DOM Level 3 - slide "DOM Level 3 Core"

Tree normalization:
DOMConfiguration, and Document.normalizeDocument()
"cdata-sections", "entities", "namespaces", "validate", and "infoset".
Improving user manipulation:
Node.textContent, Node.setUserData(), Document.compareDocumentPosition(), Document.renameNode()
Bootstrapping a DOM implementation:
getDOMImplementation("Core 3.0 MutationEvents XPath")