Ukončení animace
*Po ukončení se objekt vrátí do původního stavu
*Opakování
*Forever, fixní doba, počet opakování
*Reverzní chod
*Vnořená animace může doběhnout dříve než rodič
*FillBehavior určuje, co se stane
A timeline may come to an end before its parent finishes. Or it may have no parent. In this case, the timeline enters its so-called ‘fill period’ – the time between the end of its inherent duration and the end of its parent timeline. (Or the time at which the UI closes if the timeline has no parent.)

There are two behaviors a timeline can exhibit in its fill period. It can either deactivate, in which case the property will revert to the value it had before the animation started. Or it can ‘hold’ – meaning that the animation’s final value continues to apply. (And if further animations target the same property, their effects will compose as discussed earlier.) The hold behaviour is the default. To deactivate at the end of the timeline’s duration, set the FillBehavior property to Deactivate.