Jeffrey Way writes in his article, "But it Doesn’t Validate", for Nettuts+:
"When validating, your primary focus should be on determining where you’ve made mistakes. Validation isn’t a game, and, while it might be fun to test your skills to determine how high you can get your score, always keep in mind: it doesn’t matter. And never, ever, ever compromise the use of the latest doctype, CSS3 techniques and selectors for the sake of validation."
Validators are great tools that help developers find mistakes in their code. However, they are just tools. These tools will report errors for not only mistakes but also cutting edge techniques that were implemented purposely by an experienced developer. These advanced techniques (e.g. CSS3, HTML5 in Chrome or Safari) when done as enhancements to the user experience instead of requirements for it (i.e. Progressive Enhancement) are 100% valid.
