Notification accessibility

[mattrosno]

Summary

Currently, our Notification components support rendering interactive content inside of the notification itself. This content includes components like links or buttons. Unfortunately, Notifications in their current implementation are unable to correct relay this information to screen readers as all semantics are stripped in the content of a notification.

This update to Notification will include some research in order to figure out the correct way to provide accessible options for both text-only notifications and notifications with action items.

Job stories

1. When using a notification component, I want it to be accessible for screen readers and keyboard interaction, so the content can be available to all without stealing focus.

Success measures

1. Toast notifications are updated to not contain interactive children (actions)

Sponsoring team

Carbon team

[mattrosno]

Epic: carbon-design-system/carbon#8406

Discussion: carbon-design-system/carbon#8533

[mattrosno]

Release notes: https://github.com/carbon-design-system/carbon/releases/tag/v10.36.0

[tay1orjones]

This is pretty well complete based on the success measure outlined above. It's not officially released yet though since it's all breaking changes wrapped into v11.