Future-Proof CSS

Your CSS fails silently. Learn to build a resilient foundation that adapts to any browser, now and in the future.

#1about 4 minutes

The web's foundational principle of backward compatibility

Web technologies are designed not to break older sites, ensuring longevity even for pages with deprecated or missing HTML elements.

#2about 4 minutes

Building for resilience with progressive enhancement

Progressive enhancement starts with a core experience for the least capable devices and adds features for modern browsers, unlike graceful degradation.

#3about 2 minutes

The unique challenges of progressive enhancement in CSS

Unlike JavaScript, CSS lacks robust built-in feature detection and error handling, which causes styles to fail silently without feedback.

#4about 5 minutes

Core techniques for writing robust and resilient CSS

Start with sensible HTML, leverage the cascade for fallbacks, use mobile-first media queries, and use older, well-supported properties when needed.

#5about 2 minutes

Using feature queries for progressive enhancement

Use positive @supports queries to apply modern CSS as an enhancement, ensuring a functional baseline for browsers that don't support feature queries.

#6about 6 minutes

Writing CSS for a global audience with internationalization

Adapt layouts for different languages and writing directions by using logical properties like `margin-inline-start` instead of physical ones like `margin-left`.

#7about 5 minutes

Using the right tool for the right job for accessibility

Improve accessibility by using HTML for content, CSS for styling, and JavaScript for functionality, avoiding hacks like using CSS pseudo-elements for labels.

#8about 3 minutes

Preserving accessibility when customizing default styles

When restyling default elements like buttons, ensure you provide accessible alternatives for focus states and adapt to user preferences like reduced motion.

#9about 6 minutes

Proactively auditing CSS for accessibility and compliance

Use browser developer tools like Firefox Accessibility Inspector and Lighthouse to audit for issues, but supplement them with real user testing for complete coverage.