Using the upcoming CSS when/else rules

Learn about the upcoming CSS when/else rules which provide a mechanism for applying styles selectively based on specific conditions. These rules are still in the proposal stage and not yet implemented in browsers. The @when rule allows for selective styling, dynamic adaptability, specific conditions, user interaction, state and event styling, customization, and enhanced usability and aesthetics. The @when/@else rules simplify conditional styling and improve readability. They can be implemented by checking browser support, writing base CSS, defining conditions, using @when to apply conditional styles, and using @else for alternative styles. Some advanced techniques include combining with CSS preprocessors and using dynamic styling based on conditions. Best practices include planning CSS, using flexible units, maintaining consistency, and documenting code. Debugging techniques involve using browser DevTools, isolating rules, and eliminating possible causes of issues.