I accidentally reloaded the page on my phone, thus losing all my (meaningless, auto-complete generated) text. So maybe an auto-save would be better?
Years ago there was a lightweight app for the then-current version of Mac OS X called Grandview. When invoked, it would fill your screen with a background color and you would see only a huge version of the single word you were currently typing. (I don't remember, but I think it might have displayed the entirety of the last sentence after you ended it too.) It also deactivated your backspace key so you could only keep typing. That was peak focused writing, and it was an awesome app. I miss it, and similar, small apps that did one thing incredibly well.