From our experience to develop the mobile app with HTML5/Javascript/CSS i.e. Cordova, not only that the mobile safari in iOS and webkit in Android sometimes no

From our experience to develop the mobile app with HTML5/Javascript/CSS i.e. Cordova, not only that the mobile safari in iOS and webkit in Android sometimes not render js/css the same ( the point brandon_wirtz has raised), but another difficulty we found very hard is to debug the javasript (js that resides in the device, not on the server side) . in iOS it's okay we could connect device/simulator and open the safari inspector to debug. But in android it's almost impossible to know what & where the javascript has gone wrong and fix. The webkit in android 2.3.x version also will render differently on some css properties compared to 4.x version.