Windows 8 pinning functionality for websites.
Public specification of a preferred URL for a page allows search engines to understand the original location for content.
The Speculation Rules API enhances performance for future navigations by targeting document URLs, making it ideal for multi-page applications (MPAs) rather than single-page applications (SPAs).
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.
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 DOCTYPE is a required preamble for HTML5 websites.
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.
Adapting images for high-resolution and low-resolution displays.
The picture element provides images for different devices and is part of the HTML 5.1 specification.
Claims HTML 4.01 Transitional DTD, which includes presentation attributes and elements that W3C expects to phase out as support for style sheets matures.
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 page shows content with an iframe; an embedded frame that loads another webpage.
A mechanism for developers to signal a relative priority for browsers to consider when fetching resources.
JavaScript is a scripting language most often used for client-side web development.
This page contains a meta robots tag which tells search engines and robots to index or not index the page.
JSON-LD, or JavaScript Object Notation for Linked Data, is a method of transporting Linked Data using JSON.