Function extendElementWith

src/prototype/dom/dom.js:3213–3219

(element, methods)

   checkElementPrototypeDeficiency('object');

  function extendElementWith(element, methods) {
    for (var property in methods) {
      var value = methods[property];
      if (Object.isFunction(value) && !(property in element))
        element[property] = value.methodize();
    }
  }

  // Keeps track of the UIDs of extended elements.
  var EXTENDED = {};