This chart shows the change in petrol prices across Indian election years from 2004 to 2018, overlaid as both a red line and bars on the same axes. The visualization combines a line series with a bar series using dimple.js, built on top of d3.v4, with data loaded from a CSV file via `d3.csv`. The SVG chart is rendered with a fixed width and height, and the red line color is assigned both through the chart’s `assignColor` method and a CSS class selector.