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Having trouble understanding 3D transformations. I took a look at this page: https://greensock.com/css3/, but while they provide great demos, the code isn't shown so I can analyze and learn from it. In my pen demo ( ), I'm struggling to understand why my transforms do not animate smoothly to a 90 degree rotationY. When the animation starts it jumps and then animates the rest of the way...of course not the intended effect. Any assistance is appreciated. UPDATE: Ok, so I figured out I guess the parent container needed a perspective set. Now they animate smoothly, but at 90 degrees I'd expect them to disappear and I can still see them on an angle?