The W3C standardized HTML annotations years ago. There's a difference between a standard not existing versus people pretending it doesn't exist because it's not implemented by Chrome.

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crazygringo 20 hours ago | parent [-]

That's different. Those are a data structure defining annotations that are meant to be stored externally. They're not part of an HTML file like PDF annotations are. They're meant more for live collaborative commenting within a shared online space, not for making private portable annotations like PDF does.

And it's not a Chrome thing. I don't think any browsers support it, do they? It's not really clear there's a need for it, when collaborative editors already handle document annotations in their own ways.

	▲	cxr 9 hours ago \| parent [-]
		So is there a need for it or isn't there? > That's different. Those are a data structure defining annotations that are meant to be stored externally. The protocol is a separate standard. The format is JSON-LD. Putting JSON-LD into HTML isn't a question mark. (There's info at W3C.org about how to do that, too. Not that it's necessary. You can guess what it says.)