选择符优先级带来的样式失效:
由于CSS选择符优先级可能引起某些样式失效，这个问题初学者可能会碰上，但是往往并不容易发现。
代码实例:
<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="author" content="http://www.51texiao.cn/" /><title>蚂蚁部落</title><style type="text/css">.mydiv{color:green;}</style></head><body><div class="mydiv"> <ul> <li>蚂蚁部落</li> <li>div+css专区</li> <li>HTML专区</li> </ul></div></body></html> 以上代码可以将li元素中的所有文字设置为绿色。这个时候可能需求变了，要将第一个li元素作为标题，需要改变一下它的元素。
代码如下:
<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="author" content="http://www.51texiao.cn/" /><title>蚂蚁部落</title><style type="text/css">.mydiv li{color:green;}.myli{color:blue;}</style></head><body><div class="mydiv"> <ul> <li class="myli">蚂蚁部落</li> <li>div+css专区</li> <li>HTML专区</li> </ul></div></body></html> 尽管给第一个li元素单独设置了class类，并且规定了新的颜色，但是并没有生效。这就是由选择符优先级导致的。
只要将CSS代码做如下修改即可:
.mydiv li{color:green;} .mydiv .myli{color:blue;} 如需了解选择符优先级规则，可以参阅CSS选择符优先级一章节。
原文地址是:http://www.51texiao.cn/div_cssjiaocheng/2015/0519/1894.html
最为原始地址是:http://www.softwhy.com/forum.php?mod=viewthread&tid=4701
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