- Item details: a theme video from an item's
backdrops/folder now plays as the page's own backdrop, instead of a band of video above a black gap where the artwork should be. - Item details: on mobile the theme video fills the backdrop the artwork would have, rather than stacking above a second copy of the hero.
- New knob:
--ef12-detailsBackdropHeightholds the mobile details backdrop's height, which the theme video is sized against.