This example shows a simple bar chart visualizing an array of nine numeric values as blue rectangles with value labels above each bar. The chart includes axes on the left and bottom. It uses D3 v5 with SVG rendering in a React-friendly HTML setup, employing `d3.scaleBand` for the x-axis, `d3.scaleLinear` for the y-axis, and `d3.axisBottom` and `d3.axisLeft` to generate the ticks. Bars are appended via data joins, with custom margins and padding.