This example displays a trapezoid chart that visualizes year-over-year comparisons of prior, actual, and expected values. Users can randomize the underlying data or toggle between showing raw values and variance-only differences from the expected baseline. The visualization uses D3.js v3 with SVG paths to draw trapezoids with linear interpolation, transitioning smoothly over 1000 milliseconds via D3’s transition method. Axis scales are ordinal for years and linear for values, adapting their domains based on the toggle state.