When is animation performed?

Simple case: time-based animation
- begin, dur, end attributes
- values are in time (with "t = 0" value at loading)
- all kinds of time units are available
Complicated case: event-based animation
- begin attribute can refer to events, e.g.:
  - obj.click, when a click occurs on obj
  - anim.end or anim.begin, when anim ends, resp. begins
  - anim.end; anim2.end, when anim or anim2 ends
  - anim.begin+4s 4 seconds afteranim begins
  - obj.mouseover, obj.mouseout when mouse moves over/out obj
  - ...

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