prohibit aria-roledescription from role=generic

[scottaohara]

closes #1140, pending answering comment about note

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[mtrootyy]

aria-brailleroledescription also should be prohibited on role generic for the same reason.

[pkra]

aria-brailleroledescription also should be prohibited on role generic for the same reason.

👍 (But it's less of a problem since the spec says that UAs must not expose aria-brailleroledescription if there's no valid aria-roledescription.)

[scottaohara]

agreed, though still not a bad idea to be explicit :) making a commit to add this now.

[carmacleod]

+1 (with or without note)

[jnurthen]

@scottaohara Can you please remove the commit prohibiting brailleroledescription on generic from this PR. I can't merge that to the 1.2 branch (which is the desire for this) as we won't have brailleroledescription there. We can ask @pkra to add that to #1097

[scottaohara]

@jnurthen removed it.

[jnurthen]

I have an open question:
Do we want to add a prohibition on user agents exposing aria-roledescription if it is set on a generic? Currently prohibited only says Authors MUST NOT - it has no restriction on user agents (and we want to keep it that way). On the other hand aria-roledescription could have this prohibition in the 2nd bulleted list by adding a 3rd bullet:
"User agents MUST NOT expose the aria-roledescription property if any of the following conditions exist:

• The element to which aria-roledescription is applied does not have a valid WAI-ARIA role or does not have an implicit WAI-ARIA role semantic.
• The value of aria-roledescription is empty or contains only whitespace characters.
• aria-roledescription is prohibited on the explicit or implicit WAI-ARIA role."

(please wordsmith as appropriate)

[carmacleod]

Attempted wordsmithing of 3rd point, above:

The element to which aria-roledescription is applied has an explicit or implicit WAI-ARIA role that prohibits aria-roledescription.

...and make it the 2nd point instead?

[mcking65]

I think it is important to have this UA restriction language in roledescription before merging:

The element to which aria-roledescription is applied has an explicit or implicit WAI-ARIA role that prohibits aria-roledescription.

[jnurthen]

@scottaohara pushed a change - can you take a look

[scottaohara]

i think that looks good, thank you @jnurthen, sorry i didn't get to adding it sooner.

[mcking65]

Looks good.