Sources: https://stackoverflow.com/questions/44988163/create-self-signed-certificate-for-testing-localhost-and-have-it-accepted-by-the http://woshub.com/how-to-create-self-signed-certificate-with-powershell/ https://stackoverflow.com/questions/4691699/how-to-convert-crt-to-pem/4691749#4691749 https://webpack.js.org/configuration/dev-server/#devserver-https If you develop with Webpack under Windows and you want to open your localhost server in HTTPS with IE11 you may receive a message like : « Content was blocked because it was not signed by a valid security certificate. » Below I explain the steps to make it work with IE11: […]