Please see: https://github.com/kevinSuttle/html-meta-tags, thanks for the idea @dandv!
Copied from http://code.lancepollard.com/complete-list-of-html-meta-tags/
<meta charset="UTF-8">
<meta name="keywords" content="your, tags">
<meta name="description" content="150 words">
<meta name="subject" content="your website"s subject">
<meta name="copyright" content="company name">
<meta name="language" content="ES">
<meta name="robots" content="index,follow">
<meta name="revised" content="Sunday, July 18th, 2010, 5:15 pm">
<meta name="abstract" content="">
<meta name="topic" content="">
<meta name="summary" content="">
<meta name="Classification" content="Business">
<meta name="author" content="name, [email protected]">
<meta name="designer" content="">
<meta name="reply-to" content="[email protected]">
<meta name="owner" content="">
<meta name="url" content="http://www.websiteaddrress.com">
<meta name="identifier-URL" content="http://www.websiteaddress.com">
<meta name="directory" content="submission">
<meta name="pagename" content="jQuery Tools, Tutorials and Resources - O'Reilly Media">
<meta name="category" content="">
<meta name="coverage" content="Worldwide">
<meta name="distribution" content="Global">
<meta name="rating" content="General">
<meta name="revisit-after" content="7 days">
<meta name="subtitle" content="This is my subtitle">
<meta name="target" content="all">
<meta name="HandheldFriendly" content="True">
<meta name="MobileOptimized" content="320">
<meta name="date" content="Sep. 27, 2010">
<meta name="search_date" content="2010-09-27">
<meta name="DC.title" content="Unstoppable Robot Ninja">
<meta name="ResourceLoaderDynamicStyles" content="">
<meta name="medium" content="blog">
<meta name="syndication-source" content="https://mashable.com/2008/12/24/free-brand-monitoring-tools/">
<meta name="original-source" content="https://mashable.com/2008/12/24/free-brand-monitoring-tools/">
<meta name="verify-v1" content="dV1r/ZJJdDEI++fKJ6iDEl6o+TMNtSu0kv18ONeqM0I=">
<meta name="y_key" content="1e39c508e0d87750">
<meta name="pageKey" content="guest-home">
<meta itemprop="name" content="jQTouch">
<meta http-equiv="Expires" content="0">
<meta http-equiv="Pragma" content="no-cache">
<meta http-equiv="Cache-Control" content="no-cache">
<meta http-equiv="imagetoolbar" content="no">
<meta http-equiv="x-dns-prefetch-control" content="off"><meta name="apple-mobile-web-app-title" content="My App"> <!-- New in iOS6 -->
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-touch-fullscreen" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="format-detection" content="telephone=no">
<meta name="viewport" content="width=device-width; content="width = 320; initial-scale=1.0; maximum-scale=1.0; user-scalable=yes; target-densitydpi=160dpi">
<link href="/apple-touch-icon.png" rel="apple-touch-icon" type="image/png">
<link href="touch-icon-ipad.png" rel="apple-touch-icon" sizes="72x72">
<link href="touch-icon-iphone4.png" rel="apple-touch-icon" sizes="114x114">
<link href="/startup.png" rel="apple-touch-startup-image">
<link href="http://github.com/images/touch-icon-iphone4.png" sizes="114x114" rel="apple-touch-icon-precomposed">
<link href="http://github.com/images/touch-icon-ipad.png" sizes="72x72" rel="apple-touch-icon-precomposed">
<link href="http://github.com/images/apple-touch-icon-57x57.png" sizes="57x57" rel="apple-touch-icon-precomposed"><link rel="mask-icon" href="website_icon.svg" color="red"><meta http-equiv="Page-Enter" content="RevealTrans(Duration=2.0,Transition=2)">
<meta http-equiv="Page-Exit" content="RevealTrans(Duration=3.0,Transition=12)">
<meta name="mssmarttagspreventparsing" content="true">
<meta content="IE=edge,chrome=1" http-equiv="X-UA-Compatible"/>
<meta name="msapplication-starturl" content="http://blog.reybango.com/about/">
<meta name="msapplication-window" content="width=800;height=600">
<meta name="msapplication-navbutton-color" content="red">
<meta name="application-name" content="Rey Bango Front-end Developer">
<meta name="msapplication-tooltip" content="Launch Rey Bango"s Blog">
<meta name="msapplication-task" content="name=About;action-uri=/about/;icon-uri=/images/about.ico">
<meta name="msapplication-task" content="name=The Big List;action-uri=/the-big-list-of-javascript-css-and-html-development-tools-libraries-projects-and-books/;icon-uri=/images/list_links.ico">
<meta name="msapplication-task" content="name=jQuery Posts;action-uri=/category/jquery/;icon-uri=/images/jquery.ico">
<meta name="msapplication-task" content="name=Start Developing;action-uri=/category/javascript/;icon-uri=/images/script.ico">
<meta name="msvalidate.01" content="6E3AD52DC176461A3C81DD6E98003BC9">
<meta http-equiv="cleartype" content="on"><meta name="application-name" content=" Contoso" />
<meta name="msapplication-TileColor" content=" #009900" />
<meta name="msapplication-square70x70logo" content="images/smalltile.png" />
