subscribe to changes in the natural resolution of an on-screen element (usually a <canvas>).
<canvas>
put another way, cb is called whenever getNaturalResolution would return a different value. under the hood, this combines monitorDevicePixelRatio with a ResizeObserver.
cb
ResizeObserver
stop / deregister callback
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subscribe to changes in the natural resolution of an on-screen element (usually a
<canvas>).put another way,
cbis called whenever getNaturalResolution would return a different value. under the hood, this combines monitorDevicePixelRatio with aResizeObserver.