auto merge of #2101 : jdm/servo/newroot_rebase, r=Ms2ger

As described in #1764, this strategy uses the following properties:
* DOM members are `JS<T>` types. These cannot be used with being explicitly rooted, but they are required for compiler-derived trace hooks.
* Methods that take DOM type arguments receive `&[mut] JSRef<T>`. These are rooted value references that are cloneable but cannot escape.
* Methods that return DOM values use `Unrooted<T>`. These are values that may or may not be rooted elsewhere, but callers must root them in order to interact with them in any way. One unsoundness hole exists - `Unrooted` values must be rooted ASAP, or there exists the danger that JSAPI calls could be made that could cause the underlying JS value to be GCed.
* All methods are implemented on `JSRef<T>`, enforcing the requirement that all DOM values are rooted for the duration of a method call (with a few exceptions for layout-related code, which cannot root values and therefore interacts with `JS<T>` and `&T` values - this is safe under the assumption that layout code interacts with DOM nodes that are in the tree, therefore rooted, and does not run concurrently with content code)

configure

@@ -697,6 +697,7 @@ do
                 CONFIGURE_ARGS="${CONFIGURE_ARGS} --with-android-ndk=${CFG_ANDROID_NDK_PATH}"
                 CONFIGURE_ARGS="${CONFIGURE_ARGS} --with-android-toolchain=${CFG_ANDROID_CROSS_PATH}"
             fi
+            CONFIGURE_ARGS="${CONFIGURE_ARGS} --enable-gczeal"
             ;;
         support/skia/skia)
             # Right now the skia configure script actually ignores --enable-debug and the

src/components/main/layout/construct.rs

@@ -45,7 +45,6 @@ use layout::wrapper::{Before, BeforeBlock, After, AfterBlock, Normal};
 
 use gfx::display_list::OpaqueNode;
 use gfx::font_context::FontContext;
-use script::dom::bindings::codegen::InheritTypes::TextCast;
 use script::dom::bindings::js::JS;
 use script::dom::element::{HTMLIFrameElementTypeId, HTMLImageElementTypeId};
 use script::dom::element::{HTMLObjectElementTypeId};
@@ -1064,8 +1063,8 @@ impl<'ln> NodeUtils for ThreadSafeLayoutNode<'ln> {
         match self.type_id() {
             Some(TextNodeTypeId) => {
                 unsafe {
-                    let text: JS<Text> = TextCast::to(self.get_jsmanaged()).unwrap();
-                    if !is_whitespace(text.get().characterdata.data) {
+                    let text: JS<Text> = self.get_jsmanaged().transmute_copy();
+                    if !is_whitespace((*text.unsafe_get()).characterdata.data) {
                         return false
                     }
 

src/components/main/layout/wrapper.rs

@@ -37,10 +37,11 @@ use script::dom::bindings::codegen::InheritTypes::{HTMLIFrameElementDerived};
 use script::dom::bindings::codegen::InheritTypes::{HTMLImageElementDerived, TextDerived};
 use script::dom::bindings::js::JS;
 use script::dom::element::{Element, HTMLAreaElementTypeId, HTMLAnchorElementTypeId};
-use script::dom::element::{HTMLLinkElementTypeId};
+use script::dom::element::{HTMLLinkElementTypeId, LayoutElementHelpers, RawLayoutElementHelpers};
 use script::dom::htmliframeelement::HTMLIFrameElement;
-use script::dom::htmlimageelement::HTMLImageElement;
-use script::dom::node::{DocumentNodeTypeId, ElementNodeTypeId, Node, NodeTypeId, NodeHelpers};
+use script::dom::htmlimageelement::{HTMLImageElement, LayoutHTMLImageElementHelpers};
+use script::dom::node::{DocumentNodeTypeId, ElementNodeTypeId, Node, NodeTypeId};
+use script::dom::node::{LayoutNodeHelpers, RawLayoutNodeHelpers};
 use script::dom::text::Text;
 use servo_msg::constellation_msg::{PipelineId, SubpageId};
 use servo_util::namespace;
@@ -95,7 +96,7 @@ pub trait TLayoutNode {
                 fail!("not an image!")
             }
             let image_element: JS<HTMLImageElement> = self.get_jsmanaged().transmute_copy();
-            (*image_element.unsafe_get()).image().as_ref().map(|url| (*url).clone())
+            image_element.image().as_ref().map(|url| (*url).clone())
         }
     }
 
@@ -163,7 +164,9 @@ impl<'ln> TLayoutNode for LayoutNode<'ln> {
     }
 
     fn type_id(&self) -> Option<NodeTypeId> {
-        Some(self.node.type_id())
+        unsafe {
+            Some(self.node.type_id_for_layout())
+        }
     }
 
     unsafe fn get_jsmanaged<'a>(&'a self) -> &'a JS<Node> {
@@ -172,7 +175,7 @@ impl<'ln> TLayoutNode for LayoutNode<'ln> {
 
     fn first_child(&self) -> Option<LayoutNode<'ln>> {
         unsafe {
-            self.get().first_child_ref().map(|node| self.new_with_this_lifetime(node))
+            self.get_jsmanaged().first_child_ref().map(|node| self.new_with_this_lifetime(node))
         }
     }
 
@@ -221,19 +224,19 @@ impl<'ln> LayoutNode<'ln> {
 impl<'ln> TNode<LayoutElement<'ln>> for LayoutNode<'ln> {
     fn parent_node(&self) -> Option<LayoutNode<'ln>> {
         unsafe {
-            self.get().parent_node_ref().map(|node| self.new_with_this_lifetime(node))
+            self.node.parent_node_ref().map(|node| self.new_with_this_lifetime(node))
         }
     }
 
     fn prev_sibling(&self) -> Option<LayoutNode<'ln>> {
         unsafe {
-            self.get().prev_sibling_ref().map(|node| self.new_with_this_lifetime(node))
+            self.node.prev_sibling_ref().map(|node| self.new_with_this_lifetime(node))
         }
     }
 
     fn next_sibling(&self) -> Option<LayoutNode<'ln>> {
         unsafe {
-            self.get().next_sibling_ref().map(|node| self.new_with_this_lifetime(node))
+            self.node.next_sibling_ref().map(|node| self.new_with_this_lifetime(node))
         }
     }
 
@@ -241,8 +244,9 @@ impl<'ln> TNode<LayoutElement<'ln>> for LayoutNode<'ln> {
     #[inline]
     fn as_element(&self) -> LayoutElement<'ln> {
         unsafe {
+            assert!(self.node.is_element_for_layout());
             let elem: JS<Element> = self.node.transmute_copy();
-            let element = elem.get();
+            let element = &*elem.unsafe_get();
             LayoutElement {
                 element: cast::transmute_region(element),
             }
@@ -258,9 +262,9 @@ impl<'ln> TNode<LayoutElement<'ln>> for LayoutNode<'ln> {
     }
 
     fn match_attr(&self, attr: &AttrSelector, test: |&str| -> bool) -> bool {
-        let element = self.as_element();
         let name = unsafe {
-            if element.element.html_element_in_html_document_for_layout() {
+            let element: JS<Element> = self.node.transmute_copy();
+            if element.html_element_in_html_document_for_layout() {
                 attr.lower_name.as_slice()
             } else {
                 attr.name.as_slice()
@@ -268,6 +272,7 @@ impl<'ln> TNode<LayoutElement<'ln>> for LayoutNode<'ln> {
         };
         match attr.namespace {
             SpecificNamespace(ref ns) => {
+                let element = self.as_element();
                 element.get_attr(ns, name)
                         .map_or(false, |attr| test(attr))
             },
@@ -459,7 +464,7 @@ impl<'ln> TLayoutNode for ThreadSafeLayoutNode<'ln> {
         }
 
         unsafe {
-            self.get().first_child_ref().map(|node| self.new_with_this_lifetime(node))
+            self.get_jsmanaged().first_child_ref().map(|node| self.new_with_this_lifetime(node))
         }
     }
 
@@ -509,10 +514,10 @@ impl<'ln> ThreadSafeLayoutNode<'ln> {
     /// Returns the next sibling of this node. Unsafe and private because this can lead to races.
     unsafe fn next_sibling(&self) -> Option<ThreadSafeLayoutNode<'ln>> {
         if self.pseudo == Before || self.pseudo == BeforeBlock {
-            return self.get().first_child_ref().map(|node| self.new_with_this_lifetime(node))
+            return self.get_jsmanaged().first_child_ref().map(|node| self.new_with_this_lifetime(node))
         }
 
-        self.node.get().next_sibling_ref().map(|node| self.new_with_this_lifetime(node))
+        self.get_jsmanaged().next_sibling_ref().map(|node| self.new_with_this_lifetime(node))
     }
 
     /// Returns an iterator over this node's children.
@@ -527,7 +532,8 @@ impl<'ln> ThreadSafeLayoutNode<'ln> {
     #[inline]
     pub fn as_element(&self) -> ThreadSafeLayoutElement {
         unsafe {
-            let elem: JS<Element> = self.node.get_jsmanaged().transmute_copy();
+            assert!(self.get_jsmanaged().is_element_for_layout());
+            let elem: JS<Element> = self.get_jsmanaged().transmute_copy();
             let element = elem.unsafe_get();
             // FIXME(pcwalton): Workaround until Rust gets multiple lifetime parameters on
             // implementations.

src/components/script/dom/attr.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::AttrBinding;
 use dom::bindings::codegen::InheritTypes::NodeCast;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Temporary};
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
 use dom::element::Element;
 use dom::node::Node;
@@ -45,7 +45,7 @@ impl Reflectable for Attr {
 impl Attr {
     fn new_inherited(local_name: DOMString, value: DOMString,
                      name: DOMString, namespace: Namespace,
-                     prefix: Option<DOMString>, owner: JS<Element>) -> Attr {
+                     prefix: Option<DOMString>, owner: &JSRef<Element>) -> Attr {
         Attr {
             reflector_: Reflector::new(),
             local_name: local_name,
@@ -53,25 +53,26 @@ impl Attr {
             name: name, //TODO: Intern attribute names
             namespace: namespace,
             prefix: prefix,
-            owner: owner,
+            owner: owner.unrooted(),
         }
     }
 
-    pub fn new(window: &JS<Window>, local_name: DOMString, value: DOMString,
+    pub fn new(window: &JSRef<Window>, local_name: DOMString, value: DOMString,
                name: DOMString, namespace: Namespace,
-               prefix: Option<DOMString>, owner: JS<Element>) -> JS<Attr> {
+               prefix: Option<DOMString>, owner: &JSRef<Element>) -> Temporary<Attr> {
         let attr = Attr::new_inherited(local_name, value, name, namespace, prefix, owner);
         reflect_dom_object(~attr, window, AttrBinding::Wrap)
     }
 
     pub fn set_value(&mut self, set_type: AttrSettingType, value: DOMString) {
-        let node: JS<Node> = NodeCast::from(&self.owner);
+        let mut owner = self.owner.root();
+        let node: &mut JSRef<Node> = NodeCast::from_mut_ref(&mut *owner);
         let namespace_is_null = self.namespace == namespace::Null;
 
         match set_type {
             ReplacedAttr => {
                 if namespace_is_null {
-                    vtable_for(&node).before_remove_attr(self.local_name.clone(), self.value.clone());
+                    vtable_for(node).before_remove_attr(self.local_name.clone(), self.value.clone());
                 }
             }
             FirstSetAttr => {}
@@ -80,7 +81,7 @@ impl Attr {
         self.value = value;
 
         if namespace_is_null {
-            vtable_for(&node).after_set_attr(self.local_name.clone(), self.value.clone());
+            vtable_for(node).after_set_attr(self.local_name.clone(), self.value.clone());
         }
     }
 
@@ -89,31 +90,40 @@ impl Attr {
     }
 }
 
-impl Attr {
-    pub fn LocalName(&self) -> DOMString {
+pub trait AttrMethods {
+    fn LocalName(&self) -> DOMString;
+    fn Value(&self) -> DOMString;
+    fn SetValue(&mut self, value: DOMString);
+    fn Name(&self) -> DOMString;
+    fn GetNamespaceURI(&self) -> Option<DOMString>;
+    fn GetPrefix(&self) -> Option<DOMString>;
+}
+
+impl<'a> AttrMethods for JSRef<'a, Attr> {
+    fn LocalName(&self) -> DOMString {
         self.local_name.clone()
     }
 
-    pub fn Value(&self) -> DOMString {
+    fn Value(&self) -> DOMString {
         self.value.clone()
     }
 
-    pub fn SetValue(&mut self, value: DOMString) {
+    fn SetValue(&mut self, value: DOMString) {
         self.set_value(ReplacedAttr, value);
     }
 
-    pub fn Name(&self) -> DOMString {
+    fn Name(&self) -> DOMString {
         self.name.clone()
     }
 
-    pub fn GetNamespaceURI(&self) -> Option<DOMString> {
+    fn GetNamespaceURI(&self) -> Option<DOMString> {
         match self.namespace.to_str() {
             "" => None,
             url => Some(url.to_owned()),
         }
     }
 
-    pub fn GetPrefix(&self) -> Option<DOMString> {
+    fn GetPrefix(&self) -> Option<DOMString> {
         self.prefix.clone()
     }
 }

src/components/script/dom/attrlist.rs

@@ -4,7 +4,7 @@
 
 use dom::attr::Attr;
 use dom::bindings::codegen::BindingDeclarations::AttrListBinding;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Temporary};
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
 use dom::element::Element;
 use dom::window::Window;
@@ -17,28 +17,36 @@ pub struct AttrList {
 }
 
 impl AttrList {
-    pub fn new_inherited(window: JS<Window>, elem: JS<Element>) -> AttrList {
+    pub fn new_inherited(window: &JSRef<Window>, elem: &JSRef<Element>) -> AttrList {
         AttrList {
             reflector_: Reflector::new(),
-            window: window,
-            owner: elem
+            window: window.unrooted(),
+            owner: elem.unrooted(),
         }
     }
 
-    pub fn new(window: &JS<Window>, elem: &JS<Element>) -> JS<AttrList> {
-        reflect_dom_object(~AttrList::new_inherited(window.clone(), elem.clone()),
+    pub fn new(window: &JSRef<Window>, elem: &JSRef<Element>) -> Temporary<AttrList> {
+        reflect_dom_object(~AttrList::new_inherited(window, elem),
                            window, AttrListBinding::Wrap)
     }
+}
 
-    pub fn Length(&self) -> u32 {
-        self.owner.get().attrs.len() as u32
+pub trait AttrListMethods {
+    fn Length(&self) -> u32;
+    fn Item(&self, index: u32) -> Option<Temporary<Attr>>;
+    fn IndexedGetter(&self, index: u32, found: &mut bool) -> Option<Temporary<Attr>>;
+}
+
+impl<'a> AttrListMethods for JSRef<'a, AttrList> {
+    fn Length(&self) -> u32 {
+        self.owner.root().attrs.len() as u32
     }
 
-    pub fn Item(&self, index: u32) -> Option<JS<Attr>> {
-        self.owner.get().attrs.as_slice().get(index as uint).map(|x| x.clone())
+    fn Item(&self, index: u32) -> Option<Temporary<Attr>> {
+        self.owner.root().attrs.as_slice().get(index as uint).map(|x| Temporary::new(x.clone()))
     }
 
-    pub fn IndexedGetter(&self, index: u32, found: &mut bool) -> Option<JS<Attr>> {
+    fn IndexedGetter(&self, index: u32, found: &mut bool) -> Option<Temporary<Attr>> {
         let item = self.Item(index);
         *found = item.is_some();
         item

src/components/script/dom/bindings/codegen/Bindings.conf

@@ -9,8 +9,6 @@
 # The configuration table maps each interface name to a |descriptor|.
 #
 # Valid fields for all descriptors:
-#   * needsAbstract: a list of members that require a JS<>-wrapped version of
-#     self to be passed to the native code.
 #   * createGlobal: True for global objects.
 #   * outerObjectHook: string to use in place of default value for outerObject and thisObject
 #                      JS class hooks
@@ -26,123 +24,44 @@ DOMInterfaces = {
 'ClientRect': {},
 'ClientRectList': {},
 'Console': {},
-'Document': {
-    'needsAbstract': [
-        'adoptNode',
-        'anchors',
-        'applets',
-        'body',
-        'children',
-        'createComment',
-        'createDocumentFragment',
-        'createElement',
-        'createElementNS',
-        'createProcessingInstruction',
-        'createTextNode',
-        'embeds',
-        'forms',
-        'getElementsByClassName',
-        'getElementsByTagName',
-        'getElementsByTagNameNS',
-        'images',
-        'importNode',
-        'links',
-        'location',
-        'plugins',
-        'scripts',
-        'title',
-    ],
-},
+'Document': {},
 'DOMException': {},
 'DOMImplementation': {},
 'DOMParser': {},
-'Element': {
-    'needsAbstract': [
-        'attributes',
-        'children',
-        'className',
-        'getAttribute',
-        'getAttributeNS',
-        'getBoundingClientRect',
-        'getClientRects',
-        'getElementsByClassName',
-        'getElementsByTagName',
-        'getElementsByTagNameNS',
-        'hasAttribute',
-        'hasAttributeNS',
-        'id',
-        'innerHTML',
-        'outerHTML',
-        'removeAttribute',
-        'removeAttributeNS',
-        'setAttribute',
-        'setAttributeNS',
-    ]
-},
+'Element': {},
 'Event': {},
 'EventListener': {
     'nativeType': 'EventListenerBinding::EventListener',
 },
-'EventTarget': {
-    'needsAbstract': ['dispatchEvent']
-},
+'EventTarget': {},
 'FormData': {},
 'HTMLCollection': {},
 'Location': {},
 'MouseEvent': {},
 'Navigator': {},
-'Node': {
-    'needsAbstract': [
-        'appendChild',
-        'childNodes',
-        'cloneNode',
-        'compareDocumentPosition',
-        'contains',
-        'insertBefore',
-        'isEqualNode',
-        'namespaceURI',
-        'nodeName',
-        'nodeValue',
-        'normalize',
-        'removeChild',
-        'replaceChild',
-        'textContent',
-    ]
-},
-
+'Node': {},
 'NodeList': {},
-
 'UIEvent': {},
 'ValidityState': {},
 'Window': {
     'createGlobal': True,
     'outerObjectHook': 'Some(bindings::utils::outerize_global)',
-    'needsAbstract': [
-        'console',
-        'location',
-        'navigator',
-        'self',
-        'window',
-    ],
 },
 'XMLHttpRequest': {},
 'XMLHttpRequestEventTarget': {},
 'XMLHttpRequestUpload': {},
 
+#FIXME(jdm): This should be 'register': False, but then we don't generate enum types
 'TestBinding': {},
 
 }
 
 # FIXME: This should be renamed: https://github.com/mozilla/servo/issues/1625
-def addHTMLElement(element, concrete=None, needsAbstract=[]):
-  DOMInterfaces[element] = {
-    'nativeType': 'JS<%s>' % element,
-    'concreteType': concrete if concrete else element,
-    'needsAbstract': needsAbstract
-  }
+def addHTMLElement(element):
+  DOMInterfaces[element] = {}
 
 addHTMLElement('Comment')
-addHTMLElement('DocumentFragment', concrete='DocumentFragment', needsAbstract=['children'])
+addHTMLElement('DocumentFragment')
 addHTMLElement('DocumentType')
 addHTMLElement('Text')
 addHTMLElement('ProcessingInstruction')
@@ -158,12 +77,12 @@ addHTMLElement('HTMLBRElement')
 addHTMLElement('HTMLCanvasElement')
 addHTMLElement('HTMLDataElement')
 addHTMLElement('HTMLDivElement')
-addHTMLElement('HTMLDataListElement', needsAbstract=['options'])
+addHTMLElement('HTMLDataListElement')
 addHTMLElement('HTMLDirectoryElement')
 addHTMLElement('HTMLDListElement')
 addHTMLElement('HTMLElement')
 addHTMLElement('HTMLEmbedElement')
-addHTMLElement('HTMLFieldSetElement', needsAbstract=['elements'])
+addHTMLElement('HTMLFieldSetElement')
 addHTMLElement('HTMLFontElement')
 addHTMLElement('HTMLFormElement')
 addHTMLElement('HTMLFrameElement')
@@ -172,8 +91,8 @@ addHTMLElement('HTMLHeadElement')
 addHTMLElement('HTMLHeadingElement')
 addHTMLElement('HTMLHtmlElement')
 addHTMLElement('HTMLHRElement')
-addHTMLElement('HTMLIFrameElement', needsAbstract=['sandbox'])
-addHTMLElement('HTMLImageElement', needsAbstract=['alt', 'src', 'useMap', 'isMap', 'width', 'height', 'name', 'align', 'hspace', 'vspace', 'longDesc', 'border'])
+addHTMLElement('HTMLIFrameElement')
+addHTMLElement('HTMLImageElement')
 addHTMLElement('HTMLInputElement')
 addHTMLElement('HTMLLabelElement')
 addHTMLElement('HTMLLegendElement')
@@ -195,7 +114,7 @@ addHTMLElement('HTMLParamElement')
 addHTMLElement('HTMLPreElement')
 addHTMLElement('HTMLProgressElement')
 addHTMLElement('HTMLQuoteElement')
-addHTMLElement('HTMLScriptElement', needsAbstract=['src'])
+addHTMLElement('HTMLScriptElement')
 addHTMLElement('HTMLSelectElement')
 addHTMLElement('HTMLSourceElement')
 addHTMLElement('HTMLSpanElement')

src/components/script/dom/bindings/codegen/CodegenRust.py

@@ -394,6 +394,9 @@ def typeIsSequenceOrHasSequenceMember(type):
                    type.flatMemberTypes)
     return False
 
+def typeNeedsRooting(type, descriptorProvider):
+    return type.isGeckoInterface() and descriptorProvider.getDescriptor(type.name).needsRooting
+
 def getJSToNativeConversionTemplate(type, descriptorProvider, failureCode=None,
                                     isDefinitelyObject=False,
                                     isMember=False,
@@ -481,6 +484,8 @@ def getJSToNativeConversionTemplate(type, descriptorProvider, failureCode=None,
     if exceptionCode is None:
         exceptionCode = "return 0;"
 
+    needsRooting = typeNeedsRooting(type, descriptorProvider)
+
     def handleOptional(template, declType, isOptional):
         if isOptional:
             template = "Some(%s)" % template
@@ -489,7 +494,7 @@ def getJSToNativeConversionTemplate(type, descriptorProvider, failureCode=None,
         else:
             initialValue = None
 
-        return (template, declType, isOptional, initialValue)
+        return (template, declType, isOptional, initialValue, needsRooting)
 
