Scanner has rendering problems because we render diffs by getting an HTML string back from the differ and shoving it into an iframe. Unfortunately, that means the frame runs with extremely restricted security, so if it tries to load scripts or styles or images from https, it will fail, and if it tries to touch storage or cookies, it will throw an exception. A lot of the sites aren’t well coded to account for that, so the JavaScript code in them starts running but never finishes.

Solving this is kinda complicated and I’m not sure whether it is best done in the UI or DB layer

See Menu on Jan 18 scrape:
https://monitoring.envirodatagov.org/page/f4409490-e8f0-455d-ad8d-7ae0cf6aab74/0ad4bcbc-d751-44b0-bc41-434755416868..f690d39f-7f71-4fc7-93a4-89e7f01dfce8

Also:
https://monitoring.envirodatagov.org/page/dbd5f818-44a6-486c-a3ec-9b49cb6b72d0/9b7a5215-e2b9-42d1-857c-a2ef874c4f5b..d4cb9d0f-3042-4bfb-adde-e335f75a1ab0

Related to:
edgi-govdata-archiving/web-monitoring-db#91