Colours, never hue alone

• The figure--color-chart-actual
• The forecast or the target--color-chart-forecast
• The empty part of a bar--color-chart-track

The categories of the domain, each with its word and icon beside the colour:

Against a target: green on target, amber within 10%, red more than 10% below (S-03 CORE-10b), always with its icon and word:

Axes and legend

• The unit stands on the axis or in the title: £, %, points, Sites.
• A bar starts at zero; the zero line is drawn stronger than the grid.
• Four to eight ticks, in round steps; money short on the axis (£2m), in full on the label.
• Labels stand on the marks where they fit; a legend only where they do not, each colour with its word.
• A target, a budget or a band is a line or a zone with its name on it.

Tooltip, by mouse and keyboard

• It shows the mark’s name, its figure with the unit and the records it counts.
• Tab moves from mark to mark; the tooltip opens on focus as on hover, Escape closes it.
• It never holds the only way to learn a figure: every figure is also on the chart or in its table.

Loading, empty, and reduced motion

• When a chart first shows, its bars grow from zero in the slow duration; with reduced motion they stand finished. A figure never counts up.