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chromium/third_party/blink/web_tests/external/wpt/css/cssom-view/long_scroll_composited-ref.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Long scrolling should work properly</title>
<link rel="author" href="mailto:[email protected]">



<style>
.post {
  height: 1000px;
  width: 300px;
  border: 1px solid black;

}
.before {
  height: 213px;
  border-top: 0;
}
.scroller {
  overflow-y: scroll;
  width: 500px;
  height: 500px;
  will-change: transform;
}
::-webkit-scrollbar {
  display: none;
}
</style>

<p>The number 7 should be visible in the scrolled window below.</p>

<div id="scroller" class="scroller">
  <div style="position: relative;">
    <div style="position: relative;">
      <div class="post before"></div>
      <div class="post">7</div>
    </div>
  </div>
</div>