<!DOCTYPE html>

<html>
<head>
  <style type="text/css" media="screen">
    .box {
      display: inline-block;
      height: 120px;
      width: 300px;
      margin: 10px;
      border: 1px solid black;
      background-repeat: no-repeat;
      font-size: 12pt;
    }
    
    .em-units > .box {
      background-image: -webkit-linear-gradient(left, yellow, yellow 5em, green 5em);
      background-image: -moz-linear-gradient(left, yellow, yellow 5em, green 5em);
    }
    
    .indicator {
      background-color: black;
      height: 20px;
    }
  </style>
    <script type="text/javascript">
        if (window.testRunner)
            testRunner.waitUntilDone();
        function runTest()
        {
            document.getElementById("box4").style.fontSize = "36pt";
            if (window.testRunner)
                testRunner.notifyDone();
        }
    </script>
</head>
<body onload="setTimeout(runTest, 0);">
  <div class="em-units">
    <div id="box3" class="box"><div class="indicator" style="width: 5em;"></div></div>
    <div id="box4" class="box"><div class="indicator" style="width: 5em;"></div></div>
  </div>
</body>
</html>