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chromium/third_party/blink/web_tests/external/wpt/css/css-overflow/scrollbars-chrome-bug-001.html 

<!DOCTYPE html>
<title>CSS Overflow: css-overflow-3</title>
<link rel="author" href="mailto:[email protected]">
<link rel="help" href="https://crbug.com/926167">
<link rel="match" href="scrollbars-chrome-bug-001-ref.html">
<meta name="assert" content="scrollbars keep up to date with a changing transform">
<style>

#container {
  width: 200px;
  height: 150px;
  border: 1px solid black;
  overflow: scroll;
}
#target {
  width: 100px;
  height: 50px;
  background: green;
  transform: scale(1);
}
</style>
<!--  -->
<div id="container">
  <div id="target"></div>
</div>
<script>
  // 1st transform triggers layer creation, and full layout.
  // 2nd transform just updates overflow, which does not update scrollbars.
  // This triggers the bug.
  document.body.offsetTop;
  document.querySelector("#target").style.transform = "scale(1.5)";
  document.body.offsetTop;
  document.querySelector("#target").style.transform = "scale(4.0)";
</script>