{% if article is defined %}

  <meta property="og:type" content="article" />
  <meta property="og:url" content="{{ SITEURL }}/{{ article.url }}" />
  <meta property="og:title" content="{{ article.title | replace("\"", "&quot;") }}" />
  <meta property="og:description" content="{{ article.content | striptags | replace("\"", "&quot;") | truncate(196, False, '...') }}" />
  <meta property="twitter:title" content="{{ article.title | replace("\"", "&quot;") }}" />
  <meta property="twitter:card" content="summary" />
  <meta property="twitter:description" content="{{ article.content | striptags | replace("\"", "&quot;") | truncate(196, False, '...') }}" />

{% elif page is defined %}

  <meta property="og:type" content="website" />
  <meta property="og:url" content="{{ SITEURL }}/{{ page.url }}" />
  <meta property="og:title" content="{{ SITENAME }} - {{ page.title | replace("\"", "&quot;") }}" />
  <meta property="og:description" content="{{ page.content | striptags | replace("\"", "&quot;") | truncate(196, False, '...') }}" />
  <meta property="twitter:title" content="{{ SITENAME }} - {{ page.title | replace("\"", "&quot;") }}" />
  <meta property="twitter:card" content="summary" />
  <meta property="twitter:description" content="{{ page.content | striptags | replace("\"", "&quot;") | truncate(196, False, '...') }}" />

{% else %}

  <meta property="og:type" content="website" />
  <meta property="og:url" content="{{ SITEURL }}/{{ output_file }}" />
  <meta property="og:title" content="{{ SITENAME }}" />
  <meta property="og:description" content="A page on Attention Span History" />
  <meta property="twitter:title" content="{{ SITENAME }}" />
  <meta property="twitter:card" content="summary" />
  <meta property="twitter:description" content="A page on Attention Span History" />

{% endif %}

<meta property="og:image" content="{{ SITEURL }}/images/trent.jpg" />