Customize the snippet people see when your page is shared on Google+
Contains language specific links.
Public specification of a preferred URL for a page allows search engines to understand the original location for content.
Several search engines use this meta tag to find out when they should revisit a certain page.
Page contains links to disable or enable DNS prefetching of links in the page.
Allows a website to define how a page is rendered in Internet Explorer 8, allowing a website to decide to use IE7 style rendering over IE8 rendering.
The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook
Tags that webmasters can use to markup their pages in ways recognized by major search providers.
The DOCTYPE is a required preamble for HTML5 websites.
Defines the attributes of a web app in a simple JSON file. It describes how the web app should appear on the users system and how it should launch.
This page contains tags that are specific to an HTML 5 implementation.
A way to make Web content and Web applications more accessible to people with disabilities. It especially helps with dynamic content and advanced user interface controls developed with Ajax, HTML, JavaScript, and related technologies.
The defer attribute gives a hint to the browser that the script does not create any content so the browser can optionally defer interpreting the script. This can improve performance by delaying execution of scripts until after the body content is parsed and rendered.
Meta tag containing keywords related to the page.
The description attribute provides a concise explanation of the page content.
This page contains a meta robots tag which tells search engines and robots to index or not index the page.
Cascading Style Sheets (CSS) is a stylesheet language used to describe the presentation of a document written in a markup language. Its most common application is to style web pages written in HTML
JavaScript is a scripting language most often used for client-side web development.
JSON-LD, or JavaScript Object Notation for Linked Data, is a method of transporting Linked Data using JSON.