swa66 - 2:29 pm on Aug 8, 2012 (gmt 0)
But the main point is that while it's frowned upon in the old html4, it's valid in (x)html5, and hence it's valid as long as you use the current html version.
The (x)html5 references:
Target on an <a> element: [w3.org...]
Valid browsing contexts (the value for target=): [w3.org...]
Usability: I have strong doubts on using it, esp when you see the high percentage of users on mobile devices nowadays ...