title: HAML - how do I create this line of HTML
body: <p>This is kind of a complicated line of HTML to create in HAML:</p>
  
  <pre><code>&lt;a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse"&gt;
  </code></pre>
  
  <p>I am not sure how to do that.  Any idea? I am only able to do this:</p>
  
  <pre><code>%a.btn
    %span.icon-bar Hello
  </code></pre>
  
  <p>but not sure how to do the complex stuff. </p>
  
  <p>Thanks!</p>