Not all devices support Zooming.
Why does EPUB3 not have a 'Rotation' property because of all the devices with accelerometers, or portrait viewing?
rotate:
right-bestfit, left-bestfit ;rotates (with respect to the text) in the direction, to fit the aspect as needed.
none,right,left,flip ; locks the image to the text (note that text should also have a rotate property for Tables charts and captions). flip is a 180 rotate (just in case)
Meanwhile, I pre-rotate maps and pictures for my fixed, Portrait display to get the biggest image on the (5") screen