Add rel="noopener" for external links.

docs/3.3/index.html

@@ -104,16 +104,16 @@
       <hr class=half-rule>
       <div class="row bs-docs-featured-sites">
         <div class="col-xs-6 col-sm-3">
-          <a href=https://expo.getbootstrap.com/2014/10/29/lyft/ target=_blank title=Lyft> <img alt=Lyft src=assets/img/expo-lyft.jpg class=img-responsive> </a>
+          <a href=https://expo.getbootstrap.com/2014/10/29/lyft/ rel=noopener target=_blank title=Lyft> <img alt=Lyft src=assets/img/expo-lyft.jpg class=img-responsive> </a>
         </div>
         <div class="col-xs-6 col-sm-3">
-          <a href=https://expo.getbootstrap.com/2014/09/30/vogue/ target=_blank title=Vogue> <img alt=Vogue src=assets/img/expo-vogue.jpg class=img-responsive> </a>
+          <a href=https://expo.getbootstrap.com/2014/09/30/vogue/ rel=noopener target=_blank title=Vogue> <img alt=Vogue src=assets/img/expo-vogue.jpg class=img-responsive> </a>
         </div>
         <div class="col-xs-6 col-sm-3">
-          <a href=https://expo.getbootstrap.com/2014/03/13/riot-design/ target=_blank title="Riot Design"> <img alt="Riot Design" src=assets/img/expo-riot.jpg class=img-responsive> </a>
+          <a href=https://expo.getbootstrap.com/2014/03/13/riot-design/ rel=noopener target=_blank title="Riot Design"> <img alt="Riot Design" src=assets/img/expo-riot.jpg class=img-responsive> </a>
         </div>
         <div class="col-xs-6 col-sm-3">
-          <a href=https://expo.getbootstrap.com/2014/02/12/newsweek/ target=_blank title=Newsweek> <img alt=Newsweek src=assets/img/expo-newsweek.jpg class=img-responsive> </a>
+          <a href=https://expo.getbootstrap.com/2014/02/12/newsweek/ rel=noopener target=_blank title=Newsweek> <img alt=Newsweek src=assets/img/expo-newsweek.jpg class=img-responsive> </a>
         </div>
       </div>
       <hr class=half-rule>
@@ -128,8 +128,8 @@
         <li><a href=about/ >About</a>
         </li>
       </ul>
-      <p>Designed and built with all the love in the world by <a href=https://twitter.com/mdo target=_blank>@mdo</a> and <a href=https://twitter.com/fat target=_blank>@fat</a>. Maintained by the <a href=https://github.com/orgs/twbs/people>core team</a> with the help of <a href=https://github.com/twbs/bootstrap/graphs/contributors>our contributors</a>.</p>
-      <p>Code licensed <a href=https://github.com/twbs/bootstrap/blob/master/LICENSE target=_blank rel=license>MIT</a>, docs <a href=https://creativecommons.org/licenses/by/3.0/ target=_blank rel=license>CC BY 3.0</a>.</p>
+      <p>Designed and built with all the love in the world by <a href=https://twitter.com/mdo rel=noopener target=_blank>@mdo</a> and <a href=https://twitter.com/fat rel=noopener target=_blank>@fat</a>. Maintained by the <a href=https://github.com/orgs/twbs/people>core team</a> with the help of <a href=https://github.com/twbs/bootstrap/graphs/contributors>our contributors</a>.</p>
+      <p>Code licensed <a href=https://github.com/twbs/bootstrap/blob/master/LICENSE target=_blank rel="license noopener">MIT</a>, docs <a href=https://creativecommons.org/licenses/by/3.0/ target=_blank rel="license noopener">CC BY 3.0</a>.</p>
     </div>
   </footer>
   <script src=https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js></script>