Don't Roll Your Own

The author argues that modern web developers should avoid implementing custom versions of features that browsers and operating systems already handle well, drawing a parallel to the cryptography principle of "don't roll your own crypto." Examples of features developers shouldn't customize include scrolling, link navigation, text selection, and date pickers, as doing so typically degrades user experience by breaking familiar, intuitive behaviors that users depend on daily. The author emphasizes this is a user's perspective lamenting frustrating modern web design patterns rather than a professional design guide.