I think we can learn a lot from Wordpress in this area
https://medium.com/@jpdevries/let-us-learn-from-wordpress-28b0803530d8#.no4vu6ow6
I intend to propose that with MODX Next we make a similar commitment to support WCAG Level AA in the core. I also think we should push for synchronous endpoints (old school form action submits) and particular considerations like High Contrast mode.
