Collapsible sections are a fundamental interactive design pattern on the web, allowing users to toggle the visibility of content by clicking on a label. While the interaction is simple, it lacks a consistent native implementation across browsers, making it an excellent entry point into accessible interaction design using JavaScript and WAI-ARIA.
Throughout the article, the author emphasizes the importance of serving the needs of both end-users and fellow contributors and ensuring the interface is accessible, performant, and maintainable. The provided checklist offers valuable guidance for developers, reinforcing best practices such as avoiding large libraries for small interactions and supporting high-contrast themes.
