Ben wrote: "or if I know the client will be editing the pages, and in all likelihood will be adding tags or attributes (such as target _blank) that are deprecated in XHTML strict 1.0. I would say its better to give them a more flexible doctype that is less likely to become invalid html due to their editing." So what is the syntax to use instead of target _blank if you want to open a new browser window ? When I read http://www.w3schools.com/html/html_links.asp It still gives imformation for using this. Thanks Lisa Ps. Thanks for all those who replied re the doc type question, it has geiven me some good pointers for reading and food for thought to digest.