How do you serve your pages for feature-constrained browsers?

Techniques

• Graceful degradation: The practice of building an application for modern browsers while ensuring it remains functional in older browsers.
• Progressive enhancement: The practice of building an application for a base level of user experience, but adding functional enhancements when a browser supports it.
• Use caniuse.com to check for feature support.
• Autoprefixer for automatic vendor prefix insertion.
• Feature detection using Modernizr.
• Use CSS Feature queries via `@support``