I know that #3807 talks about Refresh, but it's filed about http-equiv in general, which is a different kettle of fish.

Some UAs, e.g. wget as of 2019 don't support Refresh. User facing browsers all do, because as noted elsewhere, the web doesn't work if they don't support it.

It finally was recorded in the Standard in whatwg/html # 2892 -- but this was long after it was implemented (by decades).

It'd be handy to be able to link to caniuse.com when I'm writing PRs to use it instead of pointing to the standard, or the pr that added it to the standard, or at present, the mdn issue asking them to document the item.

Thanks.