Steps to reproduce: 1. Load data:text/html,<div role="treeitem">foo</div> 2. Use Accerciser to examine the element Expected results: the element would be exposed with ROLE_TREE_ITEM Actual results: the element is exposed with ROLE_LIST_ITEM ROLE_TREE_ITEM was added to ATK in July 2011. Why this was not chosen as the treeitem mapping for Core AAM 1.0 back then, I could not tell you. It is the treeitem mapping for Core AAM 1.1: https://rawgit.com/w3c/aria/master/core-aam/core-aam.html#role-map-treeitem

Turns out the macOS AXSubrole is also in need of a correction.

I verified this fixes both the ATK role and the AXSubrole via manual testing and use of platform accessibility inspectors. Due to bug 1212026, I'm not sure how to provide a mochitest for this. And the ARIA treeitem role already has test coverage in accessible/tests/mochitest/role/test_aria.html.

Comment on attachment 8878567 [details] [diff] [review] proposed patch Review of attachment 8878567 [details] [diff] [review]: ----------------------------------------------------------------- looks good, thanks! yes, no tests coverage for this, there's no yet way to make it

Pushed by ryanvm@gmail.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/b63a706320d9 Fix AtkRole and AXSubrole for ARIA treeitem. r=surkov