Fixes #11660: Depcreate small and .small in blockquote in favor of footer

css.html

@@ -857,17 +857,17 @@ base_url: "../"
     <p>Style and content changes for simple variations on a standard <code>&lt;blockquote&gt;</code>.</p>
 
     <h4>Naming a source</h4>
-    <p>Add <code>&lt;small&gt;</code> tag or <code>.small</code> class for identifying the source. Wrap the name of the source work in <code>&lt;cite&gt;</code>.</p>
+    <p>Add a <code>&lt;footer&gt;</code> for identifying the source. Wrap the name of the source work in <code>&lt;cite&gt;</code>.</p>
     <div class="bs-example">
       <blockquote>
         <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p>
-        <small>Someone famous in <cite title="Source Title">Source Title</cite></small>
+        <footer>Someone famous in <cite title="Source Title">Source Title</cite></footer>
       </blockquote>
     </div>
 {% highlight html %}
 <blockquote>
   <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p>
-  <small>Someone famous in <cite title="Source Title">Source Title</cite></small>
+  <footer>Someone famous in <cite title="Source Title">Source Title</cite></footer>
 </blockquote>
 {% endhighlight %}
 
@@ -876,7 +876,7 @@ base_url: "../"
     <div class="bs-example" style="overflow: hidden;">
       <blockquote class="pull-right">
         <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p>
-        <small>Someone famous in <cite title="Source Title">Source Title</cite></small>
+        <footer>Someone famous in <cite title="Source Title">Source Title</cite></footer>
       </blockquote>
     </div>
 {% highlight html %}

dist/css/bootstrap.css

@@ -606,12 +606,14 @@ blockquote p {
 blockquote p:last-child {
   margin-bottom: 0;
 }
+blockquote footer,
 blockquote small,
 blockquote .small {
   display: block;
   line-height: 1.428571429;
   color: #999;
 }
+blockquote footer:before,
 blockquote small:before,
 blockquote .small:before {
   content: '\2014 \00A0';

less/type.less

@@ -270,6 +270,10 @@ blockquote {
   p:last-child {
     margin-bottom: 0;
   }
+
+  // Deprecating small and .small for v3.1
+  // Context: https://github.com/twbs/bootstrap/issues/11660
+  footer,
   small,
   .small {
     display: block;