I don’t know if anyone is still interested in this, but I personally like all my code to be Strict because it reflects better upon me as a web developer. Transitional is also not supposed to be used, and people really should be moving completely over to strict.
In any case, I wrote a wordpress plugin which will replace your target=”_blank” links with rel=”external” and it will also insert the necessary javascript.
Here’s the download link: zshare link
if you have any questions: damon jablons at gmail dot com
