Footnotes in HTML5.1

Today on the call regarding the Accessibility Task Force wish list for
HTML5.1 I suggested a footnote element. Janina mentioned that footnotes
work in Daisy players very well. I took an action item to lookup the syntax
in Daisy...  I find the following 2013 post by Prashant Verma, a Daisy
trainer and member of the consortium:

The footnote reference looks like this - <noteref idref="#footnote-0"
class="Footnote">0</noteref>

And the footnote text is-<note id="footnote-0" class="Footnote">0 This is
the explanation of the highlighted term</note>

In the above code "0" may be replaced with any other number. When replaced
by "1" it will look like this.

<noteref idref="#footnote-0" class="Footnote">1</noteref> <note
id="footnote-0" class="Footnote">1 This is the explanation of the
highlighted term</note>

Source: See the second post http://www.daisy.org/forums/18892

And the Daisy 3 standard says this about regions.

REGION

*region (CDATA, IMPLIED):* Specifies the region (defined in layout in
document head) in which the text will be presented. References the id of
the appropriate region. All types of text objects that are to appear in the
same rendering space would be assigned the same value for region. For
example ... notes (e.g., footnotes) might be displayed in a separate area
at the bottom of the screen (region="notes").

Chaals wondered if this could be explored as a wider use of longdesc,
Cynthia said Microsoft was working on moving some of the MS Word footnote
syntax into ARIA 1.1 (But that would report to the API, it wouldn't have
any jumping or opening behaviour)

I think it would be great to have a working <noteref> and <note> elements
that opens (and/or jumps) to the footnote and returns the user back to
footnote.