This document summarizes the key changes between Open Annotations and the W3C Web Annotations specification, and their impact on IIIF Presentation API 3.0. Some of the main changes include: 1) Splitting the annotation model and vocabulary into separate specifications for cleaner JSON; 2) Adding an annotation protocol for creating/updating annotations; 3) Replacing complex body types with simpler TextualBody; 4) Using fragment selectors instead of direct fragment URIs to select parts of resources; 5) Replacing annotation lists and layers with AnnotationPages and AnnotationCollections from Activity Streams. Overall the changes aim to improve the specifications for developers through cleaner JSON, better documentation, and a stricter definition of properties and values.