File: position-sticky-scrolled-remove-sibling.html

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<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos">
<p>Test passes if there is a filled green square, and no scrollbars</p>
<div id="container" style="overflow:auto; width:100px; height:100px; background:red;">
  <div style="position:sticky; top:0; height:100px; background:green;"></div>
  <div id="bigItem" style="height:600px;"></div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  container.scrollTop = 600;
  requestAnimationFrame(()=>{
    requestAnimationFrame(()=>{
      bigItem.style.display = "none";
      test(()=> {
        assert_equals(container.scrollHeight, 100);
      }, "Sticky position and its overflow contribution");
    });
  });
</script>