This example displays the U.S. Federal Funds borrowing rate over time as a single steelblue line chart, with a focus on user interaction. Hovering the mouse over the plot reveals a small black circle and a text label that track the nearest data point, showing its date and rate value. The visualization uses d3.csv to load the dataset, d3.scaleTime and d3.scaleLinear for axes, and d3.line for the path. It also employs a d3.bisector to locate the closest data point, with SVG elements for rendering.