relpos-percentage-top-in-scrollable.html

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<link rel="help" href="https://www.w3.org/TR/CSS22/visuren.html#propdef-top">
<link rel="help" href="https://www.w3.org/TR/CSS22/visuren.html#relative-positioning">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=908083">
<p>There should be a green square below.</p>
<div style="position:relative; width:200px; height:200px;">
  <div id="container" style="overflow:hidden; position:absolute; top:0; left:0; bottom:0; right:0;">
    <div style="position:relative; top:100%; width:100px; height:100px; background:green;"></div>
  </div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  container.scrollTop = 123456;
  test(()=> {
      assert_equals(container.scrollTop, 100);
  }, "Top percentage resolved correctly for overflow contribution");
</script>

chromium/third_party/blink/web_tests/external/wpt/css/CSS2/positioning/relpos-percentage-top-in-scrollable.html