This example visualizes weekly U.S. gasoline prices as a line chart, with time on the x-axis and price per gallon on the y-axis, emphasizing trends through a simplified, clean design. It uses the Vega-Lite API to construct the chart declaratively, registering it with Vega and Vega-Lite, while D3’s `csv` module is referenced for potential data loading. The data, a static array of timestamped prices, is passed directly to the chart, which renders as a full-window SVG. Custom axis styling and large label fonts are configured to improve readability.