The document discusses HTML5 and provides information on several key aspects:
1) It introduces HTML5 and explains how it was developed as a cooperation between W3C and WHATWG with a focus on new features based on HTML, CSS, DOM and JavaScript.
2) It describes important multimedia elements like <video> and <audio> that allow embedding video and audio in a standard way, and covers supported formats in different browsers.
3) It outlines HTML5 graphics capabilities using <canvas> for drawing and inline SVG, as well as CSS3 effects.
4) It discusses HTML5 applications and features like web storage, app cache and web workers that improve application development and user experience.