shapes in MovieClips are hit:
[object Shape]

textfields are hit:
[object TextField]

bitmaps are hit:
[object Bitmap]

sprite includes self in results:
[object Sprite]

button's up state is hit, but not the parents:
count: 1
elements: [object Shape]
hits[0].parent: null

mouseChildren and mouseEnabled don't affect the result:
count: 1
elements: [object Shape]
hits[0].parent: null

hitArea doesn't affect the result:
count: 1
elements: [object Shape]
hits[0].parent: null
mask: null
mask: null

invisible elements aren't included:
count: 0

masks *do* affect the result:
count: 0
