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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/SVGCircleElement below:

SVGCircleElement - Web APIs | MDN

Baseline Widely available

This interface also inherits properties from its parent, SVGGeometryElement.

SVGCircleElement.cx Read only

This property defines the x-coordinate of the center of the <circle> element. It is denoted by the cx attribute of the element.

SVGCircleElement.cy Read only

This property defines the y-coordinate of the center of the <circle> element. It is denoted by the cy attribute of the element.

SVGCircleElement.r Read only

This property defines the radius of the <circle> element. It is denoted by the r of the element.

Inherits methods from its parent interface, SVGGeometryElement.

In this example we draw a circle and randomly increase or decrease its radius when you click it.

<svg
  xmlns="http://www.w3.org/2000/svg"
  viewBox="0 0 250 250"
  width="250"
  height="250">
  <circle cx="100" cy="100" r="50" fill="gold" id="circle" />
</svg>

const circle = document.getElementById("circle");

function clickCircle() {
  // Randomly determine if the circle radius will increase or decrease
  const change = Math.random() > 0.5 ? 10 : -10;
  // Clamp the circle radius to a minimum of 10 and a maximum of 250,
  // so it won't disappear or get bigger than the viewport
  const newValue = Math.min(Math.max(circle.r.baseVal.value + change, 10), 250);
  circle.setAttribute("r", newValue);
}

circle.addEventListener("click", clickCircle);

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