Implement HTMLScriptElement.prototype.text using _childNodes
Implement HTMLTableElement.prototype.insertRow using _childNodes.length
Intialize HTMLStyleElement using _childNodes
Implement core.Node.prototype.textContent using _childNodes
Implement Node.prototype.isEqualNode using _childNodes
Implement Node.prototype.compareDocumentPosition using _childNodes
Implement Element.prototype.innerHTML using _childNodes
Use lastIndexOf instead of indexOf in Node.prototype.removeChild

The fastest method to remove all children of an element is to loop through all its childNodes in reverse,
because this avoids renumbering the array.
Using lastIndexOf makes this removing all children slightly faster: O(n) instead of O(n^2)
Implement Attr.prototype.nodeValue using _childNodes