fix(overlays): do not hide root when toast appears

Issue number: stemmed from #29773

What is the current behavior?

Certain Chrome and Edge versions (confirmed: Chrome v127, v128, v129 and Edge v127) would indicate that certain elements have an accessibility violation:

Blocked aria-hidden on a "ELEMENT NAME" element because the element that just received
focus must not be hidden from assistive technology users. Avoid using aria-hidden on a
focused element or its ancestor. Consider using the inert attribute instead, which will also
prevent focus. For more details, see the aria-hidden section of the WAI-ARIA specification at

This issue happens when a toast appears and the users clicks on any element that is not related to toast. This is due to the main content having an aria-hidden so users should not to be able to interact with any of those elements. This isn't an issue when an overlay uses a backdrop, like ion-alert because the backdrop prevents a user from interacting with those elements.

What is the new behavior?

When toast is present, the main content no longer has an aria-hidden. This aligns with accessibility guidelines. I also verified with other Framework, MD states "Don't trap focus in the snackbar. Users should be able to freely navigate in and out."

Does this introduce a breaking change?

[ ] Yes
[x] No

Other information

Dev build: 8.3.4-dev.11729879684.1ea28919

Clone this repo
Install deps
Run the app on a private browser (Chrome v127, v128, v129 or Edge v127)
Open browser console
Click on "Open Toast" button
Click on any element other than "Open Toast" button, like "Open Popover"
Notice the error message
Close private browser
Install dev build: npm install @ionic/angular@8.3.4-dev.11729879684.1ea28919
Repeat steps 4-7
Verify that the error message doesn't occur

ionic-team / ionic-framework