title: Can fetch() do responseType=document?
body: <p>XHR's <code>responseType='document'</code> is awesome because it hands you back a DOM document that you can use querySelector, etc on:</p>
  
  <pre class="lang-js prettyprint-override"><code>var xhr = new XMLHttpRequest();
  xhr.open('GET', '/', true);
  xhr.responseType = 'document';
  xhr.onload = function(e) {
    var document = e.target.response;
    var h2headings = document.querySelectorAll('h2');
    // ...
  };
  </code></pre>
  
  <p>Is this possible with the <code>fetch</code> method?</p>