The document summarizes metrics on mobile web fragmentation across various dimensions:
1) It shows data on the market share of handset brands, operating systems, and browsers across different regions. Popular brands, operating systems, and browsers are highlighted.
2) Versioning and usage data is provided for dominant operating systems like Android and iOS, showing differences across regions.
3) Browser market share and versions of rendering engines like WebKit are analyzed.
4) Support for HTML5 features like input tags and touch events is quantified based on metrics, finding lack of full support across devices currently.