preventDefault research

I'm doing some of my own research on preventDefault behavior for touch 
events, because we are busy implementing this in Firefox.  Here's a test 
page that others might find useful:
http://limpet.net/w3/touchevents/preventDefault.html

Safari, Android WebKit, and Opera Mobile 11 all display the following 
behaviors:

1) preventDefault on the touchstart event prevents scrolling and 
mouseup/mousedown/click events.

2) preventDefault on the touchmove event prevents scrolling.

3) preventDefault on the touchend event does NOT prevent scrolling or 
mouse events.