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<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>Case sensitivity</title>
  <style type="text/css"><![CDATA[
 .cs { color: green; }
 .cs P { background: red; color: yellow; }
 .cs .a { background: red; color: yellow; }
 .cs .span1 span { background: red; color: yellow; }
 .cs .span2 { color: red; }
 .cs .span2 SPAN { color: green; }
 .cs .span2 span { background: red; color: yellow; }
 .ci { color: red; }
 .ci P { background: green; color: white; }
 .ci .a { background: green; color: white; }
 .ci .span1 span { background: green; color: white; }
 .ci .span2 SPAN { background: green; color: white; }
]]></style>
  <link rel="author" title="Ian Hickson" href="mailto:ian@hixie.ch"/>
  <link rel="help" href="https://www.w3.org/TR/css3-selectors/#selectors"/> <!-- bogus link to make sure it gets found -->
 </head>
 <body>
<div>

 <div class="cs">
   <p>This line should be green.</p>
   <p class="A">This line should be green.</p>
   <p class="span1"><SPAN>This line should be green.</SPAN></p>
   <p class="span2"><SPAN>This line should be green.</SPAN></p>
 </div>


</div>
</body>
</html>