How to calculate CSS letter-spacing v.s. “tracking” in typography?

Question

I have instructions from a graphic designer for a layout that specifies \"track 100\" for some elements. In CSS letter-spacing is the equivalent property for \"

Answer 1

Tracking Conversion CSS “letter-spacing”

1 =1/1000 em
100 =100/1000 em =0.10 em
200 =200/1000 em =0.20 em