Re: revisiting <hgroup> in HTML

I wasn't suggesting <subline> as a wrapper for <h2> but as an alternative.

That is, I was talking more in terms of a slogan / description element
which would not be heading-related (ie. it doesn't introduce anything
structurally). Such an element could be used after headings or elsewhere.

If the use case is for a subheading, it should be called <subheading>. In
which case, it should

1. Not affect the document outline
2. Be considered "important" (in terms of keyword deployment etc.)
regardless of (1)
3. Ship with advise to say it should only be used directly after headings,
like <dd> can only be used after <dt>

User agents can decide whether the <subheading> text is to be paired with
the text in the nearest preceding heading. I'm not sure what a sound
implementation of this would be. Is the subheading part of the heading -
part of the label for that section - or is it more tangential?