That's a good idea. I'll have a think about a JS only example, although the reference pages have some, they log results to the console and so I thought some HTM

That's a good idea. I'll have a think about a JS only example, although the reference pages have some, they log results to the console and so I thought some HTML might be interesting to see. 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.