CharacterData
We now ensure that `Node::is_character_data()` returns true for all nodes of type character data. Previously, calling `Node::length()` on `CDataSection` or `ProcessingInstruction` nodes would return an incorrect value.
document.createElementNS()
document.getElementById("")
document.getElementsByClassName("")
document.getElementsByName("")
Node.isDefaultNamespace()
Node.isEqualNode
Node.lookupNamespaceURI()
Node.normalize()