if you have property, and you have propertyStart, propertyEnd is implicit. The same goes for value and valueStart.
```
CSS_MIXED_ACTIVECONTENT: function(parser, property, propertyStart, value, valueStart) {
     return {
        cssProperty: {
          property: property,
          start: propertyStart,
          end: propertyStart + property.length
        },
        cssValue: {
          value: value,
          start: valueStart,
          end: valueStart + value.length
        }
      };
}
```
This also makes your function call and signature shorter, which keeps the code more readable.