{#- Theme Switcher Button to toggle between dark/light #}
  {%- set integrity = (config.extra.integrity if config.extra.integrity is defined else true) -%}
  {%- if config.extra.search_library %}{%- if config.extra.search_library == "offline" %}{% set integrity = false %}{% endif %}{% endif %}

  {%- if (config.extra.js_switcher if config.extra.js_switcher is defined else true) %}
  {%- set js_theme="js/theme.min.js" %}
  {%- if config.extra.js_switcher_default %}
    {%- if config.extra.js_switcher_default == "light" %}{% set js_theme="js/theme_light.min.js" %}{% endif %}
  {%- endif %}
  <script src="{{                     get_url(path=js_theme                        , trailing_slash=false) | safe }}"{%- if integrity %} integrity="sha384-{{ get_hash(path=js_theme, sha_type=384, base64=true) | safe }}"{%- endif %}></script>
  {%- endif %}





{#- Style Sheets #}
  {%- set stylesheets=(config.extra.stylesheets if config.extra.stylesheets is defined else [ "abridge.css" ]) -%}
  {%- if stylesheets %}{%- for i in stylesheets %}
  <link rel="stylesheet" href="{{     get_url(path=i                               , trailing_slash=false, cachebust=true) | safe }}" />
  {%- endfor %}{%- endif %}

  {%- if page?.extra?.stylesheets %}{%- set pagestylesheets=page?.extra?.stylesheets -%}{%- endif %}
  {%- if pagestylesheets %}{%- for i in pagestylesheets %}
  <link rel="stylesheet" href="{{     get_url(path=i                               , trailing_slash=false, cachebust=true) | safe }}" />
  {%- endfor %}{%- endif %}





{#- meta tags #}
  <meta charset="utf-8" />
  <meta http-equiv="x-ua-compatible" content="ie=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <meta name="base" content="{{ config.base_url | safe }}" />
  <meta name="HandheldFriendly" content="True" />
  <meta name="mobile-web-app-capable" content="yes" />
  <meta name="apple-mobile-web-app-capable" content="yes" />
  <meta name="apple-mobile-web-app-status-bar-style" content="default" />





{#- Security: CSP, referrer #}
  {%- if config.extra.security_header_referrer %}
  <meta name="referrer" content="{{ config.extra.security_header_referrer | safe }}" />
  {%- endif %}
  {%- if config.extra.security_header_csp %}
  <meta http-equiv="Content-Security-Policy" content="{{ config.extra.security_header_csp | safe }}" />
  {%- endif %}





{#- Favicons #}
  {%- if config.extra.favicon_theme_color %}
  <meta name="theme-color" content="{{ config.extra.favicon_theme_color }}" />
  {%- endif %}

  {%- if config.extra.favicon_ms_color %}
  <meta name="msapplication-TileColor" content="{{ config.extra.favicon_ms_color }}" />
  {%- endif %}

  {%- if config.extra.webmanifest %}
  <link rel="manifest" href="{{ get_url(path=config.extra.webmanifest, trailing_slash=false) | safe }}" />
  {%- endif %}

  {%- if config.extra.favicon_mask and config.extra.favicon_mask_color %}
  <link rel="mask-icon" href="{{ get_url(path=config.extra.favicon_mask, trailing_slash=false) | safe }}" color="{{ config.extra.favicon_mask_color }}" />
  {%- endif %}

  {%- if config.extra.favicon_svg %}
  <link rel="icon" type="image/svg+xml" href="{{ get_url(path=config.extra.favicon_svg, trailing_slash=false) | safe }}" />
  {%- endif %}

  {%- if config.extra.favicon180 %}
  <link rel="apple-touch-icon" sizes="180x180" href="{{ get_url(path=config.extra.favicon180, trailing_slash=false) | safe }}" />
  {%- endif %}

  {%- if config.extra.favicon32 %}
  <link rel="icon" type="image/png" sizes="32x32" href="{{ get_url(path=config.extra.favicon32, trailing_slash=false) | safe }}" />
  {%- endif %}

  {%- if config.extra.favicon16 %}
  <link rel="icon" type="image/png" sizes="16x16" href="{{ get_url(path=config.extra.favicon16, trailing_slash=false) | safe }}" />
  {%- endif %}





{#- Style Sheets Preload #}
  {%- set integrity = (config.extra.integrity if config.extra.integrity is defined else true) -%}
  {%- if config.extra.search_library %}{%- if config.extra.search_library == "offline" %}{% set integrity = false %}{% endif %}{% endif %}

{%- if config.extra.fonts %}{%- for i in config.extra.fonts %}
  {%- if i.url is matching(pat="^http[s]?://") %}
  <link rel="preload" as="style" class="preStyle" href="{{ i.url | safe }}" crossorigin="anonymous" />
  {%- else %}
  <link rel="preload" as="font" href="{{ get_url(path=i.url, trailing_slash=false) | safe }}" type="font/woff2" />
  {%- endif %}
{%- endfor %}{%- endif %}

{%- if config.extra.fontawesome %}
  <link rel="preload" as="style" class="preStyle" href="{{ config.extra.fontawesome | safe }}" crossorigin="anonymous" />
{%- endif %}

{%- if config.extra.math or page?.extra?.math %}

  {%- set katex_css=(config.extra.katex_css if config.extra.katex_css else "katex.min.css") -%}
  {%- if katex_css %}{%- if katex_css is matching(pat="^http[s]?://") %}
  <link rel="preload" as="style" class="preStyle" href="{{ katex_css | safe }}"{%- if integrity and config.extra.katex_css_integrity %} integrity="{{ config.extra.katex_css_integrity | safe }}"{%- endif %} crossorigin="anonymous" />
  {%- else %}
  <link rel="preload" as="style" class="preStyle" href="{{ get_url(path=katex_css, trailing_slash=false) }}"{%- if integrity %} integrity="sha384-{{ get_hash(path=katex_css, sha_type=384, base64=true) | safe }}"{%- endif %} />
  {%- endif %}{%- endif %}

{%- endif %}





{#- Rss / Atom Feed -#}
{%- if config.generate_feeds -%}
{%- for feed in config.feed_filenames -%}
{%- if feed is containing(pat='atom') %}
  <link rel="alternate" type="application/atom+xml" title="{{ config.title }} Atom Feed" href="{{ get_url(path=feed, trailing_slash=false, lang=lang) | safe }}" />
{%- endif -%}
{%- if feed is containing(pat='rss') %}
  <link rel="alternate" type="application/rss+xml" title="{{ config.title }} RSS Feed" href="{{ get_url(path=feed, trailing_slash=false, lang=lang) | safe }}" />
{%- endif -%}
{%- endfor -%}
{%- endif -%}
{#- Extra items -#}
{%- if config.extra.head_extra %}
  {{ config.extra.head_extra | safe }}
{%- endif -%}
{#- End of head partial -#}