content/test/data/accessibility/event/native-spinbutton-arrow-up-changed.html

<!DOCTYPE html>
<html>
<body>
<input id="c" type="number" value="10">
<script>
  function go() {
    const el = document.getElementById('c');
    el.focus();
    el.stepUp();
  }
</script>
</body>
</html>