computed transform: matrix(0.5, 0, 0, 0.5, 0, 0)
computed origin: 60px 60px
computed box: view-box
style transform: scale(0.5)
style origin: 50% 50%
bcr: 25x25

Compare against a normal div:
computed transform: matrix(0.5, 0, 0, 0.5, 0, 0)
computed origin: 25px 25px
computed box: view-box
style transform: scale(0.5)
style origin: 50% 50%
bcr: 25x25
Edit in JS Bin