Steve Faulkner shared a link to a new spec: "ARIA in HTML". The specification defines what landmarks and ARIA attributes are valid, and maybe more importantly, it describes invalid scenarios, too!
This spec is one for your bookmarks. I promise!
If you want to see the spec in action, Steve also shared tools that already implement it (such as the W3C validator).
Frontend nerd with over ten years of experience, "Today I Learned" blogger, conference speaker, Tiny helpers maintainer, and DevRel at Checkly.