Grid color, opacity, and dash-array

[mbostock]

There’s not an easy way to change the color of grid lines (without also changing the ticks, tick labels, axis labels, etc.). There should be, and it’d be nice if we could demonstrate a ggplot2-style theme.

[mbostock]

Related to axis styles #6.

[ericemc3]

It is aesthetically interesting to differentiate the appearance of certain grid lines:

Note : this is possible with vega-lite: with the properties gridOpacity or gridDash for example, to which one can associate a function.