Student Council President
While I agree with the sentiment that it's unrealistic to expect support for (very) old browsers, it tends to have little to do with security. Most new security measures over the past few years actually have an inverse effect: old site won't work in newer browsers. The things that break "modern" sites on old browsers are often times trivial in nature (using new fancy styling/elements or vendor specific features).Technically speaking what you are asking for is next to impossible. Old browers simply won't work with the latest web protocols and security encryptions. Sure some websites will use outdated systems to retain that support but there comes a time when that quickly becomes a hindrance.