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The "Contexts in which this element can be used" section for <dialog> says: Where flow content is expected. As a child of a dt element. As a child of a th element. But dt and th both already allow flow content, so I don't understand why they are called out separately here. Also, the content-model sections for dt and th don't make any specific mention of <dialog> (I assume because they don't need any specific mention of it, since it's already part of flow content).
Oh wow, I forgot that we allowed flow content in those. I thought we only allowed phrasing content.
Checked in as WHATWG revision r7901. Check-in comment: Remove redundant non-normative text that was just based on my forgetting what the spec said, oops http://html5.org/tools/web-apps-tracker?from=7900&to=7901