This is the issue tracking repository for Digital Publishing WAI-ARIA Module (dpub-aria). You can read the Editor's Draft version of the specification here.
You can also compare against the most recent published version here.
To view the source of the specification, please see the main ARIA repository where the specification lives. This specification is part of the ARIA suite, and uses the same code structure and build tools as other ARIA suites. General information about contributing to the specifications is in the main ARIA repository readme.