title: How to get entire HTML from HTMLFragment ( like innerHTML )
body: <p>If I have <code>fragment = document.createDocumentFragment()</code><br>
  with some random Dom inside and I want to get the entire HTML ( excaly like <code>innerHTML</code> in regular element or <code>document.documentElement.innerHTML</code> in <code>document</code> object.</p>
  
  <p>And after some text manipulation (by regex) return the HTML to the <code>fragment</code>
  how can I do that ? </p>