<html>
  <head>
    <title>combine_css with ids</title>
    <link rel="stylesheet" type="text/css"
          href="../mod_pagespeed_example/styles/yellow.css" id="not-allowed">
    <link rel="stylesheet" type="text/css"
          href="../mod_pagespeed_example/styles/blue.css"
          id="allowed-to-combine-1-foo" data-other="this disallows">
    <link rel="stylesheet" type="text/css"
          href="../mod_pagespeed_example/styles/big.css"
          id="allowed-to-combine-1-foo">
    <link rel="stylesheet" type="text/css"
          href="../mod_pagespeed_example/styles/bold.css"
          id="allowed-to-combine-2-bar">
  </head>
  <body>
    <div class="blue yellow big bold">
      Hello, PageSpeed!
    </div>
  </body>
</html>