One of our secret agents sent us a link to an AMAZING reference guide that shows exactly what HTML is supported by each version of the BlackBerry OS. This goes from OS 3.X to 4.6 and is the best guide I have seen so far. If you were planning on creating a website that looks good in the BlackBerry browser then this is the guide for you. It will tell you which OS supports which HTML tags and the level of support provided. Talk about an invaluable resource for developers looking to mobilize a website!!! You can see some samples below:
The guide can be found at this link and is quite extensive with over 108 pages of content. I still can’t understand why RIM does not publicize this information to help developers create BlackBerry compatible websites. This does seem to be beta documentation so it may no be 100% up to date.