     # Unfortunately, .capitalize() on a string will lowercase things inside the
     # string, which we do not want.
@@ -551,7 +556,7 @@ def getJSToNativeConversionTemplate(type, descriptorProvider, failureCode=None,
             templateBody += (
                 "} else {\n" +
                 CGIndenter(onFailureNotAnObject(failureCode)).define() +
-                "}")
+                "}\n")
             if type.nullable():
                 templateBody = handleDefaultNull(templateBody, "None")
             else:
@@ -601,6 +606,8 @@ def getJSToNativeConversionTemplate(type, descriptorProvider, failureCode=None,
                                           failureCode)
             return handleOptional(template, declType, isOptional)
 
+        descriptorType = descriptor.memberType if isMember else descriptor.nativeType
+
         templateBody = ""
         if descriptor.interface.isConsequential():
             raise TypeError("Consequential interface %s being used as an "
@@ -616,11 +623,14 @@ def getJSToNativeConversionTemplate(type, descriptorProvider, failureCode=None,
                     descriptor,
                     "(${val}).to_object()"))
 
-        declType = CGGeneric(descriptor.nativeType)
+        declType = CGGeneric(descriptorType)
         if type.nullable():
             templateBody = "Some(%s)" % templateBody
             declType = CGWrapper(declType, pre="Option<", post=">")
 
+        if isMember:
+            templateBody += ".root()"
+
         templateBody = wrapObjectTemplate(templateBody, isDefinitelyObject,
                                           type, failureCode)
 
@@ -745,7 +755,7 @@ def getJSToNativeConversionTemplate(type, descriptorProvider, failureCode=None,
             "} else {\n"
             "  ${declName} = NULL;\n"
             "}" % haveCallable,
-            CGGeneric("JSObject*"), isOptional, None)
+            CGGeneric("JSObject*"), isOptional, None, needsRooting)
 
     if type.isAny():
         assert not isEnforceRange and not isClamp
@@ -789,7 +799,7 @@ def getJSToNativeConversionTemplate(type, descriptorProvider, failureCode=None,
         assert not isOptional
         # This one only happens for return values, and its easy: Just
         # ignore the jsval.
-        return ("", None, False, None)
+        return ("", None, False, None, False)
 
     if not type.isPrimitive():
         raise TypeError("Need conversion for argument type '%s'" % str(type))
@@ -842,7 +852,7 @@ def instantiateJSToNativeConversionTemplate(templateTuple, replacements,
     replace ${argc} and ${index}, where ${index} is the index of this
     argument (0-based) and ${argc} is the total number of arguments.
     """
-    (templateBody, declType, dealWithOptional, initialValue) = templateTuple
+    (templateBody, declType, dealWithOptional, initialValue, needsRooting) = templateTuple
 
     if dealWithOptional and argcAndIndex is None:
         raise TypeError("Have to deal with optional things, but don't know how")
@@ -888,6 +898,12 @@ def instantiateJSToNativeConversionTemplate(templateTuple, replacements,
     # Add an empty CGGeneric to get an extra newline after the argument
     # conversion.
     result.append(CGGeneric(""))
+
+    if needsRooting:
+        rootBody = "let ${declName} = ${declName}.root();"
+        result.append(CGGeneric(string.Template(rootBody).substitute(replacements)))
+        result.append(CGGeneric(""))
+
     return result;
 
 def convertConstIDLValueToJSVal(value):
@@ -985,6 +1001,13 @@ def typeNeedsCx(type, retVal=False):
         return True
     return type.isCallback() or type.isAny() or type.isObject()
 
+def typeRetValNeedsRooting(type):
+    if type is None:
+        return False
+    if type.nullable():
+        type = type.inner
+    return type.isGeckoInterface() and not type.isCallback()
+
 def memberIsCreator(member):
     return member.getExtendedAttribute("Creator") is not None
 
@@ -1016,7 +1039,7 @@ def getRetvalDeclarationForType(returnType, descriptorProvider):
     if returnType.isGeckoInterface():
         descriptor = descriptorProvider.getDescriptor(
             returnType.unroll().inner.identifier.name)
-        result = CGGeneric(descriptor.nativeType)
+        result = CGGeneric(descriptor.returnType)
         if returnType.nullable():
             result = CGWrapper(result, pre="Option<", post=">")
         return result
@@ -1365,7 +1388,7 @@ class CGImports(CGWrapper):
     """
     Generates the appropriate import/use statements.
     """
-    def __init__(self, child, imports):
+    def __init__(self, child, descriptors, imports):
         """
         Adds a set of imports.
         """
@@ -1385,6 +1408,10 @@ class CGImports(CGWrapper):
             'dead_code',
         ]
 
+        for d in descriptors:
+            name = d.interface.identifier.name
+            imports.append('dom::%s::%sMethods' % (name.lower(), name))
+
         statements = ['#![allow(%s)]' % ','.join(ignored_warnings)]
         statements.extend('use %s;' % i for i in sorted(imports))
 
@@ -1763,7 +1790,7 @@ class CGAbstractMethod(CGThing):
     def _returnType(self):
         return (" -> %s" % self.returnType) if self.returnType != "void" else ""
     def _unsafe_open(self):
-        return "\n  unsafe {" if self.unsafe else ""
+        return "\n  unsafe {\n" if self.unsafe else ""
     def _unsafe_close(self):
         return "\n  }\n" if self.unsafe else ""
 
@@ -1783,7 +1810,7 @@ def CreateBindingJSObject(descriptor, parent=None):
     if descriptor.proxy:
         assert not descriptor.createGlobal
         handler = """
-  let js_info = aScope.get().page().js_info();
+  let js_info = aScope.deref().page().js_info();
   let handler = js_info.get_ref().dom_static.proxy_handlers.deref().get(&(PrototypeList::id::%s as uint));
 """ % descriptor.name
         create += handler + """  let obj = NewProxyObject(aCx, *handler,
@@ -1809,7 +1836,7 @@ class CGWrapMethod(CGAbstractMethod):
     def __init__(self, descriptor):
         assert descriptor.interface.hasInterfacePrototypeObject()
         if not descriptor.createGlobal:
-            args = [Argument('*JSContext', 'aCx'), Argument('&JS<Window>', 'aScope'),
+            args = [Argument('*JSContext', 'aCx'), Argument('&JSRef<Window>', 'aScope'),
                     Argument("~" + descriptor.concreteType, 'aObject', mutable=True)]
         else:
             args = [Argument('*JSContext', 'aCx'),
@@ -2210,6 +2237,9 @@ class CGCallGenerator(CGThing):
             self.cgRoot.append(CGGeneric("}"))
             self.cgRoot.append(CGGeneric("result = result_fallible.unwrap();"))
 
+        if typeRetValNeedsRooting(returnType):
+            self.cgRoot.append(CGGeneric("let result = result.root();"))
+
     def define(self):
         return self.cgRoot.define()
 
@@ -2277,7 +2307,12 @@ class CGPerSignatureCall(CGThing):
     def getArgc(self):
         return "argc"
     def getArguments(self):
-        return [(a, "arg" + str(i)) for (i, a) in enumerate(self.arguments)]
+        def process(arg, i):
+            argVal = "arg" + str(i)
+            if arg.type.isGeckoInterface() and not arg.type.unroll().inner.isCallback():
+                argVal += ".root_ref()"
+            return argVal
+        return [(a, process(a, i)) for (i, a) in enumerate(self.arguments)]
 
     def isFallible(self):
         return not 'infallible' in self.extendedAttributes
@@ -2447,17 +2482,10 @@ class CGSpecializedMethod(CGAbstractExternMethod):
 
     def definition_body(self):
         name = self.method.identifier.name
-        nativeName = MakeNativeName(name)
-        extraPre = ''
-        argsPre = []
-        if name in self.descriptor.needsAbstract:
-            abstractName = re.sub(r'<\w+>', '', self.descriptor.nativeType)
-            extraPre = '  let mut abstract_this = %s::from_raw(this);\n' % abstractName
-            argsPre = ['&mut abstract_this']
-        return CGWrapper(CGMethodCall(argsPre, nativeName, self.method.isStatic(),
+        return CGWrapper(CGMethodCall([], MakeNativeName(name), self.method.isStatic(),
                                       self.descriptor, self.method),
-                         pre=extraPre +
-                             "  let this = &mut *this;\n").define()
+                         pre="  let this = JS::from_raw(this);\n" +
+                             "  let mut this = this.root();\n").define()
 
 class CGGenericGetter(CGAbstractBindingMethod):
     """
@@ -2480,10 +2508,8 @@ class CGGenericGetter(CGAbstractBindingMethod):
 
     def generate_code(self):
         return CGIndenter(CGGeneric(
-            "return with_gc_disabled(cx, || {\n"
-            "  let info: *JSJitInfo = RUST_FUNCTION_VALUE_TO_JITINFO(JS_CALLEE(cx, &*vp));\n"
-            "  CallJitPropertyOp(info, cx, obj, this.unsafe_get() as *libc::c_void, &*vp)\n"
-            "});\n"))
+            "let info: *JSJitInfo = RUST_FUNCTION_VALUE_TO_JITINFO(JS_CALLEE(cx, &*vp));\n"
+            "return CallJitPropertyOp(info, cx, obj, this.unsafe_get() as *libc::c_void, &*vp);\n"))
 
 class CGSpecializedGetter(CGAbstractExternMethod):
     """
@@ -2502,21 +2528,15 @@ class CGSpecializedGetter(CGAbstractExternMethod):
     def definition_body(self):
         name = self.attr.identifier.name
         nativeName = MakeNativeName(name)
-        extraPre = ''
-        argsPre = []
         infallible = ('infallible' in
                       self.descriptor.getExtendedAttributes(self.attr,
                                                             getter=True))
-        if name in self.descriptor.needsAbstract:
-            abstractName = re.sub(r'<\w+>', '', self.descriptor.nativeType)
-            extraPre = '  let mut abstract_this = %s::from_raw(this);\n' % abstractName
-            argsPre = ['&mut abstract_this']
         if self.attr.type.nullable() or not infallible:
             nativeName = "Get" + nativeName
-        return CGWrapper(CGIndenter(CGGetterCall(argsPre, self.attr.type, nativeName,
+        return CGWrapper(CGIndenter(CGGetterCall([], self.attr.type, nativeName,
                                                  self.descriptor, self.attr)),
-                         pre=extraPre +
-                             "  let this = &mut *this;\n").define()
+                         pre="  let this = JS::from_raw(this);\n" +
+                             "  let mut this = this.root();\n").define()
 
 class CGGenericSetter(CGAbstractBindingMethod):
     """
@@ -2541,10 +2561,7 @@ class CGGenericSetter(CGAbstractBindingMethod):
                 "let undef = UndefinedValue();\n"
                 "let argv: *JSVal = if argc != 0 { JS_ARGV(cx, vp as *JSVal) } else { &undef as *JSVal };\n"
                 "let info: *JSJitInfo = RUST_FUNCTION_VALUE_TO_JITINFO(JS_CALLEE(cx, vp as *JSVal));\n"
-                "let ok = with_gc_disabled(cx, || {\n"
-                "  CallJitPropertyOp(info, cx, obj, this.unsafe_get() as *libc::c_void, argv)\n"
-                "});\n"
-                "if ok == 0 {\n"
+                "if CallJitPropertyOp(info, cx, obj, this.unsafe_get() as *libc::c_void, argv) == 0 {\n"
                 "  return 0;\n"
                 "}\n"
                 "*vp = UndefinedValue();\n"
@@ -2566,17 +2583,11 @@ class CGSpecializedSetter(CGAbstractExternMethod):
 
     def definition_body(self):
         name = self.attr.identifier.name
-        nativeName = "Set" + MakeNativeName(name)
-        argsPre = []
-        extraPre = ''
-        if name in self.descriptor.needsAbstract:
-            abstractName = re.sub(r'<\w+>', '', self.descriptor.nativeType)
-            extraPre = '  let mut abstract_this = %s::from_raw(this);\n' % abstractName
-            argsPre = ['&mut abstract_this']
-        return CGWrapper(CGIndenter(CGSetterCall(argsPre, self.attr.type, nativeName,
+        return CGWrapper(CGIndenter(CGSetterCall([], self.attr.type,
+                                                 "Set" + MakeNativeName(name),
                                                  self.descriptor, self.attr)),
-                         pre=extraPre +
-                             "  let this = &mut *this;\n").define()
+                         pre="  let this = JS::from_raw(this);\n" +
+                             "  let mut this = this.root();\n").define()
 
 
 class CGMemberJITInfo(CGThing):
@@ -2744,7 +2755,7 @@ def getUnionTypeTemplateVars(type, descriptorProvider):
         name = type.name
         typeName = "/*" + type.name + "*/"
 
-    (template, _, _, _) = getJSToNativeConversionTemplate(
+    (template, _, _, _, _) = getJSToNativeConversionTemplate(
         type, descriptorProvider, failureCode="return Ok(None);",
         exceptionCode='return Err(());',
         isDefinitelyObject=True, isOptional=False)
@@ -3411,7 +3422,12 @@ class CGProxySpecialOperation(CGPerSignatureCall):
             self.cgRoot.prepend(CGGeneric("let mut found = false;"))
 
     def getArguments(self):
-        args = [(a, a.identifier.name) for a in self.arguments]
+        def process(arg):
+            argVal = arg.identifier.name
+            if arg.type.isGeckoInterface() and not arg.type.unroll().inner.isCallback():
+                argVal += ".root_ref()"
+            return argVal
+        args = [(a, process(a)) for a in self.arguments]
         if self.idlNode.isGetter():
             args.append((FakeArgument(BuiltinTypes[IDLBuiltinType.Types.boolean],
                                       self.idlNode),
@@ -3461,14 +3477,14 @@ class CGProxyNamedSetter(CGProxySpecialOperation):
 class CGProxyUnwrap(CGAbstractMethod):
     def __init__(self, descriptor):
         args = [Argument('*JSObject', 'obj')]
-        CGAbstractMethod.__init__(self, descriptor, "UnwrapProxy", '*' + descriptor.concreteType, args, alwaysInline=True)
+        CGAbstractMethod.__init__(self, descriptor, "UnwrapProxy", '*mut ' + descriptor.concreteType, args, alwaysInline=True)
 
     def definition_body(self):
         return """  /*if (xpc::WrapperFactory::IsXrayWrapper(obj)) {
     obj = js::UnwrapObject(obj);
   }*/
   //MOZ_ASSERT(IsProxy(obj));
-  let box_: *%s = cast::transmute(GetProxyPrivate(obj).to_private());
+  let box_: *mut %s = cast::transmute(GetProxyPrivate(obj).to_private());
   return box_;""" % (self.descriptor.concreteType)
 
 class CGDOMJSProxyHandler_getOwnPropertyDescriptor(CGAbstractExternMethod):
@@ -3493,9 +3509,11 @@ class CGDOMJSProxyHandler_getOwnPropertyDescriptor(CGAbstractExternMethod):
             templateValues = {'jsvalRef': '(*desc).value', 'successCode': fillDescriptor}
             get = ("if index.is_some() {\n" +
                    "  let index = index.unwrap();\n" +
-                   "  let this: *%s = UnwrapProxy(proxy);\n" +
+                   "  let this = UnwrapProxy(proxy);\n" +
+                   "  let this = JS::from_raw(this);\n" +
+                   "  let mut this = this.root();\n" +
                    CGIndenter(CGProxyIndexedGetter(self.descriptor, templateValues)).define() + "\n" +
-                   "}\n") % (self.descriptor.concreteType)
+                   "}\n")
 
         if indexedSetter or self.descriptor.operations['NamedSetter']:
             setOrIndexedGet += "if set != 0 {\n"
@@ -3538,9 +3556,11 @@ class CGDOMJSProxyHandler_getOwnPropertyDescriptor(CGAbstractExternMethod):
             namedGet = ("\n" +
                         "if set == 0 && RUST_JSID_IS_STRING(id) != 0 && !HasPropertyOnPrototype(cx, proxy, id) {\n" +
                         "  let name = Some(jsid_to_str(cx, id));\n" +
-                        "  let this: *%s = UnwrapProxy(proxy);\n" +
+                        "  let this = UnwrapProxy(proxy);\n" +
+                        "  let this = JS::from_raw(this);\n" +
+                        "  let mut this = this.root();\n" +
                         CGIndenter(CGProxyNamedGetter(self.descriptor, templateValues)).define() + "\n" +
-                        "}\n") % (self.descriptor.concreteType)
+                        "}\n")
         else:
             namedGet = ""
 
@@ -3581,10 +3601,12 @@ class CGDOMJSProxyHandler_defineProperty(CGAbstractExternMethod):
             set += ("let index = GetArrayIndexFromId(cx, id);\n" +
                     "if index.is_some() {\n" +
                     "  let index = index.unwrap();\n" +
-                    "  let this: *mut %s = UnwrapProxy(proxy) as *mut %s;\n" +
+                    "  let this = UnwrapProxy(proxy);\n" +
+                    "  let this = JS::from_raw(this);\n" +
+                    "  let mut this = this.root();\n" +
                     CGIndenter(CGProxyIndexedSetter(self.descriptor)).define() +
                     "  return 1;\n" +
-                    "}\n") % (self.descriptor.concreteType, self.descriptor.concreteType)
+                    "}\n")
         elif self.descriptor.operations['IndexedGetter']:
             set += ("if GetArrayIndexFromId(cx, id).is_some() {\n" +
                     "  return 0;\n" +
@@ -3597,20 +3619,24 @@ class CGDOMJSProxyHandler_defineProperty(CGAbstractExternMethod):
                 raise TypeError("Can't handle creator that's different from the setter")
             set += ("if RUST_JSID_IS_STRING(id) != 0 {\n" +
                     "  let name = Some(jsid_to_str(cx, id));\n" +
-                    "  let this: *%s = UnwrapProxy(proxy);\n" +
+                    "  let this = UnwrapProxy(proxy);\n" +
+                    "  let this = JS::from_raw(this);\n" +
+                    "  let mut this = this.root();\n" +
                     CGIndenter(CGProxyNamedSetter(self.descriptor)).define() + "\n" +
-                    "}\n") % (self.descriptor.concreteType)
+                    "}\n")
         elif self.descriptor.operations['NamedGetter']:
             set += ("if RUST_JSID_IS_STRING(id) {\n" +
                     "  let name = Some(jsid_to_str(cx, id));\n" +
-                    "  let this: %%s = UnwrapProxy(proxy);\n" +
+                    "  let this = UnwrapProxy(proxy);\n" +
+                    "  let this = JS::from_raw(this);\n" +
+                    "  let mut this = this.root();\n" +
                     CGIndenter(CGProxyNamedGetter(self.descriptor)).define() +
                     "  if (found) {\n"
                     "    return 0;\n" +
                     "    //return ThrowErrorMessage(cx, MSG_NO_PROPERTY_SETTER, \"%s\");\n" +
                     "  }\n" +
                     "  return 1;\n"
-                    "}\n") % (self.descriptor.concreteType, self.descriptor.name)
+                    "}\n") % (self.descriptor.name)
         return set + """return proxyhandler::defineProperty_(%s);""" % ", ".join(a.name for a in self.args)
 
     def definition_body(self):
@@ -3628,11 +3654,13 @@ class CGDOMJSProxyHandler_hasOwn(CGAbstractExternMethod):
             indexed = ("let index = GetArrayIndexFromId(cx, id);\n" +
                        "if index.is_some() {\n" +
                        "  let index = index.unwrap();\n" +
-                       "  let this: *%s = UnwrapProxy(proxy);\n" +
+                       "  let this = UnwrapProxy(proxy);\n" +
+                       "  let this = JS::from_raw(this);\n" +
+                       "  let mut this = this.root();\n" +
                        CGIndenter(CGProxyIndexedGetter(self.descriptor)).define() + "\n" +
                        "  *bp = found as JSBool;\n" +
                        "  return 1;\n" +
-                       "}\n\n") % (self.descriptor.concreteType)
+                       "}\n\n")
         else:
             indexed = ""
 
@@ -3640,12 +3668,14 @@ class CGDOMJSProxyHandler_hasOwn(CGAbstractExternMethod):
         if namedGetter:
             named = ("if RUST_JSID_IS_STRING(id) != 0 && !HasPropertyOnPrototype(cx, proxy, id) {\n" +
                      "  let name = Some(jsid_to_str(cx, id));\n" +
-                     "  let this: *%s = UnwrapProxy(proxy);\n" +
+                     "  let this = UnwrapProxy(proxy);\n" +
+                     "  let this = JS::from_raw(this);\n" +
+                     "  let mut this = this.root();\n" +
                      CGIndenter(CGProxyNamedGetter(self.descriptor)).define() + "\n" +
                      "  *bp = found as JSBool;\n"
                      "  return 1;\n"
                      "}\n" +
-                     "\n") % (self.descriptor.concreteType)
+                     "\n")
         else:
             named = ""
 
@@ -3693,6 +3723,8 @@ if expando.is_not_null() {
                                    "if index.is_some() {\n" +
                                    "  let index = index.unwrap();\n" +
                                    "  let this = UnwrapProxy(proxy);\n" +
+                                   "  let this = JS::from_raw(this);\n" +
+                                   "  let mut this = this.root();\n" +
                                    CGIndenter(CGProxyIndexedGetter(self.descriptor, templateValues)).define())
             getIndexedOrExpando += """
   // Even if we don't have this index, we don't forward the
@@ -3709,6 +3741,8 @@ if expando.is_not_null() {
             getNamed = ("if (JSID_IS_STRING(id)) {\n" +
                         "  let name = Some(jsid_to_str(cx, id));\n" +
                         "  let this = UnwrapProxy(proxy);\n" +
+                        "  let this = JS::from_raw(this);\n" +
+                        "  let mut this = this.root();\n" +
                         CGIndenter(CGProxyNamedGetter(self.descriptor, templateValues)).define() +
                         "}\n") % (self.descriptor.concreteType)
         else:
@@ -3825,11 +3859,11 @@ class CGClassConstructHook(CGAbstractExternMethod):
 
     def generate_code(self):
         preamble = """
-  let global = global_object_for_js_object(JS_CALLEE(cx, &*vp).to_object());
-  let obj = global.reflector().get_jsobject();
+  let global = global_object_for_js_object(JS_CALLEE(cx, &*vp).to_object()).root();
+  let obj = global.deref().reflector().get_jsobject();
 """
         nativeName = MakeNativeName(self._ctor.identifier.name)
-        callGenerator = CGMethodCall(["&global"], nativeName, True,
+        callGenerator = CGMethodCall(["&global.root_ref()"], nativeName, True,
                                      self.descriptor, self._ctor)
         return preamble + callGenerator.define();
 
