This line chart shows the daily closing price of the S&P 500 index over time, using a single temporal x-axis and quantitative y-axis. The visualization is built with Vega-Lite 5 and rendered via Vega-Embed, loading a CSV dataset from a GitHub gist. The chart is specified declaratively in a JSON file, with a fixed width of 360 pixels and a simple line mark. The code relies on Vega-Lite’s encoding system to map the date and price fields.