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+++ This bug was initially created as a clone of Bug #22002 +++ "These categories are related as follows:"
zcorpan: Can you elaborate? I don't understand.
http://www.whatwg.org/specs/web-apps/current-work/#kinds-of-content the diagram is missing <main>. But it seems it is present in the WHATWG spec. Not sure if that was the case when I cloned the bug...