# Crossfade Transition Transition definition is placed inside `` tag in SMIL file ``. - The `xml:id` or `transitionName` is the ID of the transition used later in the playlist - `type` defines the behavior of the transition. Only `fade` is currently supported - `subtype` visualization of the transition. Only `crossfade` is currently supported - `dur` duration of the transition (How long it will take to transition from one image to another). Specified in seconds, *supports* decimal values (0.6s) ```xml ``` ### Default transition SMIL player supports default transition for the whole playlist. It is defined in the `` tag of the SMIL file. The transition will be applied to all images in the playlist that do not have a different transition defined directly. ```xml ``` The value in the defaultTransition attribute is the ID of the transition defined in the layout tag. It has to match.