To quote Markdown#CommonMark
From 2012, a group of people including Jeff Atwood and John MacFarlane launched what Atwood characterized as a standardization effort. A community website now aims to "document various tools and resources available to document authors and developers, as well as implementors of the various markdown implementations". In September 2014, Gruber objected to the usage of "Markdown" in the name of this effort and it was rebranded as a new dialect named CommonMark. CommonMark.org published several versions of a specification, reference implementation, and test suite, and "[plans] to announce a finalized 1.0 spec and test suite in 2019."
- The Future of Markdown, author: Atwood, Jeff, publisher: CodingHorror.com, date: 2012-10-25, accessdate: 2014-04-25
- Markdown Community Page, author: unknown, , publisher: GitHub, date: unknown, accessdate: 2014-04-25
- Standard Markdown is now Common Markdown, author: unknown, , publisher: Jeff Atwood, date: unknown, accessdate: 2014-10-07
- Standard Markdown Becomes Common Markdown then CommonMark, author: unknown, , publisher: unknown, date: unknown, accessdate: 2014-10-07
- CommonMark, author: , , publisher: unknown, date: , accessdate: unknown