css中的伪类 之 first-child

昨天在看代码时,看到了下面这段代码

 

body:last-child {

    font: 64%/133.5% "MS Pゴシック", sans-serif;

}

 

这里的last-child是css中伪类

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下面举一段代码作为例子

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html>
<head>
<style type="text/css">
p:first-child {font-weight: bold;}
li:first-child {text-transform:uppercase;color:red}
</style>
</head>

<body>
<div>
<p>These are the necessary steps:</p>
<ul>
<li>Intert Key</li>
<li>Turn key <strong>clockwise</strong></li>
<li>Push accelerator</li>
</ul>
<p>Do <em>not</em> push the brake at the same time as the accelerator.</p>
</div>

<p><b>注释:</b>必须声明 DOCTYPE,这样 :first-child 才能在 IE 中生效。</p>
</body>

</html>


效果

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These are the necessary steps:
 •INTERT KEY
 •Turn key clockwise
 •Push accelerator
 
Do not push the brake at the same time as the accelerator.
 
注释:必须声明 DOCTYPE,这样 :first-child 才能在 IE 中生效。

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