Its early application was mostly mouseovers – images changing when you put your mouse cursor over them. Eventually someone invented popups and the Internet was hit by the second wave of digital pollution, spam being the first.
My old website came to be in April of 2006. It was my first Drupal site ever built and actually the launchpad of my Drupal career. The two month long project was done on Drupal 4.6 and took an awful amount of dead kittens – i.e. core hacks to complete. I've mended my ways since but the site was in no state to be upgraded. Instead of trying to migrate content I decided to make a static version (I will explain how I did that further on in this post). The website was highly specialized for what I was doing back then.