Media Source Extensions™ publication history Date Status 14 November 2023 Working Draft 2 November 2023 Working Draft 25 October 2023 Working Draft 23 October 2023 Working Draft 10 October 2023 Working Draft 21 September 2022 Working Draft 26 July 2022 Working Draft 19 May 2022 Working Draft 18 May 2022 Working Draft 10 May 2022 Working Draft 5 May 2022 Working Draft 30 March 2022 Working Draft 18 March 2022 Working Draft 17 February 2022 Working Draft 30 September 2021 First Public Working Draft