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Annotation is now a web standard

Many have tried over the years to bring us annotations. The lack of standards has been one of the key things holding these efforts back– a need we highlighted in the first of our 12 original principles back in 2013 and have been working towards ever since.
Yesterday, on February 23, things took a giant leap forward when the W3C, the standards body for the Web, standardized annotation.
Twenty four years after Marc Andreessen first built collaborative annotation into Mosaic and tested it on a few “guinea pigs” before turning it off, annotations have finally become first-class citizens of the web.
From the W3C Web Annotation co-chairs, Rob Sanderson and Tim Cole:
“Many websites already allow comments, but current […] systems rely on unique, usually proprietary technologies chosen and provided by publishers. Notes cannot be shared easily across the Web and comments about a Web page can only be saved and viewed via


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