This example demonstrates a graphing calculator that evaluates arithmetic expressions and plots custom polynomial functions. Users input equations with variables like "1p2" (representing 1x²) and click "graph_it" to render the curve. The calculator uses D3 v6 to append SVG path elements, while jQuery and jQuery UI handle user interactions such as button clicks and DOM manipulation. The code computes y-values across the viewport width and maps them to SVG coordinates for drawing.