Five rectangles are displayed in an SVG canvas. The rectangles are initially unstyled, and user interaction changes their fill color: clicking turns a rectangle orange, mouseover turns it green, and mouseenter turns it white. The code uses D3 v7's `selectAll` and `select` functions to bind event listeners and set attributes like width, height, x, and y. Positioning is computed with a conditional expression that alternates the horizontal offset based on each rectangle's index.