layerFractionalOffset property

The fractional offset used to position the layer content within its layout box (defaults to Offset(-0.5, -0.5), centering the content).

The child paints its visible content shifted by this fraction, so the layer's visual center is not the layout box center. The scale animation uses this to anchor scaling on the visual center; otherwise scaling would pull the layer toward the box center (down-right for the default offset), making a combined slide + scale drift in diagonally instead of straight.