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chromium/third_party/blink/web_tests/external/wpt/css/css-position/position-relative-004.html 

<!DOCTYPE html>
<link rel="help" href="https://crbug.com/1058690">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<meta name="assert" content="A percent inset resolves against the available size when it dynamically changes.">
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="target" style="contain: paint; width: 100px; background: red; line-height: 0;">
  <span style="position: relative; top: -100%;">
    <span style="position: relative; top: 100px;">
      <div style="position: fixed; width: 100px; height: 100px; background: green;"></div>
    </span>
  </span>
</div>
<script>
document.body.offsetTop;
document.getElementById('target').style.height = '100px';
</script>