anchor: left=100 top=50 right=300 bottom=130
start (LTR):
left: 100 top: 50
end (LTR):
left: 300 top: 130
self-start (LTR):
left: 100 top: 50
self-start (RTL):
left: 300 top: 50
25% (LTR):
left: 150 top: 70
25% (RTL container):
left: 250 top: 70