Since coolelectronics posted his firefox wasm here ill post my sideproject (we worked on these around the same time), Webkit In WebAssembly (And actually modern and usable! Unlike the older trevorlinton/webkit.js project)

https://github.com/theogbob/WebkitWasm

Not as polished as the firefox port but is a fully working port of webkit ported with fable, opus and some glm 5.2.