Web Compatibility All about web compatibility. ECMAScript ECMAScript 5 (ES5) / 2015 (ES2015, formerly ES6) / 2016 (ES2016, formerly ES7) Web Platform Can I use Mozilla Developer Network Polyfills HTML5 Cross Browser Polyfills - Modernizr Old Browsers QuirksMode W3Help (Chinese) Browser Platform Status Google Chrome / Chromium / Opera / Blink Mozilla Firefox Microsoft Edge / Internet Explorer Apple Safari / WebKit