ARIA 1.0 Test Case: Tree role with aria-multiselectable
Leaf 1
Leaf 1A (Selected)
Leaf 1B
Leaf 1C (aria-selected='false')
Leaf 2 (Selected)
Leaf 2A
Leaf 2B
Leaf 2C
Leaf 3
Leaf 3A
Leaf 3B (aria-selected='false')
Leaf 3C (Selected)