deeply nested headings

Hi,

In book publishing, there is occasionally a need to go beyond a level-6 head (really).

Building on [1] and [2], what is the best (and most future-proof) method for marking up these deeply nested headings in an accessible way? I have seen recommendations to re-use <h6>, but how will AT interpret this?

I have seen the following proposals:

<h6 aria-level="7">
<h6 aria-label="h7">
<p role="heading" aria-level="7">Level 7</p>

I have my reservations about all of them. What do you recommend?

[1]  https://lists.w3.org/Archives/Public/w3c-wai-ig/2014JulSep/0040.html
[2] http://www.deque.com/blog/accessible-html-heading-markup/

Thanks,
Tzviya

Tzviya Siegman
Digital Book Standards & Capabilities Lead
Wiley
201-748-6884
tsiegman@wiley.com<mailto:tsiegman@wiley.com>