The code generator on the Examples page suggests "fillColor: undefined" for an empty/transparent fill under the sparklines. However, this didn't affect the fillColor in Chrome using jquery sparklines 2.1.2. Using "fillColor: false" produces the desired effect.
The same observation applies for minSpotColor and maxSpotColor.
The code generator on the Examples page suggests "fillColor: undefined" for an empty/transparent fill under the sparklines. However, this didn't affect the fillColor in Chrome using jquery sparklines 2.1.2. Using "fillColor: false" produces the desired effect.
The same observation applies for minSpotColor and maxSpotColor.