This example presents a stacked horizontal bar chart visualizing mobile brand sales across four quarters. The data is loaded from a CSV file, and each brand’s quarterly sales are stacked to show total price contributions. The chart is rendered as an SVG using D3 v7, with axes, a title, and a color-coded legend. Hovering over a bar segment triggers a tooltip displaying the brand and its specific sales value. The visualization employs D3’s scaleBand, scaleLinear, stack, and axis functions to construct the layout and interactions.