[Vega-Lite] 3.1 HTML setup
This example demonstrates a scatter plot of penguin culmen length versus culmen depth, rendered as circular marks using concrete measurements from the Palmer Penguins dataset. The page loads Vega-Lite 5 and Vega-Embed 6 from a CDN in a minimal HTML document, then calls `vegaEmbed('#vis', spec)` to parse the external `line.json` specification and inject the chart into a div. The Vega-Lite spec defines quantitative x- and y-encodings with a fixed width of 360 pixels, relying on Vega’s rendering pipeline to produce the visualization.