JSFiddle - React, Tailwind, and code Playground

HTML

<svg width="100" height="100">
    <circle cx="50" cy="50" r="40" focusable="true" onclick="alert(this.focusable)" />
</svg>

JavaScript

Object.defineProperty(SVGElement.prototype, "focusable", {
    configurable : false,
    enumerable   : false,

    get: function focusable() {
        alert("get");
        return "Yeah";
    },

    set: function focusable(val) {
        alert("set");
        return "Ok";
    }
});