<svg xmlns="http://www.w3.org/2000/svg" xmlns:html="http://www.w3.org/1999/xhtml">
  <title>A negative value for ry is invalid; ry computes to auto and the used radius mirrors rx</title>
  <html:link rel="help" href="https://w3c.github.io/svgwg/svg2-draft/geometry.html#RY"/>
  <html:link rel="match"  href="circle-ref.svg" />
  <ellipse cx="204" cy="56" rx="65" ry="-65" fill="blue"/>
</svg>