js-display-durations Testing different methods of displaying stimuli in JavaScript Calibration https://vassar-cogscilab.github.io/js-display-durations/experiment/calibration.html requestAnimationFrame ONLY methods https://vassar-cogscilab.github.io/js-display-durations/experiment/all_rAF_frame_counting.html https://vassar-cogscilab.github.io/js-display-durations/experiment/all_rAF_time.html https://vassar-cogscilab.github.io/js-display-durations/experiment/all_rAF_time_frame_counting.html double rAF methods https://vassar-cogscilab.github.io/js-display-durations/experiment/double_rAF_time.html https://vassar-cogscilab.github.io/js-display-durations/experiment/double_rAF_time_silent_change.html