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运行代码 
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>W3Cschool教程(w3cschool.cn)</title> 
    <style>
    a.one:link {color:#ff0000;}
    a.one:visited {color:#0000ff;}
    a.one:hover {color:#ffcc00;}
    
    a.two:link {color:#ff0000;}
    a.two:visited {color:#0000ff;}
    a.two:hover {font-size:150%;}
    
    a.three:link {color:#ff0000;}
    a.three:visited {color:#0000ff;}
    a.three:hover {background:#66ff66;}
    
    a.four:link {color:#ff0000;}
    a.four:visited {color:#0000ff;}
    a.four:hover {font-family:monospace;}
    
    a.five:link {color:#ff0000;text-decoration:none;}
    a.five:visited {color:#0000ff;text-decoration:none;}
    a.five:hover {text-decoration:underline;}
</style>
</head>
<body>
<p>将鼠标移至链接上改变样式.</p>
    <p><b><a class="one" href="/css/" target="_blank">这个链接会改变字体颜色</a></b></p>
    <p><b><a class="two" href="/css/" target="_blank">这个链接会改变字体大小</a></b></p>
    <p><b><a class="three" href="/css/" target="_blank">这个链接会改变背景颜色</a></b></p>
    <p><b><a class="four" href="/css/" target="_blank">这个链接会改变字体样式</a></b></p>
    <p><b><a class="five" href="/css/" target="_blank">这个链接会改变下划线</a></b></p>
</body>
 
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运行结果
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