This example shows online sales revenue over time as a line chart, with the x-axis representing years and the y-axis representing total revenue. It uses D3 v5 to load CSV data, parse dates with `d3.timeParse`, and render the visualization in SVG. The code employs `scaleTime`, `scaleLinear`, `axisBottom`, `axisLeft`, and `line` generators to construct the chart, with gridlines styled via tick marks and a styled purple stroke for the data path.