@@ -4030,7 +4064,7 @@ class CGDictionary(CGThing):
     def struct(self):
         d = self.dictionary
         if d.parent:
-            inheritance = "  pub parent: %s::%s,\n" % (self.makeModuleName(d.parent),
+            inheritance = "  pub parent: %s::%s<'a, 'b>,\n" % (self.makeModuleName(d.parent),
                                                    self.makeClassName(d.parent))
         else:
             inheritance = ""
@@ -4039,7 +4073,7 @@ class CGDictionary(CGThing):
                        for m in self.memberInfo]
 
         return (string.Template(
-                "pub struct ${selfName} {\n" +
+                "pub struct ${selfName}<'a, 'b> {\n" +
                 "${inheritance}" +
                 "\n".join(memberDecls) + "\n" +
                 "}").substitute( { "selfName": self.makeClassName(d),
@@ -4065,7 +4099,7 @@ class CGDictionary(CGThing):
         memberInits = CGList([memberInit(m) for m in self.memberInfo])
 
         return string.Template(
-            "impl ${selfName} {\n"
+            "impl<'a, 'b> ${selfName}<'a, 'b> {\n"
             "  pub fn new(cx: *JSContext, val: JSVal) -> Result<${selfName}, ()> {\n"
             "    let object = if val.is_null_or_undefined() {\n"
             "        ptr::null()\n"
@@ -4104,14 +4138,14 @@ class CGDictionary(CGThing):
 
     def getMemberType(self, memberInfo):
         (member, (templateBody, declType,
-                  dealWithOptional, initialValue)) = memberInfo
+                  dealWithOptional, initialValue, _)) = memberInfo
         if dealWithOptional:
             declType = CGWrapper(declType, pre="Optional< ", post=" >")
         return declType.define()
 
     def getMemberConversion(self, memberInfo):
         (member, (templateBody, declType,
-                  dealWithOptional, initialValue)) = memberInfo
+                  dealWithOptional, initialValue, _)) = memberInfo
         replacements = { "val": "value.unwrap()" }
         if member.defaultValue:
             replacements["haveValue"] = "value.is_some()"
@@ -4238,7 +4272,7 @@ class CGBindingRoot(CGThing):
         # Add imports
         #XXXjdm This should only import the namespace for the current binding,
         #       not every binding ever.
-        curr = CGImports(curr, [
+        curr = CGImports(curr, descriptors, [
             'js',
             'js::{JS_ARGV, JS_CALLEE, JS_THIS_OBJECT}',
             'js::{JSCLASS_GLOBAL_SLOT_COUNT, JSCLASS_IS_DOMJSCLASS}',
@@ -4266,7 +4300,9 @@ class CGBindingRoot(CGThing):
             'js::glue::{RUST_JS_NumberValue, RUST_JSID_IS_STRING}',
             'dom::types::*',
             'dom::bindings',
-            'dom::bindings::js::JS',
+            'dom::bindings::js::{JS, JSRef, Root, RootedReference, Temporary}',
+            'dom::bindings::js::{OptionalRootable, OptionalRootedRootable, ResultRootable}',
+            'dom::bindings::js::{OptionalRootedReference, OptionalOptionalRootedRootable}',
             'dom::bindings::utils::{CreateDOMGlobal, CreateInterfaceObjects2}',
             'dom::bindings::utils::{ConstantSpec, cx_for_dom_object, Default}',
             'dom::bindings::utils::{dom_object_slot, DOM_OBJECT_SLOT, DOMClass}',
@@ -4279,8 +4315,7 @@ class CGBindingRoot(CGThing):
             'dom::bindings::utils::{Reflectable}',
             'dom::bindings::utils::{squirrel_away_unique}',
             'dom::bindings::utils::{ThrowingConstructor,  unwrap, unwrap_jsmanaged}',
-            'dom::bindings::utils::{VoidVal, with_gc_disabled}',
-            'dom::bindings::utils::{with_gc_enabled}',
+            'dom::bindings::utils::VoidVal',
             'dom::bindings::utils::get_dictionary_property',
             'dom::bindings::trace::JSTraceable',
             'dom::bindings::callback::{CallbackContainer,CallbackInterface}',
@@ -4549,7 +4584,7 @@ class CGNativeMember(ClassMethod):
                 else:
                     typeDecl = "%s"
             descriptor = self.descriptorProvider.getDescriptor(iface.identifier.name)
-            return (typeDecl % descriptor.nativeType,
+            return (typeDecl % descriptor.argumentType,
                     False, False)
 
         if type.isSpiderMonkeyInterface():
@@ -5057,11 +5092,8 @@ class CallbackMethod(CallbackMember):
             replacements["argc"] = "0"
         return string.Template("${getCallable}"
                 "let ok = unsafe {\n"
-                "  //JS_AllowGC(cx); // It's unsafe to enable GC at arbitrary points during Rust execution; leave it disabled\n"
-                "  let ok = JS_CallFunctionValue(cx, ${thisObj}, callable,\n"
-                "                                ${argc}, ${argv}, &rval);\n"
-                "  //JS_InhibitGC(cx);\n"
-                "  ok\n"
+                "  JS_CallFunctionValue(cx, ${thisObj}, callable,\n"
+                "                       ${argc}, ${argv}, &rval)\n"
                 "};\n"
                 "if ok == 0 {\n"
                 "  return${errorReturn};\n"
@@ -5207,9 +5239,9 @@ class GlobalGenRoots():
     @staticmethod
     def RegisterBindings(config):
         # TODO - Generate the methods we want
-        return CGImports(CGRegisterProtos(config), [
+        return CGImports(CGRegisterProtos(config), [], [
             'dom::bindings::codegen',
-            'dom::bindings::js::JS',
+            'dom::bindings::js::{JS, JSRef}',
             'dom::window::Window',
             'script_task::JSPageInfo',
         ])
@@ -5241,8 +5273,9 @@ class GlobalGenRoots():
         descriptors = config.getDescriptors(register=True, hasInterfaceObject=True)
         allprotos = [CGGeneric("#![allow(unused_imports)]\n"),
                      CGGeneric("use dom::types::*;\n"),
-                     CGGeneric("use dom::bindings::js::JS;\n"),
+                     CGGeneric("use dom::bindings::js::{JS, JSRef, Temporary};\n"),
                      CGGeneric("use dom::bindings::trace::JSTraceable;\n"),
+                     CGGeneric("use dom::bindings::utils::Reflectable;\n"),
                      CGGeneric("use serialize::{Encodable, Encoder};\n"),
                      CGGeneric("use js::jsapi::JSTracer;\n\n")]
         for descriptor in descriptors:
@@ -5269,22 +5302,34 @@ class GlobalGenRoots():
 
             cast = [CGGeneric(string.Template('''pub trait ${castTraitName} {
   #[inline(always)]
-  fn from<T: ${fromBound}>(derived: &JS<T>) -> JS<Self> {
-    unsafe { derived.clone().transmute() }
-  }
-
-  #[inline(always)]
-  fn to<T: ${toBound}>(base: &JS<T>) -> Option<JS<Self>> {
-    match base.get().${checkFn}() {
-        true => unsafe { Some(base.clone().transmute()) },
+  fn to_ref<'a, 'b, T: ${toBound}+Reflectable>(base: &'a JSRef<'b, T>) -> Option<&'a JSRef<'b, Self>> {
+    match base.deref().${checkFn}() {
+        true => unsafe { Some(base.transmute()) },
         false => None
     }
   }
 
   #[inline(always)]
-  unsafe fn to_unchecked<T: ${toBound}>(base: &JS<T>) -> JS<Self> {
-    assert!(base.get().${checkFn}());
-    base.clone().transmute()
+  fn to_mut_ref<'a, 'b, T: ${toBound}+Reflectable>(base: &'a mut JSRef<'b, T>) -> Option<&'a mut JSRef<'b, Self>> {
+    match base.deref().${checkFn}() {
+        true => unsafe { Some(base.transmute_mut()) },
+        false => None
+    }
+  }
+
+  #[inline(always)]
+  fn from_ref<'a, 'b, T: ${fromBound}>(derived: &'a JSRef<'b, T>) -> &'a JSRef<'b, Self> {
+    unsafe { derived.transmute() }
+  }
+
+  #[inline(always)]
+  fn from_mut_ref<'a, 'b, T: ${fromBound}>(derived: &'a mut JSRef<'b, T>) -> &'a mut JSRef<'b, Self> {
+    unsafe { derived.transmute_mut() }
+  }
+
+  #[inline(always)]
+  fn from_unrooted<T: ${fromBound}+Reflectable>(derived: Temporary<T>) -> Temporary<Self> {
+    unsafe { derived.transmute() }
   }
 }
 ''').substitute({'checkFn': 'is_' + name.lower(),
@@ -5313,7 +5358,7 @@ class GlobalGenRoots():
 
         curr = UnionTypes(config.getDescriptors())
 
-        curr = CGImports(curr, [
+        curr = CGImports(curr, [], [
             'dom::bindings::utils::unwrap_jsmanaged',
             'dom::bindings::codegen::PrototypeList',
             'dom::bindings::conversions::{FromJSValConvertible, ToJSValConvertible}',

src/components/script/dom/bindings/codegen/Configuration.py

@@ -128,14 +128,19 @@ class Descriptor(DescriptorProvider):
 
         # Read the desc, and fill in the relevant defaults.
         ifaceName = self.interface.identifier.name
-        if self.interface.isCallback():
-            nativeTypeDefault = "nsIDOM" + ifaceName
-        else:
-            nativeTypeDefault = 'JS<%s>' % ifaceName
 
-        self.nativeType = desc.get('nativeType', nativeTypeDefault)
+        # Callback types do not use JS smart pointers, so we should not use the
+        # built-in rooting mechanisms for them.
+        if self.interface.isCallback():
+            self.needsRooting = False
+        else:
+            self.needsRooting = True
+
+        self.returnType = "Temporary<%s>" % ifaceName
+        self.argumentType = "JSRef<%s>" % ifaceName
+        self.memberType = "Root<'a, 'b, %s>" % ifaceName
+        self.nativeType = desc.get('nativeType', 'JS<%s>' % ifaceName)
         self.concreteType = desc.get('concreteType', ifaceName)
-        self.needsAbstract = desc.get('needsAbstract', [])
         self.createGlobal = desc.get('createGlobal', False)
         self.register = desc.get('register', True)
         self.outerObjectHook = desc.get('outerObjectHook', 'None')

src/components/script/dom/bindings/conversions.rs

@@ -2,9 +2,9 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Root};
 use dom::bindings::str::ByteString;
-use dom::bindings::utils::Reflectable;
+use dom::bindings::utils::{Reflectable, Reflector};
 use dom::bindings::utils::jsstring_to_str;
 use dom::bindings::utils::unwrap_jsmanaged;
 use servo_util::str::DOMString;
@@ -293,9 +293,9 @@ impl FromJSValConvertible<()> for ByteString {
     }
 }
 
-impl<T: Reflectable> ToJSValConvertible for JS<T> {
+impl ToJSValConvertible for Reflector {
     fn to_jsval(&self, cx: *JSContext) -> JSVal {
-        let obj = self.reflector().get_jsobject();
+        let obj = self.get_jsobject();
         assert!(obj.is_not_null());
         let mut value = ObjectValue(unsafe { &*obj });
         if unsafe { JS_WrapValue(cx, &mut value as *mut JSVal as *JSVal) } == 0 {
@@ -316,6 +316,18 @@ impl<T: Reflectable+IDLInterface> FromJSValConvertible<()> for JS<T> {
     }
 }
 
+impl<'a, 'b, T: Reflectable> ToJSValConvertible for Root<'a, 'b, T> {
+    fn to_jsval(&self, cx: *JSContext) -> JSVal {
+        self.reflector().to_jsval(cx)
+    }
+}
+
+impl<'a, T: Reflectable> ToJSValConvertible for JSRef<'a, T> {
+    fn to_jsval(&self, cx: *JSContext) -> JSVal {
+        self.reflector().to_jsval(cx)
+    }
+}
+
 impl<T: ToJSValConvertible> ToJSValConvertible for Option<T> {
     fn to_jsval(&self, cx: *JSContext) -> JSVal {
         match self {

src/components/script/dom/bindings/js.rs

@@ -2,14 +2,115 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use dom::bindings::utils::{Reflector, Reflectable};
-use dom::window::Window;
-use js::jsapi::JSContext;
+/// The DOM is made up of Rust types whose lifetime is entirely controlled by the whims of
+/// the SpiderMonkey garbage collector. The types in this module are designed to ensure
+/// that any interactions with said Rust types only occur on values that will remain alive
+/// the entire time.
+///
+/// Here is a brief overview of the important types:
+/// - JSRef<T>: a freely-copyable reference to a rooted value.
+/// - JS<T>: a pointer to JS-owned memory that can automatically be traced by the GC when
+///          encountered as a field of a Rust structure.
+/// - Temporary<T>: a value that will remain rooted for the duration of its lifetime.
+///
+/// The rule of thumb is as follows:
+/// - All methods return Temporary<T>, to ensure the value remains alive until it is stored
+///   somewhere that is reachable by the GC.
+/// - All functions take &JSRef<T> arguments, to ensure that they will remain uncollected for
+///   the duration of their usage.
+/// - All types contain JS<T> fields and derive the Encodable trait, to ensure that they are
+///   transitively marked as reachable by the GC if the enclosing value is reachable.
+/// - All methods for type T are implemented for JSRef<T>, to ensure that the self value
+///   will not be collected for the duration of the method call.
+///
+/// Both Temporary<T> and JS<T> do not allow access to their inner value without explicitly
+/// creating a stack-based root via the `root` method. This returns a Root<T>, which causes
+/// the JS-owned value to be uncollectable for the duration of the Root type's lifetime.
+/// A JSRef<T> can be obtained from a Root<T> either by dereferencing the Root<T> (`*rooted`)
+/// or explicitly calling the `root_ref` method. These JSRef<T> values are not allowed to
+/// outlive their originating Root<T>, to ensure that all interactions with the enclosed value
+/// only occur when said value is uncollectable, and will cause static lifetime errors if
+/// misused.
+///
+/// Other miscellaneous helper traits:
+/// - OptionalRootable and OptionalRootedRootable: make rooting Option values easy via a `root` method
+/// - ResultRootable: make rooting successful Result values easy
+/// - TemporaryPushable: allows mutating vectors of JS<T> with new elements of JSRef/Temporary
+/// - OptionalSettable: allows assigning Option values of JSRef/Temporary to fields of Option<JS<T>>
+/// - RootedReference: makes obtaining an Option<JSRef<T>> from an Option<Root<T>> easy
+
+use dom::bindings::utils::{Reflector, Reflectable, cx_for_dom_object};
+use dom::node::Node;
+use js::jsapi::{JSObject, JS_AddObjectRoot, JS_RemoveObjectRoot};
 use layout_interface::TrustedNodeAddress;
+use script_task::StackRoots;
 
 use std::cast;
 use std::cell::RefCell;
+use std::local_data;
 
+/// A type that represents a JS-owned value that is rooted for the lifetime of this value.
+/// Importantly, it requires explicit rooting in order to interact with the inner value.
+/// Can be assigned into JS-owned member fields (ie. JS<T> types) safely via the
+/// `JS<T>::assign` method or `OptionalSettable::assign` (for Option<JS<T>> fields).
+pub struct Temporary<T> {
+    inner: JS<T>,
+}
+
+impl<T> Eq for Temporary<T> {
+    fn eq(&self, other: &Temporary<T>) -> bool {
+        self.inner == other.inner
+    }
+}
+
+#[unsafe_destructor]
+impl<T: Reflectable> Drop for Temporary<T> {
+    fn drop(&mut self) {
+        let cx = cx_for_dom_object(&self.inner);
+        unsafe {
+            JS_RemoveObjectRoot(cx, self.inner.reflector().rootable());
+        }
+    }
+}
+
+impl<T: Reflectable> Temporary<T> {
+    /// Create a new Temporary value from a JS-owned value.
+    pub fn new(inner: JS<T>) -> Temporary<T> {
+        let cx = cx_for_dom_object(&inner);
+        unsafe {
+            JS_AddObjectRoot(cx, inner.reflector().rootable());
+        }
+        Temporary {
+            inner: inner,
+        }
+    }
+
+    /// Create a new Temporary value from a rooted value.
+    pub fn from_rooted<'a>(root: &JSRef<'a, T>) -> Temporary<T> {
+        Temporary::new(root.unrooted())
+    }
+
+    /// Create a stack-bounded root for this value.
+    pub fn root<'a, 'b>(self) -> Root<'a, 'b, T> {
+        local_data::get(StackRoots, |opt| {
+            let collection = opt.unwrap();
+            unsafe {
+                (**collection).new_root(&self.inner)
+            }
+        })
+    }
+
+    unsafe fn inner(&self) -> JS<T> {
+        self.inner.clone()
+    }
+
+    //XXXjdm It would be lovely if this could be private.
+    pub unsafe fn transmute<To>(self) -> Temporary<To> {
+        cast::transmute(self)
+    }
+}
+
+/// A rooted, JS-owned value. Must only be used as a field in other JS-owned types.
 pub struct JS<T> {
     ptr: RefCell<*mut T>
 }
@@ -29,13 +130,18 @@ impl <T> Clone for JS<T> {
     }
 }
 
-impl<T: Reflectable> JS<T> {
-    pub fn new(obj: ~T,
-               window:  &JS<Window>,
-               wrap_fn: extern "Rust" fn(*JSContext, &JS<Window>, ~T) -> JS<T>) -> JS<T> {
-        wrap_fn(window.get().get_cx(), window, obj)
+impl JS<Node> {
+    /// Create a new JS-owned value wrapped from an address known to be a Node pointer.
+    pub unsafe fn from_trusted_node_address(inner: TrustedNodeAddress) -> JS<Node> {
+        let TrustedNodeAddress(addr) = inner;
+        JS {
+            ptr: RefCell::new(addr as *mut Node)
+        }
     }
+}
 
+impl<T: Reflectable> JS<T> {
+    /// Create a new JS-owned value wrapped from a raw Rust pointer.
     pub unsafe fn from_raw(raw: *mut T) -> JS<T> {
         JS {
             ptr: RefCell::new(raw)
@@ -43,45 +149,47 @@ impl<T: Reflectable> JS<T> {
     }
 
 
-    pub unsafe fn from_trusted_node_address(inner: TrustedNodeAddress) -> JS<T> {
-        let TrustedNodeAddress(addr) = inner;
-        JS {
-            ptr: RefCell::new(addr as *mut T)
-        }
+    /// Root this JS-owned value to prevent its collection as garbage.
+    pub fn root<'a, 'b>(&self) -> Root<'a, 'b, T> {
+        local_data::get(StackRoots, |opt| {
+            let collection = opt.unwrap();
+            unsafe {
+                (**collection).new_root(self)
+            }
+        })
     }
 }
 
+//XXXjdm This is disappointing. This only gets called from trace hooks, in theory,
+//       so it's safe to assume that self is rooted and thereby safe to access.
 impl<T: Reflectable> Reflectable for JS<T> {
     fn reflector<'a>(&'a self) -> &'a Reflector {
-        self.get().reflector()
+        unsafe {
+            (*self.unsafe_get()).reflector()
+        }
     }
 
     fn mut_reflector<'a>(&'a mut self) -> &'a mut Reflector {
-        self.get_mut().mut_reflector()
+        unsafe {
+            (*self.unsafe_get()).mut_reflector()
+        }
     }
 }
 
-impl<T> JS<T> {
-    pub fn get<'a>(&'a self) -> &'a T {
-        let borrowed = self.ptr.borrow();
-        unsafe {
-            &**borrowed
-        }
-    }
-
-    pub fn get_mut<'a>(&'a mut self) -> &'a mut T {
-        let mut borrowed = self.ptr.borrow_mut();
-        unsafe {
-            &mut **borrowed
-        }
-    }
-
+impl<T: Reflectable> JS<T> {
     /// Returns an unsafe pointer to the interior of this JS object without touching the borrow
     /// flags. This is the only method that be safely accessed from layout. (The fact that this
     /// is unsafe is what necessitates the layout wrappers.)
     pub unsafe fn unsafe_get(&self) -> *mut T {
         cast::transmute_copy(&self.ptr)
     }
+
+    /// Store an unrooted value in this field. This is safe under the assumption that JS<T>
+    /// values are only used as fields in DOM types that are reachable in the GC graph,
+    /// so this unrooted value becomes transitively rooted for the lifetime of its new owner.
+    pub fn assign(&mut self, val: Temporary<T>) {
+        *self = unsafe { val.inner() };
+    }
 }
 
