- Line height & font family from html were directly overridden by body, so they were redundant thus removed
- The remaining properties are moved to body
- Shim for IE10 tags removed
- hr cleanup
  - Combined styles from reboot & type
  - Changed from borders to background
    - This allows us to keep the color inherited.
    - Opacity can be used to change the intensity
    - Size attribute will not change the height instead of making the hr look like an input field
  - Better variable names
- headings cleanup
  - Moved all element styling to reboot
  - Type will now extend the element styling. This way we will save some redundant code
- small & mark are also moved to reboot. type does not contain any element styling anymore
- font weight removed from small, this did not really made sense

Removed leftover from #27789

Extrapolates the previously used selector into a new mixin that only generates valid CSS by creating psuedo-classes for `valid` and `invalid`, and nothing else.

Fixes #28380.

Currently, `$toast-border-radius` uses the value of `.25rem`. This is inconsistent with other variables such as `$btn-border-radius` and `$input-border-radius`, which uses the "global" `$border-radius` variable.

* Fix buttons :focus state styles

Buttons :hover and :focus state shares styles.
Buttons :focus text color on 'a.btn' is now consistent with others '.btn'.

* `:focus` styles should be in sync with `.focus`.

So shared styles with hover were copy to focus definition. Rather then using
`hover-focus` mixin which do not contain `.focus`.

Check prefers-reduced-motion variable before adding reduced motion media query for animated progress bars (#28530)

This reverts commit 9fda96e1.

- Deletes mixin mentions from float docs
- Deletes mixin mention from visibility docs
- Deletes the image-replacement page for text-hide

- Drop hover and focus states
- Drop .badge-* variants and associated mixin for .bg-* utilities
- Drop .badge-pill for .rounded-pill utliity and adjust horizontal padding to find middle ground of .badge and old .badge-pill
- Remove unused variables
- Add default color value to .badge base class
- Update docs to reflect changes

instead, only apply outline suppression if the browser wouldn't normally apply the focus outline, using the (currently experimental) `:focus-visible` pseudo-class

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

* Add map-name param to _assert-starts-at-zero

* Set default value for backwards compatibility

* Create border-top-left-radius mixin
* Create border-bottom-right-radius mixin