“Pixar gets all the accolades today, but in the 90s this was a serious feat of computer animation.”
Blink inside marquee, a 1x1 spacer GIF stretched to any size, and a guestbook to sign. It was terrible, and everyone could view source and learn how it worked. Today’s pages ship megabytes of JavaScript to show the same paragraph. The spacer GIF at least admitted it was a hack.