Web standards are the formal, non-proprietary standards and other technical specifications that define and describe aspects of the World Wide Web. In recent years, the term has been more frequently associated with the trend of endorsing a set of standardized best practices for building web sites, and a philosophy of web design and development that includes those methods.
Web standards include many interdependent standards and specifications, some of which govern aspects of the Internet, not just the World Wide Web. Even when not web-focused, such standards directly or indirectly affect the development and administration of web sites and web services. Considerations include the interoperability, accessibility and usability of web pages and web sites.
Web standards consist of the following:
More broadly, the following technologies may be referred to as "web standards" as well:
Web standards are evolving specifications of web technologies. Web standards are developed by standards organizations—groups of interested and often competing parties chartered with the task of standardization—not technologies developed and declared to be a standard by a single individual or company. It is crucial to distinguish those specifications that are under development from the ones that already reached the final development status (in case of W3C specifications, the highest maturity level).
The earliest visible manifestation of the web standards movement was the Web Standards Project, launched in August 1998 as a grassroots coalition fighting for improved web standards support in browsers.
The web standards movement supports concepts of standards-based web design, including the separation of document structure from a web page or application's appearance and behavior; an emphasis on semantically structured content that validates (that is, contains no errors of structural composition) when tested against validation software maintained by the World Wide Web Consortium; and progressive enhancement, a layered approach to web page and application creation that enables all people and devices to access the content and functionality of a page, regardless of personal physical ability (accessibility), connection speed, and browser capability.
The Web Standards movement pioneered by Glenn Davis, George Olsen, Jeffrey Zeldman, Steven Champeon, Todd Fahrner, Eric A. Meyer, Tantek Çelik, Dori Smith, Tim Bray, Jeffrey Veen, and other members of the Web Standards Project replaced bandwidth-heavy tag soup with light, semantic markup and progressive enhancement, with the goal of making web content "accessible to all".
In 2007, Douglas Vos initiated the Blue Beanie Day, inspired by Jeffrey Zeldman, who is shown with a blue cap on the book cover of his 2003 book Designing with Web Standards. Since then, the 30 November is the annual international celebration of web standards and web accessibility.
When web standards are discussed, the following publications are typically seen as foundational:
Work in the W3C toward the Semantic Web is currently focused by publications related to the Resource Description Framework (RDF), Gleaning Resource Descriptions from Dialects of Languages (GRDDL) and Web Ontology Language (OWL).
A W3C Recommendation is a specification or set of guidelines that, after extensive consensus-building, has received the endorsement of W3C Members and the Director.
An IETF Internet Standard is characterized by a high degree of technical maturity and by a generally held belief that the specified protocol or service provides significant benefit to the Internet community. A specification that reaches the status of Standard is assigned a number in the IETF STD series while retaining its original IETF RFC number.
HTML 5 contains numerous "willful violations" of other specifications, in order to accommodate limitations of existing platforms.
There are compliance tests both for HTML code generated by websites as well as for the faithful interpretation of HTML code by web browsers.
W3C offers online services to test websites directly for both web site developers, as well as for website users. These include:
The Web Standards Project (WaSP), although development is officially inactive, continues to offer two levels of testing services for web browsers: