multiple-changes.html

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<!DOCTYPE html>

<html class="reftest-wait">

  <body>

    <style>

      #a { border: 1px solid black; width: 100px; height: 100px; }

      #b { border: 1px solid blue; width: 50px; height: 50px; }

      div { position: absolute; }

    </style>

    <script>

      document.addEventListener("MozReftestInvalidate", function() {

        var a = document.querySelector("#a");

        var b = document.querySelector("#b");

        a.style.left = "10px";

        b.style.left = "20px";

        document.documentElement.removeAttribute("class");

});

    </script>

    <div id="a">

      <div id="b">

      </div>

    </div>

  </body>

</html>