Opera Developer News - Why use @supports instead of Modernizr? - 0 views
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The reason to use @supports over Modernizr is performance; functionality that's built into the browser will always be faster than adding it in script. Removing an external dependancy saves an HTTP request to download Modernizr and doesn't require time to execute the JavaScript.
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Should you use Modernizr or @supports? The answer is definitively "it depends". As with all web projects, only you can decide which is the best way.