4. World Wide Web Consortium (W3C)
The World Wide Web Consortium (W3C) is an international organisation responsible for developing and maintaining the official standards and specifications for the web, including HTML and CSS. Its purpose is to ensure that web technologies work consistently across different browsers and devices by defining clear rules for how they should behave.
The W3C also produces important accessibility guidelines such as the Web Content Accessibility Guidelines (WCAG), which help make websites more usable for people with disabilities. Together, these standards ensure the web remains interoperable, accessible, and reliable for all users.
You can access the W3C site at https://www.w3.org. From there, you can navigate to different sections such as HTML, CSS, and accessibility standards which are found under Standards & groups and W3C standards & drafts.
As you will see, W3C is not just responsible for the HTML, CSS, and Web Content Accessibility Standards.