This test performs an animation of the left property. It animates over 1 second. It takes 3 snapshots and expects each result to be within a specified range.
PASS - "left" property for "box1" element at 0.25s saw something close to: 512
PASS - "left" property for "box1" element at 0.5s saw something close to: 537
PASS - "left" property for "box1" element at 0.75s saw something close to: 487