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HTML5 and CSS3: Visual QuickStart Guide, Seventh Edition by Bruce Hyslop, Elizabeth Castro

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Progressive Enhancement: A Best Practice

I began the introduction by speaking of the universality of the Web—the notion that information on the Web should be accessible to all. Progressive enhancement helps you build sites with universality in mind. It is not a language, rather it’s an approach to building sites that Steve Champeon created in 2003 (http://en.wikipedia.org/wiki/Progressive_enhancement).

The idea is simple but powerful: Start your site with HTML content and behavior that is accessible to all visitors Image. To the same page, add your design with CSS and add additional behavior with JavaScript, typically loading them from external files ...

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