 impl<From, To> JS<From> {
@@ -94,3 +202,304 @@ impl<From, To> JS<From> {
         cast::transmute_copy(self)
     }
 }
+
+
+/// Get an Option<JSRef<T>> out of an Option<Root<T>>
+pub trait RootedReference<T> {
+    fn root_ref<'a>(&'a self) -> Option<JSRef<'a, T>>;
+}
+
+impl<'a, 'b, T: Reflectable> RootedReference<T> for Option<Root<'a, 'b, T>> {
+    fn root_ref<'a>(&'a self) -> Option<JSRef<'a, T>> {
+        self.as_ref().map(|root| root.root_ref())
+    }
+}
+
+/// Get an Option<Option<JSRef<T>>> out of an Option<Option<Root<T>>>
+pub trait OptionalRootedReference<T> {
+    fn root_ref<'a>(&'a self) -> Option<Option<JSRef<'a, T>>>;
+}
+
+impl<'a, 'b, T: Reflectable> OptionalRootedReference<T> for Option<Option<Root<'a, 'b, T>>> {
+    fn root_ref<'a>(&'a self) -> Option<Option<JSRef<'a, T>>> {
+        self.as_ref().map(|inner| inner.root_ref())
+    }
+}
+
+/// Trait that allows extracting a JS<T> value from a variety of rooting-related containers,
+/// which in general is an unsafe operation since they can outlive the rooted lifetime of the
+/// original value.
+/*definitely not public*/ trait Assignable<T> {
+    unsafe fn get_js(&self) -> JS<T>;
+}
+
+impl<T> Assignable<T> for JS<T> {
+    unsafe fn get_js(&self) -> JS<T> {
+        self.clone()
+    }
+}
+
+impl<'a, T> Assignable<T> for JSRef<'a, T> {
+    unsafe fn get_js(&self) -> JS<T> {
+        self.unrooted()
+    }
+}
+
+impl<T: Reflectable> Assignable<T> for Temporary<T> {
+    unsafe fn get_js(&self) -> JS<T> {
+        self.inner()
+    }
+}
+
+/// Assign an optional rootable value (either of JS<T> or Temporary<T>) to an optional
+/// field of a DOM type (ie. Option<JS<T>>)
+pub trait OptionalSettable<T> {
+    fn assign(&mut self, val: Option<T>);
+}
+
+impl<T: Assignable<U>, U: Reflectable> OptionalSettable<T> for Option<JS<U>> {
+    fn assign(&mut self, val: Option<T>) {
+        *self = val.map(|val| unsafe { val.get_js() });
+    }
+}
+
+/// Root a rootable Option type (used for Option<Temporary<T>>)
+pub trait OptionalRootable<T> {
+    fn root<'a, 'b>(self) -> Option<Root<'a, 'b, T>>;
+}
+
+impl<T: Reflectable> OptionalRootable<T> for Option<Temporary<T>> {
+    fn root<'a, 'b>(self) -> Option<Root<'a, 'b, T>> {
+        self.map(|inner| inner.root())
+    }
+}
+
+/// Return an unrooted type for storing in optional DOM fields
+pub trait OptionalUnrootable<T> {
+    fn unrooted(&self) -> Option<JS<T>>;
+}
+
+impl<'a, T: Reflectable> OptionalUnrootable<T> for Option<JSRef<'a, T>> {
+    fn unrooted(&self) -> Option<JS<T>> {
+        self.as_ref().map(|inner| inner.unrooted())
+    }
+}
+
+/// Root a rootable Option type (used for Option<JS<T>>)
+pub trait OptionalRootedRootable<T> {
+    fn root<'a, 'b>(&self) -> Option<Root<'a, 'b, T>>;
+}
+
+impl<T: Reflectable> OptionalRootedRootable<T> for Option<JS<T>> {
+    fn root<'a, 'b>(&self) -> Option<Root<'a, 'b, T>> {
+        self.as_ref().map(|inner| inner.root())
+    }
+}
+
+/// Root a rootable Option<Option> type (used for Option<Option<JS<T>>>)
+pub trait OptionalOptionalRootedRootable<T> {
+    fn root<'a, 'b>(&self) -> Option<Option<Root<'a, 'b, T>>>;
+}
+
+impl<T: Reflectable> OptionalOptionalRootedRootable<T> for Option<Option<JS<T>>> {
+    fn root<'a, 'b>(&self) -> Option<Option<Root<'a, 'b, T>>> {
+        self.as_ref().map(|inner| inner.root())
+    }
+}
+
+
+/// Root a rootable Result type (any of Temporary<T> or JS<T>)
+pub trait ResultRootable<T,U> {
+    fn root<'a, 'b>(self) -> Result<Root<'a, 'b, T>, U>;
+}
+
+impl<T: Reflectable, U> ResultRootable<T, U> for Result<Temporary<T>, U> {
+    fn root<'a, 'b>(self) -> Result<Root<'a, 'b, T>, U> {
+        self.map(|inner| inner.root())
+    }
+}
+
+impl<T: Reflectable, U> ResultRootable<T, U> for Result<JS<T>, U> {
+    fn root<'a, 'b>(self) -> Result<Root<'a, 'b, T>, U> {
+        self.map(|inner| inner.root())
+    }
+}
+
+/// Provides a facility to push unrooted values onto lists of rooted values. This is safe
+/// under the assumption that said lists are reachable via the GC graph, and therefore the
+/// new values are transitively rooted for the lifetime of their new owner.
+pub trait TemporaryPushable<T> {
+    fn push_unrooted(&mut self, val: &T);
+    fn insert_unrooted(&mut self, index: uint, val: &T);
+}
+
+impl<T: Assignable<U>, U: Reflectable> TemporaryPushable<T> for Vec<JS<U>> {
+    fn push_unrooted(&mut self, val: &T) {
+        self.push(unsafe { val.get_js() });
+    }
+
+    fn insert_unrooted(&mut self, index: uint, val: &T) {
+        self.insert(index, unsafe { val.get_js() });
+    }
+}
+
+/// An opaque, LIFO rooting mechanism.
+pub struct RootCollection {
+    roots: RefCell<Vec<*JSObject>>,
+}
+
+impl RootCollection {
+    /// Create an empty collection of roots
+    pub fn new() -> RootCollection {
+        RootCollection {
+            roots: RefCell::new(vec!()),
+        }
+    }
+
+    /// Create a new stack-bounded root that will not outlive this collection
+    fn new_root<'a, 'b, T: Reflectable>(&'a self, unrooted: &JS<T>) -> Root<'a, 'b, T> {
+        Root::new(self, unrooted)
+    }
+
+    /// Track a stack-based root to ensure LIFO root ordering
+    fn root<'a, 'b, T: Reflectable>(&self, untracked: &Root<'a, 'b, T>) {
+        let mut roots = self.roots.borrow_mut();
+        roots.push(untracked.js_ptr);
+        debug!("  rooting {:?}", untracked.js_ptr);
+    }
+
+    /// Stop tracking a stack-based root, asserting if LIFO root ordering has been violated
+    fn unroot<'a, 'b, T: Reflectable>(&self, rooted: &Root<'a, 'b, T>) {
+        let mut roots = self.roots.borrow_mut();
+        debug!("unrooting {:?} (expecting {:?}", roots.last().unwrap(), rooted.js_ptr);
+        assert!(*roots.last().unwrap() == rooted.js_ptr);
+        roots.pop().unwrap();
+    }
+}
+
+/// A rooted JS value. The JS value is pinned for the duration of this object's lifetime;
+/// roots are additive, so this object's destruction will not invalidate other roots
+/// for the same JS value. Roots cannot outlive the associated RootCollection object.
+/// Attempts to transfer ownership of a Root via moving will trigger dynamic unrooting
+/// failures due to incorrect ordering.
+pub struct Root<'a, 'b, T> {
+    /// List that ensures correct dynamic root ordering
+    root_list: &'a RootCollection,
+    /// Reference to rooted value that must not outlive this container
+    jsref: JSRef<'b, T>,
+    /// Pointer to underlying Rust data
+    ptr: RefCell<*mut T>,
+    /// On-stack JS pointer to assuage conservative stack scanner
+    js_ptr: *JSObject,
+}
+
+impl<'a, 'b, T: Reflectable> Root<'a, 'b, T> {
+    /// Create a new stack-bounded root for the provided JS-owned value.
+    /// It cannot not outlive its associated RootCollection, and it contains a JSRef
+    /// which cannot outlive this new Root.
+    fn new(roots: &'a RootCollection, unrooted: &JS<T>) -> Root<'a, 'b, T> {
+        let root = Root {
+            root_list: roots,
+            jsref: JSRef {
+                ptr: unrooted.ptr.clone(),
+                chain: unsafe { cast::transmute_region(&()) },
+            },
+            ptr: unrooted.ptr.clone(),
+            js_ptr: unrooted.reflector().get_jsobject(),
+        };
+        roots.root(&root);
+        root
+    }
+
+    /// Obtain a safe reference to the wrapped JS owned-value that cannot outlive
+    /// the lifetime of this root.
+    pub fn root_ref<'b>(&'b self) -> JSRef<'b,T> {
+        self.jsref.clone()
+    }
+}
+
+#[unsafe_destructor]
+impl<'a, 'b, T: Reflectable> Drop for Root<'a, 'b, T> {
+    fn drop(&mut self) {
+        self.root_list.unroot(self);
+    }
+}
+
+impl<'a, 'b, T: Reflectable> Deref<JSRef<'b, T>> for Root<'a, 'b, T> {
+    fn deref<'c>(&'c self) -> &'c JSRef<'b, T> {
+        &self.jsref
+    }
+}
+
+impl<'a, 'b, T: Reflectable> DerefMut<JSRef<'b, T>> for Root<'a, 'b, T> {
+    fn deref_mut<'c>(&'c mut self) -> &'c mut JSRef<'b, T> {
+        &mut self.jsref
+    }
+}
+
+impl<'a, T: Reflectable> Deref<T> for JSRef<'a, T> {
+    fn deref<'b>(&'b self) -> &'b T {
+        let borrow = self.ptr.borrow();
+        unsafe {
+            &**borrow
+        }
+    }
+}
+
+impl<'a, T: Reflectable> DerefMut<T> for JSRef<'a, T> {
+    fn deref_mut<'b>(&'b mut self) -> &'b mut T {
+        let mut borrowed = self.ptr.borrow_mut();
+        unsafe {
+            &mut **borrowed
+        }
+    }
+}
+
+/// Encapsulates a reference to something that is guaranteed to be alive. This is freely copyable.
+pub struct JSRef<'a, T> {
+    ptr: RefCell<*mut T>,
+    chain: &'a (),
+}
+
+impl<'a, T> Clone for JSRef<'a, T> {
+    fn clone(&self) -> JSRef<'a, T> {
+        JSRef {
+            ptr: self.ptr.clone(),
+            chain: self.chain
+        }
+    }
+}
+
+impl<'a, T> Eq for JSRef<'a, T> {
+    fn eq(&self, other: &JSRef<T>) -> bool {
+        self.ptr == other.ptr
+    }
+}
+
+impl<'a,T> JSRef<'a,T> {
+    //XXXjdm It would be lovely if this could be private.
+    pub unsafe fn transmute<'b, To>(&'b self) -> &'b JSRef<'a, To> {
+        cast::transmute(self)
+    }
+
+    //XXXjdm It would be lovely if this could be private.
+    pub unsafe fn transmute_mut<'b, To>(&'b mut self) -> &'b mut JSRef<'a, To> {
+        cast::transmute(self)
+    }
+
+    pub fn unrooted(&self) -> JS<T> {
+        JS {
+            ptr: self.ptr.clone()
+        }
+    }
+}
+
+impl<'a, T: Reflectable> Reflectable for JSRef<'a, T> {
+    fn reflector<'a>(&'a self) -> &'a Reflector {
+        self.deref().reflector()
+    }
+
+    fn mut_reflector<'a>(&'a mut self) -> &'a mut Reflector {
+        self.deref_mut().mut_reflector()
+    }
+}

src/components/script/dom/bindings/trace.rs

@@ -6,6 +6,7 @@ use dom::bindings::js::JS;
 use dom::bindings::utils::{Reflectable, Reflector};
 
 use js::jsapi::{JSObject, JSTracer, JS_CallTracer, JSTRACE_OBJECT};
+use js::jsval::JSVal;
 
 use libc;
 use std::cast;
@@ -42,6 +43,22 @@ pub trait JSTraceable {
     fn trace(&self, trc: *mut JSTracer);
 }
 
+pub fn trace_jsval(tracer: *mut JSTracer, description: &str, val: JSVal) {
+    if !val.is_gcthing() {
+        return;
+    }
+
+    unsafe {
+        description.to_c_str().with_ref(|name| {
+            (*tracer).debugPrinter = ptr::null();
+            (*tracer).debugPrintIndex = -1;
+            (*tracer).debugPrintArg = name as *libc::c_void;
+            debug!("tracing value {:s}", description);
+            JS_CallTracer(tracer as *JSTracer, val.to_gcthing(), val.trace_kind());
+        });
+    }
+}
+
 pub fn trace_reflector(tracer: *mut JSTracer, description: &str, reflector: &Reflector) {
     trace_object(tracer, description, reflector.get_jsobject())
 }
@@ -132,3 +149,10 @@ impl<S: Encoder<E>, E> Encodable<S, E> for Traceable<*JSObject> {
         Ok(())
     }
 }
+
+impl<S: Encoder<E>, E> Encodable<S, E> for Traceable<JSVal> {
+    fn encode(&self, s: &mut S) -> Result<(), E> {
+        trace_jsval(get_jstracer(s), "val", **self);
+        Ok(())
+    }
+}

src/components/script/dom/bindings/utils.rs

@@ -5,7 +5,7 @@
 use dom::bindings::codegen::PrototypeList;
 use dom::bindings::codegen::PrototypeList::MAX_PROTO_CHAIN_LENGTH;
 use dom::bindings::conversions::{FromJSValConvertible, IDLInterface};
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Temporary, Root};
 use dom::bindings::trace::Untraceable;
 use dom::browsercontext;
 use dom::window;
@@ -37,7 +37,6 @@ use js::jsapi::{JSContext, JSObject, JSBool, jsid, JSClass, JSNative};
 use js::jsapi::{JSFunctionSpec, JSPropertySpec};
 use js::jsapi::{JS_NewGlobalObject, JS_InitStandardClasses};
 use js::jsapi::{JSString};
-use js::jsapi::{JS_AllowGC, JS_InhibitGC};
 use js::jsfriendapi::bindgen::JS_NewObjectWithUniqueType;
 use js::jsval::JSVal;
 use js::jsval::{PrivateValue, ObjectValue, NullValue, ObjectOrNullValue};
@@ -390,10 +389,10 @@ pub trait Reflectable {
 
 pub fn reflect_dom_object<T: Reflectable>
         (obj:     ~T,
-         window:  &JS<window::Window>,
-         wrap_fn: extern "Rust" fn(*JSContext, &JS<window::Window>, ~T) -> JS<T>)
-         ->       JS<T> {
-    JS::new(obj, window, wrap_fn)
+         window:  &JSRef<window::Window>,
+         wrap_fn: extern "Rust" fn(*JSContext, &JSRef<window::Window>, ~T) -> JS<T>)
+         -> Temporary<T> {
+    Temporary::new(wrap_fn(window.deref().get_cx(), window, obj))
 }
 
 #[deriving(Eq)]
@@ -413,6 +412,13 @@ impl Reflector {
         self.object = object;
     }
 
+    /// Return a pointer to the memory location at which the JS reflector object is stored.
+    /// Used by Temporary values to root the reflector, as required by the JSAPI rooting
+    /// APIs.
+    pub fn rootable<'a>(&'a self) -> &'a *JSObject {
+        &self.object
+    }
+
     pub fn new() -> Reflector {
         Reflector {
             object: ptr::null(),
@@ -605,11 +611,13 @@ pub extern fn outerize_global(_cx: *JSContext, obj: JSHandleObject) -> *JSObject
     unsafe {
         debug!("outerizing");
         let obj = *obj.unnamed;
-        let win: JS<window::Window> =
+        let win: Root<window::Window> =
             unwrap_jsmanaged(obj,
                              IDLInterface::get_prototype_id(None::<window::Window>),
-                             IDLInterface::get_prototype_depth(None::<window::Window>)).unwrap();
-        win.get().browser_context.get_ref().window_proxy()
+                             IDLInterface::get_prototype_depth(None::<window::Window>))
+            .unwrap()
+            .root();
+        win.deref().browser_context.get_ref().window_proxy()
     }
 }
 
@@ -625,8 +633,8 @@ pub fn global_object_for_js_object(obj: *JSObject) -> JS<window::Window> {
 }
 
 fn cx_for_dom_reflector(obj: *JSObject) -> *JSContext {
-    let win = global_object_for_js_object(obj);
-    let js_info = win.get().page().js_info();
+    let win = global_object_for_js_object(obj).root();
+    let js_info = win.deref().page().js_info();
     match *js_info {
         Some(ref info) => info.js_context.deref().deref().ptr,
         None => fail!("no JS context for DOM global")
@@ -637,26 +645,6 @@ pub fn cx_for_dom_object<T: Reflectable>(obj: &T) -> *JSContext {
     cx_for_dom_reflector(obj.reflector().get_jsobject())
 }
 
-/// Execute arbitrary code with the JS GC enabled, then disable it afterwards.
-pub fn with_gc_enabled<R>(cx: *JSContext, f: || -> R) -> R {
-    unsafe {
-        JS_AllowGC(cx);
-        let rv = f();
-        JS_InhibitGC(cx);
-        rv
-    }
-}
-
-/// Execute arbitrary code with the JS GC disabled, then enable it afterwards.
-pub fn with_gc_disabled<R>(cx: *JSContext, f: || -> R) -> R {
-    unsafe {
-        JS_InhibitGC(cx);
-        let rv = f();
-        JS_AllowGC(cx);
-        rv
-    }
-}
-
 /// Check if an element name is valid. See http://www.w3.org/TR/xml/#NT-Name
 /// for details.
 #[deriving(Eq)]

src/components/script/dom/blob.rs

@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Temporary};
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
 use dom::bindings::error::Fallible;
 use dom::bindings::codegen::BindingDeclarations::BlobBinding;
@@ -16,38 +16,46 @@ pub struct Blob {
 }
 
 impl Blob {
-    pub fn new_inherited(window: JS<Window>) -> Blob {
+    pub fn new_inherited(window: &JSRef<Window>) -> Blob {
         Blob {
             reflector_: Reflector::new(),
-            window: window
+            window: window.unrooted()
         }
     }
 
-    pub fn new(window: &JS<Window>) -> JS<Blob> {
-        reflect_dom_object(~Blob::new_inherited(window.clone()),
+    pub fn new(window: &JSRef<Window>) -> Temporary<Blob> {
+        reflect_dom_object(~Blob::new_inherited(window),
                            window,
                            BlobBinding::Wrap)
     }
-}
 
-impl Blob {
-    pub fn Constructor(window: &JS<Window>) -> Fallible<JS<Blob>> {
+    pub fn Constructor(window: &JSRef<Window>) -> Fallible<Temporary<Blob>> {
         Ok(Blob::new(window))
     }
+}
 
-    pub fn Size(&self) -> u64 {
+pub trait BlobMethods {
+    fn Size(&self) -> u64;
+    fn Type(&self) -> DOMString;
+    fn Slice(&self, _start: Option<i64>, _end: Option<i64>, _contentType: Option<DOMString>) -> Temporary<Blob>;
+    fn Close(&self);
+}
+
+impl<'a> BlobMethods for JSRef<'a, Blob> {
+    fn Size(&self) -> u64 {
         0
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn Slice(&self, _start: Option<i64>, _end: Option<i64>, _contentType: Option<DOMString>) -> JS<Blob> {
-        Blob::new(&self.window)
+    fn Slice(&self, _start: Option<i64>, _end: Option<i64>, _contentType: Option<DOMString>) -> Temporary<Blob> {
+        let window = self.window.root();
+        Blob::new(&window.root_ref())
     }
 
-    pub fn Close(&self) {}
+    fn Close(&self) {}
 }
 
 impl Reflectable for Blob {

src/components/script/dom/browsercontext.rs

@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Temporary};
 use dom::bindings::trace::Traceable;
 use dom::bindings::utils::Reflectable;
 use dom::document::Document;
@@ -22,7 +22,7 @@ pub struct BrowserContext {
 }
 
 impl BrowserContext {
-    pub fn new(document: &JS<Document>) -> BrowserContext {
+    pub fn new(document: &JSRef<Document>) -> BrowserContext {
         let mut context = BrowserContext {
             history: vec!(SessionHistoryEntry::new(document)),
             active_index: 0,
@@ -32,13 +32,13 @@ impl BrowserContext {
         context
     }
 
-    pub fn active_document(&self) -> JS<Document> {
-        self.history.get(self.active_index).document.clone()
+    pub fn active_document(&self) -> Temporary<Document> {
+        Temporary::new(self.history.get(self.active_index).document.clone())
     }
 
-    pub fn active_window(&self) -> JS<Window> {
-        let doc = self.active_document();
-        doc.get().window.clone()
+    pub fn active_window(&self) -> Temporary<Window> {
+        let doc = self.active_document().root();
+        Temporary::new(doc.deref().window.clone())
     }
 
     pub fn window_proxy(&self) -> *JSObject {
@@ -47,14 +47,14 @@ impl BrowserContext {
     }
 
     pub fn create_window_proxy(&self) -> *JSObject {
-        let win = self.active_window();
-        let page = win.get().page();
+        let win = self.active_window().root();
+        let page = win.deref().page();
         let js_info = page.js_info();
 
         let handler = js_info.get_ref().dom_static.windowproxy_handler;
         assert!(handler.deref().is_not_null());
 
-        let parent = win.get().reflector().get_jsobject();
+        let parent = win.deref().reflector().get_jsobject();
         let cx = js_info.get_ref().js_context.deref().deref().ptr;
         let wrapper = unsafe {
             WrapperNew(cx, parent, *handler.deref())
@@ -71,9 +71,9 @@ pub struct SessionHistoryEntry {
 }
 
 impl SessionHistoryEntry {
-    fn new(document: &JS<Document>) -> SessionHistoryEntry {
+    fn new(document: &JSRef<Document>) -> SessionHistoryEntry {
         SessionHistoryEntry {
-            document: document.clone(),
+            document: document.unrooted(),
             children: vec!()
         }
     }

src/components/script/dom/characterdata.rs

@@ -5,7 +5,7 @@
 //! DOM bindings for `CharacterData`.
 
 use dom::bindings::codegen::InheritTypes::CharacterDataDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::JSRef;
 use dom::bindings::error::{Fallible, ErrorResult, IndexSize};
 use dom::bindings::utils::{Reflectable, Reflector};
 use dom::document::Document;
@@ -31,44 +31,57 @@ impl CharacterDataDerived for EventTarget {
 }
 
 impl CharacterData {
-    pub fn new_inherited(id: NodeTypeId, data: DOMString, document: JS<Document>) -> CharacterData {
+    pub fn new_inherited(id: NodeTypeId, data: DOMString, document: &JSRef<Document>) -> CharacterData {
         CharacterData {
             node: Node::new_inherited(id, document),
             data: data
         }
     }
+}
 
-    pub fn Data(&self) -> DOMString {
+pub trait CharacterDataMethods {
+    fn Data(&self) -> DOMString;
+    fn SetData(&mut self, arg: DOMString) -> ErrorResult;
+    fn Length(&self) -> u32;
+    fn SubstringData(&self, offset: u32, count: u32) -> Fallible<DOMString>;
+    fn AppendData(&mut self, arg: DOMString) -> ErrorResult;
+    fn InsertData(&mut self, _offset: u32, _arg: DOMString) -> ErrorResult;
+    fn DeleteData(&mut self, _offset: u32, _count: u32) -> ErrorResult;
+    fn ReplaceData(&mut self, _offset: u32, _count: u32, _arg: DOMString) -> ErrorResult;
+}
+
+impl<'a> CharacterDataMethods for JSRef<'a, CharacterData> {
+    fn Data(&self) -> DOMString {
         self.data.clone()
     }
 
-    pub fn SetData(&mut self, arg: DOMString) -> ErrorResult {
+    fn SetData(&mut self, arg: DOMString) -> ErrorResult {
         self.data = arg;
         Ok(())
     }
 
-    pub fn Length(&self) -> u32 {
+    fn Length(&self) -> u32 {
         self.data.len() as u32
     }
 
-    pub fn SubstringData(&self, offset: u32, count: u32) -> Fallible<DOMString> {
+    fn SubstringData(&self, offset: u32, count: u32) -> Fallible<DOMString> {
         Ok(self.data.slice(offset as uint, count as uint).to_str())
     }
 
-    pub fn AppendData(&mut self, arg: DOMString) -> ErrorResult {
+    fn AppendData(&mut self, arg: DOMString) -> ErrorResult {
         self.data.push_str(arg);
         Ok(())
     }
 
-    pub fn InsertData(&mut self, offset: u32, arg: DOMString) -> ErrorResult {
+    fn InsertData(&mut self, offset: u32, arg: DOMString) -> ErrorResult {
         self.ReplaceData(offset, 0, arg)
     }
 
