Emoji++
I love Markdown
As you can probably tell. And when I learned that : codes, also known as shortcodes, were part of the markdown spec and not just something that began existing in discord and other platforms, I knew I had to make something that made that possible in HTML. So, I made a script that scans through the entire document and dynamically replaces anything with : on either side of it with an emoji from github. And, the best part, is if the :colon_code_doesnt_match: it does nothing, but as you can tell, this one does something 
Unfortunately, there has to be a little delay for it to work properly on all pages. But I dont think it is that noticable. Also...
:hot: They dynamically resize...
to meet the fontsize of the parent element
Finally, here's a list of all of the emoji. It's pretty easy to make the list bigger as new emoji get released or to add custom ones (like my dancing blog :partyblob:). Simply take a look at either of these two links.