CommonMark also supports code blocks with language hints (using the ```lang... syntax). What Org-mode has, in addition to code blocks with language hints, is inline code with language hints, which neither CommonMark nor GFM support.
tables
I'm horrified that, indeed, CommonMark doesn't have tables, though you're right that most people now just use GFM.
Comments
CommonMark also supports code blocks with language hints (using the ```lang... syntax). What Org-mode has, in addition to code blocks with language hints, is inline code with language hints, which neither CommonMark nor GFM support.
I'm horrified that, indeed, CommonMark doesn't have tables, though you're right that most people now just use GFM.