###Playback modes: Mutually exclusive. Can't be changed once initialised (create a new x-gif if you want a new mode) speed="1.0" (default mode) Plays back the GIF at its natural framerate multiplied by the value of the attribute. Can be updated and will have immediate effect. sync Defers playback to an external object. The DOM element will then expose a clock function to facilitate playback. Canno