/**
* wrap this Element with another Element.
* Note: this Element must be already in the DOM.
*
* @example
*
* let anchor = `<a id="${anchorID}"></a>`.htmlToElement();
* let heading = document.querySelector("h2");
* heading.wrappedWith(anchor);
*/
Element.prototype.wrappedWith = function(elem){
this.before(elem); // insert element before self
elem.append(this); // move self into element ⭐
};