1.CLASS和ID的優先順序比較.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
<title>無標題 1</title>
<style type="text/css">
.a h1{
color:fuchsia;
}
.b h1{
color:lime;
}
#a h1{
color:fuchsia;
}
#b h1{
color:lime;
}
</style>
</head>
<body>
<div class="a">
<h1>CLASS在前</h1>
<div id="b">
<h1>ID在後</h1>
</div>
</div>
<div class="a">
<h1>CLASS在前</h1>
<div class="b">
<h1>CLASS在後</h1>
</div>
</div>
<div id="a">
<h1>ID在前</h1>
<div class="b">
<h1>CLASS在後</h1>
</div>
</div>
<div id="a">
<h1>ID在前</h1>
<div id="b">
<h1>ID在後</h1>
</div>
</div>
</body>
</html>
結論:上面的代碼說明了在CSS樣式中ID的優先順序別比CLASS要高.(IE 6 7 8 FF C結果一致)
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