CombinationShould look
HTMLImage, UNPACK_FLIP_Y_WEBGL falseupside down
HTMLImage, UNPACK_FLIP_Y_WEBGL trueupright
ImageBitmap, UNPACK_FLIP_Y_WEBGL false, imageOrientation defaultupside down
ImageBitmap, UNPACK_FLIP_Y_WEBGL false, imageOrientation flipYupright
ImageBitmap, UNPACK_FLIP_Y_WEBGL true, imageOrientation defaultupside down
ImageBitmap, UNPACK_FLIP_Y_WEBGL true, imageOrientation flipYupright
ImageBitmap, UNPACK_FLIP_Y_WEBGL false, imageOrientation flipY and no dimensionsupright