<?xml version="1.0" encoding="UTF-8"?> <svg xmlns="http://www.w3.org/2000/svg" width="100" height="100"> <metadata> <link xmlns="http://www.w3.org/1999/xhtml" rel="help" href="https://www.w3.org/TR/SVG2/shapes.html#CircleElement"/> <link xmlns="http://www.w3.org/1999/xhtml" rel="match" href="circle-01-ref.svg"/> <meta xmlns="http://www.w3.org/1999/xhtml" name="assert" content="r 0 disables rendering."/> </metadata> <circle cx="50" cy="50" r="0" fill="red" stroke="red" stroke-width="5"/> </svg>