<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
  <title>CSS Reftest Reference</title>
  <link rel="author" title="Kyle Zentner" href="mailto:zentner.kyle@gmail.com">
  <style>
  #left {
    float: left;
    height: 50px;
    width: 10px;
    background: blue;
  }
  #a {
    background: green;
    margin: 10px;
    width: 50px;
    height: 50px;
  }
  </style>
</head>
<body>
  <div id="left"></div>
  <div id="a"></div>
</body>
</html>