Report aria-label and aria-description even when parent has no visible children

[SaschaCowley]

Link to issue number:

Fixes #14514

Summary of the issue:

HTML figure elements with no accessible children (EG, all children set to aria-hidden=true) but with an aria-label or aria-description are not reported by NVDA.

Description of user facing changes

Elements with no accessible children but which have a label or description are now reported in browse mode. Note this only applies to elements which are still rendered; if all children are set to display: none, for example, NVDA still does not report the parent element.

Description of development approach

Render a single space in elements with no content but a label or description set.

Testing strategy:

Manually tested in Firefox and Edge, using the example markup provided by the OP.

Known issues with pull request:

N/A

Code Review Checklist:

• [x] Documentation:
  • Change log entry
  • User Documentation
  • Developer / Technical Documentation
  • Context sensitive help for GUI changes
• [x] Testing:
  • Unit tests
  • System (end to end) tests
  • Manual testing
• [x] UX of all users considered:
  • Speech
  • Braille
  • Low Vision
  • Different web browsers
  • Localization in other languages / culture than English
• [x] API is compatible with existing add-ons.
• [x] Security precautions taken.