Gradient Radial Y

Sets the vertical position of a radial gradient’s center, measured from the top edge of the frame. It applies only when gradient-type=radial. Pair it with gradient-radial-x to place the center anywhere.

gradient-radial-y accepts pixels, or a fraction from -1.0 to 1.0 of the frame’s height. The default is the center of the frame. Negative fractions and values beyond the frame place the center outside it, which is useful for a glow that enters from one side.

Lengths follow the Imgix literal rule: a decimal with exactly one . from -1 to 1 is a fraction, and anything else is pixels. On HLS and DASH, use fractions so the position matches in every rendition.