Sencha Touch as before the Internet to understand, then probably so few features:
It is a based on the latest web standards: html, javascript, css them. Small library, then, after compression, gzip and disable some components and up to 80kb.
It is compatible with both android, ios these devices.
There is a touch event, it is touchstart, touchend events based on the increase of the number of data integration as: tap, swipe, pinch;
Data integration, it provides a powerful packet, binding by ajax, jsonp, YQl like manner to the assembly template, all writes to the local off-line storage.