[mod]

I loaded this up on a surface tablet--it renders larger than my viewport, but with no scrollbar.

I was able to zoom out and see everything, but some people don't know (or wouldn't think of) that trick.

[dmitrygr]

Designed for personal use as a PWA specifically on my iPhone. I migrated from android where i had a TI-89 emulator app. No such thing exists for iOS. Usability by others was never a requirement :)