Bug 1626638 - Add subrole of AXTabButtton to page tabs. r=morgan

Differential Revision: https://phabricator.services.mozilla.com/D69212

--HG--
extra : moz-landing-system : lando

accessible/mac/mozAccessible.mm

@@ -1031,6 +1031,9 @@ static const uint64_t kCacheInitialized = ((uint64_t)0x1) << 63;
     case roles::TOGGLE_BUTTON:
       return @"AXToggle";
 
+    case roles::PAGETAB:
+      return @"AXTabButton";
+
     default:
       break;
   }

accessible/tests/browser/mac/browser_app.js

@@ -62,8 +62,7 @@ add_task(async () => {
 
   let tab = selectedTabs[0];
   is(tab.getAttributeValue("AXRole"), "AXRadioButton", "Correct role for tab");
-  // Bug 1626638
-  todo_is(
+  is(
     tab.getAttributeValue("AXSubrole"),
     "AXTabButton",
     "Correct subrole for tab"

accessible/tests/browser/mac/browser_selectables.js

@@ -30,8 +30,7 @@ addAccessibleTask("mac/doc_aria_tabs.html", async (browser, accDoc) => {
 
   let tab = selectedTabs[0];
   is(tab.getAttributeValue("AXRole"), "AXRadioButton", "Correct role for tab");
-  // Bug 1626638
-  todo_is(
+  is(
     tab.getAttributeValue("AXSubrole"),
     "AXTabButton",
     "Correct subrole for tab"