The stoplight indicator and a few other things were done via client side js with non obvious variables names. Once that Greasemonkey script came out it was quic

The stoplight indicator and a few other things were done via client side js with non obvious variables names. Once that Greasemonkey script came out it was quickly moved to the server side since there was no reason not to do it there. I believe it was just on the client side due to ease of development when it was being built.