bug(a11y): assertive toast not announced #25866

Prerequisites

• I have read the Contributing Guidelines.
• I agree to follow the Code of Conduct.
• I have searched for existing issues that already report this problem, without success.

Ionic Framework Version

• v4.x
• v5.x
• v6.x
• Nightly

Current Behavior

The toast message in not announced by screenreaders even with aria-live='assertive'.

Tested with:

• Ionic 6.2.4
• NVDA 2022.2.2 on Chrome and Firefox
• JAWS 2022.2207.25 ILM on Chrome and Firefox

Expected Behavior

According to ARIA live regions spec:

aria-live="assertive" should only be used for time-sensitive/critical notifications that absolutely require the user's immediate attention. Generally, a change to an assertive live region will interrupt any announcement a screen reader is currently making. As such, it can be extremely annoying and disruptive and should only be used sparingly.

So I expect assertive toast message to be announced when toast is shown.

Steps to Reproduce

• Checkout v.6.2.4
• npm install in ./core
• npm start
• go to http://localhost:3333/src/components/toast/test/a11y using Chrome/Firefox
• launch NVDA/JAWS
• click on 'Present Assertive Toast'
• no announcement

I could provide a demo app using @ionic/angular, but I need to test the toast behaviour with JAWS (with NVDA on Chrome/Firefox is not working).

Code Reproduction URL

No response

Ionic Info

[WARN] You are not in an Ionic project directory. Project context may be missing.

Ionic:

Ionic CLI : 5.4.16

Utility:

cordova-res : not installed
native-run : not installed

System:

NodeJS : v14.17.1
npm : 6.14.13
OS : Linux 4.4

Additional Information

No response