A progressive web book… TW?
And it uses that url link convention of having a ‘degree’ symbol to indicate a link. That was suggested in that typography thread that was here a while ago. (did anyone do a style sheet for that?) anyway. Here’s the link.
https://www.onedayyoullfindyourself.com/how-to-read-this-book.html
Fun!
Indeed. But I can assure you, in this universe or any other, in this life or any other, there will never come a day when I’ll find myself opening a golf umbrella. 
I work for a large insurance company whose anonymity I feel very slightly obligated to protect, but which has a red golf umbrella logo and which sponsors a major golf tournament.
And I can say too that such a day will never come!