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The spec currently does not seem to make clear what heading must be using for <section><hgroup>foo<h1>bar</h1></section></body> in a document outline. All the existing implementations of the outline algorithm I've tried use "bar", but I cannot find any statements in the spec that actually require that instead of requiring it to be "foo". The current text of the outline algorithm makes no special mention of handling for hgroup at all -- it's just handled as "heading content" along with h1-h6 elements. So I think somewhere the spec needs to make clear that the text child nodes of hgroup never represent a heading.
Checked in as WHATWG revision r7699. Check-in comment: Clarify hgroup's definition http://html5.org/tools/web-apps-tracker?from=7698&to=7699