title: How to add a class name to a specific selector
body: <p>Considering the following html:</p>
  
  <pre><code>&lt;div class="box"&gt;
      &lt;ul class="tabs"&gt;
          &lt;li&gt;&lt;a href="publication#all"&gt;ALL&lt;/a&gt;&lt;/li&gt;
          &lt;li&gt;&lt;a href="publication#country"&gt;COUNTRY&lt;/a&gt;&lt;/li&gt;
          &lt;li&gt;&lt;a href="publication#date"&gt;DATE&lt;/a&gt;&lt;/li&gt;
      &lt;/ul&gt;
  
      &lt;div id="tab_all"&gt;...&lt;/div&gt;
  
      &lt;div id="tab_country"&gt;...&lt;/div&gt;
      &lt;div id="tab_date"&gt;...&lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>From a specific element, i want to add a class to the anchor <strong>a</strong> with an href of "publication#country"</p>
  
  <p>This is what i've done so far with no success.</p>
  
  <pre><code>$("#tab_date").siblings("ul.tabs").find('li a[href=publication#country').addClass("current");
  </code></pre>