The Web Content Accessibility Guidelines (WCAG) are part of a series of web accessibility guidelines published by the Web Accessibility Initiative (WAI) of the World Wide Web Consortium (W3C), the main international standards organization for the Internet. They are a set of recommendations for making Web content more accessible, primarily for people with disabilities—but also for all user agents, including highly limited devices, such as mobile phones. WCAG 2.0, were published in December 2008 and became an ISO standard, ISO/IEC 40500:2012 in October 2012. WCAG 2.1 became a W3C Recommendation in June 2018. History Earlier guidelines (1995–1998) The first web accessibility guideline was compiled by Gregg Vanderheiden and released in January 1995, just after the 1994 Second International Conference on the World-Wide Web (WWW II) in Chicago (where Tim Berners-Lee first mentioned disability access in a keynote speech after seeing a pre-conference workshop on accessibility led by Mike Paciello). Over 38 different Web access guidelines followed from various authors and organizations over the next few years. These were brought together in the Unified Web Site Accessibility Guidelines compiled at the University of Wisconsin–Madison. Version 8 of the Unified Web Site Accessibility Guidelines, published in 1998, served as the starting point for the W3C's WCAG 1.0. Version 1 (1999–2000) The WCAG 1.0 were published and became a W3C recommendation on 5 May 1999. In February 2008, The WCAG Samurai, a group of developers independent of the W3C, and led by Joe Clark, published corrections for, and extensions to, the WCAG 1.0. Version 2 (2001–2020) The first concept proposal of WCAG 2.0 was published on 25 January 2001. In the following years new versions were published intended to solicit feedback from accessibility experts and members of the disability community. On 27 April 2006 a "Last Call Working Draft" was published. Due to the many amendments that were necessary, WCAG 2.0 were published again as a concept proposal on 17 May 2007, followed by a second "Last Call Working Draft" on 11 December 2007. In April 2008 the guidelines became a "Candidate Recommendation". On 3 November 2008 the guidelines became a "Proposed Recommendation". WCAG 2.0 were published as a W3C Recommendation on 11 December 2008. In October 2012, WCAG 2.0 were accepted by the International Organization for Standardization as an ISO International Standard, ISO/IEC 40500:2012. In early 2014, WCAG 2.0's Level A and Level AA success criteria were incorporated as references in clause