I'd like to request an official WebKit position on updating Node.lookupNamespaceURI() [1] so that it returns the XML namespace URI for "xml" prefix by default. It would simplify the implementation of XPathEvaluator.createNSResolver() significantly, and Firefox already supports this behavior. [2] This is a RFP to change the DOM specification. [1] https://dom.spec.whatwg.org/#dom-node-lookupnamespaceuri [2] https://github.com/whatwg/dom/issues/857 -- TAMURA Kent Software Engineer, Google