chromium/content/test/data/accessibility/event/range-value-step-changed.html

<!--
@WIN-DENY:EVENT_OBJECT_FOCUS*
@UIA-WIN-DENY:AutomationFocusChanged*
-->
<!DOCTYPE html>
<input id="step" type="range" min="0" max="10" value="4" step="4">
<script>
  var go_passes = [
    () => document.querySelector('#step').setAttribute('step', 2),
    () => document.querySelector('#step').removeAttribute('step'),
    // This |step| value should also trigger a property changed event
    // for UIA_RangeValueValuePropertyId
    () => document.querySelector('#step').setAttribute('step', 3),
  ];

  var current_pass = 0;
  function go() {
    go_passes[current_pass++].call();
    return current_pass < go_passes.length;
  }
</script>