Usability 
This is a forward looking test that is designed to test HTML 5 capabilities that will drive the next generation of mobile Webapps including XmlHttpRequest, <canvas>, <input type='date'>, contenteditable, Appcache, <video>, <audio>, Web Workers, localStorage, sessionStorage and @font-face. Most mobile browsers don't support many of these capabilities yet.
You can click though from the test to see a results page listing the scores for all tested browsers.