Contains language specific links.
Public specification of a preferred URL for a page allows search engines to understand the original location for content.
Page contains links to disable or enable DNS prefetching of links in the page.
The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook
Twitter cards make it possible for you to attach media experiences to Tweets that link to your content.
The DOCTYPE is a required preamble for HTML5 websites.
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.
This page contains tags that are specific to an HTML 5 implementation.
This page contains HTML5 style media tags. HTML5 is the proposed next standard for HTML 4.01, XHTML 1.0 and DOM Level 2 HTML.
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.
The description attribute provides a concise explanation of the page content.
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.