Offsets can cause axis labels to go offscreen.

[mbostock]

I think this might be related to #1, but we need to do some clamping or reconsider whether axis offsets apply to label anchors. Note the “V” is cut in half below:

Plot.Dot(AAPL, {
  x: {
    value: d => Math.abs(d.Close - d.Open) / d.Open * 100,
    label: "Daily change (%) →",
    format: "+f",
    rule: 0
  },
  y: {
    value: d => Math.log10(d.Volume),
    label: "↑ Volume (log₁₀)",
    offset: 12
  },
  grid: true
})