“Use this checklist to help build accessibility into your process no matter your role or stage in a project.”
If you haven’t noticed, Vox Media has become an innovative force in new media. They are working at the junction where quality storytelling and appropriate advertising work as partners in co-creating content that serves a common audience with true value, instead of as co-conspirators in selling the unneeded to the unsuspecting. 
In 2016 six Vox members gathered in D.C. to figure out just how to approach accessibility on a company-wide scale. They’ve been documenting and sharing what they’re learning ever since. On this web page they share a really handy check list.
Checklist: Accessibility Guidelines