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It was called VRML[0] and was superseded by X3D[1]

The article mentions a (discontinued) 3d browser, which would be a necessity probably for any type of metaversial web.

This reminds me of Adobe Atmosphere (https://en.wikipedia.org/wiki/Adobe_Atmosphere), which I greatly miss. It was a highlight of my early 2000s.

I remember that! I loved using an avatar that looked like a bush and then hiding in plain sight.

Lack of openness is a feature, not a bug.

You mean for the companies working on metaverses?