ARIA versioning: #1990 vs. removal discussion
Examples: no more group role in list allowed in ARIA 1.2, possible #1024 extended values deprecation (?!)

Issue 1990 describes in detail the problematic consequences of ARIA attribute removals for development. I do see two major pinpoints:

• without versioning of validator rules (check for ARIA 1.1 compliance etc.) devs get punished by useage of "forbidden" properties that were allowed in earlier ARIA specs
• as a consequence, entire frameworks built up on removed stuff have to be changed which causes irritation and distrust on dev side

This can be resolved or at least eased if ARIA group creates a solid statement for Validators to check by ARIA spec number versioning (as HTML checkers already do for a long time).