User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a9pre) Gecko/2007110405 Minefield/3.0a9pre Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a9pre) Gecko/2007110405 Minefield/3.0a9pre Open a page with an ARIA Tree View. Focus on a tree view item and note that the IA2 similar items in group is always 1 less than the total items. Reproducible: Always Steps to Reproduce: 1.Open a page with an ARIA Tree View. 2.Focus on a tree view item. 3.Use the Inspect program to observe IA2 properties. 4.Under IAccessible2>Group Position>similarItemsInGroup, the value is always 1 less than the total. Expected Results: This was compared to the same properties in Lotus Symphony, which is also IA2 enabled and, in that program, the number always matches the total. The JAWS screen reader is already set up for that property and so it announces the wrong n of m info in Firefox.

Comment on attachment 288261 [details] [diff] [review] grouPosition()'s similarItemsInGroup should be 1-based r=me