In Drupal 8, several very important accessibility improvements landed:

This module exists to simplify using and testing these APIs.

Drupal.announce announcements
Can override Drupal.announce() to not only announce UI changes via ARIA live regions, but to also log these aural announcements to the browser console.
Drupal.TabbingManager tabbing constraints
Can log when tabbing is constrained and visually indicate which elements are reachable.

Requirements

This module requires the following modules:

Configuration

Go to Administration » Configuration » Development » Devel settings » Devel Accessibility settings to configure which accessibility development tools you want to enable.

Maintainers

Supporting organizations: 

Project information

Releases