chromium/third_party/blink/web_tests/external/wpt/css/css-position/position-absolute-dynamic-relayout-004.html

<!DOCTYPE html>
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1493929">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div style="width:100px; height:100px; background:red;">
  <div style="float:left; width:100px;">
    <div id="target1" style="height:10px; background:green;"></div>
  </div>
  <div>
    <div style="float:left; position:relative; width:100px; height:50px; background:green;">
      <div id="target2" style="position:absolute; width:10px; height:10px;"></div>
    </div>
  </div>
</div>
<script>
document.body.offsetTop;
target2.style.width = '20px';
document.body.offsetTop;
target1.style.height = '50px';
</script>