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There's clara. Been around for 10+ years? https://clara.io/

https://web.autocad.com/

https://www.onshape.com/

There's lots of simpler ones or ones for specific needs

https://www.figuro.io/

https://www.tinkercad.com/ (for 3d printing?)

https://sketchup.trimble.com/en/plans-and-pricing/sketchup-f...

https://spline.design/

Looks like those are not open source?

I think I have seen people who do 3D modeling objects to later print them on 3D-printers use open source software in the browser. But I could be wrong.

A lot of them use onshape. In-browser but not open source. Free for public use though. Not sure what you’ve seen.

Theoretically you could compile Blender via Emscripten into a webpage. Kind of like someone compile Audacity into a webpage.

https://wavacity.com/

Of course I feel like web based editor would have accounts, cloud storage, multi-user (like Google Docs, Figma), and a bunch of other things, streaming files, streaming textures, etc.... Still, it might run with no mods :P

Three.js editor, Tinkercad, and PlayCanvas are all capable browser-based 3D editors with different strengths (modeling, CAD, and game development respectively).

Waiting for a decade for good Web based 3D graphical debuggers, other than coloured pixels....