Merge branch 'v4' of https://github.com/twbs/derpstrap into v4

1 files changed, 10 insertions, 9 deletions

diff --git a/docs/components/collapse.md b/docs/components/collapse.md
index 40c27009e..e61fb82b5 100644
--- a/docs/components/collapse.md
+++ b/docs/components/collapse.md
@@ -5,10 +5,11 @@ title: Collapse
 
 Flexible plugin that utilizes a handful of classes for easy toggle behavior.
 
-<div class="bs-callout bs-callout-danger">
-  <h4>Plugin dependency</h4>
-  <p>Collapse requires the <a href="#transitions">transitions plugin</a> to be included in your version of Bootstrap.</p>
-</div>
+{% callout danger %}
+#### Plugin dependency
+
+Collapse requires the [transitions plugin](#transitions) to be included in your version of Bootstrap.
+{% endcallout %}
 
 ## Example
 
@@ -87,11 +88,11 @@ Extend the default collapse behavior to create an accordion with the panel compo
 </div>
 {% endexample %}
 
-<div class="bs-callout bs-callout-warning">
-  <h4>Make expand/collapse controls accessible</h4>
-  <p>Be sure to add <code>aria-expanded</code> to the control element. This attribute explicitly defines the current state of the collapsible element to screen readers and similar assistive technologies. If the collapsible element is closed by default, it should have a value of <code>aria-expanded="false"</code>. If you've set the collapsible element to be open by default using the <code>in</code> class, set <code>aria-expanded="true"</code> on the control instead. The plugin will automatically toggle this attribute based on whether or not the collapsible element has been opened or closed.</p>
-  <p>Additionally, if your control element is targetting a single collapsible element – i.e. the <code>data-target</code> attribute is pointing to an <code>id</code> selector – you may add an additional <code>aria-controls</code> attribute to the control element, containing the <code>id</code> of the collapsible element. Modern screen readers and similar assistive technologies make use of this attribute to provide users with additional shortcuts to navigate directly to the collapsible element itself.</p>
-</div>
+## Accessibility
+
+Be sure to add `aria-expanded` to the control element. This attribute explicitly defines the current state of the collapsible element to screen readers and similar assistive technologies. If the collapsible element is closed by default, it should have a value of `aria-expanded="false"`. If you've set the collapsible element to be open by default using the `in` class, set `aria-expanded="true"` on the control instead. The plugin will automatically toggle this attribute based on whether or not the collapsible element has been opened or closed.
+
+Additionally, if your control element is targetting a single collapsible element – i.e. the `data-target` attribute is pointing to an `id` selector – you may add an additional `aria-controls` attribute to the control element, containing the `id` of the collapsible element. Modern screen readers and similar assistive technologies make use of this attribute to provide users with additional shortcuts to navigate directly to the collapsible element itself.
 
 ## Usage