Fixed #21221 -- Made form Media and static template tag use staticfiles if installed.

docs/topics/forms/media.txt

@@ -203,12 +203,13 @@ Paths in asset definitions
 Paths used to specify assets can be either relative or absolute. If a
 path starts with ``/``, ``http://`` or ``https://``, it will be
 interpreted as an absolute path, and left as-is. All other paths will
-be prepended with the value of the appropriate prefix.
+be prepended with the value of the appropriate prefix. If the
+:mod:`django.contrib.staticfiles` app is installed, it will be used to serve
+assets.
 
-As part of the introduction of the
-:doc:`staticfiles app </ref/contrib/staticfiles>` two new settings were added
-to refer to "static files" (images, CSS, JavaScript, etc.) that are needed
-to render a complete web page: :setting:`STATIC_URL` and :setting:`STATIC_ROOT`.
+Whether or not you use :mod:`django.contrib.staticfiles`,  the
+:setting:`STATIC_URL` and :setting:`STATIC_ROOT` settings are required to
+render a complete web page.
 
 To find the appropriate prefix to use, Django will check if the
 :setting:`STATIC_URL` setting is not ``None`` and automatically fall back
@@ -238,6 +239,18 @@ But if :setting:`STATIC_URL` is ``'http://static.example.com/'``::
     <script type="text/javascript" src="http://static.example.com/animations.js"></script>
     <script type="text/javascript" src="http://othersite.com/actions.js"></script>
 
+Or if :mod:`~django.contrib.staticfiles` is configured using the
+`~django.contib.staticfiles.ManifestStaticFilesStorage`::
+
+    >>> w = CalendarWidget()
+    >>> print(w.media)
+    <link href="/css/pretty.css" type="text/css" media="all" rel="stylesheet" />
+    <script type="text/javascript" src="https://static.example.com/animations.27e20196a850.js"></script>
+    <script type="text/javascript" src="http://othersite.com/actions.js"></script>
+
+.. versionchanged:: 1.10
+
+    Older versions didn't serve assets using :mod:`django.contrib.staticfiles`.
 
 ``Media`` objects
 -----------------