The size a frame is sent at: its own size, or scaled down so the longer side is at most maxDimension pixels. Never enlarges, and never returns a side smaller than 1.
maxDimension
The frame's own size.
Optional
The cap on the longer side; undefined or a non-positive value means no cap.
undefined
The size a frame is sent at: its own size, or scaled down so the longer side is at most
maxDimensionpixels. Never enlarges, and never returns a side smaller than 1.