code: function checkFallback(obj) {
        var props = [];
        var hasFallback = [];
        var values = [];
  
        for (var prop in obj) {
          if (obj.hasOwnProperty(prop)) {
            var pro = obj[prop].prop;
  
            if (obj[prop].type === 'comment') {
              continue;
            }
  
            if (props.indexOf(pro) === -1) {
              props.push(pro);
              values.push({prop: pro, val:obj[prop].value});
            } else {
              var lookup = {};
  
              for (var i = 0, len = values.length; i < len; i++) {
                lookup[values[i].prop] = values[i].val;
              }
  
              if (lookup[pro].search('px') === -1 && obj[prop].value.search('rem') === -1 ||
              lookup[pro].search('rem') === -1 && obj[prop].value.search('px') === -1) {
                hasFallback.push(pro);
              }
            }
          }
        }
  
        return hasFallback;
      }
docs: Function to check if rem and px exist