This example demonstrates zooming and panning on a two-dimensional Cartesian plane using D3’s `d3.behavior.zoom` with linear `x` and `y` scales. Dragging the mouse pans the view, while the mouse wheel zooms, with the scale extent limited to 1–32×. The code renders an SVG with a light gray background, a bottom x-axis with full-height tick lines, and a left y-axis with five ticks; during zoom events, the `zoomed` handler updates the x-axis only. It builds on D3 v3 and uses SVG elements for all graphics. No data is loaded; the chart shows an empty coordinate system.