The con is not all browsers support the same features. Sure, we've come along since IE6 and Mozilla but if I'm creating a web-based desktop app, I want to deplo

The con is not all browsers support the same features. Sure, we've come along since IE6 and Mozilla but if I'm creating a web-based desktop app, I want to deploy with 100% certainty that the CSS/JS I used works exactly the same when I was developing it.