This scatterplot shows the relationship between employee age and daily rate, with points colored by education level. The visualization uses a plain point mark with reduced opacity to reveal overlapping data density, and disables the axis domain lines for a cleaner appearance. It loads HR data from a CSV file using D3’s `csv` function, and builds the chart declaratively through the `vega-lite-api`, registering it with `vega` and `vega-lite`. Tooltips are enabled via `vega-tooltip`’s `Handler`, and the chart resizes to fit the window with a custom dark-themed configuration.