Modernizr
Modernizr is a small JavaScript library that's used to automatically detect features and/or technologies (such as HTML5) in your user's browser. The purpose of this tool is to optimize your website user's experience based on their unique browser. You can use Modernizr to offer a pleasant browsing experience on your site, no matter how new or outdated the browser is:
ModerniZR (https://modernizr.com/)