Annotation

The practice of adding supplementary information, notes, or metadata to existing digital content, typically without modifying the original source. In accessibility, annotation is used to add alternative descriptions, labels, structural information, or other accessibility enhancements to web pages and digital documents that lack them. Collaborative annotation approaches allow volunteers, educators, or accessibility professionals to contribute accessibility improvements to content they do not own, enabling crowdsourced remediation of inaccessible websites. The W3C Web Annotation standard provides a framework for creating and sharing annotations across platforms and applications.