-    pub fn DeleteData(&mut self, offset: u32, count: u32) -> ErrorResult {
+    fn DeleteData(&mut self, offset: u32, count: u32) -> ErrorResult {
         self.ReplaceData(offset, count, ~"")
     }
 
-    pub fn ReplaceData(&mut self, offset: u32, count: u32, arg: DOMString) -> ErrorResult {
+    fn ReplaceData(&mut self, offset: u32, count: u32, arg: DOMString) -> ErrorResult {
         let length = self.data.len() as u32;
         if offset > length {
             return Err(IndexSize);

src/components/script/dom/clientrect.rs

@@ -3,7 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use dom::bindings::codegen::BindingDeclarations::ClientRectBinding;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Temporary};
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
 use dom::window::Window;
 use servo_util::geometry::Au;
@@ -19,7 +19,7 @@ pub struct ClientRect {
 }
 
 impl ClientRect {
-    pub fn new_inherited(window: JS<Window>,
+    pub fn new_inherited(window: &JSRef<Window>,
                          top: Au, bottom: Au,
                          left: Au, right: Au) -> ClientRect {
         ClientRect {
@@ -28,39 +28,49 @@ impl ClientRect {
             left: left.to_nearest_px() as f32,
             right: right.to_nearest_px() as f32,
             reflector_: Reflector::new(),
-            window: window,
+            window: window.unrooted(),
         }
     }
 
-    pub fn new(window: &JS<Window>,
+    pub fn new(window: &JSRef<Window>,
                top: Au, bottom: Au,
-               left: Au, right: Au) -> JS<ClientRect> {
-        let rect = ClientRect::new_inherited(window.clone(), top, bottom, left, right);
+               left: Au, right: Au) -> Temporary<ClientRect> {
+        let rect = ClientRect::new_inherited(window, top, bottom, left, right);
         reflect_dom_object(~rect, window, ClientRectBinding::Wrap)
     }
+}
 
+pub trait ClientRectMethods {
+    fn Top(&self) -> f32;
+    fn Bottom(&self) -> f32;
+    fn Left(&self) -> f32;
+    fn Right(&self) -> f32;
+    fn Width(&self) -> f32;
+    fn Height(&self) -> f32;
+}
 
-    pub fn Top(&self) -> f32 {
+impl<'a> ClientRectMethods for JSRef<'a, ClientRect> {
+    fn Top(&self) -> f32 {
         self.top
     }
 
-    pub fn Bottom(&self) -> f32 {
+    fn Bottom(&self) -> f32 {
         self.bottom
     }
 
-    pub fn Left(&self) -> f32 {
+    fn Left(&self) -> f32 {
         self.left
     }
 
-    pub fn Right(&self) -> f32 {
+    fn Right(&self) -> f32 {
         self.right
     }
 
-    pub fn Width(&self) -> f32 {
+    fn Width(&self) -> f32 {
         (self.right - self.left).abs()
     }
 
-    pub fn Height(&self) -> f32 {
+    fn Height(&self) -> f32 {
         (self.bottom - self.top).abs()
     }
 }

src/components/script/dom/clientrectlist.rs

@@ -3,7 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use dom::bindings::codegen::BindingDeclarations::ClientRectListBinding;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Temporary};
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
 use dom::clientrect::ClientRect;
 use dom::window::Window;
@@ -16,34 +16,42 @@ pub struct ClientRectList {
 }
 
 impl ClientRectList {
-    pub fn new_inherited(window: JS<Window>,
-                         rects: Vec<JS<ClientRect>>) -> ClientRectList {
+    pub fn new_inherited(window: &JSRef<Window>,
+                         rects: Vec<JSRef<ClientRect>>) -> ClientRectList {
         ClientRectList {
             reflector_: Reflector::new(),
-            rects: rects,
-            window: window,
+            rects: rects.iter().map(|rect| rect.unrooted()).collect(),
+            window: window.unrooted(),
         }
     }
 
-    pub fn new(window: &JS<Window>,
-               rects: Vec<JS<ClientRect>>) -> JS<ClientRectList> {
-        reflect_dom_object(~ClientRectList::new_inherited(window.clone(), rects),
+    pub fn new(window: &JSRef<Window>,
+               rects: Vec<JSRef<ClientRect>>) -> Temporary<ClientRectList> {
+        reflect_dom_object(~ClientRectList::new_inherited(window, rects),
                            window, ClientRectListBinding::Wrap)
     }
+}
 
-    pub fn Length(&self) -> u32 {
+pub trait ClientRectListMethods {
+    fn Length(&self) -> u32;
+    fn Item(&self, index: u32) -> Option<Temporary<ClientRect>>;
+    fn IndexedGetter(&self, index: u32, found: &mut bool) -> Option<Temporary<ClientRect>>;
+}
+
+impl<'a> ClientRectListMethods for JSRef<'a, ClientRectList> {
+    fn Length(&self) -> u32 {
         self.rects.len() as u32
     }
 
-    pub fn Item(&self, index: u32) -> Option<JS<ClientRect>> {
+    fn Item(&self, index: u32) -> Option<Temporary<ClientRect>> {
         if index < self.rects.len() as u32 {
-            Some(self.rects.get(index as uint).clone())
+            Some(Temporary::new(self.rects.get(index as uint).clone()))
         } else {
             None
         }
     }
 
-    pub fn IndexedGetter(&self, index: u32, found: &mut bool) -> Option<JS<ClientRect>> {
+    fn IndexedGetter(&self, index: u32, found: &mut bool) -> Option<Temporary<ClientRect>> {
         *found = index < self.rects.len() as u32;
         self.Item(index)
     }

src/components/script/dom/comment.rs

@@ -4,13 +4,13 @@
 
 use dom::bindings::codegen::InheritTypes::CommentDerived;
 use dom::bindings::codegen::BindingDeclarations::CommentBinding;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::Fallible;
 use dom::characterdata::CharacterData;
 use dom::document::Document;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
 use dom::node::{CommentNodeTypeId, Node};
-use dom::window::Window;
+use dom::window::{Window, WindowMethods};
 use servo_util::str::DOMString;
 
 /// An HTML comment.
@@ -29,18 +29,22 @@ impl CommentDerived for EventTarget {
 }
 
 impl Comment {
-    pub fn new_inherited(text: DOMString, document: JS<Document>) -> Comment {
+    pub fn new_inherited(text: DOMString, document: &JSRef<Document>) -> Comment {
         Comment {
             characterdata: CharacterData::new_inherited(CommentNodeTypeId, text, document)
         }
     }
 
-    pub fn new(text: DOMString, document: &JS<Document>) -> JS<Comment> {
-        let node = Comment::new_inherited(text, document.clone());
+    pub fn new(text: DOMString, document: &JSRef<Document>) -> Temporary<Comment> {
+        let node = Comment::new_inherited(text, document);
         Node::reflect_node(~node, document, CommentBinding::Wrap)
     }
 
-    pub fn Constructor(owner: &JS<Window>, data: DOMString) -> Fallible<JS<Comment>> {
-        Ok(Comment::new(data, &owner.get().Document()))
+    pub fn Constructor(owner: &JSRef<Window>, data: DOMString) -> Fallible<Temporary<Comment>> {
+        let document = owner.Document().root();
+        Ok(Comment::new(data, &*document))
     }
 }
+
+pub trait CommentMethods {
+}

src/components/script/dom/console.rs

@@ -3,7 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use dom::bindings::codegen::BindingDeclarations::ConsoleBinding;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
 use dom::window::Window;
 use servo_util::str::DOMString;
@@ -20,27 +20,37 @@ impl Console {
         }
     }
 
-    pub fn new(window: &JS<Window>) -> JS<Console> {
+    pub fn new(window: &JSRef<Window>) -> Temporary<Console> {
         reflect_dom_object(~Console::new_inherited(), window, ConsoleBinding::Wrap)
     }
+}
 
-    pub fn Log(&self, message: DOMString) {
+pub trait ConsoleMethods {
+    fn Log(&self, message: DOMString);
+    fn Debug(&self, message: DOMString);
+    fn Info(&self, message: DOMString);
+    fn Warn(&self, message: DOMString);
+    fn Error(&self, message: DOMString);
+}
+
+impl<'a> ConsoleMethods for JSRef<'a, Console> {
+    fn Log(&self, message: DOMString) {
         println!("{:s}", message);
     }
 
-    pub fn Debug(&self, message: DOMString) {
+    fn Debug(&self, message: DOMString) {
         println!("{:s}", message);
     }
 
-    pub fn Info(&self, message: DOMString) {
+    fn Info(&self, message: DOMString) {
         println!("{:s}", message);
     }
 
-    pub fn Warn(&self, message: DOMString) {
+    fn Warn(&self, message: DOMString) {
         println!("{:s}", message);
     }
 
-    pub fn Error(&self, message: DOMString) {
+    fn Error(&self, message: DOMString) {
         println!("{:s}", message);
     }
 }

src/components/script/dom/document.rs

@@ -3,11 +3,11 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use dom::bindings::codegen::InheritTypes::{DocumentDerived, EventCast, HTMLElementCast};
-use dom::bindings::codegen::InheritTypes::{DocumentBase, NodeCast, DocumentCast};
 use dom::bindings::codegen::InheritTypes::{HTMLHeadElementCast, TextCast, ElementCast};
-use dom::bindings::codegen::InheritTypes::{DocumentTypeCast, HTMLHtmlElementCast};
+use dom::bindings::codegen::InheritTypes::{DocumentTypeCast, HTMLHtmlElementCast, NodeCast};
 use dom::bindings::codegen::BindingDeclarations::DocumentBinding;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Temporary, OptionalSettable, TemporaryPushable};
+use dom::bindings::js::OptionalRootable;
 use dom::bindings::trace::Untraceable;
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
 use dom::bindings::error::{ErrorResult, Fallible, NotSupported, InvalidCharacter, HierarchyRequest, NamespaceError};
@@ -22,18 +22,18 @@ use dom::element::{HTMLBodyElementTypeId, HTMLFrameSetElementTypeId};
 use dom::event::Event;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
 use dom::htmlcollection::{HTMLCollection, CollectionFilter};
-use dom::nodelist::NodeList;
 use dom::htmlelement::HTMLElement;
 use dom::htmlheadelement::HTMLHeadElement;
 use dom::htmlhtmlelement::HTMLHtmlElement;
 use dom::htmltitleelement::HTMLTitleElement;
 use dom::mouseevent::MouseEvent;
-use dom::node::{Node, ElementNodeTypeId, DocumentNodeTypeId, NodeHelpers, INode};
+use dom::node::{Node, ElementNodeTypeId, DocumentNodeTypeId, NodeHelpers, NodeMethods};
 use dom::node::{CloneChildren, DoNotCloneChildren};
+use dom::nodelist::NodeList;
 use dom::text::Text;
 use dom::processinginstruction::ProcessingInstruction;
 use dom::uievent::UIEvent;
-use dom::window::Window;
+use dom::window::{Window, WindowMethods};
 use dom::location::Location;
 use html::hubbub_html_parser::build_element_from_tag;
 use hubbub::hubbub::{QuirksMode, NoQuirks, LimitedQuirks, FullQuirks};
@@ -76,23 +76,127 @@ impl DocumentDerived for EventTarget {
     }
 }
 
-impl Document {
-    pub fn reflect_document<D: Reflectable+DocumentBase>
-            (document:  ~D,
-             window:    &JS<Window>,
-             wrap_fn:   extern "Rust" fn(*JSContext, &JS<Window>, ~D) -> JS<D>)
-             -> JS<D> {
-        assert!(document.reflector().get_jsobject().is_null());
-        let raw_doc = reflect_dom_object(document, window, wrap_fn);
-        assert!(raw_doc.reflector().get_jsobject().is_not_null());
+pub trait DocumentHelpers {
+    fn url<'a>(&'a self) -> &'a Url;
+    fn quirks_mode(&self) -> QuirksMode;
+    fn set_quirks_mode(&mut self, mode: QuirksMode);
+    fn set_encoding_name(&mut self, name: DOMString);
+    fn content_changed(&self);
+    fn damage_and_reflow(&self, damage: DocumentDamageLevel);
+    fn wait_until_safe_to_modify_dom(&self);
+    fn unregister_named_element(&mut self, to_unregister: &JSRef<Element>, id: DOMString);
+    fn register_named_element(&mut self, element: &JSRef<Element>, id: DOMString);
+}
 
-        let document = DocumentCast::from(&raw_doc);
-        let mut node: JS<Node> = NodeCast::from(&document);
-        node.get_mut().set_owner_doc(&document);
-        raw_doc
+impl<'a> DocumentHelpers for JSRef<'a, Document> {
+    fn url<'a>(&'a self) -> &'a Url {
+        &*self.url
     }
 
-    pub fn new_inherited(window: JS<Window>,
+    fn quirks_mode(&self) -> QuirksMode {
+        *self.quirks_mode
+    }
+
+    fn set_quirks_mode(&mut self, mode: QuirksMode) {
+        *self.quirks_mode = mode;
+    }
+
+    fn set_encoding_name(&mut self, name: DOMString) {
+        self.encoding_name = name;
+    }
+
+    fn content_changed(&self) {
+        self.damage_and_reflow(ContentChangedDocumentDamage);
+    }
+
+    fn damage_and_reflow(&self, damage: DocumentDamageLevel) {
+        self.window.root().damage_and_reflow(damage);
+    }
+
+    fn wait_until_safe_to_modify_dom(&self) {
+        self.window.root().wait_until_safe_to_modify_dom();
+    }
+
+
+    /// Remove any existing association between the provided id and any elements in this document.
+    fn unregister_named_element(&mut self,
+                                to_unregister: &JSRef<Element>,
+                                id: DOMString) {
+        let mut is_empty = false;
+        match self.idmap.find_mut(&id) {
+            None => {},
+            Some(elements) => {
+                let position = elements.iter()
+                                       .map(|elem| elem.root())
+                                       .position(|element| &*element == to_unregister)
+                                       .expect("This element should be in registered.");
+                elements.remove(position);
+                is_empty = elements.is_empty();
+            }
+        }
+        if is_empty {
+            self.idmap.remove(&id);
+        }
+    }
+
+    /// Associate an element present in this document with the provided id.
+    fn register_named_element(&mut self,
+                              element: &JSRef<Element>,
+                              id: DOMString) {
+        assert!({
+            let node: &JSRef<Node> = NodeCast::from_ref(element);
+            node.is_in_doc()
+        });
+
+        // FIXME https://github.com/mozilla/rust/issues/13195
+        //       Use mangle() when it exists again.
+        let root = self.GetDocumentElement().expect("The element is in the document, so there must be a document element.").root();
+        match self.idmap.find_mut(&id) {
+            Some(elements) => {
+                let new_node: &JSRef<Node> = NodeCast::from_ref(element);
+                let mut head : uint = 0u;
+                let root: &JSRef<Node> = NodeCast::from_ref(&*root);
+                for node in root.traverse_preorder() {
+                    let elem: Option<&JSRef<Element>> = ElementCast::to_ref(&node);
+                    match elem {
+                        Some(elem) => {
+                            if &*elements.get(head).root() == elem {
+                                head = head + 1;
+                            }
+                            if new_node == &node || head == elements.len() {
+                                break;
+                            }
+                        }
+                        None => {}
+                    }
+                }
+                elements.insert_unrooted(head, element);
+                return;
+            },
+            None => (),
+        }
+        let mut elements = vec!();
+        elements.push_unrooted(element);
+        self.idmap.insert(id, elements);
+    }
+}
+
+impl Document {
+    pub fn reflect_document(document: ~Document,
+                            window: &JSRef<Window>,
+                            wrap_fn: extern "Rust" fn(*JSContext, &JSRef<Window>, ~Document) -> JS<Document>)
+             -> Temporary<Document> {
+        assert!(document.reflector().get_jsobject().is_null());
+        let mut raw_doc = reflect_dom_object(document, window, wrap_fn).root();
+        assert!(raw_doc.reflector().get_jsobject().is_not_null());
+
+        let mut doc_alias = raw_doc.clone();
+        let node: &mut JSRef<Node> = NodeCast::from_mut_ref(&mut doc_alias);
+        node.set_owner_doc(&*raw_doc);
+        Temporary::from_rooted(&*raw_doc)
+    }
+
+    pub fn new_inherited(window: &JSRef<Window>,
                          url: Option<Url>,
                          is_html_document: IsHTMLDocument,
                          content_type: Option<DOMString>) -> Document {
@@ -101,7 +205,7 @@ impl Document {
         Document {
             node: Node::new_without_doc(DocumentNodeTypeId),
             reflector_: Reflector::new(),
-            window: window,
+            window: window.unrooted(),
             idmap: HashMap::new(),
             implementation: None,
             content_type: match content_type {
@@ -122,23 +226,15 @@ impl Document {
         }
     }
 
-    pub fn new(window: &JS<Window>, url: Option<Url>, doctype: IsHTMLDocument, content_type: Option<DOMString>) -> JS<Document> {
-        let document = Document::new_inherited(window.clone(), url, doctype, content_type);
-        Document::reflect_document(~document, window, DocumentBinding::Wrap)
-    }
-}
-
-impl Document {
-    pub fn url<'a>(&'a self) -> &'a Url {
-        &*self.url
-    }
-}
-
-impl Document {
     // http://dom.spec.whatwg.org/#dom-document
-    pub fn Constructor(owner: &JS<Window>) -> Fallible<JS<Document>> {
+    pub fn Constructor(owner: &JSRef<Window>) -> Fallible<Temporary<Document>> {
         Ok(Document::new(owner, None, NonHTMLDocument, None))
     }
+
+    pub fn new(window: &JSRef<Window>, url: Option<Url>, doctype: IsHTMLDocument, content_type: Option<DOMString>) -> Temporary<Document> {
+        let document = Document::new_inherited(window, url, doctype, content_type);
+        Document::reflect_document(~document, window, DocumentBinding::Wrap)
+    }
 }
 
 impl Reflectable for Document {
@@ -151,108 +247,183 @@ impl Reflectable for Document {
     }
 }
 
-impl Document {
-    // http://dom.spec.whatwg.org/#dom-document-implementation
-    pub fn Implementation(&mut self) -> JS<DOMImplementation> {
-        if self.implementation.is_none() {
-            self.implementation = Some(DOMImplementation::new(&self.window));
+trait PrivateDocumentHelpers {
+    fn createNodeList(&self, callback: |node: &JSRef<Node>| -> bool) -> Temporary<NodeList>;
+    fn get_html_element(&self) -> Option<Temporary<HTMLHtmlElement>>;
+}
+
+impl<'a> PrivateDocumentHelpers for JSRef<'a, Document> {
+    fn createNodeList(&self, callback: |node: &JSRef<Node>| -> bool) -> Temporary<NodeList> {
+        let window = self.window.root();
+
+        match self.GetDocumentElement().root() {
+            None => {
+                NodeList::new_simple_list(&*window, vec!())
+            },
+            Some(root) => {
+                let mut nodes = vec!();
+                let root: &JSRef<Node> = NodeCast::from_ref(&*root);
+                for child in root.traverse_preorder() {
+                    if callback(&child) {
+                        nodes.push(child);
+                    }
+                }
+                NodeList::new_simple_list(&*window, nodes)
+            }
         }
-        self.implementation.get_ref().clone()
+
+    }
+
+    fn get_html_element(&self) -> Option<Temporary<HTMLHtmlElement>> {
+        self.GetDocumentElement().root().filtered(|root| {
+            root.node.type_id == ElementNodeTypeId(HTMLHtmlElementTypeId)
+        }).map(|elem| {
+            Temporary::from_rooted(HTMLHtmlElementCast::to_ref(&*elem).unwrap())
+        })
+    }
+}
+
+pub trait DocumentMethods {
+    fn Implementation(&mut self) -> Temporary<DOMImplementation>;
+    fn URL(&self) -> DOMString;
+    fn DocumentURI(&self) -> DOMString;
+    fn CompatMode(&self) -> DOMString;
+    fn CharacterSet(&self) -> DOMString;
+    fn ContentType(&self) -> DOMString;
+    fn GetDoctype(&self) -> Option<Temporary<DocumentType>>;
+    fn GetDocumentElement(&self) -> Option<Temporary<Element>>;
+    fn GetElementsByTagName(&self, tag_name: DOMString) -> Temporary<HTMLCollection>;
+    fn GetElementsByTagNameNS(&self, maybe_ns: Option<DOMString>, tag_name: DOMString) -> Temporary<HTMLCollection>;
+    fn GetElementsByClassName(&self, classes: DOMString) -> Temporary<HTMLCollection>;
+    fn GetElementById(&self, id: DOMString) -> Option<Temporary<Element>>;
+    fn CreateElement(&self, local_name: DOMString) -> Fallible<Temporary<Element>>;
+    fn CreateElementNS(&self, namespace: Option<DOMString>, qualified_name: DOMString) -> Fallible<Temporary<Element>>;
+    fn CreateDocumentFragment(&self) -> Temporary<DocumentFragment>;
+    fn CreateTextNode(&self, data: DOMString) -> Temporary<Text>;
+    fn CreateComment(&self, data: DOMString) -> Temporary<Comment>;
+    fn CreateProcessingInstruction(&self, target: DOMString, data: DOMString) -> Fallible<Temporary<ProcessingInstruction>>;
+    fn ImportNode(&self, node: &JSRef<Node>, deep: bool) -> Fallible<Temporary<Node>>;
+    fn AdoptNode(&self, node: &mut JSRef<Node>) -> Fallible<Temporary<Node>>;
+    fn CreateEvent(&self, interface: DOMString) -> Fallible<Temporary<Event>>;
+    fn Title(&self) -> DOMString;
+    fn SetTitle(&self, title: DOMString) -> ErrorResult;
+    fn GetHead(&self) -> Option<Temporary<HTMLHeadElement>>;
+    fn GetBody(&self) -> Option<Temporary<HTMLElement>>;
+    fn SetBody(&self, new_body: Option<JSRef<HTMLElement>>) -> ErrorResult;
+    fn GetElementsByName(&self, name: DOMString) -> Temporary<NodeList>;
+    fn Images(&self) -> Temporary<HTMLCollection>;
+    fn Embeds(&self) -> Temporary<HTMLCollection>;
+    fn Plugins(&self) -> Temporary<HTMLCollection>;
+    fn Links(&self) -> Temporary<HTMLCollection>;
+    fn Forms(&self) -> Temporary<HTMLCollection>;
+    fn Scripts(&self) -> Temporary<HTMLCollection>;
+    fn Anchors(&self) -> Temporary<HTMLCollection>;
+    fn Applets(&self) -> Temporary<HTMLCollection>;
+    fn Location(&mut self) -> Temporary<Location>;
+    fn Children(&self) -> Temporary<HTMLCollection>;
+}
+
+impl<'a> DocumentMethods for JSRef<'a, Document> {
+    // http://dom.spec.whatwg.org/#dom-document-implementation
+    fn Implementation(&mut self) -> Temporary<DOMImplementation> {
+        if self.implementation.is_none() {
+            let window = self.window.root();
+            self.implementation.assign(Some(DOMImplementation::new(&*window)));
+        }
+        Temporary::new(self.implementation.get_ref().clone())
     }
 
