This example demonstrates basic SVG shapes created with D3.js and vanilla JavaScript, rendering two circles and three rectangles of varying heights on a blank canvas. The code uses D3’s `select` to append the shapes to an SVG element, with an array `myData` supplying rectangle heights. It also queries all `rect` elements via `document.querySelectorAll` and attaches a click handler that logs a message to the console. The page is styled with CSS, including a large centered greeting and red circles.