Modernizr
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Modernizr is a JavaScript library that detects the features available in a user's browser. This lets web pages avoid unsupported features by informing the user their browser is not supported or loading a polyfill. Wikipedia
Initial release: July 1, 2009; 14 years ago
License: MIT; it was dual-licensed MIT-BSD from June 14, 2010 to September 15, 2012
Stable release: 3.12 / February 15, 2022; 2 years ago