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.
The HTTP Strict-Transport-Security (HSTS) header instructs the browser to only use https.
Public specification of a preferred URL for a page allows search engines to understand the original location for content.
The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook
[url] uses conditional comments that are supported by Microsoft Internet Explorer. They allow web developers to show or hide HTML code based on the version of the viewer's browser.
Twitter cards make it possible for you to attach media experiences to Tweets that link to your content.
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.
The picture element provides images for different devices and is part of the HTML 5.1 specification.
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.
Adapting images for high-resolution and low-resolution displays.
SRI is a W3C specification that allows web developers to ensure that resources hosted on third-party servers have not been tampered with.
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 page shows content with an iframe; an embedded frame that loads another webpage.
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.