Selected (aria-selected=true) state is not announced for selected options inside a listbox

[dobrinyonkov]

Steps to reproduce:

1. open https://cookiecrook.com/test/aria/multiselect/listbox.html
2. select some of the options
3. start NVDA
4. navigate to last option - using arrow down key
5. navigate to first option - using arrow up key

Actual behavior:

Upon navigation, Selected (aria-selected=true) state is not announced for selected options.
Only Not Selected (aria-selected=false) is announced.

Expected behavior:

Selected (aria-selected=true) state to be announced for all selected options.

System configuration

NVDA installed/portable/running from source:

installed

NVDA version:

2021.2

Windows version:

Version 10.0.19042 Build 19042

Name and version of other software in use when reproducing the issue:

Chrome Version 94.0.4606.61 (Official Build) (64-bit)

Other information about your system:

Other questions

Does the issue still occur after restarting your computer?

YES

Have you tried any other versions of NVDA? If so, please report their behaviors.

2020.*

If NVDA add-ons are disabled, is your problem still occurring?

YES

Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?

YES

[feerrenrut]

Only announcing one of the states (selected vs not selected) reduces verbosity, the other state is implied.
When considering this behavior in the context of a standard listbox (no multi select) this makes a lot more sense, the item focused IS selected, the user doesn't have to hear selected / vs not selected at all.

The UX for multiselect list box is extending this convention.

Note, in the example, checking the dev tools (accessibility tab) shows multiselectable = false. Adding aria-multiselectable="true" fixes this. However, I don't believe this changes the behavior of NVDA.

See also #4816

A case could be made that this behavior is confusing, especially for new users. If you'd like to discuss this side of it more I can re-open.