<!DOCTYPE html>
<html class="reftest-wait">
  <head>
    <script>

document.addEventListener("MozReftestInvalidate", function() {
  document.getElementById("i").select();
  document.documentElement.className = "";
}, false);

    </script>
  </head>
  <body>
    <input id="i" type="text" value="123">
    <!-- div to cover spin box area -->
    <div style="display:block; position:absolute; background-color:black; width:200px; height:100px; top:0px; left:100px;">
  </body>
</html>