PASS - "left" property for "box" element at 0.5s saw something close to: 100
PASS - "left" property for "box" element at 1.5s saw something close to: 300
PASS - "left" property for "box" element at 2.5s saw something close to: 300
PASS - "left" property for "box" element at 3.5s saw something close to: 100