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
Content Security Policy is a computer security concept, to prevent cross-site scripting XSS attacks.
JavaScript is a scripting language most often used for client-side web development.
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.
Public specification of a preferred URL for a page allows search engines to understand the original location for content.
oEmbed is a format for allowing an embedded representation of a URL on third party sites.
The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook
The @font-face rule allows for linking to fonts that are automatically activated when needed.
This page contains tags that are specific to an HTML 5 implementation.
The DOCTYPE is a required preamble for HTML5 websites.
Requests made from a document, and for navigations away from that document are associated with a Referrer header. This policy determines in the browser should send a referrer or not.
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.
Implicitly stating that cookie loaded from this website be sent in all contexts.
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.
Used to disable MIME-sniffing for a particular HTTP response.
A mechanism for developers to signal a relative priority for browsers to consider when fetching resources.