beginning of D3
A simple SVG canvas displays a single large yellow circle with a black outline, centered on a 900-by-900 viewport. The example demonstrates the most basic use of the Scalable Vector Graphics (SVG) API, with geometric attributes such as `cx`, `cy`, `r`, `fill`, `stroke`, and `stroke-width` set directly in the markup. The accompanying HTML page contains no JavaScript or D3 library references, relying entirely on static SVG syntax. This minimal composition serves as a starting point for learning graphical primitives before introducing dynamic data visualizations.