This example demonstrates basic Scalable Vector Graphics (SVG) fundamentals by rendering a simple set of geometric primitives: a filled orange rectangle, an unfilled circle, and a blue diagonal line. The page structure uses plain HTML with inline SVG elements and a linked stylesheet for typography. The code directly employs SVG elements such as `rect`, `circle`, and `line` with specified coordinates and attributes, all within a fixed 1000 by 500 pixel viewport defined on the root `<svg>` element.