Comment by mdaniel
It's actually a standard! https://developer.mozilla.org/en-US/docs/Web/Text_fragments It can do a bunch of awesome stuff, but the text= one is the one I use the most
I finally started using it when it landed on Firefox release (although, in true Firefox fashion, they give no fucks about the UX forcing me to install an extension that is "create link to selection")
I too must thank you for this, I had no idea this existed and likely will be making regular use of it now :)