Chrome Version: ToT 

Steps To Reproduce:
(1) Create a folder containing 64 empty folders.
(2) Turn ChromeVox ON.
(3) Navigete to the item near the bottom of the list.
(4) Select a single row (not just a filename, but the whole row).

Expected Result:
ChromeVox outputs file name, size, type, date, then [63 of 64].

Actual Result:
ChromeVox outputs file name, size, type, date, then [17 of 18] or so.

How frequently does this problem reproduce? (Always, sometimes, hard to
reproduce?)
Always

This happens because aria-posinset and aria-setsize is only attached to the elements being selected.

Also see  Issue 151471 .