Hello World!
...
See https://kramdown.gettalong.org/syntax.html#footnotes
This requires setting this in _config.yml for GitHub pages:
markdown: kramdown
Naturally, the following example doesn't work with GitHub's markdown implementation (which is hard-coded for previews of markdown files), as even after 5 years since github/markup#498 was created, GitHub authors seem to refuse this for unexplained reasons...
... or not?
This is some text.1 Other text.2.
Another text with footnote.3