Not documented.
Source
@DomName('Document.createElementNS')
@DocsEditable()
Element createElementNS(String namespaceURI, String qualifiedName, [String typeExtension]) {
var newElement = (typeExtension == null) ?
_blink.BlinkDocument.instance.createElementNS_Callback_2_(unwrap_jso(this), namespaceURI, qualifiedName) :
_blink.BlinkDocument.instance.createElementNS_Callback_3_(unwrap_jso(this), namespaceURI, qualifiedName, typeExtension);
var wrapped;
if (newElement['dart_class'] != null) {
wrapped = newElement['dart_class']; // Here's our Dart class.
wrapped.blink_jsObject = newElement;
} else {
wrapped = wrap_jso(newElement);
if (wrapped == null) {
wrapped = wrap_jso_custom_element(newElement);
} else {
wrapped.blink_jsObject['dart_class'] = wrapped;
}
}
return wrapped;
}