolute-dynamic-list-marker.html

<!DOCTYPE html>
<html class='reftest-wait'>
<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
<link rel="help" href="https://www.w3.org/TR/css-position-3/" />
<meta name="assert" content="This test checks that a dynamic change in constraints calculates the static position correctly."/>
<script src="/common/reftest-wait.js"></script>
<style>
ul {
  margin: 0;
  padding: 0;
  width: 100px;
  height: 100px;
  background: red;
}

#target {
  position: absolute;
  width: 100px;
  height: 100px;
  background: green;
}
::marker { color: white; }
</style>
<p>Test passes if there is a filled green square.</p>
<ul>
  <li style="position: relative;">
    <div style="height: 50px;"></div>
    <div id=target></div>
  </li>
</ul>
<script>
document.body.offsetTop;
const target = document.getElementById('target');
target.style.top = '0px';
document.body.offsetTop;
takeScreenshot();
</script>

chromium/third_party/blink/web_tests/external/wpt/css/css-position/position-absolute-dynamic-list-marker.html