Open
Description
I am not versed in CSS animations at all, scroll-based or otherwise, but looking through examples and specs, I felt like something was missing (orI simply failed to see it) and was wondering whether authors might feel a need to synchronize their style-based animations with a) the duration of a video/audio that is played back or b) the keyframe changes of an animated picture sequence (GIF, APNG, WebM/P, …).
Some possible consequences:
animation-duration: src(media.file);
animation-timeline: media(…);