Screen-reader-only spans were position:absolute with no offsets, so inside
the horizontally-scrolled kanban columns they rendered off-screen-right and
ballooned documentElement.scrollWidth to ~1388px on a 390px viewport. That
triggered iOS Safari shrink-to-fit zoom-out (the "cut off, zoomed out" view,
which persisted into list view) and let the whole page pan, dragging columns
off-screen. Pinning the utility to its containing block origin (top/left: 0)
keeps the document locked to the viewport; the span stays 1px and clipped.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
3cc82bdc4c