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...The available timing functions available are listed on MDN although we don't recommend any of the step timing functions. If you want something really bespoke you could use Lea Vearou's Cubic bezier tool.
LEA is a lightweight eyetracking algorithm library (hence the name) written in and for Java. LEA is able to track eye movements with an ordinary webcam and returns relative movements (up, down, ...). It is also able to compensate for slight head motions.