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James' comment: 5.7. Actions (Default action table) "treeitem activate + expand/collapse" This is two actions not one. Either remove treeitem from table, or change to: "treeitem activate or expand/collapse, as defined by the web application author"
For this table, since the column says default action, we can just have "activate". (In Firefox the default action is "activate". The second action is either "expand" or "collapse" depending on tree state) Note the app author doesn't specify these programmatic values in ARIA 1.0.
Removed "+ expand/collapse"