Three concentric circular target patterns are drawn on a dark canvas, each composed of nested gray-scale ellipses that create a stepped gradient effect. The example demonstrates the P5.js `setup()` and `draw()` functions, with a custom `drawTarget()` function that generates each target using a loop and the `fill()` and `ellipse()` methods. It uses the P5.js library (version 0.6.0) loaded via a CDN link, and the canvas is sized to the browser window dimensions.