This change follows exactly what was done for the `$grays`, `$colors`, and `$theme-colors` lists in #23260. This allows for easy addition of new breakpoints or grid containers also.
Blockquote footer font size is currently hardcoded to 80%, implying (in a comment) that this would result in the default font size. However, since the blockquote font size itself is variable, this is not necessarily true, and 80% of anything actually results in an arbitrary font size.
80% as a default is still fine.
* add 'lighter' and 'bolder' font weight classes
these are 2 special values for font weight, that will give their content a font-weight value of 100 more or less than their inherited font-weight.
probably doesn't fully fulfill this issue, https://github.com/twbs/bootstrap/issues/23969, but it's a start
* Update .stylelintrc
* add 'lighter' and 'bolder' variables per @mdo 's request.
* Fix focus box shadow of custom ranges
* Put `:focus` selector right after `.custom-range`
* Remove unnecessary `outline: none`
* Fix box-shadow issues in IE/Edge
* Better align
* Fix thumb vertical positions in IE/Edge
* Fix incorrect formula of thumb vertical positions in Webkit
* Fix an incorrect comment
* Fix incorrect box-shadow-width
- Only applies to textual inputs and textareas with `.form-control` and selects with `.custom-select`
- Wrap the feedback icons in a Sass variable option, $enable-validation-icons, so folks who theme can disable
- Update docs to summarize styles, mention the icons, include a textarea demo, and add mention of the Sass variable option to the Theming section
- Fixes#25656 where custom selects had the wrong focus shadow
- Fixes#26668 where custom selects had no inset shadow (also closes#26572 which had the wrong form classes on the first example anyway)
* added the styling
* added the documentation
* update for one rule per line
* fix hound error: trailing whitespace
* trimmed off vendor prefixes
* Add note about track and thumb
* Psuedo-elements must be split across multiple rulesets to have an affect
* Fix firefox inner focus
* Seems that FF is the only one affected by this
* Add support for gradients
* Add labels, clarify min/max changes
* add step example
* add custom range vars
