squint: say when a page is wider than its screen

A full-page screenshot is captured at the page's own content size, so a
page that scrolls sideways on a phone already came back wider than the
phone. That number was in every report and read as a size: an account
card pushed a status badge off a 390px screen and sat in thirty-odd
screenshots without anyone calling it a bug, until a person on a phone
reported it.

Width alone is not enough to act on. An absolutely positioned tooltip
bubble -- invisible at rest, still counted -- widens a page by forty
pixels with nothing drawn out there, and a check that reported that the
same way it reports clipped content would be ignored within a week. So
the shot also says whether anything is painted past the edge.

This is the one thing squint judges on its own, and it is the one that
needs no taste: content nobody can reach is not a matter of opinion.
Reported in both modes, whether or not anything moved, because a page
that was already too wide stays too wide until someone touches the file.

Against the revision that had the bug it names both, and tells them
apart:

  admin-accounts.phone.light   65px past the 390px viewport, with content out there
  admin-settings.phone.light   40px past the 390px viewport, nothing drawn out there

Zero false positives over the forty-two shots of a fixed tree.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01X1aAjLD4wvan3wsmkHPPh3

James Millscommitted 1 month agoparent 1f47e28936cf4ed608145b412f38f95096464826dc66846Browse files