A numbered feature tab list that advances on its own: the active tab expands to its description and a progress line fills while a large photo and a stat card crossfade beside it, in CSS via :has(), so the tabs still switch with no JavaScript. JS adds the auto-advance timer, the timed fill, arrow-key and tap support and a pause button. Section options: data-duration (ms, default 5000) time per tab; data-autoplay (true|false) advance on its own.