     // http://dom.spec.whatwg.org/#dom-document-url
-    pub fn URL(&self) -> DOMString {
+    fn URL(&self) -> DOMString {
         self.url().to_str()
     }
 
     // http://dom.spec.whatwg.org/#dom-document-documenturi
-    pub fn DocumentURI(&self) -> DOMString {
+    fn DocumentURI(&self) -> DOMString {
         self.URL()
     }
 
     // http://dom.spec.whatwg.org/#dom-document-compatmode
-    pub fn CompatMode(&self) -> DOMString {
+    fn CompatMode(&self) -> DOMString {
         match *self.quirks_mode {
             NoQuirks => ~"CSS1Compat",
             LimitedQuirks | FullQuirks => ~"BackCompat"
         }
     }
 
-    pub fn quirks_mode(&self) -> QuirksMode {
-        *self.quirks_mode
-    }
-
-    pub fn set_quirks_mode(&mut self, mode: QuirksMode) {
-        *self.quirks_mode = mode;
-    }
-
     // http://dom.spec.whatwg.org/#dom-document-characterset
-    pub fn CharacterSet(&self) -> DOMString {
+    fn CharacterSet(&self) -> DOMString {
         self.encoding_name.to_ascii_lower()
     }
 
-    pub fn set_encoding_name(&mut self, name: DOMString) {
-        self.encoding_name = name;
-    }
-
     // http://dom.spec.whatwg.org/#dom-document-content_type
-    pub fn ContentType(&self) -> DOMString {
+    fn ContentType(&self) -> DOMString {
         self.content_type.clone()
     }
 
     // http://dom.spec.whatwg.org/#dom-document-doctype
-    pub fn GetDoctype(&self) -> Option<JS<DocumentType>> {
-        self.node.children().find(|child| child.is_doctype())
-                            .map(|node| DocumentTypeCast::to(&node).unwrap())
+    fn GetDoctype(&self) -> Option<Temporary<DocumentType>> {
+        let node: &JSRef<Node> = NodeCast::from_ref(self);
+        node.children().find(|child| {
+            child.is_doctype()
+        }).map(|node| {
+            let doctype: &JSRef<DocumentType> = DocumentTypeCast::to_ref(&node).unwrap();
+            Temporary::from_rooted(doctype)
+        })
     }
 
     // http://dom.spec.whatwg.org/#dom-document-documentelement
-    pub fn GetDocumentElement(&self) -> Option<JS<Element>> {
-        self.node.child_elements().next()
+    fn GetDocumentElement(&self) -> Option<Temporary<Element>> {
+        let node: &JSRef<Node> = NodeCast::from_ref(self);
+        node.child_elements().next().map(|elem| Temporary::from_rooted(&elem))
     }
 
     // http://dom.spec.whatwg.org/#dom-document-getelementsbytagname
-    pub fn GetElementsByTagName(&self, abstract_self: &JS<Document>, tag_name: DOMString) -> JS<HTMLCollection> {
-        HTMLCollection::by_tag_name(&self.window, &NodeCast::from(abstract_self), tag_name)
+    fn GetElementsByTagName(&self, tag_name: DOMString) -> Temporary<HTMLCollection> {
+        let window = self.window.root();
+        HTMLCollection::by_tag_name(&*window, NodeCast::from_ref(self), tag_name)
     }
 
     // http://dom.spec.whatwg.org/#dom-document-getelementsbytagnamens
-    pub fn GetElementsByTagNameNS(&self, abstract_self: &JS<Document>, maybe_ns: Option<DOMString>, tag_name: DOMString) -> JS<HTMLCollection> {
+    fn GetElementsByTagNameNS(&self, maybe_ns: Option<DOMString>, tag_name: DOMString) -> Temporary<HTMLCollection> {
+        let window = self.window.root();
+
         let namespace = match maybe_ns {
             Some(namespace) => Namespace::from_str(namespace),
             None => Null
         };
-        HTMLCollection::by_tag_name_ns(&self.window, &NodeCast::from(abstract_self), tag_name, namespace)
+        HTMLCollection::by_tag_name_ns(&*window, NodeCast::from_ref(self), tag_name, namespace)
     }
 
     // http://dom.spec.whatwg.org/#dom-document-getelementsbyclassname
-    pub fn GetElementsByClassName(&self, abstract_self: &JS<Document>, classes: DOMString) -> JS<HTMLCollection> {
-        HTMLCollection::by_class_name(&self.window, &NodeCast::from(abstract_self), classes)
+    fn GetElementsByClassName(&self, classes: DOMString) -> Temporary<HTMLCollection> {
+        let window = self.window.root();
+
+        HTMLCollection::by_class_name(&*window, NodeCast::from_ref(self), classes)
     }
 
     // http://dom.spec.whatwg.org/#dom-nonelementparentnode-getelementbyid
-    pub fn GetElementById(&self, id: DOMString) -> Option<JS<Element>> {
+    fn GetElementById(&self, id: DOMString) -> Option<Temporary<Element>> {
         match self.idmap.find_equiv(&id) {
             None => None,
-            Some(ref elements) => Some(elements.get(0).clone()),
+            Some(ref elements) => Some(Temporary::new(elements.get(0).clone())),
         }
     }
 
     // http://dom.spec.whatwg.org/#dom-document-createelement
-    pub fn CreateElement(&self, abstract_self: &JS<Document>, local_name: DOMString)
-                         -> Fallible<JS<Element>> {
+    fn CreateElement(&self, local_name: DOMString) -> Fallible<Temporary<Element>> {
         if xml_name_type(local_name) == InvalidXMLName {
             debug!("Not a valid element name");
             return Err(InvalidCharacter);
         }
         let local_name = local_name.to_ascii_lower();
-        Ok(build_element_from_tag(local_name, abstract_self))
+        Ok(build_element_from_tag(local_name, self))
     }
 
     // http://dom.spec.whatwg.org/#dom-document-createelementns
-    pub fn CreateElementNS(&self, abstract_self: &JS<Document>,
-                           namespace: Option<DOMString>,
-                           qualified_name: DOMString) -> Fallible<JS<Element>> {
+    fn CreateElementNS(&self,
+                       namespace: Option<DOMString>,
+                       qualified_name: DOMString) -> Fallible<Temporary<Element>> {
         let ns = Namespace::from_str(null_str_as_empty_ref(&namespace));
         match xml_name_type(qualified_name) {
             InvalidXMLName => {
@@ -289,31 +460,31 @@ impl Document {
         }
 
         if ns == namespace::HTML {
-            Ok(build_element_from_tag(local_name_from_qname, abstract_self))
+            Ok(build_element_from_tag(local_name_from_qname, self))
         } else {
-            Ok(Element::new(local_name_from_qname, ns, prefix_from_qname, abstract_self))
+            Ok(Element::new(local_name_from_qname, ns, prefix_from_qname, self))
         }
     }
 
     // http://dom.spec.whatwg.org/#dom-document-createdocumentfragment
-    pub fn CreateDocumentFragment(&self, abstract_self: &JS<Document>) -> JS<DocumentFragment> {
-        DocumentFragment::new(abstract_self)
+    fn CreateDocumentFragment(&self) -> Temporary<DocumentFragment> {
+        DocumentFragment::new(self)
     }
 
     // http://dom.spec.whatwg.org/#dom-document-createtextnode
-    pub fn CreateTextNode(&self, abstract_self: &JS<Document>, data: DOMString)
-                          -> JS<Text> {
-        Text::new(data, abstract_self)
+    fn CreateTextNode(&self, data: DOMString)
+                          -> Temporary<Text> {
+        Text::new(data, self)
     }
 
     // http://dom.spec.whatwg.org/#dom-document-createcomment
-    pub fn CreateComment(&self, abstract_self: &JS<Document>, data: DOMString) -> JS<Comment> {
-        Comment::new(data, abstract_self)
+    fn CreateComment(&self, data: DOMString) -> Temporary<Comment> {
+        Comment::new(data, self)
     }
 
     // http://dom.spec.whatwg.org/#dom-document-createprocessinginstruction
-    pub fn CreateProcessingInstruction(&self, abstract_self: &JS<Document>, target: DOMString,
-                                       data: DOMString) -> Fallible<JS<ProcessingInstruction>> {
+    fn CreateProcessingInstruction(&self, target: DOMString,
+                                       data: DOMString) -> Fallible<Temporary<ProcessingInstruction>> {
         // Step 1.
         if xml_name_type(target) == InvalidXMLName {
             return Err(InvalidCharacter);
@@ -325,11 +496,11 @@ impl Document {
         }
 
         // Step 3.
-        Ok(ProcessingInstruction::new(target, data, abstract_self))
+        Ok(ProcessingInstruction::new(target, data, self))
     }
 
     // http://dom.spec.whatwg.org/#dom-document-importnode
-    pub fn ImportNode(&self, abstract_self: &JS<Document>, node: &JS<Node>, deep: bool) -> Fallible<JS<Node>> {
+    fn ImportNode(&self, node: &JSRef<Node>, deep: bool) -> Fallible<Temporary<Node>> {
         // Step 1.
         if node.is_document() {
             return Err(NotSupported);
@@ -341,47 +512,48 @@ impl Document {
             false => DoNotCloneChildren
         };
 
-        Ok(Node::clone(node, Some(abstract_self), clone_children))
+        Ok(Node::clone(node, Some(self), clone_children))
     }
 
     // http://dom.spec.whatwg.org/#dom-document-adoptnode
-    pub fn AdoptNode(&self, abstract_self: &JS<Document>, node: &JS<Node>) -> Fallible<JS<Node>> {
+    fn AdoptNode(&self, node: &mut JSRef<Node>) -> Fallible<Temporary<Node>> {
         // Step 1.
         if node.is_document() {
             return Err(NotSupported);
         }
 
         // Step 2.
-        let mut adoptee = node.clone();
-        Node::adopt(&mut adoptee, abstract_self);
+        Node::adopt(node, self);
 
         // Step 3.
-        Ok(adoptee)
+        Ok(Temporary::from_rooted(node))
     }
 
     // http://dom.spec.whatwg.org/#dom-document-createevent
-    pub fn CreateEvent(&self, interface: DOMString) -> Fallible<JS<Event>> {
+    fn CreateEvent(&self, interface: DOMString) -> Fallible<Temporary<Event>> {
+        let window = self.window.root();
+
         match interface.to_ascii_lower().as_slice() {
             // FIXME: Implement CustomEvent (http://dom.spec.whatwg.org/#customevent)
-            "uievents" | "uievent" => Ok(EventCast::from(&UIEvent::new(&self.window))),
-            "mouseevents" | "mouseevent" => Ok(EventCast::from(&MouseEvent::new(&self.window))),
-            "htmlevents" | "events" | "event" => Ok(Event::new(&self.window)),
+            "uievents" | "uievent" => Ok(EventCast::from_unrooted(UIEvent::new(&*window))),
+            "mouseevents" | "mouseevent" => Ok(EventCast::from_unrooted(MouseEvent::new(&*window))),
+            "htmlevents" | "events" | "event" => Ok(Event::new(&*window)),
             _ => Err(NotSupported)
         }
     }
 
     // http://www.whatwg.org/specs/web-apps/current-work/#document.title
-    pub fn Title(&self, _: &JS<Document>) -> DOMString {
+    fn Title(&self) -> DOMString {
         let mut title = ~"";
-        self.GetDocumentElement().map(|root| {
-            let root: JS<Node> = NodeCast::from(&root);
+        self.GetDocumentElement().root().map(|root| {
+            let root: &JSRef<Node> = NodeCast::from_ref(&*root);
             root.traverse_preorder()
                 .find(|node| node.type_id() == ElementNodeTypeId(HTMLTitleElementTypeId))
                 .map(|title_elem| {
                     for child in title_elem.children() {
                         if child.is_text() {
-                            let text: JS<Text> = TextCast::to(&child).unwrap();
-                            title.push_str(text.get().characterdata.data.as_slice());
+                            let text: &JSRef<Text> = TextCast::to_ref(&child).unwrap();
+                            title.push_str(text.deref().characterdata.data.as_slice());
                         }
                     }
                 });
@@ -392,15 +564,15 @@ impl Document {
     }
 
     // http://www.whatwg.org/specs/web-apps/current-work/#document.title
-    pub fn SetTitle(&self, abstract_self: &JS<Document>, title: DOMString) -> ErrorResult {
-        self.GetDocumentElement().map(|root| {
-            let root: JS<Node> = NodeCast::from(&root);
+    fn SetTitle(&self, title: DOMString) -> ErrorResult {
+        self.GetDocumentElement().root().map(|root| {
+            let root: &JSRef<Node> = NodeCast::from_ref(&*root);
             let mut head_node = root.traverse_preorder().find(|child| {
-                child.get().type_id == ElementNodeTypeId(HTMLHeadElementTypeId)
+                child.type_id() == ElementNodeTypeId(HTMLHeadElementTypeId)
             });
             head_node.as_mut().map(|head| {
                 let mut title_node = head.children().find(|child| {
-                    child.get().type_id == ElementNodeTypeId(HTMLTitleElementTypeId)
+                    child.type_id() == ElementNodeTypeId(HTMLTitleElementTypeId)
                 });
 
                 match title_node {
@@ -408,15 +580,18 @@ impl Document {
                         for mut title_child in title_node.children() {
                             assert!(title_node.RemoveChild(&mut title_child).is_ok());
                         }
-                        let new_text = self.CreateTextNode(abstract_self, title.clone());
-                        assert!(title_node.AppendChild(&mut NodeCast::from(&new_text)).is_ok());
+                        let mut new_text = self.CreateTextNode(title.clone()).root();
+
+                        assert!(title_node.AppendChild(NodeCast::from_mut_ref(&mut *new_text)).is_ok());
                     },
                     None => {
-                        let mut new_title: JS<Node> =
-                            NodeCast::from(&HTMLTitleElement::new(~"title", abstract_self));
-                        let new_text = self.CreateTextNode(abstract_self, title.clone());
-                        assert!(new_title.AppendChild(&mut NodeCast::from(&new_text)).is_ok());
-                        assert!(head.AppendChild(&mut new_title).is_ok());
+                        let mut new_title = HTMLTitleElement::new(~"title", self).root();
+                        let new_title: &mut JSRef<Node> = NodeCast::from_mut_ref(&mut *new_title);
+
+                        let mut new_text = self.CreateTextNode(title.clone()).root();
+
+                        assert!(new_title.AppendChild(NodeCast::from_mut_ref(&mut *new_text)).is_ok());
+                        assert!(head.AppendChild(&mut *new_title).is_ok());
                     },
                 }
             });
@@ -424,42 +599,43 @@ impl Document {
         Ok(())
     }
 
-    fn get_html_element(&self) -> Option<JS<HTMLHtmlElement>> {
-        self.GetDocumentElement().filtered(|root| {
-            root.get().node.type_id == ElementNodeTypeId(HTMLHtmlElementTypeId)
-        }).map(|elem| HTMLHtmlElementCast::to(&elem).unwrap())
-    }
-
     // http://www.whatwg.org/specs/web-apps/current-work/#dom-document-head
-    pub fn GetHead(&self) -> Option<JS<HTMLHeadElement>> {
+    fn GetHead(&self) -> Option<Temporary<HTMLHeadElement>> {
         self.get_html_element().and_then(|root| {
-            let node: JS<Node> = NodeCast::from(&root);
+            let root = root.root();
+            let node: &JSRef<Node> = NodeCast::from_ref(&*root);
             node.children().find(|child| {
                 child.type_id() == ElementNodeTypeId(HTMLHeadElementTypeId)
-            }).map(|node| HTMLHeadElementCast::to(&node).unwrap())
+            }).map(|node| {
+                Temporary::from_rooted(HTMLHeadElementCast::to_ref(&node).unwrap())
+            })
         })
     }
 
     // http://www.whatwg.org/specs/web-apps/current-work/#dom-document-body
-    pub fn GetBody(&self, _: &JS<Document>) -> Option<JS<HTMLElement>> {
+    fn GetBody(&self) -> Option<Temporary<HTMLElement>> {
         self.get_html_element().and_then(|root| {
-            let node: JS<Node> = NodeCast::from(&root);
+            let root = root.root();
+            let node: &JSRef<Node> = NodeCast::from_ref(&*root);
             node.children().find(|child| {
                 match child.type_id() {
                     ElementNodeTypeId(HTMLBodyElementTypeId) |
                     ElementNodeTypeId(HTMLFrameSetElementTypeId) => true,
                     _ => false
                 }
-            }).map(|node| HTMLElementCast::to(&node).unwrap())
+            }).map(|node| {
+                Temporary::from_rooted(HTMLElementCast::to_ref(&node).unwrap())
+            })
         })
     }
 
     // http://www.whatwg.org/specs/web-apps/current-work/#dom-document-body
-    pub fn SetBody(&self, abstract_self: &JS<Document>, new_body: Option<JS<HTMLElement>>) -> ErrorResult {
+    fn SetBody(&self, new_body: Option<JSRef<HTMLElement>>) -> ErrorResult {
         // Step 1.
         match new_body {
-            Some(ref node) => {
-                match node.get().element.node.type_id {
+            Some(ref htmlelem) => {
+                let node: &JSRef<Node> = NodeCast::from_ref(htmlelem);
+                match node.type_id() {
                     ElementNodeTypeId(HTMLBodyElementTypeId) | ElementNodeTypeId(HTMLFrameSetElementTypeId) => {}
                     _ => return Err(HierarchyRequest)
                 }
@@ -468,24 +644,28 @@ impl Document {
         }
 
         // Step 2.
-        let old_body: Option<JS<HTMLElement>> = self.GetBody(abstract_self);
-        if old_body == new_body {
+        let mut old_body = self.GetBody().root();
+        //FIXME: covariant lifetime workaround. do not judge.
+        if old_body.as_ref().map(|body| body.deref()) == new_body.as_ref().map(|a| &*a) {
             return Ok(());
         }
 
         // Step 3.
-        match self.get_html_element() {
+        match self.get_html_element().root() {
             // Step 4.
             None => return Err(HierarchyRequest),
-            Some(root) => {
-                let mut new_body: JS<Node> = NodeCast::from(&new_body.unwrap());
-                let mut root: JS<Node> = NodeCast::from(&root);
+            Some(ref mut root) => {
+                let mut new_body_unwrapped = new_body.unwrap();
+                let new_body: &mut JSRef<Node> = NodeCast::from_mut_ref(&mut new_body_unwrapped);
+
+                let root: &mut JSRef<Node> = NodeCast::from_mut_ref(&mut **root);
                 match old_body {
-                    Some(child) => {
-                        let mut child: JS<Node> = NodeCast::from(&child);
-                        assert!(root.ReplaceChild(&mut new_body, &mut child).is_ok())
+                    Some(ref mut child) => {
+                        let child: &mut JSRef<Node> = NodeCast::from_mut_ref(&mut **child);
+
+                        assert!(root.ReplaceChild(new_body, child).is_ok())
                     }
-                    None => assert!(root.AppendChild(&mut new_body).is_ok())
+                    None => assert!(root.AppendChild(new_body).is_ok())
                 };
             }
         }
@@ -493,204 +673,130 @@ impl Document {
     }
 
     // http://www.whatwg.org/specs/web-apps/current-work/#dom-document-getelementsbyname
-    pub fn GetElementsByName(&self, name: DOMString) -> JS<NodeList> {
+    fn GetElementsByName(&self, name: DOMString) -> Temporary<NodeList> {
         self.createNodeList(|node| {
             if !node.is_element() {
                 return false;
             }
 
-            let element: JS<Element> = ElementCast::to(node).unwrap();
-            element.get_attribute(Null, "name").map_or(false, |attr| {
-                attr.get().value_ref() == name
+            let element: &JSRef<Element> = ElementCast::to_ref(node).unwrap();
+            element.get_attribute(Null, "name").root().map_or(false, |mut attr| {
+                attr.value_ref() == name
             })
         })
     }
 
-    pub fn Images(&self, abstract_self: &JS<Document>) -> JS<HTMLCollection> {
+    fn Images(&self) -> Temporary<HTMLCollection> {
+        let window = self.window.root();
+
         // FIXME: https://github.com/mozilla/servo/issues/1847
         struct ImagesFilter;
         impl CollectionFilter for ImagesFilter {
-            fn filter(&self, elem: &JS<Element>, _root: &JS<Node>) -> bool {
-                elem.get().local_name == ~"img"
+            fn filter(&self, elem: &JSRef<Element>, _root: &JSRef<Node>) -> bool {
+                elem.deref().local_name == ~"img"
             }
         }
         let filter = ~ImagesFilter;
-        HTMLCollection::create(&self.window, &NodeCast::from(abstract_self), filter)
+        HTMLCollection::create(&*window, NodeCast::from_ref(self), filter)
     }
 
-    pub fn Embeds(&self, abstract_self: &JS<Document>) -> JS<HTMLCollection> {
+    fn Embeds(&self) -> Temporary<HTMLCollection> {
+        let window = self.window.root();
+
         // FIXME: https://github.com/mozilla/servo/issues/1847
         struct EmbedsFilter;
         impl CollectionFilter for EmbedsFilter {
-            fn filter(&self, elem: &JS<Element>, _root: &JS<Node>) -> bool {
-                elem.get().local_name == ~"embed"
+            fn filter(&self, elem: &JSRef<Element>, _root: &JSRef<Node>) -> bool {
+                elem.deref().local_name == ~"embed"
             }
         }
         let filter = ~EmbedsFilter;
-        HTMLCollection::create(&self.window, &NodeCast::from(abstract_self), filter)
+        HTMLCollection::create(&*window, NodeCast::from_ref(self), filter)
     }
 
-    pub fn Plugins(&self, abstract_self: &JS<Document>) -> JS<HTMLCollection> {
+    fn Plugins(&self) -> Temporary<HTMLCollection> {
         // FIXME: https://github.com/mozilla/servo/issues/1847
-        self.Embeds(abstract_self)
+        self.Embeds()
     }
 
-    pub fn Links(&self, abstract_self: &JS<Document>) -> JS<HTMLCollection> {
+    fn Links(&self) -> Temporary<HTMLCollection> {
+        let window = self.window.root();
+
         // FIXME: https://github.com/mozilla/servo/issues/1847
         struct LinksFilter;
         impl CollectionFilter for LinksFilter {
-            fn filter(&self, elem: &JS<Element>, _root: &JS<Node>) -> bool {
-                (elem.get().local_name == ~"a" || elem.get().local_name == ~"area") &&
+            fn filter(&self, elem: &JSRef<Element>, _root: &JSRef<Node>) -> bool {
+                (elem.deref().local_name == ~"a" || elem.deref().local_name == ~"area") &&
                 elem.get_attribute(Null, "href").is_some()
             }
         }
         let filter = ~LinksFilter;
-        HTMLCollection::create(&self.window, &NodeCast::from(abstract_self), filter)
+        HTMLCollection::create(&*window, NodeCast::from_ref(self), filter)
     }
 
