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- data-playback-rate: per-element slow-mo/fast-forward (0.1-5x range) Multiplied with global transport rate. Affects timeline duration calculation when source duration is used as fallback. - loop: native HTML loop attribute now works correctly in the runtime. Wraps media playback from mediaStart when source reaches end. Enables looping short clips over longer durations. Both follow the existing data-media-start/data-volume pattern.