Type
Media item
Available from
Body, Parallel, Sequence
Purpose
The parallel container defines a simple time grouping in which multiple elements can play at the same time.
Behavior
By default, elements within a parallel container play at the same time. You can set various properties on the media itself to control the playback such as timing offsets, duration, repeats. You can also nest parallel and sequence elements under this container.
Properties
- End Sync - Determines how to end the sync as a function of child media elements. The End Sync option can have one of the following values:
- first - The par, excl, or media element's implicit duration ends with the earliest active end of all the child elements. This does not refer to the lexical first child, or to the first child to start, but rather refers to the first child to end its (first) active duration.
- last - The par, excl, or media element's implicit duration ends with the last active end of the child elements. This does not refer to the lexical last child, or to the last child to start, but rather refers to the last active end of all children that have a resolved, definite begin time. If the time container has no children with a resolved begin time, the time container ends immediately. If child elements have multiple begin times, or otherwise restart, the child elements must complete all instances of active durations for resolved begin times. This is the default value for par and excl elements.
- all - The par, excl, or media element's implicit duration ends when all of the child elements have ended their respective active durations. Elements with indefinite or unresolved begin times will keep the simple duration of the time container from ending. When all elements have completed the active duration one or more times, the parent time container can end.
- media - The time container element's implicit duration ends when the intrinsic media duration of the element ends. This must be defined by a host language. If the time container element does not define an intrinsic media duration, the host language must define the simple duration for the element. This is the default value for media time container elements.
- Id-value - The par, excl, or media element time container's implicit duration ends when the specified child ends its (first) active duration. The id must correspond to one of the immediate timed children of the time container.
- smil1.0-Id-value - This is a SMIL 1.0 identifier value of the form "id(" IDREF ")". The semantics are identical to those of the Id-value immediately above. This syntax is deprecated.
- Fill - Determines the action to take after an active duration. The Fill option can have one of the following values:
- remove - Specifies that the element will not extend past the end of the last instance of the simple duration.
- freeze - Specifies that the element will extend past the end of the last instance of the simple duration by "freezing" the element state at that point. The parent time container of the element determines how long the element is frozen (as described immediately below).
- hold - Setting this to "hold" has the same effect as setting to "freeze", except that the element is always frozen to extend to the end of the simple duration of the parent time container of theelement (independent of the type of time container). For profiles that support a layered layout model (e.g., SMIL 2.0 Language Profile), held elements (elements with fill="hold") will refresh their display area when a layer is added on top then later removed.
- transition - Setting this to "transition" has the same effect as setting to "freeze", except that the element is removed at the end of the transition. This value is only allowed on elements with media directly associated with them. If specified on any other element (e.g. a time container element in the SMIL language profile), the attribute is ignored. See the SMIL Transitions module.
- auto - The fill behavior for this element depends on whether the element specifies any of the attributes that define the simple or active duration. If none of the attributes dur, end, repeatCount or repeatDur are specified on the element, then the element will have a fill behavior identical to that if it were specified as "freeze". Otherwise, the element will have a fill behavior identical to that if it were specified as "remove".
- default - The fill behavior for the element is determined by the value of the fillDefault attribute. This is the default value. If the application of fillDefault to an element would result in the element having a value of fill that is not allowed on that element, the element will instead have a fill value of "auto".
