See also: Polish translation of this page as of June 2007 (now quite out of date)
The WHATWG works on a number of technologies that widely get referred to by the buzzword "HTML5". They are organised somewhat arbitrarily based on the preferences of those editing the specifications for those technologies.
This specification is a kitchen sink full of technologies for the Web. It includes the core markup language for the Web, HTML, as well as numerous APIs like Web Sockets, Web Workers, Web Storage, etc.
We also provide an edition of HTML optimized for Web developers.
This specification defines the core infrastructure used to define the Web.
This specification defines DOM APIs related to parsing markup into DOM trees and serializing DOM trees into markup.
This specification defines how Web pages can take over a user's entire screen (at the user's request), e.g. for gaming or to watch a video.
This specification provides an API to display notifications to alert users outside the context of a web page.
This specification defines how character encodings work on the Web.
This specification defines the infrastructure around URLs on the Web.
This specification defines the networking model for resource retrieval on the Web.
This specification defines algorithms used to determine the type of resources.
This specification defines the networking API exposed to scripts on the Web.
This specification aims to document the differences between the ECMAScript specification and the compatibility and interoperability requirements for ECMAScript implementations in web browsers.
This specification defines CSS features for book publishing and high-quality printing of Web pages.
This specification defines CSS features for floating elements around pages and columns.
This specification describes behaviours in CSS and Selectors that are not yet defined in the relevant specifications but that are nonetheless widely implemented.
For more details, please see the relevant FAQ entry.