W3C's easy-to-use markup validation service, based on SGML and XML parsers.
Introduces the Web Content Accessibility Guidelines (WCAG) international standard, including WCAG 2.0, WCAG 2.1, and WCAG 2.2. WCAG documents explain how to make web content more accessible to people with disabilities.
Accessibility resources free online from the international standards organization: W3C Web Accessibility Initiative (WAI).
The set of common methods for HTTP/1.1 is defined below. Although this set can be expanded, additional methods cannot be assumed to share the same semantics for separately extended clients and servers. The Host request-header field...
This section defines the syntax and semantics of all standard HTTP/1.1 header fields. For entity-header fields, both sender and recipient refer to either the client or the server, depending on who sends and who receives the entity. 14.1...
In short: Learn about HTTP/1.1 Header Field Definitions and optimize your web content with Accept headers for specific media types. (AI summary)
W3C QA - How and why to use international date format in your document.
W3C QA - This guide reviews the correct way to add a favicon to your Web site and address some issues related to it.
Note: This document is obsolete, and is retained here for historical purposes only. It was published on 5 November 1996, as a proposal specification for sRGB as a standard default color space. sRGB has since been standardized within the International Electrotechnical Commission (IEC) as IEC...
You are probably familiar with SOAP/1.1. You have heard of SOAP Version 1.2 but don't know exactly what's the relationship between the two. This document outlines the changes and benefits brought by SOAP Version 1.2. SOAP Version 1.2: cleaner, better Web integration, more versatile, faster....
Accessibility resources free online from the international standards organization: W3C Web Accessibility Initiative (WAI).