DX Life's /pray at 1440 kept the pill at the viewport's bottom until the map's bottom came into view: the page
scrolls a container, not the document, so the document-only test saw a full-screen page and kept the fold.
pageScrolls now also walks out from the pill, across shadow roots, for an ancestor scroller whose content is
taller than it; a map wholly below or above the viewport is treated as on a scrolling page; and a lift is
cleared when the pill goes off screen, so a lift set while the map was half visible does not survive into the
next view. check:pin-hint-floor adds the inner-scroller, shadow-crossing and map-below-the-fold fixtures; its
self-test refuses 9 planted defects.
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