What's the point of valid CSS/HTML?

Question

If I\'ve tested my pages in most major browsers, why would I need to maintain a validated code? I want to use box-shadows and corner radius if they\'re supported in WebKit b

Answer 1

I'll answer by an analogy. What you are saying is like saying I like building my cars with square tires, it might not be valid everywhere, but it works for me.

If you do not make a product that can be available by a maximum of people, how do you expect your product to be known and used by a maximum of people. By ignoring people that are using IE (which is still the majority of people, by the way) your shooting yourself in the foot. You need to create something that can be used by a vast majority of people while trying to follow the standards for those browsers that do follow them.