Why Horizontal Scrolling Never Caught On

There is a question that sounds simple and turns out not to be. If a phone — held vertically, scrolled vertically — feels natural, why doesn’t a laptop screen, which is shaped horizontally, scroll the long way too!?

The honest answer is that the question is wrong, but it is wrong in a useful way.

Following it leads through forty-five years of computing decisions: the CSS specification, which is symmetric on both axes; Microsoft’s Windows 8 gamble, which bet that touch was about to replace the keyboard and mouse; a small Wayland compositor called niri, which makes horizontal scrolling work precisely because it assumes a trackpad user from the start; the document model that PARC popularised in the 1970s and that Word, HTML, and CSS inherited; and the canvas tools that emerged when computing decided the screen wanted to be something other than a digital way to view docments.

The video does not argue that horizontal scrolling should be more popular. It argues that its rarity is not an accident, and that understanding why takes you through some of the more interesting decisions in personal-computing history.

Hope you enjoy it.