Here you can find the source of toggleDisplay()
Element.prototype.toggleDisplay = function() { if (this.style.display != "") this.style.display = ""; else/*w w w.j a va2s . c om*/ this.style.display = "none"; }
Element.prototype.toggleAttribute = function(name, value = "") { if ( this.hasAttribute(name) ) { this.removeAttribute(name); else { this.setAttribute(name, value); String.prototype.ucFirst = function() { ...
HTMLElement.prototype.toggle = function toggle() { this.style.visibility = (this.style.visibility === "hidden") ? "visible" : "hidden"; };