ed.xml" | relative_url | prepend: site.url }}">

<!-- Twitter cards -->
{% if site.twitter_username %}
<meta name="twitter:site"    content="@{{ site.twitter_username }}">
<meta name="twitter:creator" content="@{{ site.twitter_username }}">
<meta name="twitter:title"   content="{{ page.title }}">
{% endif %}

{% if page.summary %}
<meta name="twitter:description" content="{{ page.summary }}">
{% else %}
<meta name="twitter:description" content="{{ site.description }}">
{% endif %}

{% if page