Bon le target n'est PAS déprécié :

http://dev.w3.org/html5/markup/a.html

target = browsing-context name or keyword CHANGED #
A name or keyword giving a browsing context for UAs to use when following the hyperlink.
The target attribute on the a element was deprecated in a previous version of HTML, but is no longer deprecated, as it useful in Web applications, particularly in combination with the iframe element.