Building Modals with Only HTML and CSS: Techniques and Limitations

This article by Max Prilutskiy explores how to create modal windows using only HTML and CSS, without relying on JavaScript. It introduces two CSS techniques: the ‘:target’ pseudo-class and the ‘checkbox hack’, both of which enable interactive behavior such as opening and closing modals. The ‘:target’ method triggers a modal via a URL fragment and is simple to implement, though it affects browser history. The ‘checkbox hack’ uses a hidden input and associated labels to toggle visibility, avoiding URL changes and offering more control. Both techniques rely on CSS properties like ‘position: fixed’, ‘opacity’, ‘pointer-events’, and ‘z-index’ to manage visibility and layout. The article also covers responsive design, animation enhancements, and basic accessibility practices, such as using ARIA attributes. It concludes by highlighting use cases suitable for CSS-only modals—like image galleries, alerts, or simple forms—while acknowledging their limitations for complex interactions or accessibility needs. Overall, the tutorial demonstrates creative ways to leverage CSS for UI functionality typically handled by JavaScript.