Since I have some experience with QML (Symbian, Meego, Ubuntu Touch and BlackBerry 10) I will try to answer this question as simple as possible: There is wet d

Since I have some experience with QML (Symbian, Meego, Ubuntu Touch and BlackBerry 10) I will try to answer this question as simple as possible: There is wet developer dream to write software that can be written once and used everywhere. In mobile area one way to accomplish this dream is to use HTML + CSS + JS. HTML while being good for web pages is not the best choice for apps (while it gets better). Now you can replace HTML with QML. It is better than HTML because you declare everything in UI paradigms like rectangles, text, gradients and etc. (QML can be styled using CSS as well while that's not very necessary). Unfortunately I have not managed to persuade people above me that we should try out QML and HTML is their choice (e.g. because of Win8 support). Does QML solves run everywhere problem? Most probably no, each platform expects some "native" feel (even if "native" is done in QML). E.g. Blackberry and Ubuntu users expects sliding menus, Android users expect working back button and etc. Native always win over cross-platform if you want to win users while I would love to see cross-platform solutions working.