These events are recognized by most mobile browsers based on Webkit and can be experimented on devices like iPhone, iPod Touch, iPad and most Android devices.
jQTouch is a wonderful library for building a webapp. Thanks
to it's light architecture it can be extended with new features and
this is one such extension. jQTouch is now part of Sencha, The First HTML5 Mobile App Framework.
The demo bellow shows 2 usage examples: one example for scaling and one for rotating. For best experience, access this demo on an iPhone.
Image source: http://www.flickr.com/photos/fhke/3343741744/