Joined: 13 Jun 06
15 Oct 07 9:28 pm
Validating your html is not REALLY necessary. It just means that you've written the HTML for the site to be "correct" based on the type of HTML that you've said that you're writing.
At the top of your page you're meant to have a "doctype declaration" which says whether you're using old-style "HTML 4.0 transitional" (with lots of nasty presentational tags like <center> and <font size=2 color=red> etc) or whether you've decided to try to use a more strict (better) version of (X)HTML.
But really... all it means is that your site is "correct". You can often use a validator to help you see problems with your code (that may or may not affect your sites ability to be crawled and indexed) but depending on what doctype you're using, there are so many things that can invalidate your page, that often its not all that possible to get a completely valid page. And spending time honing your site for validation perfection is not really time well spent, in my books.
Not many of my pages validate :)
Just my two cents. If you can do it -- great! Just don't panic if you can't.