RE: [A11Y] Issue 16

I was assigned Matt's issue 16.
 
Below is what I have found:
 
 
***Begin what is in our note now
2.8 Deeply Nested Heading Levels Best Practices
 
Digital publishing use cases exist to support encyclopedias and similarly detailed reference works containing many levels of headings.
 
It is not easy to determine what best practice is for deeply nested headings, headings that go beyond <h6>. Best Practices should be clearly established
and easy to find. Use cases in books are more frequent than other circumstances. This is likeliest to occur if an <aside> begins with <h5> or <h6>.
 
The Gap: Current W3C WAI Specifications and Guidelines do not address what are considered implementation guidance to non-assistive technology users.
 
Potential solution for addressing the gap: Add specific guidance related to supporting deeply nested heading levels in reference works to W3C WAI Specifications,
Guidelines, and Tutorials.
 
***End what is in our note
*** Begin WAI guidance
At:https://www.w3.org/WAI/PF/aria-practices/#kbd_layout_nesting
3.2.7.3.1. Header Levels Versus Nesting Levels 
 
GK:The issue is touched on, but not explicitly.
 
And from:https://www.w3.org/WAI/GL/WCAG20-TECHS/ARIA12.html
Example 2: Additional heading levels
 
This example demonstrates how to implement a level 7 heading using role="heading" and the aria-level attribute. Since HTML only supports headings through
level 6, there is no native element to provide these semantics.
 
...
<h5>Fruit Trees</h5>
...
<h6>Apples</h6>
<p>Apples grow on trees in areas known as orchards...</p>
...
<div role="heading" aria-level="7">Jonagold/div>
?  <p>Jonagold is a cross between the Golden Delicious and Jonathan varieties...</p>
*** end WAI guidance
 
Conclusion by George:
 
I think somewhere in WAI authoring guidelines the reference to publishing with deeply nested headings needs to reference the above ARIA technique.
 
Is that what we want to say?
 
Best
George
 
 
Best
George