What's wrong is what the DOM is and what it isn't. The DOM is the Document Object Model data structure along with the parametrized routines that operate on that

What's wrong is what the DOM is and what it isn't. The DOM is the Document Object Model data structure along with the parametrized routines that operate on that data structure. It exposes every way in which the apparent simplicity of XML is far from the reality. Then the operations that it provides do little to manage the complexity. They are only relatively "primitive" operations, like getters and setters for the data structure, plus a few things like "getElementsByTagName". That gets a set of elements from which you then should or must exclude what you don't want. If you want a convenient wrapper for the DOM API, you have to find or build one.