CSS Working Group Meeting Happenings Add to calendar Event details Date: 11 January 2017, 00:00 – 13 January 2017, 23:59 Coordinated Universal Time Location: Seattle, WA, USA Host: Microsoft Website: https://wiki.csswg.org/planning/seattle-2017 Cascading Style Sheets (CSS) is a style sheet language that allows authors and users to attach style.