AccelerationRatio (optional)
This Double value represents the percentage of the Duration spent accelerating from zero to its maximum rate. This attribute must be set to a value between 0 and 1, inclusive. The default value is 0.
AutoReverse (optional)
This Boolean value determines whether the timeline will play in reverse after it has completed a forward iteration.
true
The timeline will play in reverse at the end of each forward iteration.
false
The timeline will not play in reverse. This is the default value.
BeginTime (optional)
This TimeSpan attribute determines when the timeline will begin. The default value is 0.
CutOffTime (optional)
This TimeSpan attribute determines when the timeline should end, relative to BeginTime.
DecelerationRatio (optional)
This Double value represents the percentage of the Duration spent decelerating from its maximum rate to zero. This attribute must be set to a value between 0 and 1, inclusive. The default value is 0.
Duration (optional)
This attribute determines how long the timeline should continue, not counting repetitions.
Automatic
The timeline automatically ends when its last child stops playing.
Forever
The timeline will continue playing indefinitely.
TimeSpan
The value of this attribute is a time span.
FillBehavior (optional)
This value determines how the animation will behave once it has completed but while its parent is still active.
Deactivate
The Timeline is turned off when its parent is no longer active.
HoldEnd
The Timeline holds its progress until the end of its parent's active and hold periods.
RepeatBehavior (optional)
This attribute determines how the timeline will repeat its Duration, if at all.
Forever
The timeline will repeat indefinitely.
IterationCount
The timeline's behavior is determined by this value. A value of 1.0 means that the timeline will execute exactly once. A value of 2.0 means that the timeline will execute twice. A value of 0.5 means that the timeline will execute only half of its intended duration. An IterationCount is specified using the following syntax: RepeatBehavior="2x", where 2 is the desired iteration count and x is a keyword that indicates the type of RepeatBehavior being declared.
RepeatDuration
The timeline will repeat for the amount of time specified by this value. A RepeatDuration is specified by declaring the RepeatBehavior as a TimeSpan, e.g., "0:0:5" specifies a RepeatDuration time of five seconds.
SpeedRatio (optional)
This Double value specifies the rate of movement over the Duration. The default value is 1.0.
Freezable 
Animatable