Discuss/Review ARIA relational terms

[spectranaut]

Many terms are in the process of being reworked, and it would be good to review them all together as a working group.

Here is a document for reviewing: https://docs.google.com/document/d/1vw1sWNvch0LOIwN45KU3MporVaAlBy_Q6SoGw-tZgmA/edit#

Terms include:

• Accessibility Tree
• Parent/Child, Accessibility Parent/Child, "owned by", reworked in Update required owned elements and required context role #1454
  • Related 1.3 blocking issues:
    • Unclear use of the term "descendant" #1150
    • Inconsistent use of "owned by" #1161
  • Dependent issues:
    • Clarify relationship between aria-hidden and aria-owns #1839
• scope/context dependent roles/minimum roles
  • HTML-AAM check AX role mappings against webkit expected #375