https://github.com/dtapuska/html-translate

https://groups.google.com/a/chromium.org/g/blink-dev/c/hmASm1yhi5s/m/7vqmt7CwDgAJ

https://www.chromestatus.com/feature/6298864638230528

Now Safari has a built-in translation service, so it might be worth tracking this to see if it is ever supported across more browsers.