A11y: Add containerRole parameter

[michaelbourne]

Clear and concise description of the problem

The Accessibility module currently allows for a aria-roledescription attribute on the slider container via the containerRoleDescriptionMessage option, but there is no support for setting a role to the same container.

As per https://www.w3.org/TR/wai-aria-1.1/#aria-roledescription, this is a slight violation of best practices, and my a11y auditors have flagged it as an issue to be fixed.

Suggested solution

Add a containerRole parameter to the Accessibility module so we can set the proper role (region) when setting the containerRoleDescriptionMessage option.

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

Would you like to open a PR for this feature?

• I'm willing to open a PR

[nolimits4web]

What is the issue? What does it do? What is it for? What does it fix? Why you can't just add aria-role with "hands" to HTML element?

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