Blog post author here in case there's any feedback or questions. Thanks for sharing :)
Maybe one self-contained example w/ a new function you can copy/paste into the console to play around with would be cool.
I was mostly using it as a test to see if it worked in Chrome so I could start using it.
Maybe it's interesting for you: the method pages have compat data at the bottom so you can see what's supported and in which browser release.