I find it ridiculous that javascript is the only language available for the web. Almost every other platform, from bare metal to Excel, support multiple languages. It's well past due to untie the browser from a mandated language.
People are using a variety languages that compile to JS on the frontend for many years. Elm, TypeScript, ClojureScript, Reason, Scala.js, Fable, etc. In fact even modern JS is often compiled into backward compatible legacy-JS these days.
WebAssembly is porting the C machine model to the web, so for the foreseeable future JS is still going to be a better runtime for most GCd languages.