I was wondering, if there is a page, repository or similar with a complete (and I mean complete) list of all Markdown features GitHub offers, being it direct markdown features (formatting) or GitHub-only features (links to commits/SHA refernces)

The only pages I found are https://guides.github.com/features/mastering-markdown/ and https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet

The first one only lists the basic features GitHub provides and the second one does this too with some small alterations and additions.

There are quite a few features that are missing from the page and are never mentioned anywhere.

For example did I randomly discover that you can put a hex color code in inline code to then display a small icon next to it.

Example: 

Additionally does the markdown page display outdated(?) formatting? Like f.e. does an ordered list with an intend unordered list (no longer) work with just two spaces and requires three/four spaces.

Tl;dr The cheatsheet misses a lot of useful information that people might wanna use when opening issues or creating wiki pages, which is sad.

So I hope there is an actual page containing all (known) markdown and GH-markdown features to use.