<html>
<body>
<nav>
</nav>
<article>
<p>Some text</p>
</article>
</body>
</html>

<!DOCTYPE html>
<html>
  <body>
    <nav></nav>
    <article>
      <p>Some text</p>
    </article>
  </body>
</html>

Add doctype to valid doc fixture
Add doctype to valid doc fixture
