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The virtual machine (emulated CPU, devices) and the OS are running fully client-side:

It's a real VM running in your browser, in Javascript.

Technical depth? Did you click the link?

> Run Linux or other Operating Systems in your browser!

It runs in your browser.

If you clicked the link you would also see demo links that run in your browser.

No need to be abrasive, many companies offer things "in your browser" yet they merely send you the frontend and instruct your browser to connect to their backend.

Such as gaming SaaS thingies.