A plotly.js indicator trace with a gauge,
auto-detected by MAIDR. A gauge's number means nothing on its own: "73"
is not the reading, "73 out of 100, 7 below target, in the 'ok' band" is,
and a sighted reader gets all of it from the dial's geometry. So the
announcement carries the range, the target and the band alongside the
value. Plotly's steps carry no name of their own, so the bands are read
out only when the chart names them — as this one does.