test the animation of elements with box-sizing:border-box
Click test to see the different animation behaviors

• content-box: default box sizing
• border-box: new css3 border-box box model using box-sizing and -moz-box-sizing
• border-box-extra: new css3 border-box model using box-sizing, -moz-box-sizing, -o-box-sizing, -webkit-box-sizing
• 1.7.2pre_swap_patch: swap method of fixing animation start size
• 1.7.1: current jQuery behavior
• 1.7.2pre_getwh_patch: previous patch that changed cssHooks for 'width' and 'height'