title: Closure library dom node from html text
body: <p>I have an html text like: </p>
  
  <p><code>'&lt;div class="a"&gt;&lt;span&gt;1&lt;/span&gt;&lt;div&gt;2&lt;/div&gt;&lt;/div&gt;'</code></p>
  
  <p>Is there a function in closure library to get such a string as input and return a DOM tree to insert in a document? </p>