[patch][CCLA] dijit.TitlePane: missing aria-labelledby and invalid roles on locked pane

[mikeb]

The dijit.TitlePane? containerNode has "role='region'" but according to WAI-ARIA specification anything with "role='region'" also should have a label or title (this is for JAWS screen reader accessibility navigation by region).

Patch fixes this by giving the titleBarNode an ID and then using aria-labelledby on the containerNode pointing back to the titleBarNode.

Also fixes a problem where a "locked" TitlePane? had an invalid aria-pressed attribute on the titleNode. This was because setting locked to true also correctly changed the titleBarNode's role from "Button" to "heading" but did not remove the aria-pressed.

Finally the patch fixes up the test page to be more accessible.

[mikeb]

adds aria-labelled by on titlePane, fixes locked pane role, please proxy commit for Michael Billau (CCLA on file with IBM)

[bill]

Thanks, looks good.

[bill]

In [29489]:

Add aria-labelledby for TitlePane?, fixes #15853 on trunk/, thanks Michael Billau (CCLA on file with IBM), !strict

[bill]

In [29490]:

Add aria-labelledby for TitlePane?, fixes #15853 on 1.8/ branch, thanks Michael Billau (CCLA on file with IBM), !strict

[bill]

#17735 is a duplicate of this ticket.