OptionaldisturbanceDelay of the start of the animation between 2 elements defined inside the selector.
The total duration of the animation will be: duration+count*itemDelayDuration.
OptionalgroupingApplies a modulus division to the elements defined in the selector when
it relates the itemDelayDuration.
A itemDelayDuration=2, will make the odd elements to have the same
itemDelayDuration.
Applies a random changes with maximum of
itemDelayDisturbanceto theitemDelayDurationfor each element defined by the selector.