This example shows a bar chart where each bar represents the cumulative running total of data points per year, with the height of each bar fixed at 300 pixels. The visualization uses D3.js, specifically the `select`, `csv`, and `data` methods to load the `data.csv` file and append rectangles to an SVG. The code binds the parsed numeric `running_total` values to `rect` elements but does not encode the values in the bar sizes, leaving all bars equal in height.