Last in tree order wins:
target.top: 250
a2.bottom: 250
target.left: 300
a2.left: 300
After recomputing earlier element's style:
target.top: 250
a2.bottom: 250
target.left: 300
a2.left: 300
After removing last element:
target.top: 50
a1.bottom: 50
target.left: 0
a1.left: 0