Progressive Enhancement Approach
Progressive Enhancement is the design principle of starting with a solid foundation of HTML for content and semantics, adding CSS for styling, and then layering JavaScript to enhance interactivity. This ensures that the core experience works everywhere, while richer experiences are available for capable browsers.
Start with clean HTML: Ensure all essential content and functionality (like forms, links, and buttons) work without JavaScript.
Add CSS for presentation: Use CSS to improve readability, layout, and visual hierarchy, without breaking the underlying HTML structure.
Enhance with JavaScript: Add interactivity such as validation, animations, or dynamic loading — but keep the base functionality intact.
Graceful degradation: If JavaScript fails or is unavailable, the page should still remain usable and accessible.
In short: By designing with HTML and CSS first, you guarantee accessibility and usability for all users, while JavaScript adds optional enhancements for modern browsers.