the real Github markdown doesn't support footnotes, but this project does

[ellisonch]

Footnotes like

blah blah[^1] blah blah
...
[^1]: Footnote

Are supported in jbt/markdown-editor, but they are (shamefully) not supported in the real github (https://github.com/github/markup/issues/498) When I wrote up my readme, your editor tricked me :)

[ncovercash]

Is this a bad thing?

[ellisonch]

If your goal is to match the "GitHub-Flavored" markdown, then yes, because this is too permissive.