Check for IE and version

Test

        // https://codepen.io/gapcode/pen/vEJNZN
        // Check for IE
        // used for IE11 for declaration form grid layout


        // Get IE or Edge browser version
        var version = detectIE();

        if (version === false) {
          // document.getElementById('result').innerHTML = '<s>IE/Edge</s>';
          $('body').addClass('not-ie');
        } else if (version >= 12) {
          // document.getElementById('result').innerHTML = 'Edge ' + version;
          $('body').addClass('ie-edge' + version);
        } else {
          // document.getElementById('result').innerHTML = 'IE ' + version;
          $('body').addClass('ie-' + version);
        }

        // add details to debug result
        // document.getElementById('details').innerHTML = window.navigator.userAgent;

        /**
         * detect IE
         * returns version of IE or false, if browser is not Internet Explorer
         */
        function detectIE() {
          var ua = window.navigator.userAgent;

          // Test values; Uncomment to check result …

          // IE 10
          // ua = 'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0)';

          // IE 11
          // ua = 'Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko';

          // Edge 12 (Spartan)
          // ua = 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.71 Safari/537.36 Edge/12.0';

          // Edge 13
          // ua = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0 Safari/537.36 Edge/13.10586';

          var msie = ua.indexOf('MSIE ');
          if (msie > 0) {
            // IE 10 or older => return version number
            return parseInt(ua.substring(msie + 5, ua.indexOf('.', msie)), 10);
          }

          var trident = ua.indexOf('Trident/');
          if (trident > 0) {
            // IE 11 => return version number
            var rv = ua.indexOf('rv:');
            return parseInt(ua.substring(rv + 3, ua.indexOf('.', rv)), 10);
          }

          var edge = ua.indexOf('Edge/');
          if (edge > 0) {
            // Edge (IE 12+) => return version number
            return parseInt(ua.substring(edge + 5, ua.indexOf('.', edge)), 10);
          }

          // other browser
          return false;
        }

        // used for IE11 for declaration form grid layout
        // Check for IE
        // https://codepen.io/gapcode/pen/vEJNZN