<!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=utf-8" /><title>選擇符測試</title><style type="text/css"> div{display:block;width:400px;height:200px;} #first.son{background:#ccc;} .second.son{border:1px solid red;}</style></head><body> <div id="first" class="son first"> a </div> <div id="second" class="son second"> b </div></body></html>
形如#first.son的選擇符，支援性很好，ie6及以上，ff,opera,safari等瀏覽器都支援。
形如.second.son的選擇符，在ie6下不支援，後一個類名會覆蓋前一個類名，即直接識別為.son
其實可以利用第二條情況，作為一個針對ie6的hack來使用：
.xxx.son{} 只要.xxx部分是一個不存在的類名。就可以屏蔽ie6之外的瀏覽器。只對ie6下的.son有效。
這個hack的效果同 selector{ _property:value; } 大體一致。
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