This example demonstrates basic SVG shape styling and interactivity through two circles rendered directly in an HTML document. The first circle uses static attributes for fill, stroke, and stroke-width, while the second employs a CSS class with a hover effect that transitions its fill color and adds a stroke over 300 milliseconds. The code uses plain SVG elements, CSS transitions, and inline JavaScript-free markup within a React-free environment, with the SVG canvas placed directly in the body alongside text.