SVGEllipseElement

  <div id="interfaceDiagram" style="display: inline-block; position: relative; width: 100%; padding-bottom: 23.333333333333332%; vertical-align: middle; overflow: hidden;"><svg style="display: inline-block; position: absolute; top: 0; left: 0;" viewbox="-50 0 600 140" preserveAspectRatio="xMinYMin meet"><a xlink:href="/docs/Web/API/EventTarget" target="_top"><rect x="1" y="1" width="110" height="50" fill="#fff" stroke="#D4DDE4" stroke-width="2px" /><text  x="56" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">EventTarget</text></a><polyline points="111,25  121,20  121,30  111,25" stroke="#D4DDE4" fill="none"/><line x1="121" y1="25" x2="151" y2="25" stroke="#D4DDE4"/><a xlink:href="/docs/Web/API/Node" target="_top"><rect x="151" y="1" width="75" height="50" fill="#fff" stroke="#D4DDE4" stroke-width="2px" /><text  x="188.5" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">Node</text></a><polyline points="226,25  236,20  236,30  226,25" stroke="#D4DDE4" fill="none"/><line x1="236" y1="25" x2="266" y2="25" stroke="#D4DDE4"/><a xlink:href="/docs/Web/API/Element" target="_top"><rect x="266" y="1" width="75" height="50" fill="#fff" stroke="#D4DDE4" stroke-width="2px" /><text  x="303.5" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">Element</text></a><polyline points="341,25  351,20  351,30  341,25" stroke="#D4DDE4" fill="none"/><line x1="351" y1="25" x2="381" y2="25" stroke="#D4DDE4"/><a xlink:href="/docs/Web/API/SVGElement" target="_top"><rect x="381" y="1" width="100" height="50" fill="#fff" stroke="#D4DDE4" stroke-width="2px" /><text  x="431" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">SVGElement</text></a><polyline points="481,25  491,20  491,30  481,25" stroke="#D4DDE4" fill="none"/><line x1="491" y1="25" x2="499" y2="25" stroke="#D4DDE4"/><line x1="499" y1="25" x2="499" y2="90" stroke="#D4DDE4"/><line x1="499" y1="90" x2="482" y2="90" stroke="#D4DDE4"/><a xlink:href="/docs/Web/API/SVGGraphicsElement" target="_top"><rect x="301" y="65" width="180" height="50" fill="#fff" stroke="#D4DDE4" stroke-width="2px" /><text  x="391" y="94" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">SVGGraphicsElement</text></a><polyline points="301,89  291,84  291,94  301,89" stroke="#D4DDE4" fill="none"/><line x1="291" y1="89" x2="261" y2="89" stroke="#D4DDE4"/><a xlink:href="/docs/Web/API/SVGGeometryElement" target="_top"><rect x="81" y="65" width="180" height="50" fill="#fff" stroke="#D4DDE4" stroke-width="2px" /><text  x="171" y="94" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">SVGGeometryElement</text></a><polyline points="81,89  71,84  71,94  81,89" stroke="#D4DDE4" fill="none"/><line x1="71" y1="89" x2="41" y2="89" stroke="#D4DDE4"/><a xlink:href="/docs/Web/API/SVGEllipseElement" target="_top"><rect x="-129" y="65" width="170" height="50" fill="#F4F7F8" stroke="#D4DDE4" stroke-width="2px" /><text  x="-44" y="94" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">SVGEllipseElement</text></a></svg></div>

  a:hover text { fill: #0095DD; pointer-events: all;}

<svg width="200" height="200" xmlns="http://www.w3.org/2000/svg">
  <ellipse cx="100" cy="100" rx="100" ry="60" id="ellipse"
      onclick="outputSize();"/>
</svg>

function outputSize() {
  var ellipse = document.getElementById("ellipse");

  // Outputs "horizontal radius: 100 vertical radius: 60"
  console.log(
    'horizontal radius: ' + ellipse.rx.baseVal.valueAsString,
    'vertical radius: ' + ellipse.ry.baseVal.valueAsString
  )
}

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.