For example, a gist of the HTML for this blog entry can be seen here: https://gist.github.com/jaycfields/82e2cc0a588bd83a91f4. If I want someone to give me feedback on the rendered output, that gist isn't very helpful.
It turns out, it's really easy to see that HTML rendered: switch the file extension to
md. Here's the same gist with a md extension: https://gist.github.com/jaycfields/e383b12b6ff9bd49c40a This all works due to the way Github renders markdown gists, and markdown supporting inline HTML.
I wouldn't use this trick to create any data you'd like to have online in the long term, but it's great for sharing short lived HTML.