The previous error framed every small frame as "page didn't load", which
the Codex review flagged as misleading: PNG size is dominated by entropy,
so a fully loaded flat-color UI, sparse empty state, or small viewport
can legitimately serialize below 20 KB. The new wording leads with the
entropy point, names the legitimate small-frame cases, and explicitly
calls out --min-frame-bytes 0 (and smaller positive values) as the
recovery path.
Trevin Chow
4b5c8e4637