I‘ve just started with Ext JS so please go easy on me
I got interested in this piece of technology as a replacement for Adobe Flex. I had a look at some tutorials and it all looks promising. I’ve created some simple example and I've already run into some incompatibilities between browsers (I am using up-to-date versions).
I did example which is displaying some messages using window (Ext.Window) and I've noticed different behaviour between browsers. To be more precise default button for closing (X) of that popup window does not appear in Firefox. For that reason I had to result to using custom buttons with linked actions (windows.close()) instead. I was under impression that this piece of technology was supposed to be cross-platform compatible but if I am running into issues like that straight away I am not sure if it’s worth it.
What are your experiences in that respect? Do we still have to test everything (and use workarounds if necessary) in 5 different browsers to make sure our app will work for all customers?