`aria-haspopup` use requires the use of an ARIA `menu`, `listbox`, `tree`, `grid` or `dialog` (see https://www.w3.org/TR/wai-aria-1.1/#aria-haspopup)

in our use (as generic disclosure widgets), it's incorrect and sets up the wrong assumption/behavior from assistive technologies.

in future, we likely want to change our dropdowns to essentially be like a `dialog` - move focus to it when opened, possibly make it modal so focus is maintained inside it and the rest of the page
is hidden/inert.

but for now, removing the incorrect attribute is probably the quickest, most immediate fix.

since the former is not contained in the `.github` subdirectory

Typo from 10b97f6e.

Remove warning if RFS is included more than once.

* Prep for v4.3.0

* More updates for v4.3.0.

* rerun to build docs source map

* Remove extra comma.

* Use curly braces in snippet.

Instead pass the class to the example include.

Similar to #28153

This reverts commit 6ea000d2.

Unfortunately, it doesn't seem to work.

It broke the example include.

This is more efficient than transitioning the `left` property.

Mostly be consistent with the attributes' order and improve compression when possible.

The previous was too light.