<!DOCTYPE html><html><head>
<title>Case sensitivity</title>
<style type="text/css">
.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">
<meta name="flags" content="">
</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>