I also had an issue that restarted my computer and found the hard way it doesn't save. Using localStorage to store the state is simple enough, unfortunate that it doesn't.

When that happened to me, a simple ⌘0 reset the size.

what device has both zoom tapping and apple's ctrl button?

Literally every Mac with a trackpad, which includes every laptop.

It’s not “Apple ctrl button”, it’s the “command” key. Macs have a “control” key too.

Ditto. It was also running at about 3 fps on my iPhone 12 on safari.

It was a nice shopping trip worth of fun though.