TouchList objects

Test button!

Illustration of difference between:

• touches (outer circle, white)
• targetTouches (middle circle, green)
• changedTouches (inner circle, red)

All events only bound to button element, but once touched, touchpoints that didn't originate on the button (from the touches list) will also appear.

Note that when a touch leaves the screen, its last known position is still retained in changedTouches (leaving behind a red circle).