Event.target is SVGElementInstance

[mems]

From SVG 1.1 specs event.target refer to the instance in the shadow tree. In SVG 2.0 it refer to the SVGUseElement

• Edge 12-15: SVG 1.1
• IE 8-11: SVG 1.1
• Firefox: SVG 2.0
• Chrome: SVG 2.0

Polyfill:

// Polyfill for IE10+ and Edge
if (window.SVGElementInstance) {
	// There is a false positive for Firefox where SVGElementInstance exist, but not used for event.target
	var desc = Object.getOwnPropertyDescriptor(Event.prototype, "target");// some browsers (Android stock browser) return null for property descriptor of Event.prototype.target. Use non-standard property Event.prototype.srcElement instead
	Object.defineProperty(Event.prototype, "target", {
		configurable: true,
		get: desc ? function() {
			var target = desc.get.call(this);
			return target && target.correspondingUseElement || target;
		} : function() {
			var target = this.srcElement;
			return target && target.correspondingUseElement || target;
		}
	});
}

Or use event.target.correspondingUseElement instead of just event.target

• No direct link to event target when SVG <use> is used - Microsoft Edge Development
• https://chromium.googlesource.com/chromium/blink.git/+/2b7c1a912916f9dc3b83b1d84cbcce477b0e931a/LayoutTests/svg/custom/use-instanceRoot-as-event-target.xhtml
• https://bugs.jquery.com/ticket/13180 and delegated Mouse Event targeted on SVG <use> element are not caught jquery/jquery#3877 (comment)
• https://groups.google.com/a/chromium.org/forum/#!topic/chromium-bugs/AeSY6qzKm4E
• SVGElementInstance object (Internet Explorer)
• 265895 - Support SVGElementInstance event delivery for <svg:use>