This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The r read-only property of the SVGCircleElement interface reflects the r attribute of a <circle> element and by that defines the radius of the circle.
If unspecified, the effect is as if the value is set to 0.
An SVGAnimatedLength representing the radius of the circle.
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" width="200" height="200"> <circle r="50" fill="gold" id="circle" /> </svg>
const circle = document.getElementById("circle");
console.log(circle.r);
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
r |
1 | 12 | 1.5 | ≤12.1 | 3 | 18 | 4 | ≤12.1 | 1 | 1.0 | 3 | 1 |
© 2005–2025 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/SVGCircleElement/r