Just an FYI, but the sup and sub tags are actually from HTML, not markdown language...I don't suppose it's not too late to change the title?

Markdown typically uses characters, like asterisks, hyphens, and underscores, to show what needs to be formatted and how.

HTML uses tag words (usually abbreviated) couched within <>, and almost always with a closing tag, the word of which starts with a forward slash /.

Both almost always use an opening and a closing tag.

If you're interested in learning more, I'm doing a series of articles on what I've discovered (although I will probably not delve deeply into HTML & CSS). 😉