This is the source for the Web Speech API spec.

For normative changes, a corresponding web-platform-tests PR is highly appreciated. Typically, both PRs will be merged at the same time. Note that a test change that contradicts the spec should not be merged before the corresponding spec change. If testing is not practical, please explain why and if appropriate file a web-platform-tests issue to follow up later. Add the type:untestable or type:missing-coverage label as appropriate.