Almost all the browsers present today are able to detect if certificate of certain website is expired or it does not have the certificate signed by a known company. In that case a warning message usually appears on the first page saying the problem with the certificate. One can then move on to the website or leave the page right there. | Almost all the browsers present today are able to detect if certificate of certain website is expired or it does not have the certificate signed by a known company. In that case a warning message usually appears on the first page saying the problem with the certificate. One can then move on to the website or leave the page right there. |