-    pub fn Forms(&self, abstract_self: &JS<Document>) -> JS<HTMLCollection> {
+    fn Forms(&self) -> Temporary<HTMLCollection> {
+        let window = self.window.root();
+
         // FIXME: https://github.com/mozilla/servo/issues/1847
         struct FormsFilter;
         impl CollectionFilter for FormsFilter {
-            fn filter(&self, elem: &JS<Element>, _root: &JS<Node>) -> bool {
-                elem.get().local_name == ~"form"
+            fn filter(&self, elem: &JSRef<Element>, _root: &JSRef<Node>) -> bool {
+                elem.deref().local_name == ~"form"
             }
         }
         let filter = ~FormsFilter;
-        HTMLCollection::create(&self.window, &NodeCast::from(abstract_self), filter)
+        HTMLCollection::create(&*window, NodeCast::from_ref(self), filter)
     }
 
-    pub fn Scripts(&self, abstract_self: &JS<Document>) -> JS<HTMLCollection> {
+    fn Scripts(&self) -> Temporary<HTMLCollection> {
+        let window = self.window.root();
+
         // FIXME: https://github.com/mozilla/servo/issues/1847
         struct ScriptsFilter;
         impl CollectionFilter for ScriptsFilter {
-            fn filter(&self, elem: &JS<Element>, _root: &JS<Node>) -> bool {
-                elem.get().local_name == ~"script"
+            fn filter(&self, elem: &JSRef<Element>, _root: &JSRef<Node>) -> bool {
+                elem.deref().local_name == ~"script"
             }
         }
         let filter = ~ScriptsFilter;
-        HTMLCollection::create(&self.window, &NodeCast::from(abstract_self), filter)
+        HTMLCollection::create(&*window, NodeCast::from_ref(self), filter)
     }
 
-    pub fn Anchors(&self, abstract_self: &JS<Document>) -> JS<HTMLCollection> {
+    fn Anchors(&self) -> Temporary<HTMLCollection> {
+        let window = self.window.root();
+
         // FIXME: https://github.com/mozilla/servo/issues/1847
         struct AnchorsFilter;
         impl CollectionFilter for AnchorsFilter {
-            fn filter(&self, elem: &JS<Element>, _root: &JS<Node>) -> bool {
-                elem.get().local_name == ~"a" && elem.get_attribute(Null, "name").is_some()
+            fn filter(&self, elem: &JSRef<Element>, _root: &JSRef<Node>) -> bool {
+                elem.deref().local_name == ~"a" && elem.get_attribute(Null, "name").is_some()
             }
         }
         let filter = ~AnchorsFilter;
-        HTMLCollection::create(&self.window, &NodeCast::from(abstract_self), filter)
+        HTMLCollection::create(&*window, NodeCast::from_ref(self), filter)
     }
 
-    pub fn Applets(&self, abstract_self: &JS<Document>) -> JS<HTMLCollection> {
+    fn Applets(&self) -> Temporary<HTMLCollection> {
+        let window = self.window.root();
+
         // FIXME: This should be return OBJECT elements containing applets.
         struct AppletsFilter;
         impl CollectionFilter for AppletsFilter {
-            fn filter(&self, elem: &JS<Element>, _root: &JS<Node>) -> bool {
-                elem.get().local_name == ~"applet"
+            fn filter(&self, elem: &JSRef<Element>, _root: &JSRef<Node>) -> bool {
+                elem.deref().local_name == ~"applet"
             }
         }
         let filter = ~AppletsFilter;
-        HTMLCollection::create(&self.window, &NodeCast::from(abstract_self), filter)
+        HTMLCollection::create(&*window, NodeCast::from_ref(self), filter)
     }
 
-    pub fn Location(&mut self, abstract_self: &JS<Document>) -> JS<Location> {
-        self.window.get_mut().Location(&abstract_self.get().window)
+    fn Location(&mut self) -> Temporary<Location> {
+        let mut window = self.window.root();
+        window.Location()
     }
 
-    pub fn Children(&self, abstract_self: &JS<Document>) -> JS<HTMLCollection> {
-        let doc = self.node.owner_doc();
-        let doc = doc.get();
-        HTMLCollection::children(&doc.window, &NodeCast::from(abstract_self))
-    }
-
-    pub fn createNodeList(&self, callback: |node: &JS<Node>| -> bool) -> JS<NodeList> {
-        let mut nodes = vec!();
-        match self.GetDocumentElement() {
-            None => {},
-            Some(root) => {
-                let root: JS<Node> = NodeCast::from(&root);
-                for child in root.traverse_preorder() {
-                    if callback(&child) {
-                        nodes.push(child.clone());
-                    }
-                }
-            }
-        }
-
-        NodeList::new_simple_list(&self.window, nodes)
-    }
-
-    pub fn content_changed(&self) {
-        self.damage_and_reflow(ContentChangedDocumentDamage);
-    }
-
-    pub fn damage_and_reflow(&self, damage: DocumentDamageLevel) {
-        self.window.get().damage_and_reflow(damage);
-    }
-
-    pub fn wait_until_safe_to_modify_dom(&self) {
-        self.window.get().wait_until_safe_to_modify_dom();
-    }
-
-
-    /// Remove any existing association between the provided id and any elements in this document.
-    pub fn unregister_named_element(&mut self,
-                                    abstract_self: &JS<Element>,
-                                    id: DOMString) {
-        let mut is_empty = false;
-        match self.idmap.find_mut(&id) {
-            None => {},
-            Some(elements) => {
-                let position = elements.iter()
-                                       .position(|element| element == abstract_self)
-                                       .expect("This element should be in registered.");
-                elements.remove(position);
-                is_empty = elements.is_empty();
-            }
-        }
-        if is_empty {
-            self.idmap.remove(&id);
-        }
-    }
-
-    /// Associate an element present in this document with the provided id.
-    pub fn register_named_element(&mut self,
-                                  element: &JS<Element>,
-                                  id: DOMString) {
-        assert!({
-            let node: JS<Node> = NodeCast::from(element);
-            node.is_in_doc()
-        });
-
-        // FIXME https://github.com/mozilla/rust/issues/13195
-        //       Use mangle() when it exists again.
-        let root = self.GetDocumentElement().expect("The element is in the document, so there must be a document element.");
-        match self.idmap.find_mut(&id) {
-            Some(elements) => {
-                let new_node = NodeCast::from(element);
-                let mut head : uint = 0u;
-                let root: JS<Node> = NodeCast::from(&root);
-                for node in root.traverse_preorder() {
-                    match ElementCast::to(&node) {
-                        Some(elem) => {
-                            if elements.get(head) == &elem {
-                                head = head + 1;
-                            }
-                            if new_node == node || head == elements.len() {
-                                break;
-                            }
-                        }
-                        None => {}
-                    }
-                }
-                elements.insert(head, element.clone());
-                return;
-            },
-            None => (),
-        }
-        self.idmap.insert(id, vec!(element.clone()));
+    fn Children(&self) -> Temporary<HTMLCollection> {
+        let window = self.window.root();
+        HTMLCollection::children(&*window, NodeCast::from_ref(self))
     }
 }

src/components/script/dom/documentfragment.rs

@@ -4,13 +4,13 @@
 
 use dom::bindings::codegen::InheritTypes::{DocumentFragmentDerived, NodeCast};
 use dom::bindings::codegen::BindingDeclarations::DocumentFragmentBinding;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::Fallible;
 use dom::document::Document;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
 use dom::htmlcollection::HTMLCollection;
-use dom::node::{DocumentFragmentNodeTypeId, Node};
-use dom::window::Window;
+use dom::node::{DocumentFragmentNodeTypeId, Node, window_from_node};
+use dom::window::{Window, WindowMethods};
 
 #[deriving(Encodable)]
 pub struct DocumentFragment {
@@ -28,28 +28,32 @@ impl DocumentFragmentDerived for EventTarget {
 
 impl DocumentFragment {
     /// Creates a new DocumentFragment.
-    pub fn new_inherited(document: JS<Document>) -> DocumentFragment {
+    pub fn new_inherited(document: &JSRef<Document>) -> DocumentFragment {
         DocumentFragment {
             node: Node::new_inherited(DocumentFragmentNodeTypeId, document),
         }
     }
 
-    pub fn new(document: &JS<Document>) -> JS<DocumentFragment> {
-        let node = DocumentFragment::new_inherited(document.clone());
+    pub fn new(document: &JSRef<Document>) -> Temporary<DocumentFragment> {
+        let node = DocumentFragment::new_inherited(document);
         Node::reflect_node(~node, document, DocumentFragmentBinding::Wrap)
     }
-}
 
-impl DocumentFragment {
-    pub fn Constructor(owner: &JS<Window>) -> Fallible<JS<DocumentFragment>> {
-        Ok(DocumentFragment::new(&owner.get().Document()))
+    pub fn Constructor(owner: &JSRef<Window>) -> Fallible<Temporary<DocumentFragment>> {
+        let document = owner.Document();
+        let document = document.root();
+
+        Ok(DocumentFragment::new(&document.root_ref()))
     }
 }
 
-impl DocumentFragment {
-    pub fn Children(&self, abstract_self: &JS<DocumentFragment>) -> JS<HTMLCollection> {
-        let doc = self.node.owner_doc();
-        let doc = doc.get();
-        HTMLCollection::children(&doc.window, &NodeCast::from(abstract_self))
+pub trait DocumentFragmentMethods {
+    fn Children(&self) -> Temporary<HTMLCollection>;
+}
+
+impl<'a> DocumentFragmentMethods for JSRef<'a, DocumentFragment> {
+    fn Children(&self) -> Temporary<HTMLCollection> {
+        let window = window_from_node(self).root();
+        HTMLCollection::children(&window.root_ref(), NodeCast::from_ref(self))
     }
 }

src/components/script/dom/documenttype.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::InheritTypes::DocumentTypeDerived;
 use dom::bindings::codegen::BindingDeclarations::DocumentTypeBinding;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
 use dom::node::{Node, DoctypeNodeTypeId};
@@ -32,7 +32,7 @@ impl DocumentType {
     pub fn new_inherited(name: DOMString,
                          public_id: Option<DOMString>,
                          system_id: Option<DOMString>,
-                         document: JS<Document>)
+                         document: &JSRef<Document>)
             -> DocumentType {
         DocumentType {
             node: Node::new_inherited(DoctypeNodeTypeId, document),
@@ -45,26 +45,32 @@ impl DocumentType {
     pub fn new(name: DOMString,
                public_id: Option<DOMString>,
                system_id: Option<DOMString>,
-               document: &JS<Document>)
-               -> JS<DocumentType> {
+               document: &JSRef<Document>)
+               -> Temporary<DocumentType> {
         let documenttype = DocumentType::new_inherited(name,
                                                        public_id,
                                                        system_id,
-                                                       document.clone());
+                                                       document);
         Node::reflect_node(~documenttype, document, DocumentTypeBinding::Wrap)
     }
 }
 
-impl DocumentType {
-    pub fn Name(&self) -> DOMString {
+pub trait DocumentTypeMethods {
+    fn Name(&self) -> DOMString;
+    fn PublicId(&self) -> DOMString;
+    fn SystemId(&self) -> DOMString;
+}
+
+impl<'a> DocumentTypeMethods for JSRef<'a, DocumentType> {
+    fn Name(&self) -> DOMString {
         self.name.clone()
     }
 
-    pub fn PublicId(&self) -> DOMString {
+    fn PublicId(&self) -> DOMString {
         self.public_id.clone()
     }
 
-    pub fn SystemId(&self) -> DOMString {
+    fn SystemId(&self) -> DOMString {
         self.system_id.clone()
     }
 }

src/components/script/dom/domexception.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::DOMExceptionBinding;
 use dom::bindings::codegen::BindingDeclarations::DOMExceptionBinding::DOMExceptionConstants;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
 use dom::window::Window;
 use servo_util::str::DOMString;
@@ -49,7 +49,7 @@ impl DOMException {
         }
     }
 
-    pub fn new(window: &JS<Window>, code: DOMErrorName) -> JS<DOMException> {
+    pub fn new(window: &JSRef<Window>, code: DOMErrorName) -> Temporary<DOMException> {
         reflect_dom_object(~DOMException::new_inherited(code), window, DOMExceptionBinding::Wrap)
     }
 }
@@ -64,9 +64,15 @@ impl Reflectable for DOMException {
     }
 }
 
-impl DOMException {
+pub trait DOMExceptionMethods {
+    fn Code(&self) -> u16;
+    fn Name(&self) -> DOMString;
+    fn Message(&self) -> DOMString;
+}
+
+impl<'a> DOMExceptionMethods for JSRef<'a, DOMException> {
     // http://dom.spec.whatwg.org/#dom-domexception-code
-    pub fn Code(&self) -> u16 {
+    fn Code(&self) -> u16 {
         match self.code {
             // http://dom.spec.whatwg.org/#concept-throw
             EncodingError => 0,
@@ -75,12 +81,12 @@ impl DOMException {
     }
 
     // http://dom.spec.whatwg.org/#error-names-0
-    pub fn Name(&self) -> DOMString {
+    fn Name(&self) -> DOMString {
         self.code.to_str()
     }
 
     // http://dom.spec.whatwg.org/#error-names-0
-    pub fn Message(&self) -> DOMString {
+    fn Message(&self) -> DOMString {
         match self.code {
             IndexSizeError => ~"The index is not in the allowed range.",
             HierarchyRequestError => ~"The operation would yield an incorrect node tree.",

src/components/script/dom/domimplementation.rs

@@ -4,19 +4,19 @@
 
 use dom::bindings::codegen::BindingDeclarations::DOMImplementationBinding;
 use dom::bindings::codegen::InheritTypes::NodeCast;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Temporary, OptionalRootable};
 use dom::bindings::utils::{Reflector, Reflectable, reflect_dom_object};
 use dom::bindings::error::{Fallible, InvalidCharacter, NamespaceError};
 use dom::bindings::utils::{QName, Name, InvalidXMLName, xml_name_type};
-use dom::document::{Document, HTMLDocument, NonHTMLDocument};
+use dom::document::{Document, HTMLDocument, NonHTMLDocument, DocumentMethods};
 use dom::documenttype::DocumentType;
 use dom::htmlbodyelement::HTMLBodyElement;
 use dom::htmlheadelement::HTMLHeadElement;
 use dom::htmlhtmlelement::HTMLHtmlElement;
 use dom::htmltitleelement::HTMLTitleElement;
-use dom::node::{Node, INode};
+use dom::node::{Node, NodeMethods};
 use dom::text::Text;
-use dom::window::Window;
+use dom::window::{Window, WindowMethods};
 use servo_util::str::DOMString;
 
 #[deriving(Encodable)]
@@ -26,15 +26,15 @@ pub struct DOMImplementation {
 }
 
 impl DOMImplementation {
-    pub fn new_inherited(owner: JS<Window>) -> DOMImplementation {
+    pub fn new_inherited(owner: &JSRef<Window>) -> DOMImplementation {
         DOMImplementation {
-            owner: owner,
+            owner: owner.unrooted(),
             reflector_: Reflector::new(),
         }
     }
 
-    pub fn new(owner: &JS<Window>) -> JS<DOMImplementation> {
-        reflect_dom_object(~DOMImplementation::new_inherited(owner.clone()), owner,
+    pub fn new(owner: &JSRef<Window>) -> Temporary<DOMImplementation> {
+        reflect_dom_object(~DOMImplementation::new_inherited(owner), owner,
                            DOMImplementationBinding::Wrap)
     }
 }
@@ -49,102 +49,124 @@ impl Reflectable for DOMImplementation {
     }
 }
 
+pub trait DOMImplementationMethods {
+    fn CreateDocumentType(&self, qname: DOMString, pubid: DOMString, sysid: DOMString) -> Fallible<Temporary<DocumentType>>;
+    fn CreateDocument(&self, namespace: Option<DOMString>, qname: DOMString,
+                      mut maybe_doctype: Option<JSRef<DocumentType>>) -> Fallible<Temporary<Document>>;
+    fn CreateHTMLDocument(&self, title: Option<DOMString>) -> Temporary<Document>;
+}
+
 // http://dom.spec.whatwg.org/#domimplementation
-impl DOMImplementation {
+impl<'a> DOMImplementationMethods for JSRef<'a, DOMImplementation> {
     // http://dom.spec.whatwg.org/#dom-domimplementation-createdocumenttype
-    pub fn CreateDocumentType(&self, qname: DOMString, pubid: DOMString, sysid: DOMString) -> Fallible<JS<DocumentType>> {
+    fn CreateDocumentType(&self, qname: DOMString, pubid: DOMString, sysid: DOMString) -> Fallible<Temporary<DocumentType>> {
         match xml_name_type(qname) {
             // Step 1.
             InvalidXMLName => Err(InvalidCharacter),
             // Step 2.
             Name => Err(NamespaceError),
             // Step 3.
-            QName => Ok(DocumentType::new(qname, Some(pubid), Some(sysid), &self.owner.get().Document()))
+            QName => {
+                let owner = self.owner.root();
+                let document = owner.deref().Document().root();
+                Ok(DocumentType::new(qname, Some(pubid), Some(sysid), &*document))
+            }
         }
     }
 
     // http://dom.spec.whatwg.org/#dom-domimplementation-createdocument
-    pub fn CreateDocument(&self, namespace: Option<DOMString>, qname: DOMString,
-                          maybe_doctype: Option<JS<DocumentType>>) -> Fallible<JS<Document>> {
-        // Step 1.
-        let doc = Document::new(&self.owner, None, NonHTMLDocument, None);
-        let mut doc_node: JS<Node> = NodeCast::from(&doc);
+    fn CreateDocument(&self, namespace: Option<DOMString>, qname: DOMString,
+                      mut maybe_doctype: Option<JSRef<DocumentType>>) -> Fallible<Temporary<Document>> {
+        let win = self.owner.root();
 
+        // Step 1.
+        let mut doc = Document::new(&win.root_ref(), None, NonHTMLDocument, None).root();
         // Step 2-3.
-        let maybe_elem = if qname.is_empty() {
+        let mut maybe_elem = if qname.is_empty() {
             None
         } else {
-            match doc.get().CreateElementNS(&doc, namespace, qname) {
+            match doc.CreateElementNS(namespace, qname) {
                 Err(error) => return Err(error),
                 Ok(elem) => Some(elem)
             }
         };
 
-        // Step 4.
-        match maybe_doctype {
-            None => (),
-            Some(ref doctype) => assert!(doc_node.AppendChild(&mut NodeCast::from(doctype)).is_ok())
-        }
+        {
+            let doc_node: &mut JSRef<Node> = NodeCast::from_mut_ref(&mut *doc);
 
-        // Step 5.
-        match maybe_elem {
-            None => (),
-            Some(ref elem) => assert!(doc_node.AppendChild(&mut NodeCast::from(elem)).is_ok())
+            // Step 4.
+            match maybe_doctype {
+                None => (),
+                Some(ref mut doctype) => {
+                    assert!(doc_node.AppendChild(NodeCast::from_mut_ref(doctype)).is_ok())
+                }
+            }
+
+            // Step 5.
+            match maybe_elem.root() {
+                None => (),
+                Some(mut elem) => {
+                    assert!(doc_node.AppendChild(NodeCast::from_mut_ref(&mut *elem)).is_ok())
+                }
+            }
         }
 
         // Step 6.
         // FIXME: https://github.com/mozilla/servo/issues/1522
 
         // Step 7.
-        Ok(doc)
+        Ok(Temporary::from_rooted(&*doc))
     }
 
     // http://dom.spec.whatwg.org/#dom-domimplementation-createhtmldocument
-    pub fn CreateHTMLDocument(&self, title: Option<DOMString>) -> JS<Document> {
+    fn CreateHTMLDocument(&self, title: Option<DOMString>) -> Temporary<Document> {
+        let owner = self.owner.root();
+
         // Step 1-2.
-        let doc = Document::new(&self.owner, None, HTMLDocument, None);
-        let mut doc_node: JS<Node> = NodeCast::from(&doc);
+        let mut doc = Document::new(&owner.root_ref(), None, HTMLDocument, None).root();
+        let mut doc_alias = doc.clone();
+        let doc_node: &mut JSRef<Node> = NodeCast::from_mut_ref(&mut doc_alias);
 
         {
             // Step 3.
-            let doc_type = DocumentType::new(~"html", None, None, &doc);
-            assert!(doc_node.AppendChild(&mut NodeCast::from(&doc_type)).is_ok());
+            let mut doc_type = DocumentType::new(~"html", None, None, &*doc).root();
+            assert!(doc_node.AppendChild(NodeCast::from_mut_ref(&mut *doc_type)).is_ok());
         }
 
         {
             // Step 4.
-            let mut doc_html = NodeCast::from(&HTMLHtmlElement::new(~"html", &doc));
-            assert!(doc_node.AppendChild(&mut doc_html).is_ok());
+            let mut doc_html = NodeCast::from_unrooted(HTMLHtmlElement::new(~"html", &*doc)).root();
+            assert!(doc_node.AppendChild(&mut *doc_html).is_ok());
 
             {
                 // Step 5.
-                let mut doc_head = NodeCast::from(&HTMLHeadElement::new(~"head", &doc));
-                assert!(doc_html.AppendChild(&mut doc_head).is_ok());
+                let mut doc_head = NodeCast::from_unrooted(HTMLHeadElement::new(~"head", &*doc)).root();
+                assert!(doc_html.AppendChild(&mut *doc_head).is_ok());
 
                 // Step 6.
                 match title {
                     None => (),
                     Some(title_str) => {
                         // Step 6.1.
-                        let mut doc_title = NodeCast::from(&HTMLTitleElement::new(~"title", &doc));
-                        assert!(doc_head.AppendChild(&mut doc_title).is_ok());
+                        let mut doc_title = NodeCast::from_unrooted(HTMLTitleElement::new(~"title", &*doc)).root();
+                        assert!(doc_head.AppendChild(&mut *doc_title).is_ok());
 
                         // Step 6.2.
-                        let title_text = Text::new(title_str, &doc);
-                        assert!(doc_title.AppendChild(&mut NodeCast::from(&title_text)).is_ok());
+                        let mut title_text = Text::new(title_str, &*doc).root();
+                        assert!(doc_title.AppendChild(NodeCast::from_mut_ref(&mut *title_text)).is_ok());
                     }
                 }
             }
 
             // Step 7.
-            let doc_body = HTMLBodyElement::new(~"body", &doc);
-            assert!(doc_html.AppendChild(&mut NodeCast::from(&doc_body)).is_ok());
+            let mut doc_body = HTMLBodyElement::new(~"body", &*doc).root();
+            assert!(doc_html.AppendChild(NodeCast::from_mut_ref(&mut *doc_body)).is_ok());
         }
 
         // Step 8.
         // FIXME: https://github.com/mozilla/servo/issues/1522
 
         // Step 9.
-        doc
+        Temporary::from_rooted(&*doc)
     }
 }

src/components/script/dom/domparser.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::DOMParserBinding;
 use dom::bindings::codegen::BindingDeclarations::DOMParserBinding::SupportedTypeValues::{Text_html, Text_xml};
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Temporary};
 use dom::bindings::utils::{Reflector, Reflectable, reflect_dom_object};
 use dom::bindings::error::{Fallible, FailureUnknown};
 use dom::document::{Document, HTMLDocument, NonHTMLDocument};
@@ -18,32 +18,40 @@ pub struct DOMParser {
 }
 
 impl DOMParser {
-    pub fn new_inherited(owner: JS<Window>) -> DOMParser {
+    pub fn new_inherited(owner: &JSRef<Window>) -> DOMParser {
         DOMParser {
-            owner: owner,
+            owner: owner.unrooted(),
             reflector_: Reflector::new()
         }
     }
 
-    pub fn new(owner: &JS<Window>) -> JS<DOMParser> {
-        reflect_dom_object(~DOMParser::new_inherited(owner.clone()), owner,
+    pub fn new(owner: &JSRef<Window>) -> Temporary<DOMParser> {
+        reflect_dom_object(~DOMParser::new_inherited(owner), owner,
                            DOMParserBinding::Wrap)
     }
 
-    pub fn Constructor(owner: &JS<Window>) -> Fallible<JS<DOMParser>> {
+    pub fn Constructor(owner: &JSRef<Window>) -> Fallible<Temporary<DOMParser>> {
         Ok(DOMParser::new(owner))
     }
+}
 
-    pub fn ParseFromString(&self,
-                           _s: DOMString,
-                           ty: DOMParserBinding::SupportedType)
-                           -> Fallible<JS<Document>> {
+pub trait DOMParserMethods {
+    fn ParseFromString(&self, _s: DOMString, ty: DOMParserBinding::SupportedType)
+        -> Fallible<Temporary<Document>>;
+}
+
+impl<'a> DOMParserMethods for JSRef<'a, DOMParser> {
+    fn ParseFromString(&self,
+                       _s: DOMString,
+                       ty: DOMParserBinding::SupportedType)
+                       -> Fallible<Temporary<Document>> {
+        let owner = self.owner.root();
         match ty {
             Text_html => {
-                Ok(Document::new(&self.owner, None, HTMLDocument, Some(~"text/html")))
+                Ok(Document::new(&owner.root_ref(), None, HTMLDocument, Some(~"text/html")))
             }
             Text_xml => {
-                Ok(Document::new(&self.owner, None, NonHTMLDocument, Some(~"text/xml")))
+                Ok(Document::new(&owner.root_ref(), None, NonHTMLDocument, Some(~"text/xml")))
             }
             _ => {
                 Err(FailureUnknown)

src/components/script/dom/element.rs

@@ -4,21 +4,23 @@
 
 //! Element nodes.
 
