[codebeaker]

I find the "100% Compatible with CommonMark" a bit confusing, without looking I'd assume CommonMark was another product from the same people, and they'd done a re-branding, and wanted to make the association.

That said, whilst writing this comment it occurs to me that CommonMark might also be an effort I've never heard of to standardise out some of John Gruber’s original undefined spec behaviours, but as a developer Github flavoured markdown is the de-facto standard as it has many well written and well-tested implementations.

[detaro]

http://commonmark.org/

> We propose a standard, unambiguous syntax specification for Markdown, along with a suite of comprehensive tests to validate Markdown implementations against this specification.

[sooheon]

You're right that it was an effort to pin down the markdown spec by not-Gruber people. And Github actually was involved, along with some other big names like Reddit, Stackexchange, and Meteor.

[unfamiliar]

But it didn't take off because Gruber threw a spanner in the works by refusing to endorse it and insisting they changed the name.