Keeping aside the pros and cons of creating animations with JavaScript, there are a number of powerful JavaScript libraries available online that can render flawless presentation. Some of those are complex and require tweaking, some over-simplified and some of JavaScript animation libraries are suitable for short animations only. Timeline.js, however, gives a a nice framework for creating long sequences as well as short animation with powerful control on each frame of the animation.

Timeline.js provides complete frame by frame view of animation and also enables you to edit each frame individually.