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Add Sass variable for prefers-reduced-motion, add callout to affected components (#27581)

* Tweak the accessibility/reduced motion text

include mention of carousel slides, remove the (now inaccurate, as Firefox 63 includes it too) mention that support is limited to Safari/macOS

xref https://github.com/twbs/bootstrap/issues/27525

* Add new callout for reduced motion

* Add variable to control prefers-reduced-motion media query support

* Add callout about prefers-reduced-motion to all components currently using animation which are affected
This commit is contained in:
Patrick H. Lauke
2018-11-03 19:23:26 +01:00
committed by GitHub
parent f7a4b39767
commit 8b20bce873
11 changed files with 32 additions and 12 deletions
@@ -45,7 +45,7 @@ For visually hidden interactive controls, such as traditional "skip" links, `.sr
### Reduced motion
Bootstrap includes support for the [`prefers-reduced-motion` media feature](https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-motion). In browsers/environments that allow the user to specify their preference for reduced motion, most CSS transition effects in Bootstrap (for instance, when a modal dialog is opened or closed) will be disabled. Currently, support is limited to Safari on macOS and iOS.
Bootstrap includes support for the [`prefers-reduced-motion` media feature](https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-motion). In browsers/environments that allow the user to specify their preference for reduced motion, most CSS transition effects in Bootstrap (for instance, when a modal dialog is opened or closed, or the sliding animation in carousels) will be disabled.
## Additional resources
+1
View File
@@ -237,6 +237,7 @@ You can find and customize these variables for key global options in Bootstrap's
| `$enable-shadows` | `true` or `false` (default) | Enables predefined `box-shadow` styles on various components. |
| `$enable-gradients` | `true` or `false` (default) | Enables predefined gradients via `background-image` styles on various components. |
| `$enable-transitions` | `true` (default) or `false` | Enables predefined `transition`s on various components. |
| `$enable-prefers-reduced-motion-media-query` | `true` (default) or `false` | Enables the [`prefers-reduced-motion` media query]({{ site.baseurl }}/docs/{{ site.docs_version }}/getting-started/accessibility/#reduced-motion), which suppresses certain animations/transitions based on the users' browser/operating system preferences. |
| `$enable-hover-media-query` | `true` or `false` (default) | **Deprecated** |
| `$enable-grid-classes` | `true` (default) or `false` | Enables the generation of CSS classes for the grid system (e.g., `.container`, `.row`, `.col-md-1`, etc.). |
| `$enable-caret` | `true` (default) or `false` | Enables pseudo element caret on `.dropdown-toggle`. |