mozilla-release/layout/reftests/forms/input/number/number-similar-to-text-unthemed-rtl.html

<!DOCTYPE html>
<html>
  <body style="direction: rtl">
    <input type="number" style="-moz-appearance:none; width:200px;" value="1">
    <!-- div to cover spin box area -->
    <div style="display:block; position:absolute; background-color:black; width:200px; height:100px; top:0px; right:100px;"></div>
  </body>
</html>