HTML / XHTML Validation
When you want to make sure all your code is correct and valid you need to run a validation check on every page.
There are different programs that you can use to make sure your code is correct. I will list some of the programs and tell you what
I can about each.

W3C Validator (World Wide Web Consortium). This is who sets the standards for the internet. The html/xhtml validator will tell you if your web page is valid or not, it will also tell you what line the error is on (if you have one) and what exactly the error is. This validator will check one page at a time by either file upload or url.

WDG Validator (Web Design Group) copyright of Liam Quinn. This validator will validate your html/xhtml either by file upload, direct imput, or online. The validator tells what line the error is on and what it is. One other nice feature about the WDG validator is it will check single pages or multiple pages up to 50.
A Real Validator
An offline validator (30 day free trial - It is $25 well spent US dollars if you decide to purchase with life time upgrades free) It will keep your pages error free from now on. I would not be with out this program.
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