webkit-scrollbar-viewport-crash.html

<!doctype html>
<title>CSS Test: Custom scrollbars for viewport - moving body to a different document</title>
<style>
  html::-webkit-scrollbar {
    width: 20px;
    background-color: green;
  }
  body::-webkit-scrollbar {
    width: 20px;
    background-color: red;
  }
  .scroll { overflow: scroll }
</style>
<body class="scroll"></body>
<script>
  document.body.offsetTop;
  document.documentElement.classList.toggle("scroll");
  document.body.classList.toggle("scroll");
  let new_doc = document.implementation.createDocument("ns", null);
  let body = document.body;
  body.remove();
  new_doc.adoptNode(body);
</script>

chromium/third_party/blink/web_tests/wpt_internal/css/css-overflow/webkit-scrollbar-viewport-crash.html