<html><head>
<title>:only-of-type pseudo-class</title>
<style type="text/css">.red { background-color : red }
.t1 :only-of-type { background-color : lime }
</style>
<link rel="author" title="Daniel Glazman" href="http://glazman.org/">
<link rel="help" href="https://www.w3.org/TR/css3-selectors/#selectors">
<meta name="flags" content="">
</head>
<body>
<div class="t1">
<p>This paragraph should have normal background</p>
<address class="red">But this address should have green background</address>
<p>This paragraph should have normal background</p>
</div>
</body></html>