HTML Head Elements

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Basic Head Elements 

<title>Page Title</title>
<base href="https://example.com/page.html">
<style>
  body { color: red; }
</style>
<script src="script.js"></script>

Meta Element 

<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<meta name="keywords" content="your,keywords,here,comma,separated,no,spaces">
<meta name="description" content="150 chars">
<meta name="subject" content="your website's subject">
<meta name="language" content="en">
<meta name="robots" content="index,follow">
<meta name="googlebot" content="index,follow">
<meta name="google" content="nositelinkssearchbox">
<meta name="google-site-verification" content="verification_token">
<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@example.com">
<meta name="designer" content="">
<meta name="reply-to" content="email@example.com">
<meta name="owner" content="">
<meta name="url" content="https://example.com/">
<meta name="identifier-URL" content="https://example.com/">
<meta name="directory" content="submission">
<meta name="category" content="">
<meta name="coverage" content="Worldwide">
<meta name="distribution" content="Global">
<meta name="rating" content="General">
<meta name="referrer" content="never">
<meta name="revisit-after" content="7 days">
<meta http-equiv="refresh" content="300;url=https://example.com/">

<!-- Cache Control -->
<meta http-equiv="Expires" content="0">
<meta http-equiv="Pragma" content="no-cache">
<meta http-equiv="Cache-Control" content="no-cache">

Social

Facebook / Open Graph

<meta property="fb:app_id" content="123456789">
<meta property="og:url" content="https://example.com/page.html">
<meta property="og:type" content="website">
<meta property="og:title" content="Content Title">
<meta property="og:image" content="https://example.com/image.jpg">
<meta property="og:description" content="Description Here">
<meta property="og:site_name" content="Site Name">
<meta property="og:locale" content="en_US">
<meta property="article:author" content="">
<!-- Facebook: https://developers.facebook.com/docs/sharing/webmasters#markup -->
<!-- Open Graph: http://ogp.me/ -->

Facebook Open Graph Markup Open Graph protocol

Twitter

<meta name="twitter:card" content="summary">
<meta name="twitter:site" content="@site_account">
<meta name="twitter:creator" content="@individual_account">
<meta name="twitter:url" content="https://example.com/page.html">
<meta name="twitter:title" content="Content Title">
<meta name="twitter:description" content="Content description less than 200 characters">
<meta name="twitter:image" content="https://example.com/image.jpg">
<!-- More info: https://dev.twitter.com/cards/getting-started -->
<!-- Validate: https://dev.twitter.com/docs/cards/validation/validator -->

Twitter Cards: Getting Started Guide Twitter Card Validator

Google+/Schema.org

<meta itemprop="name" content="Content Title">
<meta itemprop="description" content="Content description less than 200 characters">
<meta itemprop="image" content="https://example.com/image.jpg">

Browser/Platform

Apple iOS

<!-- Smart App Banner -->
<meta name="apple-itunes-app" content="app-id=APP_ID,affiliate-data=AFFILIATE_ID,app-argument=SOME_TEXT">

<!-- Disable automatic detection and formatting of possible phone numbers -->
<meta name="format-detection" content="telephone=no">

<!-- Add to Home Screen -->
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-title" content="App Title">

<!-- Touch Icons -->
<link rel="apple-touch-icon" href="apple-touch-icon.png">
<link rel="apple-touch-icon-precomposed" href="apple-touch-icon-precomposed.png">
<!-- In most cases, one 180×180px touch icon in the head is enough -->
<!-- If you use art-direction and/or want to have different content for each device, you can add more touch icons -->

<!-- Startup Image -->
<link rel="apple-touch-startup-image" href="startup.png">

<!-- More info: https://developer.apple.com/safari/library/documentation/appleapplications/reference/safarihtmlref/articles/metatags.html -->

Apple Meta Tags

Apple Safari

<!-- Pinned Site -->
<link rel="mask-icon" href="icon.svg" color="red">

Google Android

<meta name="theme-color" content="#E64545">

<!-- Add to homescreen -->
<meta name="mobile-web-app-capable" content="yes">
<!-- More info: https://developer.chrome.com/multidevice/android/installtohomescreen -->

Google Chrome

<link rel="chrome-webstore-item" href="https://chrome.google.com/webstore/detail/APP_ID">

<!-- Disable translation prompt -->
<meta name="google" value="notranslate">

Microsoft Internet Explorer

<meta http-equiv="x-ua-compatible" content="ie=edge">
<meta http-equiv="cleartype" content="on">
<meta name="skype_toolbar" content="skype_toolbar_parser_compatible">

<!-- Pinned Site -->
<!-- IE 10 / Windows 8 -->
<meta name="msapplication-TileImage" content="pinned-tile-144.png">
<meta name="msapplication-TileColor" content="#009900">
<!-- IE 11 / Windows 9.1 -->
<meta name="msapplication-config" content="ieconfig.xml">

Microsoft Internet Explorer (LEGACY DO NOT USE)

<!-- Legacy Tags (DO NOT USE) -->
<meta name="mssmarttagspreventparsing" content="true">
<meta http-equiv="page-enter" content="revealtrans(duration=2,transition=2)">
<meta http-equiv="page-exit" content="revealtrans(duration=3,transition=12)">

Other Resources

Notes