This example demonstrates how a D3 linear scale maps an input value to an output range, using a simple numeric conversion from 0–100 to 0–500. The visualization outputs the mapped value for an input of 50, displaying 250 directly on the page. The code defines the scale with `d3.scaleLinear()`, setting its domain and range, then calls the scale function to compute the result. It relies on D3 v7 loaded from a CDN and renders the numeric output through `document.write` in the browser.