The document discusses key features of HTML5, JavaScript, and CSS3 including offline storage, connectivity, file access, semantics, audio/video, 3D/graphics, presentation with CSS3, geolocation, and JavaScript frameworks for single page applications. Specific technologies are mentioned like cookies, web storage, IndexedDB, web workers, server-sent events, drag and drop files, and popular frameworks like jQuery, Modernizr, and Backbone.js.