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>

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

Missed those in 967e6071

* 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

fix: ensure `totype` always returns stringified null/undefined when null/undefined is passed (#30383)

The `prev()` function doesn't take nodes other than elements into account. Also we could simplify things a lot using the `previousElementSibling` property. This property isn't fully supported in IE, it only works for elements, but since the `element` variable is an element, we can safely use it here.

I've also added an additional test.

I don't think we had this issue in v4, since we relied on jQuery back then.

Ref. https://developer.mozilla.org/en-US/docs/Web/API/NonDocumentTypeChildNode/nextElementSibling

"without instantiate it" should be "without instantiating it"

* Close modal with keyboard=true & backdrop=static