How to Set an if in css for opera browser? [duplicate]

题

How can have a custom css file for just opera browser ?

Something like IF IE.

I want to have a special one for opera.

解决方案

You may use the -o-prefocushack test this in a opera browser to see the difference

<p>HELLO WORLD</p>

p { font-size: 20px;  }
-o-prefocus, p{
       font-size: 90px;
}

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