I love this Question and Answer:

http://dowebsitesneedtolookexactlythesameineverybrowser.com/

Read the URL (Do Websites Need To Look Exactly The Same In Every Browser?) and click on it.

This really says it all. What matters is the users to get to the information and complete the tasks in your website or web application. This initiative is very encouraging about moving on from wasting time in fixing CSS and JavaScript issues and focus on what matters – get the information to the user. I support this whole heartily.