说明:

匹配属于父元素中唯一子元素的E

兼容性:

类型 IEInternet Explorer FirefoxFirefox ChromeChrome OperaOpera SafariSafari
版本 (×)IE6 (×)Firefox 2.0 (√)Chrome 1.0.x (√)Opera 9.63 (√)Safari 3.1
(×)IE7 (√)Firefox 3.0 (√)Chrome 2.0.x (√)Safari 4Public beta
(×)IE8 (√)Firefox 3.5

示例:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<style type="text/css">
p:only-child {color:#FF0000;}
</style>
<title>结构性伪类 E:only-child</title>
</head>

<body>
<div style="width:733px; border: 1px solid #666; padding:5px;">
<div>
	<p>匹配属于父元素中唯一子元素的E</p>
</div>
<div>
	<p>匹配属于父元素中唯一子元素的E</p>
	<p>匹配属于父元素中唯一子元素的E</p>
</div>
</div>
</body>
</html>
 

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