<html>
  <head>
    <title>combine_css example</title>
    <link rel="stylesheet" type="text/css" href="styles/yellow.css">
    <link rel="stylesheet" type="text/css" href="styles/blue.css">
    <link rel="stylesheet" type="text/css" href="styles/big.css">
    <link rel="stylesheet" type="text/css" href="styles/bold.css">
  </head>
  <body>
    <div class="blue yellow big bold">
      Hello, PageSpeed!
    </div>
  </body>
</html>