<iframe 
  {% if site.postbar %}
  width="540" height="315"
  {% else %}
  width="853" height="480"
  {% endif %}
  src="//www.youtube.com/embed/{{ include.video }}?rel=0&amp;controls={{ site.youtube_controls }}&amp;showinfo={{ site.youtube_controls }}" 
  frameborder="0" allowfullscreen>
</iframe>