This line chart tracks the monthly popularity of JavaScript, C#, and TypeScript from 2004 to 2021. The visualization uses Vega-Lite's grammar of graphics through the `vega-lite-api` library, encoding time on the x-axis, count on the y-axis, and technology as a color-coded series. Data is loaded from a local CSV string using `d3.csvParse`. The chart is rendered as an SVG with a custom dark color scheme for axis labels and titles, configured through Vega-Lite's configuration API. Tooltips are enabled via the `vega-tooltip` Handler.