Axis label position: Allow customizing vertical position of axis label for Y axis

[nobarany]

The distance between the axis label and the chart is customizable in one direction. It'd be great to be able to expose a setting for the other direction (or for styling it in general) to allow more flexibility.

.attr("dy", labelAnchor === "center"
               ? axis === "right"
                   ? "-0.32em"
                   : "0.75em"
               : labelAnchor === "bottom"
                   ? "1.4em"
                   : "-1em")

The last condition ("-1em") seems too tight for my chart:

[Fil]

Can you share your chart?

[nobarany]

Sure:

Plot.plot({
    width,
    y: {
      grid: true,
      zero: true,
      label: 'Daily spending',
      tickFormat: (d: number) => `${formatCurrencySimple(d)}`,
      nice: true,
    },
    x: { tickRotate: -45, type: 'utc' },
    marks: [
      Plot.lineY(
        budget,
        Plot.map(
          { y: 'cumsum' },
          {
            x: xProp,
            y: yProp,
            sort: xProp,
            curve: 'step',
            stroke: 'gray',
          }
        )
      ),
    ],
    marginTop: 40,
    marginBottom: 60,
    marginLeft: 80,
  });

[llimllib]

I'd also like this; here's a chart I generated where the X axis label is unpleasantely close to the right margin:

(Probably axis titles should respect the graph margin? But I could also fix it manually if I could tweak its horizontal offset. Also the axis label doesn't have any useful class or property that would let me select it cleanly so I could push it over as a post-processing step)

[mbostock]

Related #375.