Add target="_blank" in CSS
Unfortunately, no. In 2013, there is no way to do it with pure CSS.
Update: thanks to showdev for linking to the obsolete spec of CSS3 Hyperlinks, and yes, no browser has implemented it. So the answer still stands valid.
As c69 mentioned there is no way to do it with pure CSS.
but you can use HTML instead:
use
<head>
<base target="_blank">
</head>
in your HTML <head> tag for making all of page links which not include target attribute to be opened in a new blank window by default.
otherwise you can set target attribute for each link like this:
<a href="/yourlink.html" target="_blank">test-link</a>
and it will override
<head>
<base target="_blank">
</head>
tag if it was defined previously.