OptionalautoplayOverlay ids in step order. The sequence owns these and nothing else. Compared by content, so a fresh array literal is fine.
OptionalloopWrap at both ends (and keep playing past the last step). Default false: the sequence clamps, and playback pauses on the last step.
Optionalmode"single" shows only step N's overlay; "cumulative" shows steps 0..N together. Default "single".
OptionalspeedInterval between steps while playing, in ms. Default 1000.
Start playing on mount. Default false.