The URL of this page is also the URL for interacting with the Git repository of the Markdown Extra Specification. With Git installed, you can create a local copy of this repository with the following command:
git clone http://git.michelf.ca/md-x-spec
Once you've cloned the repository this way, a “md-x-spec” folder has been created and its content should reflect the current state of the repository.
If you later wish to update your local branch to the latest available version use:
git pull
Refer to the Git documenation to learn more about using Git.