List the SMIL timing elements and attributes.
- SMIL timing Elements:
<excl> Specifies elements that are to be exclusively displayed
<par> Specifies elements that are to be displayed in parallel
<seq> Specifies elements that are to be displayed in a sequence
- SMIL timing Attributes:
begin - Specifies the delay before the display of the element
dur - Specifies the duration for the display
endsync - Synchronizes the stopping of parallel elements
repeatCount - Specifies the number of repetitions for the display
