This example shows a time-series line graph of stock closing prices, with each data point rendered as a circle that displays a persistent tooltip on mouseover. Each tooltip contains the date, the closing value, and a hyperlink to a related D3 block, making the linked resources directly accessible from the visualization. The implementation uses D3 v6 with SVG rendering and animation. It parses dates with `d3.timeParse`, scales the data with `d3.scaleTime` and `d3.scaleLinear`, and draws the line with `d3.line`. Circles trigger tooltip transitions that open the embedded URLs in new tabs.