first-child 伪类的用法

<!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;} </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>评释：</b>必需声明 DOCTYPE，如许 :first-child 手腕在 IE 中奏效。</p> </body>

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