What is grunt-modernizr?

Modernizr is a popular tool that helps websites detect what features a visitor's browser supports, so the site can adapt accordingly. The grunt-modernizr plugin wraps that tool into an automated build step for projects using Grunt, a JavaScript task runner. Instead of hand-picking which browser tests you need, this plugin scans your code and figures it out for you. When you run the build task, the plugin crawls through your project files looking for references to Modernizr tests in your JavaScript or Sass/CSS. It then generates a trimmed-down, minified version of Modernizr that includes only the tests you actually used. This keeps the file small, which means faster load times for your users. This is useful for developers and teams building websites that need to work across a wide range of browsers and devices. For example, if you are building a site that uses modern CSS features like flexbox or HTML5 video, Modernizr can detect whether a visitor's browser supports those features and let you provide fallbacks. Without this plugin, you would either ship the full Modernizr library (which includes hundreds of tests you may not need) or manually track which tests your project references and update that list every time something changes. The plugin supports multiple build targets and configuration options, such as enabling file parsing, adding custom tests, and controlling output. For the full set of settings, the README points to a companion project called Customizr. You can also use the online Modernizr build tool to visually configure your tests and then copy the resulting Grunt configuration into your project.