This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
http://dev.w3.org/html5/webvtt/#h2_conformance "2.1 Conformance for authors" "2.2 Document conformance" Document conformance is usually a synonym for conformance for authors -- authors write documents, so requirements that apply to documents is the same as those that apply to authors. But the section titled "Document conformance" isn't about that. I suggest restructuring a bit, so that the text in 2.2 Document conformance is directly under Conformance, then rename "Conformance for authors" to "Conformance classes". That section can then separately discuss conformance for authors/documents vs conformance for UAs.
https://github.com/w3c/webvtt/pull/255