Emoji like this http://www.emoji-cheat-sheet.com/.
Also list all internal support icons ?
When export, also export support icons ?
I think this will make text more colorful.
I would be happy if the icons were hosted on a proper cdn over https. I don't want StackEdit to host hundreds of png.
How about if we host the images on jsDelivr? More info https://hacks.mozilla.org/2014/03/jsdelivr-the-advanced-open-source-public-cdn/
Directly host on github ? Like a github pages ?
I would be happy for the program to just support Unicode emoji like 馃憤 and 馃槂. That should require no image hosting. See what happens currently:

I am also missing them. Count it as vote up :+1: on this enhancement/feature
I would second this request.
Aren't GitHub emoji on some CDN already? Would be nice to have them rendered in StackEdit.
Any update? I can see :smile: is working but line art, no color.
Support for :+1: and others has been added in v5. To support shortcuts like :-) you have to add this to your files properties:
extensions:
emoji:
shortcuts: true
I've added it in Settings > Custom settings. But it didn't work. Any extra seetings need to be added?
That would be in Menu > File properties > YAML properties, or you can add default file properties for all new files in the settings:
newFileProperties: |
extensions:
emoji:
shortcuts: true
Sorry to bother you
I'm using https://stackedit.io/app# on chrome browser. And usin the settings that you've shared. But it's not working

This will add properties to newly created files, so I guess it will work if you create a new file.
I've tried it in new file as well. Unfortunately it is not working.
You can request the GFM API whenever you find the :*: wildcard with the text and receive an emoji. For example, when you find :wave:, then you can request the GFM API with the payload as :wave: and receive back an emoji which you can replace :wave: for. In that scenario, you don't have to do hosting and Github does the hosting for you.
Most helpful comment
I would be happy for the program to just support Unicode emoji like 馃憤 and 馃槂. That should require no image hosting. See what happens currently: