A spinning wheel of 30 labeled slices presents trivia questions about CSS and HTML. Spinning the wheel selects a random slice, which displays a corresponding question in a separate panel. This example demonstrates fundamental D3.js v5 DOM manipulation and animation using SVG elements and transition methods. The code uses `d3.select`, `d3.append`, and `transition.attrTween` to rotate the wheel and update the displayed question based on the selected category.