CSS Containment Module Level 1 publication history Date Status 25 October 2022 Recommendation 22 December 2020 Recommendation 21 November 2019 Recommendation 15 October 2019 Proposed Recommendation 30 April 2019 Candidate Recommendation Snapshot 8 November 2018 Candidate Recommendation Snapshot 24 May 2018 Candidate Recommendation Snapshot 8 August 2017 Candidate Recommendation Snapshot 19 April 2017 Working Draft 21 February 2017 First Public Working Draft