The React implementation of the Modal component should support role="alertdialog"

[FrivalszkyP]

Detailed description

WAI-ARIA 1.1 describes an alertdialog role. To quote:

Dialogs are most often used to prompt the user to enter or respond to information. A dialog that is designed to interrupt workflow is usually modal. See related alertdialog.

Carbon already supports the danger={true} prop which, in my opinion, should go hand in hand with an alert prop that changes the role of the modal from dialog to alertdialog.

When an alertdialog role is set, assistive technology can announce the contents of the dialog upon being displayed, much like the contents of a role="alert" element are announced. This is desirable for dialogs that should interrupt workflow (see the ARIA description above).

It is also important that the WAI-ARIA guidelines state that a role="alertdialog" element should be supplied with an aria-label or aria-labelledby attribute as well as an aria-describedby attribute. The former is already taken care of by the Modal component, but an aria-describedby attribute should be added for alertdialogs that should point to the body text of the modal (i.e. the element that contains the props.children).

[dakahn]

Seems sound to me while referencing the APG here
https://www.w3.org/TR/wai-aria-practices-1.1/#dialog_modal

Transferred this from a bug report to an enhancement request.

[FrivalszkyP]

Great! You can take a look at #5955 to see if it covers the issue.