This example shows a simple line chart of four data points using D3.js. The chart maps time to value, with an SVG path drawn in steel blue to connect the points. The code explicitly sets up linear scales for both axes, uses `d3.axisBottom` and `d3.axisLeft` to render tick marks, and creates the line with `d3.line()`. The data is hardcoded as an array of objects, and the visualization is rendered as SVG inside a dedicated container, following the classic margin convention for layout.