This document discusses Opera's support for HTML5 mobile web app developers. It provides an overview of HTML5 and what capabilities it makes available to web applications, such as geolocation, battery status, and WebRTC. It also outlines the three main ways Opera is supporting HTML5 developers: 1) Through its mobile browser, 2) Developer tools like Dragonfly for debugging, and 3) Education resources on Dev.Opera. It acknowledges HTML5 capabilities may not be fully supported across all browsers yet.