SVG Basics
This example uses raw SVG elements to demonstrate basic shape rendering in a web page. It draws two circles and a rectangle, each with explicit fill colors and stroke properties set via SVG attributes. The code relies on native SVG markup within an HTML document, showing how circles use `cx`, `cy`, and `r` attributes while rectangles use `x`, `y`, `width`, and `height`. No external JavaScript libraries are used; the visualization is purely declarative SVG.