In UIKit under iOS/iPadOS, there’s a concept known as “readable width” which is dynamic and changes depending on the width of the device’s screen, and apps can

In UIKit under iOS/iPadOS, there’s a concept known as “readable width” which is dynamic and changes depending on the width of the device’s screen, and apps can take advantage of it to make blocks of text flow in a readable and pleasant way regardless of device form factor and orientation. I think this concept would be immensely useful in the browser. The closest one can get to that currently is to use media queries for a variety of screen widths with hand-tuned content widths, which is laborious and doesn’t leave room for user customization.