A single orange-to-green bar visualizes a numeric score of 79 on a fixed 0-to-100 scale. The bar’s width and fill color both derive from the same data value using `d3.scaleLinear` for the x-position and color ranges. Rendered as an SVG rectangle with a black stroke, the chart updates automatically when the data array changes. The example uses D3 v6 to append the SVG and bind the data to the rectangle element.