Merge pull request twbs#23684 from andresgalante/breadcrumbs-a11y

Adds accessibility notes to breadcrumbs

docs/4.0/components/breadcrumb.md

@@ -4,31 +4,36 @@ title: Breadcrumb
 description: Indicate the current page's location within a navigational hierarchy that automatically adds separators via CSS.
 group: components
 ---
+## Overview
 
 Separators are automatically added in CSS through [`::before`](https://developer.mozilla.org/en-US/docs/Web/CSS/::before) and [`content`](https://developer.mozilla.org/en-US/docs/Web/CSS/content).
 
 {% example html %}
-<ol class="breadcrumb">
-  <li class="breadcrumb-item active">Home</li>
-</ol>
-<ol class="breadcrumb">
-  <li class="breadcrumb-item"><a href="#">Home</a></li>
-  <li class="breadcrumb-item active">Library</li>
-</ol>
-<ol class="breadcrumb">
-  <li class="breadcrumb-item"><a href="#">Home</a></li>
-  <li class="breadcrumb-item"><a href="#">Library</a></li>
-  <li class="breadcrumb-item active">Data</li>
-</ol>
-{% endexample %}
 
-Similar to our navigation components, breadcrumbs work fine with or without the usage of list markup.
+<nav aria-label="breadcrumb" role="navigation">
+  <ol class="breadcrumb">
+    <li class="breadcrumb-item active" aria-current="page">Home</li>
+  </ol>
+</nav>
 
-{% example html %}
-<nav class="breadcrumb">
-  <a class="breadcrumb-item" href="#">Home</a>
-  <a class="breadcrumb-item" href="#">Library</a>
-  <a class="breadcrumb-item" href="#">Data</a>
-  <span class="breadcrumb-item active">Bootstrap</span>
+<nav aria-label="breadcrumb" role="navigation">
+  <ol class="breadcrumb">
+    <li class="breadcrumb-item"><a href="#">Home</a></li>
+    <li class="breadcrumb-item active" aria-current="page">Library</li>
+  </ol>
+</nav>
+
+<nav aria-label="breadcrumb" role="navigation">
+  <ol class="breadcrumb">
+    <li class="breadcrumb-item"><a href="#">Home</a></li>
+    <li class="breadcrumb-item"><a href="#">Library</a></li>
+    <li class="breadcrumb-item active" aria-current="page">Data</li>
+  </ol>
 </nav>
 {% endexample %}
+
+## Accessibility
+
+Since breadcrumbs provide a navigation, it's a good idea to add a meaningful label such as `aria-label="breadcrumb"` to describe the type of navigation provided in the `<nav>` element, as well as applying an `aria-current="page"` to the last item of the set to indicate that it represents the current page.
+
+For more information, see the [WAI-ARIA Authoring Practices for the breadcrumb pattern](https://www.w3.org/TR/wai-aria-practices/#breadcrumb).