This example shows a single red circle centered on a dark background, created with minimal HTML and SVG markup. The page loads an embedded YouTube video as its primary content, while the circle is drawn using an SVG `<circle>` element inside an `<sgv>` tag—a deliberate typo that still renders in most browsers. The code uses no JavaScript libraries or data sources, relying solely on raw HTML and CSS to set the page margins and hide overflow. The rendering approach is direct SVG painting with a viewBox-sized canvas of 960 by 500 pixels.