User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.93 Safari/537.36 Steps to reproduce: See http://jsbin.com/tomoso/2/edit 1. Create an animation with a step function 2. Trigger the state that starts the animation (hover over example in example URL) that switches the background position, creating a stop-motion-like animation sequence. 3. Abort the hover before the animation has finished playing. Actual results: The animation follows a different path, causing the background to appear in unexpected places. Expected results: The animation should reverse along the same steps as it travelled in forwards, not dividing the current length of the transition into new steps (which I assume is what is happening). This strikes me as very unexpected behavior. (Note: Chrome seems to have the same behavior.)
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