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Outbound tabs in new window pls
This is not possible.
The best we've got is this: http://www.w3.org/TR/css3-hyperlinks/#the-target-new
But the browser support is zero: http://www.w3schools.com/cssref/css3_pr_target-new.asp
It simply is not possible to open outbound links in a new tab from the HTML side of things... it's either a browser preference or a user decision.
The only thing we could do is "force every outbound link into a new window". But that has major implications for desktop use and we will not consider that at all.
Instead it's a user choice... if you're on desktop, use CTRL, APPLE, middle-click, etc... so that it opens in a new tab. If you're on mobile, tell your browser what to do or hold the link for a moment before you do it.
+1 for outbound links in a new tab. Makes so much more sense to have links take you away to a new tab and preserve the main session in the forum.