This example visualizes a simple dataset of four rectangular bars as a three-dimensional bar chart, with each bar’s height representing its value and the entire group tilted in perspective. The bars are drawn on an HTML canvas element using a 3D projection provided by the `d3._3d` API, which handles rotation and perspective scaling. The code relies on D3.js v7 for data binding and scale construction, while rendering is performed manually via Canvas 2D context methods like `beginPath` and `fill`, with the projection transforming each bar’s corners into 2D screen coordinates.