Co-authored-by: XhmikosR <xhmikosr@gmail.com>

* clear timeout before showing the toast

* Add unit test

* Remove the check for timeout

* Check for clearTimeout to have been called

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

* Rename `sr-only`/`sr-only-focusable`

To be more representative of the fact that these are not necessarily "screen reader" specific, but actually apply to assistive technologies in general (and also things like Alexa/Siri/etc). Goes hand-in-hand with #31133

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

It's Chromium-based so it seems redundant.

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

Co-authored-by: XhmikosR <xhmikosr@gmail.com>
Co-authored-by: Mark Otto <markd.otto@gmail.com>

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

- Closes #28423

- Always use dashes for bullets
- Add some basic alt text for our readme OC sponsors

Missed those in 967e6071

This reverts commit b8abded0.

Use the recommended karma-browserstack-launcher settings

* Remove unneeded rule suppression
* Format tests/unit/.eslintrc.json
* build/.eslintrc.json: add strict for consistency

It's supported by all of our supported browsers.

Add aria-role presentation on li element when ul element has role tablist and remove dropdown from visual tests as they've been removed from doc