<!– title tag –> {% if page.title %}

{% assign seo_title = page.title | append: " - " | append: site.title %}

{% endif %}

{% if seo_title %}

{% assign seo_title = seo_title | markdownify | strip_html | strip_newlines | escape_once %}

{% endif %}

<title>{{ seo_title | default: site.title }}{% if paginator %}{% unless paginator.page == 1 %} - {{ site.data.ui-text.page | default: “Page” }} {{ paginator.page }}{% endunless %}{% endif %}</title>

<!– description tag –> {% assign seo_description = page.description | default: page.excerpt | default: site.description %} {% if seo_description %}

{% assign seo_description = seo_description | markdownify | strip_html | strip_newlines | escape_once %}

{% endif %}

<meta name=“description” content=“{{ seo_description }}”>

<!– author tag –> {% assign seo_author = page.author | default: page.author | default: site.author.name %} {% if seo_author %}

{% if seo_author.twitter %}
  {% assign seo_author_twitter = seo_author.twitter %}
{% else %}
  {% if site.data.authors and site.data.authors[seo_author] %}
    {% assign seo_author_twitter = site.data.authors[seo_author].twitter  %}
  {% else %}
    {% assign seo_author_twitter = seo_author  %}
  {% endif %}
{% endif %}
{% assign seo_author_twitter = seo_author_twitter | replace: "@", "" %}

{% endif %}

<meta name=“author” content=“{{ seo_author }}”>

<!– Open Graph properties –> <meta property=“og:locale” content=“{{ site.locale | replace: ”-“, ”_“ | default: ”en_US“ }}”> <meta property=“og:site_name” content=“{{ site.title }}”> <meta property=“og:title” content=“{{ seo_title }}”>

<!– canonical and og:url –> {% if site.url %}

{% assign seo_url = site.url | append: site.baseurl %}

{% endif %} {% assign seo_url = seo_url | default: site.github.url %}

{% if seo_url %}

<link rel="canonical" href="{{ page.url | prepend: seo_url | replace: "/index.html", "/" }}">
<meta property="og:url" content="{{ page.url | prepend: seo_url | replace: "/index.html", "/" }}">

{% endif %}

{% if page.excerpt %}

<meta property="og:description" content="{{ seo_description }}">

{% endif %}

{% assign page_image = (page.image | default: site.og_image) | absolute_url %} {% assign site_og_image = site.og_image | absolute_url %}

{% if site.twitter.username %}

<meta name="twitter:site" content="@{{ site.twitter.username | replace: "@", "" }}">
<meta name="twitter:title" content="{{ page.title | default: site.title | markdownify | strip_html | strip_newlines | escape_once }}">
<meta name="twitter:description" content="{{ seo_description }}">

{% if site.url %}
  {% assign canonical_url = page.url | replace: "index.html", "" | prepend: site.url %}
{% endif %}

<meta name="twitter:url" content="{{ canonical_url }}">

{% if page_image %}
  <meta name="twitter:card" content="summary">
  {% if page_teaser_image %}
    <meta name="twitter:image" content="{{ page_image }}">
  {% endif %}
{% endif %}

{% if seo_author_twitter %}
  <meta name="twitter:creator" content="@{{ seo_author_twitter }}">
{% endif %}

{% endif %}

{% if site.facebook %}

{% if site.facebook.publisher %}
  <meta property="article:publisher" content="{{ site.facebook.publisher }}">
{% endif %}

{% if site.facebook.app_id %}
  <meta property="fb:app_id" content="{{ site.facebook.app_id }}">
{% endif %}

{% endif %}

{% if page_image %}

<meta property="og:image" content="{{ page_image }}">

{% endif %}

{% if page.date %}

<meta property="og:type" content="article">
<meta property="article:published_time" content="{{ page.date | date_to_xmlschema }}">

{% endif %}

{% if paginator.previous_page %}

<link rel="prev" href="{{ paginator.previous_page_path | prepend: seo_url }}">

{% endif %} {% if paginator.next_page %}

<link rel="next" href="{{ paginator.next_page_path | prepend: seo_url }}">

{% endif %}

{% if site.og_image %}

<script type="application/ld+json">
  {
    "@context": "http://schema.org",
    "@type": "Organization",
    "url": {{ seo_url | jsonify }},
    "logo": {{ site_og_image | jsonify }}
  }
</script>

{% endif %}

{% if site.social %}

<script type="application/ld+json">
  {
    "@context" : "http://schema.org",
    "@type" : "{% if site.social.type %}{{ site.social.type }}{% else %}Person{% endif %}",
    "name" : "{{ site.social.name | default: site.name }}",
    "url" : {{ seo_url | jsonify }},
    "sameAs" : {{ site.social.links | jsonify }}
  }
</script>

{% endif %}

{% if site.google_site_verification %}

<meta name="google-site-verification" content="{{ site.google_site_verification }}" />

{% endif %} {% if site.bing_site_verification %}

<meta name="msvalidate.01" content="{{ site.bing_site_verification }}">

{% endif %} {% if site.alexa_site_verification %}

<meta name="alexaVerifyID" content="{{ site.alexa_site_verification }}">

{% endif %} {% if site.yandex_site_verification %}

<meta name="yandex-verification" content="{{ site.yandex_site_verification }}">

{% endif %} {% if site.naver-site-verification %}

<meta name="naver-site-verification" content="{{ site.naver-site-verification }}">

{% endif %}