This interactive chart displays a simple empty plot with labeled X and Y axes, rendered using D3 version 7. As the user moves the mouse over the inner gray rectangle, dashed crosshair lines extend from the cursor position to both axes, with small solid tick marks and numeric labels showing the current coordinate values. The implementation uses D3's `scaleLinear` for axis mapping, `axisBottom` and `axisLeft` for the axes, and the `pointer` method to track mouse position. A `ResizeObserver` monitors the container size, and hover state updates trigger redraws of the crosshair lines and value labels.