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Migration update (#31278)

* Clarify screen reader changes

* Add some docs and reboot notes to migration guide

* Add mention of docs renaming of screen reader helper page

* Mention null vars from navs PR at #31035

* Update migration.md

Co-authored-by: Patrick H. Lauke <redux@splintered.co.uk>
Co-authored-by: XhmikosR <xhmikosr@gmail.com>
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Mark Otto 2020-07-13 11:40:27 -07:00 committed by GitHub
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@ -11,8 +11,20 @@ toc: true
### Sass
- Renamed `.sr-only` and `.sr-only-focusable` to `.visually-hidden` and `.visually-hidden-focusable`.
- Renamed `sr-only()` and `sr-only-focusable()` mixins to `visually-hidden()` and `visually-hidden-focusable()`.
- "Screen reader" classes are now "visually hidden" classes.
- Changed the Sass file from `scss/helpers/_screenreaders.scss` to `scss/helpers/_visually-hidden.scss`
- Renamed `.sr-only` and `.sr-only-focusable` to `.visually-hidden` and `.visually-hidden-focusable`
- Renamed `sr-only()` and `sr-only-focusable()` mixins to `visually-hidden()` and `visually-hidden-focusable()`.
### Docs
- Renamed "Screen readers" helper page to "Visually hidden", and filename to `visually-hidden`
- Renamed "Checks" page to "Checks & radios", and filename to `checks-radios`
- Improved documentation of check/radio powered button groups
### Reboot
- Updated `th` styling to use a default `null` value for `font-weight` and inherit `text-align` instead of setting explicitly.
### Colors
@ -27,6 +39,10 @@ toc: true
- Disabled states of buttons are easier to customize thanks to additional arguments in the `button-variant()` mixin. [See #30639.](https://github.com/twbs/bootstrap/pull/30639)
#### Navs
- Added new `null` variables for `font-size`, `font-weight`, `color`, and `:hover` `color` to the `.nav-link` class.
#### Popovers
- Renamed `whiteList` option to `allowList`