Mastering the Art of Custom Accordions: Details and Summary Styling Grab a coffee and pull up a chair. We’ve all been there: a client asks for a slick, animated FAQ section or a nested accordion, and your first instinct is to reach for a heavy JavaScript library or start writing useState hooks in React. But why? The browser already gives us the <details> and <summary> tags. For a long time, these were the "ugly ducklings" of HTML—functional, but visually stubborn. Today, I’m going to show you how to turn these semantic workhorses into high-end UI components using nothing but modern CSS. How we suffered before Remember the "Checkbox Hack"? It was the wild west of frontend. If you wanted a toggleable element without JavaScript, you had to hide an <input type="checkbox"> , use a <label> to trigger it, and then use the adjacent sibling combinator ( + or ~ ) to show or hide a <div> . It was a semantic nightmare and a headache for screen readers.…