Factor out the anchor prefix to easily allow switching to #!

client/web/typedef.html

 <link rel="import" href="annotations.html">
 <link rel="import" href="comment.html">
 <link rel="import" href="parameters.html">
 
 <polymer-element name="dartdoc-typedef" attributes="item">
   <template>
     <div class="page-header"><h1>{{item.name}} typedef</h1></div>
 
     <!-- Signature -->
     <div class="panel-heading">
       <dartdoc-annotation annotations="{{item.annotations}}">
       </dartdoc-annotation>
 
       <p class="panel-title">typedef
-        <a href="#{{item.type.location}}">{{item.type.simpleType}}</a>
+        <a href="{{prefixedLocation}}">{{item.type.simpleType}}</a>
         {{item.name}}
         <dartdoc-parameter parameters="{{item.parameters}}"></dartdoc-parameter>
       </p>
     </div>
 
     <!-- Comment -->
     <div is="dartdoc-comment" item="{{item}}"></div>
   </template>
 
   <script type="application/dart" src="typedef.dart"></script>
 </polymer-element>