When the website is loaded in unsupported desktop browser (or, I assume, gets crawled as well), the page does not scroll.
This is due to initial overflow-y: hidden set for the splash screen, but due to JS errors and such, the “application” never gets started and never receives the chance to remove the attribute.
This version is supposed to be read-only, but you can’t read since there’s no scrolling. I assume the same issue applies when it’s being saved by Wayback Machine, crawlers, etc.