Add target="_blank" in CSS
Solution 1:
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.
Solution 2:
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.
Solution 3:
There are a few ways CSS can 'target' navigation. This will style internal and external links using attribute styling, which could help signal visitors to what your links will do.
a[href="#"] { color: forestgreen; font-weight: normal; }
a[href="http"] { color: dodgerblue; font-weight: normal; }
You can also target the traditional inline HTML 'target=_blank'.
a[target=_blank] { font-weight: bold; }
Also :target selector to style navigation block and element targets.
nav { display: none; }
nav:target { display: block; }
CSS :target pseudo-class selector is supported - caniuse, w3schools, MDN.
a[href="http"] { target: new; target-name: new; target-new: tab; }
CSS/CSS3 'target-new' property etc, not supported by any major browsers, 2017 August, though it is part of the W3 spec since 2004 February.
W3Schools 'modal' construction, uses ':target' pseudo-class that could contain WP navigation. You can also add HTML rel="noreferrer and noopener beside target="_blank" to improve 'new tab' performance. CSS will not open links in tabs for now, but this page explains how to do that with jQuery (compatibility may depend for WP coders). MDN has a good review at Using the :target pseudo-class in selectors
Solution 4:
Another way to use target="_blank" is:
onclick="this.target='_blank'"
Example:
<a href="http://www.url.com" onclick="this.target='_blank'">Your Text<a>