Though technically links aren't a requirement to make the internet function (you can get by on just urls), they are the primary reason why the web took off so gloriously. Linking is an essential part of every web page out there, without links we would be copying urls the entire time (or we wouldn't because who likes to work like that). But the implementation of links (the html a-element) has been
![the a element is broken](https://cdn-ak-scissors.b.st-hatena.com/image/square/29ecc8efbcc9031357cea7495659c90d3bad8e4f/height=288;version=1;width=512/https%3A%2F%2Fonderhond.com%2Fstyle%2Fsite%2Fonderhondcom-256.png)