Ten years ago, browser support for CSS layouts was wonky overall. Designers and developers advocated for web standards compliance, while creating hundreds of hacks that made CSS layouts work in all browsers. Today, CSS-based layouts are commonplace and every browser has pretty solid support for them. But now the situation of browser compliance is repeating itself with HTML5 and CSS3.
When you embed the Modernizr script in your page, it detects whether the current browser supports CSS3 features like @font-face, border-radius, border-image, box-shadow, rgba() and so forth, as well as HTML5 features like audio, video, localStorage, and the new <input> element types and attributes. It provides a script loader so you can pull in polyfills to backfill functionality in old browsers.
Sounds like a magical solution? Yes and no, for those developers who aren’t familar with using Modernizr, HTML5 or CSS3 it could take twice as long to develop a site this way, which can be seen as a major downfall. However, the learning curve is worth the time invested when looking at the big picture.
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