It is ok to use target="_blank"; This was done away with in XHTML because targeting new windows will always bring up the pop-up alert in most browsers. XHTML will always show an error with the target attribute in a validate.
HTML 5 brought it back because we still use it. It's our friend and we can't let go.
Never let go.
http://stackoverflow.com/questions/4198788/is-it-alright-use-to-target-blank-in-html5
target="_blank4lyf"