This example shows a timeline of page visits, with a line mark for each session plotted against timestamps on the x-axis and page names on the y-axis, colored by session ID. The visualization is built using the Vega-Lite API, which registers Vega and Vega-Lite libraries, and loads data from a CSV file via d3.csv. It renders as an SVG that fits the window, using custom axis and label styling from a config object, with Vega Tooltip enabled for interactivity.