2018-04-03 UTC
# 
tantek aaronpk, since microformats2 started as a brainstorm, and then got incrementally formalized, there's a dividing section between the top of the page (more formal) and the original brainstorming: http://microformats.org/wiki/microformats2#About_This_Brainstorm (note that VENDOR_EXTENSIONS is below that on that page)