I noticed one more Safari problem when animating scale.
Safari doesn't seem to respect your scale if the element has display: inline (for example, it's a range). Make a block or an inline block.
It does not depend on the animation. This also applies to zooming without animation.
This was with Safari 9. Also with Mobile Safari iOS 9.
Chrome does not have this problem. He will happily scale the inline element.
JSFiddle to see it in action: https://jsfiddle.net/ca64gkma/5/
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