This example displays a single black circle rendered inside an SVG element on a bare HTML page. It demonstrates the foundational structure of an SVG visualization using plain CSS and JavaScript without any external libraries. The circle is positioned at coordinates (50, 50) with a radius of 50, centered within the viewport. The styling applies a 13em font size to a `.message` class, though no text element uses it, highlighting the minimal setup for future React-based charting work.