@Dipscom, thank you for the answer. My working animation will be more complex (include rounded corners, control point ect.) The question was more theoretical, why `left: 100%` in bezier values return strange result? - Because `left: 0` recalculate in `px` not `percentage`. (fork - http://codepen.io/olegatro/pen/YqrXBp) I think you are right, bezier path not good solution for my task. Offtop: Is there a way to use markdown editor ?