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What is Progressive Enhancement?

A web design strategy that starts with basic functionality for all browsers and progressively adds advanced features for capable ones.

Progressive enhancement builds from a baseline of semantic HTML that works everywhere, adds CSS for visual presentation, then layers JavaScript for interactivity. This ensures content is accessible even if CSS or JavaScript fails to load. The approach contrasts with graceful degradation (building for modern browsers first, then patching for older ones). Examples include forms that work without JavaScript (standard submit), images with proper alt text, and server-side rendering with client-side enhancement. Progressive enhancement aligns with web accessibility, SEO (search engines primarily read HTML), and resilience. Feature detection (not browser detection) guides which enhancements to apply.

Related Terms

SEO (Search Engine Optimization)
The practice of optimizing websites to rank higher in search engine results, increasing organic traffic.
Caching
Storing copies of frequently accessed data in faster storage to reduce load times and server processing.
CDN (Content Delivery Network)
A distributed network of servers that delivers web content to users from the geographically closest location.
HTTP Status Codes
Standardized three-digit codes returned by web servers to indicate the result of a client's HTTP request.
AJAX
A technique for making asynchronous HTTP requests from a web page without reloading the entire page.
WebSocket
A communication protocol that enables full-duplex, real-time data exchange between a browser and server over a single connection.
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