This example demonstrates a basic SVG visualization using D3.js, drawing two circles and two rectangles on a canvas. The circles are positioned at different coordinates with a fixed radius, while the rectangles are placed at the same x and y positions but vary in height, with one using a value from the `myData` array. The code imports `select` from D3 to append elements, and additionally uses native `querySelectorAll` to log the rectangle elements to the console. Styling is applied via CSS, with red circles and minimal body margins.