Ejemplo de un head html con sintaxis JADE

head.jade

- var site_name = "Nombre del sitio."
- var titulo = "Titulo del sitio."
- var theme_color = "#color"
- var descripcion = "Descripcion de hasta 155 caracteres."

//- Facebook Vars
- var url_site = "http://www.example.com"

//- Twitter Vars 
- var username = "@username"
- var creator = "@username"

doctype html
html(lang="es" itemscope itemtype="http://schema.org/WebPage")
	head(prefix="og: http://ogp.me/ns# fb: http://ogp.me/ns/fb# website: http://ogp.me/ns/website#")
		//- A tener en cuenta antes de entregar un sitio:
		//- 	- Imagenes optimizadas
		//- 	- Google Analytics
		//- 	- Robots.txt
		//- 	- Sitemap.xml
		//- 	- www. en URL
		//- 	- Metadatos
		//- 	- Teléfonos clickeables desde el celular
		//- 	- Alt en Imágenes
    //- 	- Full Responsive
		
		meta(charset="utf-8")
		meta(http-equiv="X-UA-Compatible" content="IE=edge")
		meta(name="mobile-web-app-capable" content="yes")
		meta(name="apple-mobile-web-app-capable" content="yes")

		meta(name="theme-color" content="#{theme_color}")
		meta(name="msapplication-TileColor" content="#{theme_color}")
		meta(name="msapplication-navbutton-color" content="#{theme_color}")
			
		meta(name="apple-mobile-web-app-status-bar-style" content="black-translucent")
		meta(name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no")

		//- ======================== Favicons ========================
		//- Default Favicons
		link(rel="icon" type="image/png" sizes="16x16" href="#{url_site}/css/assets/favicons/favicon-16x16.png")
		link(rel="icon" type="image/png" sizes="24x24" href="#{url_site}/css/assets/favicons/favicon-24x24.png")
		link(rel="icon" type="image/png" sizes="32x32" href="#{url_site}/css/assets/favicons/favicon-32x32.png")
		link(rel="icon" type="image/png" sizes="64x64" href="#{url_site}/css/assets/favicons/favicon-64x64.png")
		link(rel="icon" type="image/png" sizes="96x96" href="#{url_site}/css/assets/favicons/favicon-96x96.png")
	
		//- Android Favicons
		link(rel="icon" type="image/png" sizes="32x32" href="#{url_site}/css/assets/favicons/android-chrome-32x32.png")
		link(rel="icon" type="image/png" sizes="48x48" href="#{url_site}/css/assets/favicons/android-chrome-48x48.png")
		link(rel="icon" type="image/png" sizes="72x72" href="#{url_site}/css/assets/favicons/android-chrome-72x72.png")
		link(rel="icon" type="image/png" sizes="96x96" href="#{url_site}/css/assets/favicons/android-chrome-96x96.png")
		link(rel="icon" type="image/png" sizes="144x144" href="#{url_site}/css/assets/favicons/android-chrome-144x144.png")
		link(rel="icon" type="image/png" sizes="192x192" href="#{url_site}/css/assets/favicons/android-chrome-192x192.png")

		//- Apple Favicons
		link(rel="apple-touch-icon" href="#{url_site}/css/assets/favicons/apple-touch-icon.png")
		link(rel="apple-touch-icon" sizes="57x57" href="#{url_site}/css/assets/favicons/apple-touch-icon-57x57.png")
		link(rel="apple-touch-icon" sizes="60x60" href="#{url_site}/css/assets/favicons/apple-touch-icon-60x60.png")
		link(rel="apple-touch-icon" sizes="72x72" href="#{url_site}/css/assets/favicons/apple-touch-icon-72x72.png")
		link(rel="apple-touch-icon" sizes="76x76" href="#{url_site}/css/assets/favicons/apple-touch-icon-76x76.png")
		link(rel="apple-touch-icon" sizes="114x114" href="#{url_site}/css/assets/favicons/apple-touch-icon-114x114.png")
		link(rel="apple-touch-icon" sizes="120x120" href="#{url_site}/css/assets/favicons/apple-touch-icon-120x120.png")
		link(rel="apple-touch-icon" sizes="144x144" href="#{url_site}/css/assets/favicons/apple-touch-icon-144x144.png")
		link(rel="apple-touch-icon" sizes="152x152" href="#{url_site}/css/assets/favicons/apple-touch-icon-152x152.png")
		link(rel="apple-touch-icon" sizes="180x180" href="#{url_site}/css/assets/favicons/apple-touch-icon.png")

		//- Windows Tiles
		meta(name="msapplication-TileImage" content="#{url_site}/css/assets/favicons/mstile.png")
		meta(name="msapplication-square70x70logo" content="#{url_site}/css/assets/favicons/mstile-70x70.png")
		meta(name="msapplication-square150x150logo" content="#{url_site}/css/assets/favicons/mstile-150x150.png")
		meta(name="msapplication-wide310x150logo" content="#{url_site}/css/assets/favicons/mstile-310x150.png")
		meta(name="msapplication-square310x310logo" content="#{url_site}/css/assets/favicons/mstile-310x310.png")

		//- Schema.org markup for Google 
		meta(property="og:type" content="website")
		meta(name="description" content="#{descripcion}")
		
		meta(itemprop="name" content="#{titulo}")
		meta(itemprop="description" content="#{descripcion}")
		meta(property="og:image" itemprop="image primaryImageOfPage" content="#{url_site}/css/assets/home.jpg")

		//- Twitter Card data
		meta(name="twitter:card" content="summary_large_image")
		meta(name="twitter:title" property="og:title" itemprop="title name" content="#{titulo}")
		meta(name="twitter:description" content="#{descripcion}")
		meta(name="twitter:site" content="#{username}")
		meta(name="twitter:creator" content="#{creator}")
		meta(name="twitter:image:width" content="768")
		meta(name="twitter:image:height" content="320")
		meta(name="twitter:image" property="og:image" itemprop="image primaryImageOfPage" content="#{url_site}/css/assets/home.jpg")

		//- Facebook Open Graph data
		meta(prefix="og: http://ogp.me/ns#" property="og:title" itemprop="title name" content="#{titulo}")
		meta(prefix="og: http://ogp.me/ns#" property="og:url" content="#{url_site}")
		meta(prefix="og: http://ogp.me/ns#" property="og:image" itemprop="image primaryImageOfPage" content="#{url_site}/css/assets/home.jpg")
		meta(prefix="og: http://ogp.me/ns#" property="og:description" content="#{descripcion}")
		meta(prefix="og: http://ogp.me/ns#" property="og:site_name" content="#{site_name}")
		meta(prefix="og: http://ogp.me/ns#" property="og:type" content="article")
		meta(prefix="og: http://ogp.me/ns#" property="og:image:width" content="768")
		meta(prefix="og: http://ogp.me/ns#" property="og:image:height" content="320")

		title #{titulo}
		link(href="css/styles.css" rel="stylesheet")