htmlbasictutor - 7:10 am on Jul 18, 2012 (gmt 0)
I would agree with phranque.
Although not perfect when solving cross-browser compatibility issues, it does help eliminate the (X)HTML coding as the problem.
I would validate the CSS coding also.
Your notice would alienate me if I visited. I have a number of browsers on my machine for testing purposes and even though I develop websites my default web browser is IE. Why? Because not everyone is a geek when it comes to using the internet. They work with what they have or what they are comfortable with. If it ain't broke, don't fix it. Even if your cool kid/grandkid says to use Firefox. (smiles) I want to see what the average visitor's experience is. I also test in all the other browsers I have just to be sure the geeks are happy also.