<meta name="msapplication-square150x150logo" content="images/mediumtile.png" />
<meta name="msapplication-wide310x150logo" content="images/widetile.png" />
<meta name="msapplication-square310x310logo" content="images/largetile.png" />
<meta name="msapplication-notification" content="frequency=30; polling-uri=notifications/contoso1.xml;
polling-uri2=notifications/contoso2.xml; polling-uri3=notifications/contoso3.xml" /><meta name="blogcatalog"><meta name="csrf-param" content="authenticity_token">
<meta name="csrf-token" content="/bZVwvomkAnwAI1Qd37lFeewvpOIiackk9121fFwWwc="><link rel="alternate" type="application/rss+xml" title="RSS" href="http://feeds.feedburner.com/martini">
<link rel="alternate" type="application/atom+xml" title="Atom 0.3" href="https://example.com/feed.atom">
<link rel="shortcut icon" type="image/ico" href="/favicon.ico">
<link rel="fluid-icon" type="image/png" href="/fluid-icon.png">
<link rel="me" type="text/html" href="http://google.com/profiles/thenextweb">
<link rel="shortlink" href="http://blog.unto.net/?p=353">
<link rel="archives" title="May 2003" href="http://blog.unto.net/2003/05/">
<link rel="index" title="DeWitt Clinton" href="http://blog.unto.net/">
<link rel="start" title="Pattern Recognition 1" href="http://blog.unto.net/photos/pattern_recognition_1_about/">
<link rel="bookmark"title="Styleguide" href="http://paulrobertlloyd.com/about/styleguide/">
<link rel="search" href="/search.xml" type="application/opensearchdescription+xml" title="Viatropos">
<link rel="self" type="application/atom+xml" href="http://www.syfyportal.com/atomFeed.php?page=3">
<link rel="first" href="http://www.syfyportal.com/atomFeed.php">
<link rel="next" href="http://www.syfyportal.com/atomFeed.php?page=4">
<link rel="previous" href="http://www.syfyportal.com/atomFeed.php?page=2">
<link rel="last" href="http://www.syfyportal.com/atomFeed.php?page=147">
<link rel="canonical" href="http://smallbiztrends.com/2010/06/9-things-to-do-before-entering-social-media.html">
<link rel="EditURI" type="application/rsd+xml" title="RSD" href="http://smallbiztrends.com/xmlrpc.php?rsd">
<link rel="pingback" href="http://smallbiztrends.com/xmlrpc.php">
<link rel="stylesheet" media="only screen and (max-device-width: 480px)" href="http://wordpress.org/style/iphone.css" type="text/css">
<link rel="wlwmanifest" href="http://www.example.com/wp-includes/wlwmanifest.xml" type="application/wlwmanifest+xml">
<link rel="help" title="FAQ" href="/faq">
<link rel="logo" type="image/svg" href="https://playfoursquare.s3.amazonaws.com/press/logo/foursquare-logo.svg">
<link rel="P3Pv1" href="/w3c/p3p.xml">
<link rel="publisher" href="https://plus.google.com/115081025762845243709/">
<link rel="image_src" href="http://du3itj18e4z0b.cloudfront.net/7b29fe/images/icon-facebook.gif" type="image/jpeg">
<link rel="author" href="humans.txt" type="text/plain">
<link href="http://thenextweb.com/2009/01/08/how-to-snap-up-that-twitter-username-youve-always-wanted/" rel="original-source">
<link rel="profile" title="Microformats" href="http://microformats.org/profile/specs/">
<link rel="profile" href="http://gmpg.org/xfn/11">
(Initially written on https://gist.github.com/whitingx/3840905, but looks like the lists are the same - therefore the input may be valuable for some of you).
Great job, but it's already outdated - see below
<meta name='fb:page_id' content='43929265776'><meta name='application-name' content='foursquare'><meta name='og:country-name' content='USA'><meta name='og:latitude' content='37.416343'><meta name='og:longitude' content='-122.153013'><meta name='og:street-address' content='1601 S California Ave'><meta name='og:locality' content='Palo Alto'><meta name='og:region' content='CA'><meta name='og:postal-code' content='94304'><meta name='og:country-name' content='USA'><meta property="og:locale" content="en_GB" /><meta property="og:locale:alternate" content="fr_FR" /><meta property="og:locale:alternate" content="es_ES" />All HTTP meta headers (
http-equiv) are basically for IE9 and below. These should've been added on the back-end, see explanation: #1 and #2.According to W3C meta tags docs there are way less meta tags. Namely:
<meta charset="UTF-8"><meta name="description" content="Free Web tutorials"><meta name="keywords" content="HTML, CSS, JavaScript"><meta name="author" content="John Doe"><meta name="viewport" content="width=device-width, initial-scale=1.0">However, as you'll see in point 7 around half from this list still exists, however they're considered to be bad tags.
<meta name="Classification" content="Business"><meta name="HandheldFriendly" content="True"><meta name="MobileOptimized" content="320">IE-related tags shouldn't be used, we (almost, almost) don't use Internet Explorer anymore.
For further reading if to use any of those you may check this article, many of those tags are actually bad tags.