Has the official support for mobile browsers on Android, iOS, BlackBerry, etc changed by any chance? By that I mean will they be supported?
I just tested on my Transformer Prime running Android 4.1:
* Chrome 26 - Highlight some text and then press bold and it's like that is making the selection. Need to press bold a second time to bold things. This is consistent with version 3. Use the new menus and this works as expected.
* Default browser - It can easily highlight a single word, but try and edit the selection and it basically moves to the beginning until where you wanted it.This is a change from version 3.
* Firefox 20 - Highlighting works even better than it did in version 3.0. It works perfect if you select a word and edit it to select further to the right. It falls apart when you try to make it select to the left. As soon as you highlight text and hit bold/italic it will perform the action. Bring up the menus and you lose the selection.
* Opera 12.1 - Highlighting was the easiest of all the browsers. Unfortunately as soon as I clicked on the italic button it unselected the text and moved the cursor to the beginning. This is a regression from version 3. Interesting enough. If you highlight and bring up the menus it does not lose the selection right away. You can even hit strikethrough and it works. Hit bold and it jumps the cursor to the beginning and creates a new paragraph with strong text.
iPhone 4 running iOS 6 - I could select text once and italicize. Selected some other text and then hit bold and it bolded the first text ...
Galaxy Nexus running Android 4.2.2 sees the same results from the Transformer Prime.
Under no situation was I able to drag images using iOS or Android. Nor could I drag the image with my finger or a pen on a Surface Pro (but I could with a mouse). That is consistent with version 3.0. I actually have code that fixes this with version 3 that I could maybe help with if interested.