That was an interesting article Mike.

I only started learning coding in February of this year and I basically went straight to XHTML 1.0 Strict because I believed it to be the best preparation for the future from what I had heard, which I now understand isn't necessarily true.

So if I accept what you say that HTML 4.0 Strict might be better, then what do I need to do differently? XHTML is all I know. Even after reading your article, and some of the things you linked to, I'm still a bit confused about the real differences between the two. I understand about XHTML requiring that all tags are closed properly and that things are nested correctly and that lower/upper case makes a difference, but none of those things would stop it validating as HTML right? What are the aspects of XHTML that can cause problems?

Also, if you have a chance, could you explain parsing errors, I hear about them from time to time but don't know what they are!