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

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, allowing different styles to

Creating interactive, native-feeling transitions between page states directly in the stylesheet. The "engine" of responsiveness