This visualization demonstrates hover interaction on a chart with labeled axes. Moving the cursor inside the gray plot area draws black crosshair lines from the pointer to the x and y axes, using the D3 `pointer` event and state management. The plot uses `d3.scaleLinear` for both axes, with `axisBottom` and `axisLeft` rendering ticks. The code relies on D3’s select/join pattern to update the SVG elements dynamically as the mouse position changes.