This example shows a small scatterplot of ages and lengths, plotting four data points on a dark slate background. The visualization uses a linear x-scale for the length axis and a linear y-scale for ages, with square gold rectangles marking each point and axis titles labeling the dimensions. Rendered as SVG, the code uses D3 v6 methods such as `select` and `append` to build the chart, along with `scaleLinear` and `axisBottom`/`axisLeft` to generate the scales and ticks. The static dataset is defined in the script, and the page fills the entire browser viewport.