This is more of question than a post. When web developing many times you notice that something does not work in a certain browser. How do you know that the bug really is a bug. How can you find out for example that Safari do not understand document.print or that IE 5.0 do not add padding on inline elements. Is there anye resource where you can find this out or do you just have to remember all these quircks you stumble on when developing.
I have some resources that I use to try to find out if it is a bug or not.
Bugzilla
Position everything
Google
CSS Discuss
Any other resources, please post them. Also is there any official bug lists from Opera, Microsoft and Apple. Mozilla has one, is there others?