Posted 10 years ago · Author
Looking for a program that can debug your webpage's HTML and make sure that you are using legit code?
Use the w3c validator: http://validator.w3.org/

Just because it gives you an error does not mean there is something wrong with your code. It just means that your code is not valid, but often making your code valid will help it load faster, will fix bugs within your code, and will help your webpage work in all major browsers.