www.w3.org says the Web Content Accessibility Guidelines is up to version 2.1 as of June 5th, 2018
These links might be of help:
Thank you for your answer @bonespider. I wonder if there is a good trick/app or other way to integrate the newest updates.
The reason I am asking is because for a media technic exam a colleague of mine had to program a responsive website with dreamweaver using html and css.
He was told he didn‘t integrate the css style sheets up to the newest w3c standard.
So I was wondering how to keep up with all the guidlines effectively.