They are sortable for me (Firefox). Clicking a table column header (with two triangles as "sortable" indicator) sorts by that column. I think tables have to be

They are sortable for me (Firefox). Clicking a table column header (with two triangles as "sortable" indicator) sorts by that column. I think tables have to be specifically marked as sortable for this to work. But in case of this thread's article it definitely is.