WebVM is a server-less virtual Linux environment running fully client-side in HTML5/WebAssembly in your browser.
It is available as a Dockerfile

OMG: WebAssembly is a Lisp dialect !!! -> https://developer.mozilla.org/en-US/docs/WebAssembly/Understanding_the_text_format

"On February 28, the four major browsers announced their consensus that the MVP of WebAssembly is complete. Firefox turned WebAssembly support on-by-default about a week after that, and Chrome followed the next week. It is also available in preview versions of Edge and Safari."