Following HTML, CSS and JavaScript, WebAssembly becomes the fourth language for the Web which allows code to run in the browser:
https://www.w3.org/2019/12/pressrelease-wasm-rec.html.en

Recent Study Estimates That 50% of Websites Using WebAssembly Apply It for Malicious Purposes:
https://www.infoq.com/news/2019/10/WebAssem...alicious-usage/