This example demonstrates a simple interactive web page where clicking a large “click me” heading appends a red “wassup” message to the body. The code uses D3 v6 selections (d3.select, d3.selectAll) to bind data arrays and append SVG rects, though the rect-drawing logic is commented out. The SVG remains empty, while the primary interaction relies on d3.select('h1').on('click') to trigger DOM insertion, rendering entirely through SVG and HTML elements in the browser.