title: Why links in polymer library doesn't working until you add target="_self"
body: <p>My test site is a bit modified version of polymer starter kit (advanced version)</p>
  
  <p>And links won't work until you manually add <code>target="_self"</code> or another attribute even though: </p>
  
  <blockquote>
    <ul>
    <li>ripples effect happens when you click the button</li>
    <li>as well as link indication appears (the tiny link in the bottom edge of the browser when you hover the button)</li>
    </ul>
  </blockquote>
  
  <p>Sample code of the button</p>
  
  <pre><code>&lt;paper-button&gt;
      &lt;a href="{{baseUrl}}contact.html" target="_self"&gt;Contact&lt;/a&gt;
  &lt;/paper-button&gt;
  </code></pre>
  
  <p>I have <code>bower_components</code> directory in <code>app</code> folder of my project and it's full of all those elements by default, but do I need to <code>bower &lt;component name&gt; install</code> it before using or something like that or what else might causing the problem?</p>