The ownerSVGElement property of the SVGElement interface reflects the nearest ancestor <svg> element. null if the given element is the outermost <svg> element.
An SVGSVGElement.
<svg> element<svg id="outerSvg" xmlns="http://www.w3.org/2000/svg">
<g id="group1">
<circle id="circle1" cx="50" cy="50" r="40" fill="blue" />
</g>
</svg>const circle = document.getElementById("circle1");
const ownerSVG = circle.ownerSVGElement;
if (ownerSVG) {
console.log(`The circle's owner <svg> has the ID: ${ownerSVG.id}`);
} else {
console.log("This element is the outermost <svg>.");
}