Feature detection is the first step we are able to provide as a progressive enhancement to website users.
Then, we have to test if the given feature is already implemented in the browser. If so, we do not need to reimplement anything that already exists, but if the browser is actually missing the feature, it is recommended to provide the correct support for that.
Sometimes we have to support browsers that have not completely implemented a specific feature yet. However, new features make a difference when your website is being viewed and popularity of the website often increases.
A cross-browser responsive design helper is simpler than Modernizr because its only function is detecting features, when the ...