This is a 1st public draft of one of a set of module from @w3c_wai to enable Personalization Semantics in Web content. w3.org/TR/2018/WD-personaliz… They provide vocabularies to describe well-known semantics of aspects of Web content. These vocabularies can be used to annotate markup.

For instance, <button aui-action="undo" >Revert</button> would indicate that the said button is used to *undo* the last action, and could be rendered in a way personalized to the user - one goal is to make Web content more approachable to users with cognitive disabilities.