For a long time, HTML5 “mobile compatible” was just a marketing directive because we did not focus enough on the mobile version and we just made mobile and responsive tests without really focusing on real user experience. That was a mistake.
- better layout
- keyboard auto hides after sending message
- H264 for ios and android so both iphones and Androids are able to send streams and watch streams
- speed optimisation
- Many CSS fixing for readability (change size, paddings, margins)
- Synch uploading of photos to avoid bugs on Iphone while uploading
And much more…