This example demonstrates the role of margins in defining the plotting area. A blue rectangle is drawn as the inner region, with axes positioned along its bottom and left edges. The code uses D3’s `scaleLinear` to map data values to pixel coordinates, and `axisBottom` and `axisLeft` to render the tick marks and labels. The visualization is created with an SVG container, where the rectangle’s dimensions and axis placements are computed from the margin values.