This example visualizes Fitbit activity data as a scatterplot, with each circle representing an activity record. The x-axis plots the date and the y-axis plots activity type, while color distinguishes the data’s origin and tooltips reveal the activity name. Built with the Vega-Lite API, it loads CSV data via d3.csv from a GitHub repository and configures axis styling and tooltip handlers through vega-tooltip, rendering as SVG with automatic sizing to fit the viewport.