Initiating transitions on various properties of all boxes.

Expected Property: background-color Target: box2 Type: webkitTransitionEnd Elapsed Time: 0.2 -- PASS
Expected Property: left Target: box1 Type: webkitTransitionEnd Elapsed Time: 0.2 -- PASS
Expected Property: width Target: box3 Type: webkitTransitionEnd Elapsed Time: 0.3 -- PASS

