outdent-indent-inserthorizontalrule-on-selectionchange.html

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script>
var count = 0;
document.addEventListener("DOMContentLoaded", () => {
  document.onselectionchange = () => {
    document.execCommand("outdent");
    document.execCommand("indent");
    document.execCommand("insertHorizontalRule");
    if (count++ == 10) {
      document.onselectionchange = null;
    }
  };
  find("A");
});
</script>
</head>
<body><isindex contenteditable>
A
</body>
</html>

chromium/third_party/blink/web_tests/external/wpt/editing/crashtests/outdent-indent-inserthorizontalrule-on-selectionchange.html