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The "engine" of responsiveness, allowing different styles to be triggered based on the device's viewport size or resolution.

Responsive Web Design with HTML5 and CSS3: Build Responsive and Future-proof Websites to Meet the Demands of Modern Web Users The "engine" of responsiveness, allowing different styles to

Frain argues that desktop-only websites are no longer viable in an era of smartphones, tablets, and smart TVs. Instead of building separate sites for mobile and desktop, developers should use a "mobile-first" approach, ensuring the site "just works" regardless of the hardware used to access it. 2. Technical Pillars of the Modern Web The "engine" of responsiveness