The aria-errormessage attribute was added in ARIA 1.1. According to the Core AAM [1]: "If the referenced object is in the accessibility tree, expose a pointer to the accessible object using RELATION_ERROR_MESSAGE, and expose reverse relations as described in Relations." The reverse relation type for RELATION_ERROR_MESSAGE is RELATION_ERROR_FOR. Note that the relation types needed to implement this support will require we update the minimum versions of atk, at-spi2-core, and at-spi2-atk in jhbuild to at least 2.15.2. That also needs to be done in order to fix bug 172355, for which there is a proposed patch. Therefore making this bug depend on 172355. [1] https://rawgit.com/w3c/aria/master/core-aam/core-aam.html#ariaErrorMessage
<rdar://problem/32401234>
*** This bug has been marked as a duplicate of bug 172588 ***