Une mise en oeuvre intéressante de Annotator.js (shaare précédent). Les annotations peuvent être enregistrées, par exemple via le service d'hypothes.is

Existe sous forme d'extension pour chrome ou firefox, ou encore bookmarklet.

Le code est ouvert et peut être installé sur un serveur de production, uniquement via Docker.

Annotator is an open-source JavaScript library to easily add annotation functionality to any webpage. Annotations can have comments, tags, links, users, and more. Annotator is designed for easy extensibility so its a cinch to add a new feature or behaviour. Annotator also fosters an active developer community with contributors from four continents, building 3rd party plugins allowing the annotation of PDFs, EPUBs, videos, images, sound, and more.

Annotations are typically used to convey information about a resource or associations between resources. Simple examples include a comment or tag on a single web page or image, or a blog post about a news article.

The Web Annotation Data Model specfication describes a structured model and format to enable annotations to be shared and reused across different hardware and software platforms. Common use cases can be modeled in a manner that is simple and convenient, while at the same time enabling more complex requirements, including linking arbitrary content to a particular data point or to segments of timed multimedia resources.