The Web Platform Working Group has published a W3C Recommendation of HTML 5.1. This specification defines the 5th major version, first minor revision of the core language of the World Wide Web: the Hypertext Markup Language (HTML). In this version, new features continue to be introduced to help Web application authors, new elements continue to be introduced based on research into prevailing authoring practices, and special attention continues to be given to defining clear conformance criteria for user agents in an effort to improve interoperability.
Yesterday, November 1, 2016 the World Wide Web Consortium (W3C) has released the official HTML 5.1 specification and it is a W3 recommendation. In an announcement, W3C said that the specification defines “the 5th major version, first minor revision” of the core language of the World Wide Web: the HTML. This way, 5.1 has become a “W3C Recommendation”, replacing HTML 5.
In the latest version, the new features have been introduced with the help of Web application authors, following the tradition of previous versions. Also, based on the research into the existing practices, some new elements too have been introduced.
W3C writes that HTML 5.1 gives special attention and defines clear conformance criteria for user agents to improve interoperability.
Compared to HTML 5, there aren’t tons of new features, obviously. The main features that have arrived with this Recommendation are the < picture >, < dialog >, and the < summary > & < details > combo tags. You can find the complete set of changes here.
The announcement also mentions that W3C aims to produce the HTML 5.2 Recommendation in late 2017, which will replace HTML 5.1 Recommendation.
Find the full HTML 5.1 Recommendation here.