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This slide deck gives a quick overview of the W3C specification maturity process and the various HTML versions.
The World Wide Web Consortium or the W3C is an international community that develops open standards for the Web.
The W3C produces specifications on a wide range of web-related topics (including HTML and CSS).
W3C technical specifications have four levels of maturity:
A document that W3C has published for review by the community, including W3C Members, the public, and other technical organizations.
A document that satisfies the Working Group's technical requirements, and has already received a comprehensive review.
A document that has been accepted by the W3C Director as of sufficient quality to become a W3C Recommendation.
A specification or set of guidelines that, after extensive consensus-building, has received the endorsement of W3C Members and the Director.
HTML 2.0 was published as RFC 1866 on November 24, 1995
HTML 3.2 was published as a W3C Recommendation January 14, 1997.
It was the first version developed and standardized exclusively by the W3C.
HTML 4.0 was published as a W3C Recommendation on December 18, 1997.
HTML 4.01 was published as a W3C Recommendation on December 24, 1999
After HTML 4.01, there was no new version of HTML for many years as the W3C's HTML Working Group was focused on XHTML.
HTML5 was published as a W3C Recommendation on October 28, 2014
HTML 5.1 was published as a W3C Recommendation on November 1, 2016.
HTML 5.2 was published as a W3C Recommendation on December 14, 2017.
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