You can't classify apps as bottom-left or top-left. (Correct) apps will use whatever texture-coordinates and transforms are appropriate for each texture. There is a high possibility of multiple orientations being used.A form of UNPACK_FLIP_Y_WEBGL that only affected HTML element uploads is needed to provide a level of (texImage) consistency for 0,0=bottom-left apps that 0,0=top-left apps already enjoy.
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