Chapter: quality
Rule: pageError
Spec: Uncaught JavaScript
Uncaught JavaScript crashed the page. This is not a console.error and not a field message — the script threw.
The tab can die; users cannot continue. Not this: a junk fill that should have been a field error (Q-03); a logged console.error while the page still runs (Q-14).
This id is stable. Reports link here so T/V/Q classes do not shuffle when a soak ranks differently.