This example embeds a single Observable notebook cell that displays a live numeric value: the number of seconds since the page loaded, updated continuously in real time. The visualization is rendered inside a plain HTML page by importing the Observable Runtime from a CDN and loading the notebook definition from Observable’s API. The code uses `Runtime`, `Inspector.into`, and the notebook’s exported `secondsSinceLoadingThisPage` variable to drive the display, with no additional charting library involved.