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Rework progress bar markup and styles (#36831)

* Rework progress bar markup and styles

Logically moves the various `role` and `aria-` attributes to the `.progress` element itself, leaving the `.progress-bar` to be used purely for the visual presentation. This fixes the problem #36736 that in certain browser/AT combinations, zero-value/zero-width progress bars are completely ignored and not announced.

For multiple/stacked progress bars, this PR introduces a new wrapper and class `.progress-stacked`, to accommodate for the fact that with the more logical structure above, we need full `.progress` elements with child `.progress-bar` elements, and can't get away with the fudge we had before of having a single `.progress` with multiple `.progress-bar`s.

Note that the old markup structures still work with this change, so this could be considered a non-breaking change - though one we definitely want to highlight as it's more accessible (as it now guarantees that zero-value/zero-width progress bars, whether on their own or as part of a multi/stacked bar, are actually announced)

* Add a note about progress bar change in migration guide

* Add notes with old markup examples and explanation

* Fix bundlewatch

* Update site/content/docs/5.2/components/progress.md

Co-authored-by: Julien Déramond <julien.deramond@orange.com>

* Reintroduce deleted styles

Turns out they're needed for correct positioning of text inside progress bar

* Move changes in markup to Migrationg guide, link to that from top of progress page, rewrite some content

* Fix typo in callout

* Clarify "Sizing" section

* Remove redundant "now"

Co-authored-by: Julien Déramond <julien.deramond@orange.com>
Co-authored-by: Julien Déramond <juderamond@gmail.com>
Co-authored-by: Mark Otto <markdotto@gmail.com>
Co-authored-by: Mark Otto <markd.otto@gmail.com>
This commit is contained in:
Patrick H. Lauke
2022-11-29 07:07:48 +00:00
committed by GitHub
parent 019a977481
commit 26a3ef1bcb
6 changed files with 159 additions and 85 deletions
+42
View File
@@ -78,6 +78,48 @@ Learn more by reading the new [color modes documentation]({{< docsref "/customiz
- <span class="badge text-warning-emphasis bg-warning-subtle">Deprecated</span> The `.navbar-dark` class has been deprecated and replaced with `data-bs-theme="dark"` on the navbar or any parent element. [See the docs for updated examples.]({{< docsref "/components/navbar#color-schemes" >}})
### Progress bars
The markup for [progress bars]({{< docsref "/components/progress" >}}) has been updated in v5.3.0. Due to the placement of `role` and various `aria-` attributes on the inner `.progress-bar` element, **some screen readers were not announcing zero value progress bars**. Now, `role="progressbar"` and the relevant `aria-*` attributes are on the outer `.progress` element, leaving the `.progress-bar` purely for the visual presentation of the bar and optional label.
While we recommend adopting the new markup for improved compatibility with all screen readers, note that the legacy progress bar structure will continue to work as before.
```html
<!-- Previous markup -->
<div class="progress">
<div class="progress-bar" role="progressbar" aria-label="Basic example" style="width: 25%" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<!-- New markup -->
<div class="progress" role="progressbar" aria-label="Basic example" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100">
<div class="progress-bar" style="width: 25%"></div>
</div>
```
We've also introduced a new `.progress-stacked` class to more logically wrap [multiple progress bars]({{< docsref "/components/progress#multiple-bars" >}}) into a single stacked progress bar.
```html
<!-- Previous markup -->
<div class="progress">
<div class="progress-bar" role="progressbar" aria-label="Segment one" style="width: 15%" aria-valuenow="15" aria-valuemin="0" aria-valuemax="100"></div>
<div class="progress-bar bg-success" role="progressbar" aria-label="Segment two" style="width: 30%" aria-valuenow="30" aria-valuemin="0" aria-valuemax="100"></div>
<div class="progress-bar bg-info" role="progressbar" aria-label="Segment three" style="width: 20%" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<!-- New markup -->
<div class="progress-stacked">
<div class="progress" role="progressbar" aria-label="Segment one" aria-valuenow="15" aria-valuemin="0" aria-valuemax="100" style="width: 15%">
<div class="progress-bar"></div>
</div>
<div class="progress" role="progressbar" aria-label="Segment two" aria-valuenow="30" aria-valuemin="0" aria-valuemax="100" style="width: 30%">
<div class="progress-bar bg-success"></div>
</div>
<div class="progress" role="progressbar" aria-label="Segment three" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100" style="width: 20%">
<div class="progress-bar bg-info"></div>
</div>
</div>
```
### Forms
- `.form-control` is now styled with CSS variables to support color modes. This includes the addition of two new root CSS variables for the default and disabled form control backgrounds.