Autodrop3d had posted a bounty for getting OpenSCAD ported to web assembly.
https://forum.openscad.org/500-bounty-Web-assembly-port-of-openSCAD-td33527.html

The developer Dominick Schroer of https://schroer.ca collected the bounty publishing https://github.com/DSchroer/openscad-wasm

In the past Autodrop3Ds cloud platform had OpenSCAD support using server side processing of openSCAD scripts. It had a simple text editor and stl viewer using threeJS. This has not been replaced with the new client side WASM OpenSCAD environment that significantly reduces the back and forth bandwidth and increases the responsiveness.

You can try it for your self at https://openscad.cloud
Source code can be accessed by pressing the F12 hacker button.