Styling HTML <details> and <summary> with modern CSS

The article explores the customization of HTML <details> and <summary> elements, known collectively as a disclosure widget, which can be styled more easily as CSS evolves. It discusses how to animate the opening and closing actions of these widgets using newer CSS features like interpolate-size and ::details-content, although browser support is somewhat limited. Additionally, the piece covers styling the triangular marker associated with <summary>, highlighting that while Chrome and Firefox offer substantial support, Safari lags behind. It also introduces the concept of exclusive accordions, where only one disclosure widget can be open at a time, and emphasizes the importance of considering accessibility when styling, as hiding the marker can cause issues with screen readers. The article touches on ongoing efforts to improve the customization and interoperability of <details> across browsers, promising a future where developers won't need to rely on third-party components for disclosure widgets.

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