output element is a labelable element

[scottaohara]

The output element is a labelable element and as such, its naming algorithm should be updated to indicate this.

Presently the algorithm is:

1. aria-label and aria-labelledby
2. subtree
3. title
4. no name

Should be updated to:

1. aria-label and aria-labelledby
2. name from label element
3. title
4. no name

edit: subtree shouldn't be considered for name. name AND subtree need to be announced by the output live region and should not just announce name.

[dd8]

Some other elements are defined as 'labelable elements' by the HTML Standard but the label isn't used in the accessible name calculation:
https://html.spec.whatwg.org/multipage/forms.html#category-label

button
https://w3c.github.io/html-aam/#button-element-accessible-name-computation

input type="button" , input type="submit" and input type="reset"
https://w3c.github.io/html-aam/#input-type-button-input-type-submit-and-input-type-reset

meter
progress
no name calculation - these don't seem to fall into any of the general categories since they're not form-associated elements and aren't text level elements (e.g. you can use a progress bar to indicate progress without a form, and use a meter in to display data like current temperature)

select
It's not mentioned explicitly so it falls into https://w3c.github.io/html-aam/#other-form-elements (so only allows a single label)

and form-associated custom elements

[scottaohara]

yes, thank you. all of these are being covered in my pending update.

[scottaohara]

anything not output related will be covered in other issues. such as: #210 (comment)