Output of child elements

[JAWS-test]

The AccName and ARIA specification says nothing about the output of child elements when a parent element is labeled. This should be added. Best for each role, in the table with the properties of the role. In addition, a chapter could be inserted into APG, where all roles are listed, to which it applies that their content is visible with explicit label or not (analogous to implicit role=presentation: https://w3c.github.io/aria-practices/#children_presentational).

Example:

<nav aria-label=test>content</nav>

Here the text content in the region is output as soon as you navigate into the region.

<button aria-label=test>content</button>

Here the text content of the button is never output.

So the question is: For which elements are child elements not output?
One could assume that it applies to all elements whose children implicitly have role=presentation. But this is probably not true, because a link does not implicitly have role=presentation, but I would expect a link is output without its content, if it was labeled with aria-label or aria-labelledby.

During the discussion on w3c/accname#59 it was agreed that this is a topic for the ARIA specification and HTML AAM and not for AccName.

See also: #1028, w3c/html-aam#160, w3c/accname#59.

[jnurthen]

This is a duplicate of #683