TTML Profiles for Internet Media Subtitles and Captions 1.0 (IMSC1) publication history Date Status 26 June 2018 Retired 21 April 2016 Recommendation 8 March 2016 Proposed Recommendation 28 January 2016 Candidate Recommendation Snapshot 19 May 2015 Candidate Recommendation Snapshot 9 December 2014 Candidate Recommendation Snapshot 30 September 2014 Working Draft 1 May 2014 First Public Working Draft