My favorite piece of GIF trivia is that in the original spec, GIF animations would play once and only once. Netscape used the Application Extension block to add

My favorite piece of GIF trivia is that in the original spec, GIF animations would play once and only once. Netscape used the Application Extension block to add number of loops or loop indefinitely. An Application Extension requires an application identifier. So basically every animated GIF ever made has the string `NETSCAPE2.0` in it. https://en.wikipedia.org/wiki/GIF#Animated_GIF https://en.wikipedia.org/wiki/GIF#Animated_GIF