This document provides an introduction to HTML5. It describes HTML5 as a draft specification from the W3C that is over 1100 pages and is not yet complete, as it continues to evolve. It adds new elements like canvas, video, audio, and inline SVG, and changes or removes some older elements and attributes. The document outlines the status and roadmap for the HTML5 specification. It also provides examples and demonstrations of new HTML5 features like video, audio, canvas, and geolocation.