W3C Annotation Working Group

The W3C Annotation Working Group is part of the World Wide Web Consortium, focused on developing standards for adding digital notes or comments—called annotations—to online content. These annotations help users highlight or comment on specific parts of web pages or documents, making collaboration, research, and content analysis more effective. The group ensures that these annotation systems are interoperable across different platforms and tools, promoting consistency and accessibility on the web. Their work supports richer, more interactive online experiences by defining how annotations should be created, stored, and shared in a standardized way.