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

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

Nowadays, browser engines have improved a lot and `Math.floor` is the same, if not faster.
Also, clarity is better than micro-optimizations in this case.

This partially reverts commit 9c2b9ac7.

Also add v4.5.0 in versions and keep README.md pointing to v4.5.0 so that there are no broken stuff.

Missed those in 967e6071

This reverts commit 85c4788d.