src/dual-listbox.js
/**
     * @Private
     * Returns true if argument is a DOM element
     */
@Private
Returns true if argument is a DOM element
@Private Returns true if argument is a DOM element
static isDomElement(o) {
        return typeof HTMLElement === "object"
            ? o instanceof HTMLElement 
            : o &&
                  typeof o === "object" &&
                  o !== null &&
                  o.nodeType === 1 &&
                  typeof o.nodeName === "string";
    }
static isDomElement ( o ) { return typeof HTMLElement === "object" ? o instanceof HTMLElement : o && typeof o === "object" && o !== null && o . nodeType === 1 && typeof o . nodeName === "string" ; }
@Private
 Returns true if argument is a DOM element
@Private Returns true if argument is a DOM element
//DOM2