I just learned the html dtd (from a template because no one will remember such a thing) but I want to know what the xhtml one is. Also, what is the strict, transitional, and all that? Does it apply to how strict the errors jump on you? I'm strict on it enough as it is, so I see no errors jumping up either way...except that the validator.w3.org wants a dtd. So which do I choose (I don't use frames, and cgi) and what is a page with a working example? I've never seen an xhtml page on the net.