PostCSS - a tool for transforming CSS with JavaScriptAdd vendor prefixes to CSS rules using values from Can I Use. Autoprefixer will use the data based on current browser popularity and property support to apply prefixes for you. :fullscreen { }CSS input:-webkit-full-screen { } :-ms-fullscreen { } :fullscreen { }CSS output PostCSS Preset Env, lets you convert modern CSS into something most browsers can understand, determining the polyfills you need
