Accessibility Compliance?

Considering Kirby for a project. A mandatory requirement for this is some manner of WCAG compliance. Can anyone elaborate as to functionality built in or which can be installed via plugins?

WCAG compliance in the frontend or in the backend?

Front end, what a visitor would see.
Backend, tools and/or methods to ensure compliance.

The frontend is totally up to you, so compliance depends on what you build in the frontend, as Kirby doesn’t impose anything on you.