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<!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>