Fill Image Motion Y

Sets a precise vertical focal point for the fill-image-motion effect. For zoom motions, the image pushes toward or pulls from this y coordinate. For pan motions, it anchors the vertical position when the pan direction is horizontal.

fill-image-motion-y accepts a float between 0 and 1, where 0 is the top edge and 1 is the bottom edge. When set, it overrides the vertical component of fill-image-motion-align on the y axis only.

This mirrors the concept of fp-y in the Rendering API — a fractional coordinate across the image height.

Use fill-image-motion-x to set the horizontal focal point independently.