position-sticky-overflow-clip-container.html

<!DOCTYPE html>
<html>
<title>Sticky elements should not consider overflow: clip containers as possible scroll ancestor</title>
<link rel="match" href="position-sticky-overflow-clip-container-ref.html" />
<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" />
<meta name="assert" content="This test checks that sticky elements do not consider overflow:clip containers as possible scroll ancestor"/>
<style>
body {
  margin: 0;
  overflow: hidden; /* hide scrollbars */
}

#container {
  height: 300px;
  overflow: auto;
}

#overflowClipContainer {
  overflow: clip;
  height: 600px;
}

#sticky {
  position: sticky;
  top: 0;
  height: 50px;
  background-color: yellow;
}
</style>
<script>
function doTest()
{
  container.scrollTo(0, 50);
}
window.addEventListener('load', doTest, false);
</script>
<div id="container">
  <div id="overflowClipContainer">
    <div id="sticky"></div>
  </div>
</div>

chromium/third_party/blink/web_tests/external/wpt/css/css-position/sticky/position-sticky-overflow-clip-container.html