CSS Color Module Level 4

2016-07-06: Transparency creates challenges in measuring color contrast. There should be an a11y section that mentions this. Also need WCAG techniques. ACTION-2066 JF to take to WCAG. ACTION-2067 Janina to draft comment.
2016-07-27: Proposed comment from Janina. Looks ok to participants of 27 July 2017 teleconference.
2016-08-04: Formal comment sent.
2016-08-04: Comment response received requesting clarification.
2016-08-11: Reply clarifying "we want it all".
2020-11-18: Add this to the "CSS TF" aka Amy plate.