title: Non-Mozilla equivalents of MozAfterPaint?
body: <p>I'm looking for a way to measure reaction times (how quickly a user can press a key after some image is presented). Measuring the time of the key press is obviously no problem, but I haven't figured out how to measure the time of the paint event/presentation of the stimulus. Mozilla's MozAfterPaint seems perfect for this, but are there equivalents for other browsers?</p>