Looping
You can configure some or all of your animation to repeat multiple times.
Looping the Whole Track
To make the whole animation loop, set endBehavior="loop" in your Timeline.
Boomerang
Boomerang is a special kind of loop: after your animation or region finishes, it will play backwards to its starting position before looping again.
To boomerang a whole animation, set endBehavior="boomerang" in your Timeline.
Looping Regions
You can configure individual regions to loop or boomerang as well. Loop configuration is set via each track region's loop property.
To make a region loop a certain number of times, set loop.count
To make a region loop until a certain time, set loop.until
To make a region loop for a certain amount of time, set loop.duration
To make a region boomerang, set loop.boomerang. This property can be used in combination with any other loop config.
Passive Loops
You may also set a track region's loop to true, rather than an object. If a track region's loop is true or { boomerang: true }, then it is called a passive loop.
Passive loops do not have a defined end time. Rather, they run until something else stops them...or forever, if nothing does.
If there are any passive loops in a Timeline of which endBehavior="continue", those passive loops will repeat indefinitely.