This example shows an interactive financial chart rendered with D3 and the d3fc library, displaying a line series that reflects external data. The visualization uses SVG for graphical output, incorporating a gradient fill beneath the chart area for visual emphasis. Its interactive features are built directly into the code, which leverages D3’s v5 API alongside d3fc’s components for charting functionality. The page also relies on babel-standalone to enable modern JavaScript syntax within the script tags, ensuring the custom chart elements and event handling execute properly in the browser.