题目内容

在某个元素的前面插入内容的样式是？

A. div:after{ content:"-台词";background-color:yellow;color:red;font-weight:bold;}
B. div:before{ content:"-台词";background-color:yellow;color:red;font-weight:bold;}
C. div:center{ content:"-台词";background-color:yellow;color:red;font-weight:bold;}
D. div:top{ content:"-台词";background-color:yellow;color:red;font-weight:bold;}

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