my-element.html

<script>
(function() {
    // Creates an object based in the HTML Element prototype
    var element = Object.create(HTMLElement.prototype);

    // Fires when an instance of the element is created
    element.createdCallback = function() {};

    // Fires when an instance was inserted into the document
    element.attachedCallback = function() {};

    // Fires when an instance was removed from the document
    element.detachedCallback = function() {};

    // Fires when an attribute was added, removed, or updated
    element.attributeChangedCallback = function(attr, oldVal, newVal) {};

    // Registers custom element
    document.registerElement('my-element', {
        prototype: element
    });
}());
</script>