Add an hgroup Example with Multiple h1 Elements

[patrickdark]

Reference URL:
https://html.spec.whatwg.org/multipage/semantics.html#the-hgroup-element

The spec doesn't make it clear whether or not I can add equivalent headings for content. I'm trying to do something to the effect of:

• List Title 1
• List Title 1 Alternative
• List

In theory, this should be doable with:

<hgroup>
    <h1>List Title 1</h1>
    <h1>List Title 1 Alternative</h1>
</hgroup>
<ul>[...]</ul>

However, the only example utilizing the hgroup element in the spec shows how to create a subtitle, and the spec has this confusing text: "Other elements of heading content in the hgroup element indicate subheadings or subtitles". The quoted text indicates that the second h1 element might be considered a subtitle of the first h1 element.

Edits: I had to reformat the post with Markdown since HTML is apparently interpreted. I modified the phrasing of the last paragraph.

[annevk]

So I think @Hixie didn't mean for this to be a thing. Only the first heading would be the actual heading. So we should probably make it clear that only the first heading element is the actual heading, and the remaining contents are (a) subtitle(s).

[sideshowbarker]

See #1544 for an attempt at clarifying this.