Bug 1676509 - Remove AXTitle from list item groups. r=morgan

Differential Revision: https://phabricator.services.mozilla.com/D96632

accessible/mac/AccessibleWrap.mm

@@ -325,6 +325,9 @@ Class a11y::GetTypeFromRole(roles::Role aRole) {
     case roles::LISTBOX:
       return [mozListboxAccessible class];
 
+    case roles::LISTITEM:
+      return [MOXListItemAccessible class];
+
     case roles::OPTION: {
       return [mozOptionAccessible class];
     }

accessible/mac/mozHTMLAccessible.h

@@ -39,3 +39,10 @@
 - (NSNumber*)moxExpanded;
 
 @end
+
+@interface MOXListItemAccessible : mozAccessible
+
+// override
+- (NSString*)moxTitle;
+
+@end

accessible/mac/mozHTMLAccessible.mm

@@ -87,3 +87,11 @@ using namespace mozilla::a11y;
 }
 
 @end
+
+@implementation MOXListItemAccessible
+
+- (NSString*)moxTitle {
+  return @"";
+}
+
+@end

accessible/tests/browser/mac/browser_label_title.js

@@ -43,3 +43,18 @@ addAccessibleTask(
     is(fieldset.getAttributeValue("AXDescription"), "Fields");
   }
 );
+
+/**
+ * Test to see that list items don't get titled groups
+ */
+addAccessibleTask(
+  `<ul style="list-style: none;"><li id="unstyled-item">Hello</li></ul>
+   <ul><li id="styled-item">World</li></ul>`,
+  (browser, accDoc) => {
+    let unstyledItem = getNativeInterface(accDoc, "unstyled-item");
+    is(unstyledItem.getAttributeValue("AXTitle"), "");
+
+    let styledItem = getNativeInterface(accDoc, "unstyled-item");
+    is(styledItem.getAttributeValue("AXTitle"), "");
+  }
+);