Add link to diff.html

test/index.html

@@ -25,6 +25,8 @@ Jump to:
 <a class="loading-opts" href="./cross-origin-broken.html">[cross origin broken]</a>
 &#160;|&#160;
 <a class="loading-opts" href="./cross-origin-good.html">[cross origin good]</a>
+&#160;|&#160;
+<a class="loading-opts" href="./diff.html">[diff]</a>
 <br/><br/>
 
 <div id="bar" style="margin-bottom: 6px;"></div>