-use dom::attr::{Attr, AttrSettingType, ReplacedAttr, FirstSetAttr};
+use dom::attr::{Attr, ReplacedAttr, FirstSetAttr, AttrMethods};
 use dom::attrlist::AttrList;
 use dom::bindings::codegen::BindingDeclarations::ElementBinding;
 use dom::bindings::codegen::InheritTypes::{ElementDerived, NodeCast};
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Temporary, TemporaryPushable};
+use dom::bindings::js::{OptionalSettable, OptionalRootable, Root};
 use dom::bindings::utils::{Reflectable, Reflector};
 use dom::bindings::error::{ErrorResult, Fallible, NamespaceError, InvalidCharacter};
 use dom::bindings::utils::{QName, Name, InvalidXMLName, xml_name_type};
 use dom::clientrect::ClientRect;
 use dom::clientrectlist::ClientRectList;
-use dom::document::Document;
+use dom::document::{Document, DocumentHelpers};
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
 use dom::htmlcollection::HTMLCollection;
 use dom::htmlserializer::serialize;
 use dom::node::{ElementNodeTypeId, Node, NodeHelpers, NodeIterator, document_from_node};
+use dom::node::{window_from_node, LayoutNodeHelpers};
 use dom::virtualmethods::{VirtualMethods, vtable_for};
 use layout_interface::ContentChangedDocumentDamage;
 use layout_interface::MatchSelectorsDocumentDamage;
@@ -139,7 +141,7 @@ pub enum ElementTypeId {
 //
 
 impl Element {
-    pub fn new_inherited(type_id: ElementTypeId, local_name: DOMString, namespace: Namespace, prefix: Option<DOMString>, document: JS<Document>) -> Element {
+    pub fn new_inherited(type_id: ElementTypeId, local_name: DOMString, namespace: Namespace, prefix: Option<DOMString>, document: &JSRef<Document>) -> Element {
         Element {
             node: Node::new_inherited(ElementNodeTypeId(type_id), document),
             local_name: local_name,
@@ -151,53 +153,65 @@ impl Element {
         }
     }
 
-    pub fn new(local_name: DOMString, namespace: Namespace, prefix: Option<DOMString>, document: &JS<Document>) -> JS<Element> {
-        let element = Element::new_inherited(ElementTypeId, local_name, namespace, prefix, document.clone());
+    pub fn new(local_name: DOMString, namespace: Namespace, prefix: Option<DOMString>, document: &JSRef<Document>) -> Temporary<Element> {
+        let element = Element::new_inherited(ElementTypeId, local_name, namespace, prefix, document);
         Node::reflect_node(~element, document, ElementBinding::Wrap)
     }
-
-    pub fn html_element_in_html_document(&self) -> bool {
-        self.namespace == namespace::HTML &&
-        self.node.owner_doc().get().is_html_document
-    }
 }
 
-impl Element {
-    pub unsafe fn html_element_in_html_document_for_layout(&self) -> bool {
-        if self.namespace != namespace::HTML {
-            return false
-        }
-        let owner_doc: *JS<Document> = self.node.owner_doc();
-        let owner_doc: **Document = owner_doc as **Document;
-        (**owner_doc).is_html_document
-    }
+pub trait RawLayoutElementHelpers {
+    unsafe fn get_attr_val_for_layout(&self, namespace: &Namespace, name: &str) -> Option<&'static str>;
+}
 
+impl RawLayoutElementHelpers for Element {
     #[inline]
-    pub unsafe fn get_attr_val_for_layout(&self, namespace: &Namespace, name: &str)
-                                          -> Option<&'static str> {
+    unsafe fn get_attr_val_for_layout(&self, namespace: &Namespace, name: &str)
+                                      -> Option<&'static str> {
         self.attrs.iter().find(|attr: & &JS<Attr>| {
-            // unsafely avoid a borrow because this is accessed by many tasks
-            // during parallel layout
-            let attr: ***Attr = cast::transmute(attr);
-            name == (***attr).local_name && (***attr).namespace == *namespace
+            let attr = attr.unsafe_get();
+            name == (*attr).local_name && (*attr).namespace == *namespace
        }).map(|attr| {
-            let attr: **Attr = cast::transmute(attr);
-            cast::transmute((**attr).value.as_slice())
+            let attr = attr.unsafe_get();
+            cast::transmute((*attr).value.as_slice())
         })
     }
 }
 
+pub trait LayoutElementHelpers {
+    unsafe fn html_element_in_html_document_for_layout(&self) -> bool;
+}
+
+impl LayoutElementHelpers for JS<Element> {
+    unsafe fn html_element_in_html_document_for_layout(&self) -> bool {
+        if (*self.unsafe_get()).namespace != namespace::HTML {
+            return false
+        }
+        let node: JS<Node> = self.transmute_copy();
+        let owner_doc = node.owner_doc_for_layout().unsafe_get();
+        (*owner_doc).is_html_document
+    }
+}
+
+pub trait ElementHelpers {
+    fn html_element_in_html_document(&self) -> bool;
+}
+
+impl<'a> ElementHelpers for JSRef<'a, Element> {
+    fn html_element_in_html_document(&self) -> bool {
+        let is_html = self.namespace == namespace::HTML;
+        let node: &JSRef<Node> = NodeCast::from_ref(self);
+        is_html && node.owner_doc().root().is_html_document
+    }
+}
+
 pub trait AttributeHandlers {
-    fn get_attribute(&self, namespace: Namespace, name: &str) -> Option<JS<Attr>>;
+    fn get_attribute(&self, namespace: Namespace, name: &str) -> Option<Temporary<Attr>>;
     fn set_attr(&mut self, name: DOMString, value: DOMString) -> ErrorResult;
     fn set_attribute(&mut self, namespace: Namespace, name: DOMString,
                      value: DOMString) -> ErrorResult;
     fn do_set_attribute(&mut self, local_name: DOMString, value: DOMString,
                         name: DOMString, namespace: Namespace,
-                        prefix: Option<DOMString>, cb: |&JS<Attr>| -> bool);
-    fn SetAttribute(&mut self, name: DOMString, value: DOMString) -> ErrorResult;
-    fn SetAttributeNS(&mut self, namespace_url: Option<DOMString>,
-                      name: DOMString, value: DOMString) -> ErrorResult;
+                        prefix: Option<DOMString>, cb: |&JSRef<Attr>| -> bool);
 
     fn remove_attribute(&mut self, namespace: Namespace, name: DOMString) -> ErrorResult;
     fn notify_attribute_changed(&self, local_name: DOMString);
@@ -211,18 +225,16 @@ pub trait AttributeHandlers {
     fn set_uint_attribute(&mut self, name: &str, value: u32);
 }
 
-impl AttributeHandlers for JS<Element> {
-    fn get_attribute(&self, namespace: Namespace, name: &str) -> Option<JS<Attr>> {
-        if self.get().html_element_in_html_document() {
-            self.get().attrs.iter().find(|attr| {
-                let attr = attr.get();
+impl<'a> AttributeHandlers for JSRef<'a, Element> {
+    fn get_attribute(&self, namespace: Namespace, name: &str) -> Option<Temporary<Attr>> {
+        if self.html_element_in_html_document() {
+            self.deref().attrs.iter().map(|attr| attr.root()).find(|attr| {
                 name.to_ascii_lower() == attr.local_name && attr.namespace == namespace
-            }).map(|x| x.clone())
+            }).map(|x| Temporary::from_rooted(&*x))
         } else {
-            self.get().attrs.iter().find(|attr| {
-                let attr = attr.get();
+            self.deref().attrs.iter().map(|attr| attr.root()).find(|attr| {
                 name == attr.local_name && attr.namespace == namespace
-            }).map(|x| x.clone())
+            }).map(|x| Temporary::from_rooted(&*x))
         }
     }
 
@@ -244,14 +256,15 @@ impl AttributeHandlers for JS<Element> {
             None => {}
         }
 
-        let node: JS<Node> = NodeCast::from(self);
-        node.get().wait_until_safe_to_modify_dom();
+        let self_alias = self.clone();
+        let node: &JSRef<Node> = NodeCast::from_ref(&self_alias);
+        node.wait_until_safe_to_modify_dom();
 
-        let position: |&JS<Attr>| -> bool =
-            if self.get().html_element_in_html_document() {
-                |attr| attr.get().local_name.eq_ignore_ascii_case(local_name)
+        let position: |&JSRef<Attr>| -> bool =
+            if self.html_element_in_html_document() {
+                |attr| attr.deref().local_name.eq_ignore_ascii_case(local_name)
             } else {
-                |attr| attr.get().local_name == local_name
+                |attr| attr.deref().local_name == local_name
             };
         self.do_set_attribute(name.clone(), value, name.clone(), namespace::Null, None, position);
         Ok(())
@@ -259,31 +272,234 @@ impl AttributeHandlers for JS<Element> {
 
     fn do_set_attribute(&mut self, local_name: DOMString, value: DOMString,
                         name: DOMString, namespace: Namespace,
-                        prefix: Option<DOMString>, cb: |&JS<Attr>| -> bool) {
-        let node: JS<Node> = NodeCast::from(self);
-        let idx = self.get().attrs.iter().position(cb);
-        let (mut attr, set_type): (JS<Attr>, AttrSettingType) = match idx {
-            Some(idx) => {
-                let attr = self.get_mut().attrs.get(idx).clone();
-                (attr, ReplacedAttr)
-            }
-
+                        prefix: Option<DOMString>, cb: |&JSRef<Attr>| -> bool) {
+        let idx = self.deref().attrs.iter()
+                                    .map(|attr| attr.root())
+                                    .position(|attr| cb(&*attr));
+        let (idx, set_type) = match idx {
+            Some(idx) => (idx, ReplacedAttr),
             None => {
-                let doc = node.get().owner_doc().get();
-                let attr = Attr::new(&doc.window, local_name.clone(), value.clone(),
-                                         name, namespace.clone(), prefix, self.clone());
-                self.get_mut().attrs.push(attr.clone());
-                (attr, FirstSetAttr)
+                let window = window_from_node(self).root();
+                let attr = Attr::new(&*window, local_name.clone(), value.clone(),
+                                     name, namespace.clone(), prefix, self);
+                self.deref_mut().attrs.push_unrooted(&attr);
+                (self.deref().attrs.len() - 1, FirstSetAttr)
             }
         };
 
-        attr.get_mut().set_value(set_type, value);
+        self.deref_mut().attrs.get(idx).root().set_value(set_type, value);
+    }
+
+    fn remove_attribute(&mut self, namespace: Namespace, name: DOMString) -> ErrorResult {
+        let (_, local_name) = get_attribute_parts(name.clone());
+
+        let idx = self.deref().attrs.iter().map(|attr| attr.root()).position(|attr| {
+            attr.local_name == local_name
+        });
+
+        match idx {
+            None => (),
+            Some(idx) => {
+                {
+                    let node: &mut JSRef<Node> = NodeCast::from_mut_ref(self);
+                    node.wait_until_safe_to_modify_dom();
+                }
+
+                if namespace == namespace::Null {
+                    let removed_raw_value = self.deref().attrs.get(idx).root().Value();
+                    vtable_for(NodeCast::from_mut_ref(self))
+                        .before_remove_attr(local_name.clone(), removed_raw_value);
+                }
+
+                self.deref_mut().attrs.remove(idx);
+            }
+        };
+
+        Ok(())
+    }
+
+    fn notify_attribute_changed(&self, local_name: DOMString) {
+        let node: &JSRef<Node> = NodeCast::from_ref(self);
+        if node.is_in_doc() {
+            let damage = match local_name.as_slice() {
+                "style" | "id" | "class" => MatchSelectorsDocumentDamage,
+                _ => ContentChangedDocumentDamage
+            };
+            let document = node.owner_doc().root();
+            document.deref().damage_and_reflow(damage);
+        }
+    }
+
+    fn has_class(&self, name: &str) -> bool {
+        let class_names = self.get_string_attribute("class");
+        let mut classes = split_html_space_chars(class_names);
+        classes.any(|class| name == class)
+    }
+
+    fn get_url_attribute(&self, name: &str) -> DOMString {
+        // XXX Resolve URL.
+        self.get_string_attribute(name)
+    }
+    fn set_url_attribute(&mut self, name: &str, value: DOMString) {
+        self.set_string_attribute(name, value);
+    }
+
+    fn get_string_attribute(&self, name: &str) -> DOMString {
+        match self.get_attribute(Null, name) {
+            Some(x) => {
+                let x = x.root();
+                x.deref().Value()
+            }
+            None => ~""
+        }
+    }
+    fn set_string_attribute(&mut self, name: &str, value: DOMString) {
+        assert!(name == name.to_ascii_lower());
+        assert!(self.set_attribute(Null, name.to_owned(), value).is_ok());
+    }
+
+    fn set_uint_attribute(&mut self, name: &str, value: u32) {
+        assert!(name == name.to_ascii_lower());
+        assert!(self.set_attribute(Null, name.to_owned(), value.to_str()).is_ok());
+    }
+}
+
+impl Element {
+    pub fn is_void(&self) -> bool {
+        if self.namespace != namespace::HTML {
+            return false
+        }
+        match self.local_name.as_slice() {
+            /* List of void elements from
+            http://www.whatwg.org/specs/web-apps/current-work/multipage/the-end.html#html-fragment-serialization-algorithm */
+            "area" | "base" | "basefont" | "bgsound" | "br" | "col" | "embed" |
+            "frame" | "hr" | "img" | "input" | "keygen" | "link" | "menuitem" |
+            "meta" | "param" | "source" | "track" | "wbr" => true,
+            _ => false
+        }
+    }
+}
+
+pub trait ElementMethods {
+    fn NamespaceURI(&self) -> DOMString;
+    fn LocalName(&self) -> DOMString;
+    fn GetPrefix(&self) -> Option<DOMString>;
+    fn TagName(&self) -> DOMString;
+    fn Id(&self) -> DOMString;
+    fn SetId(&mut self, id: DOMString);
+    fn ClassName(&self) -> DOMString;
+    fn SetClassName(&mut self, class: DOMString);
+    fn Attributes(&mut self) -> Temporary<AttrList>;
+    fn GetAttribute(&self, name: DOMString) -> Option<DOMString>;
+    fn GetAttributeNS(&self, namespace: Option<DOMString>, local_name: DOMString) -> Option<DOMString>;
+    fn SetAttribute(&mut self, name: DOMString, value: DOMString) -> ErrorResult;
+    fn SetAttributeNS(&mut self, namespace_url: Option<DOMString>, name: DOMString, value: DOMString) -> ErrorResult;
+    fn RemoveAttribute(&mut self, name: DOMString) -> ErrorResult;
+    fn RemoveAttributeNS(&mut self, namespace: Option<DOMString>, localname: DOMString) -> ErrorResult;
+    fn HasAttribute(&self, name: DOMString) -> bool;
+    fn HasAttributeNS(&self, namespace: Option<DOMString>, local_name: DOMString) -> bool;
+    fn GetElementsByTagName(&self, localname: DOMString) -> Temporary<HTMLCollection>;
+    fn GetElementsByTagNameNS(&self, maybe_ns: Option<DOMString>, localname: DOMString) -> Temporary<HTMLCollection>;
+    fn GetElementsByClassName(&self, classes: DOMString) -> Temporary<HTMLCollection>;
+    fn GetClientRects(&self) -> Temporary<ClientRectList>;
+    fn GetBoundingClientRect(&self) -> Temporary<ClientRect>;
+    fn GetInnerHTML(&self) -> Fallible<DOMString>;
+    fn GetOuterHTML(&self) -> Fallible<DOMString>;
+    fn Children(&self) -> Temporary<HTMLCollection>;
+}
+
+impl<'a> ElementMethods for JSRef<'a, Element> {
+    // http://dom.spec.whatwg.org/#dom-element-namespaceuri
+    fn NamespaceURI(&self) -> DOMString {
+        self.namespace.to_str().to_owned()
+    }
+
+    fn LocalName(&self) -> DOMString {
+        self.local_name.clone()
+    }
+
+    // http://dom.spec.whatwg.org/#dom-element-prefix
+    fn GetPrefix(&self) -> Option<DOMString> {
+        self.prefix.clone()
+    }
+
+    // http://dom.spec.whatwg.org/#dom-element-tagname
+    fn TagName(&self) -> DOMString {
+        match self.prefix {
+            None => {
+                self.local_name.to_ascii_upper()
+            }
+            Some(ref prefix_str) => {
+                (*prefix_str + ":" + self.local_name).to_ascii_upper()
+            }
+        }
+    }
+
+    // http://dom.spec.whatwg.org/#dom-element-id
+    fn Id(&self) -> DOMString {
+        self.get_string_attribute("id")
+    }
+
+    // http://dom.spec.whatwg.org/#dom-element-id
+    fn SetId(&mut self, id: DOMString) {
+        self.set_string_attribute("id", id);
+    }
+
+    // http://dom.spec.whatwg.org/#dom-element-classname
+    fn ClassName(&self) -> DOMString {
+        self.get_string_attribute("class")
+    }
+
+    // http://dom.spec.whatwg.org/#dom-element-classname
+    fn SetClassName(&mut self, class: DOMString) {
+        self.set_string_attribute("class", class);
+    }
+
+    // http://dom.spec.whatwg.org/#dom-element-attributes
+    fn Attributes(&mut self) -> Temporary<AttrList> {
+        match self.attr_list {
+            None => (),
+            Some(ref list) => return Temporary::new(list.clone()),
+        }
+
+        let doc = {
+            let node: &JSRef<Node> = NodeCast::from_ref(self);
+            node.owner_doc().root()
+        };
+        let window = doc.deref().window.root();
+        let list = AttrList::new(&*window, self);
+        self.attr_list.assign(Some(list));
+        Temporary::new(self.attr_list.get_ref().clone())
+    }
+
+    // http://dom.spec.whatwg.org/#dom-element-getattribute
+    fn GetAttribute(&self, name: DOMString) -> Option<DOMString> {
+        let name = if self.html_element_in_html_document() {
+            name.to_ascii_lower()
+        } else {
+            name
+        };
+        self.get_attribute(Null, name).root()
+                     .map(|s| s.deref().Value())
+    }
+
+    // http://dom.spec.whatwg.org/#dom-element-getattributens
+    fn GetAttributeNS(&self,
+                      namespace: Option<DOMString>,
+                      local_name: DOMString) -> Option<DOMString> {
+        let namespace = Namespace::from_str(null_str_as_empty_ref(&namespace));
+        self.get_attribute(namespace, local_name).root()
+                     .map(|attr| attr.deref().Value())
     }
 
     // http://dom.spec.whatwg.org/#dom-element-setattribute
-    fn SetAttribute(&mut self, name: DOMString, value: DOMString) -> ErrorResult {
-        let node: JS<Node> = NodeCast::from(self);
-        node.get().wait_until_safe_to_modify_dom();
+    fn SetAttribute(&mut self,
+                    name: DOMString,
+                    value: DOMString) -> ErrorResult {
+        {
+            let node: &JSRef<Node> = NodeCast::from_ref(self);
+            node.wait_until_safe_to_modify_dom();
+        }
 
         // Step 1.
         match xml_name_type(name) {
@@ -292,7 +508,7 @@ impl AttributeHandlers for JS<Element> {
         }
 
         // Step 2.
-        let name = if self.get().html_element_in_html_document() {
+        let name = if self.html_element_in_html_document() {
             name.to_ascii_lower()
         } else {
             name
@@ -300,15 +516,20 @@ impl AttributeHandlers for JS<Element> {
 
         // Step 3-5.
         self.do_set_attribute(name.clone(), value, name.clone(), namespace::Null, None, |attr| {
-            attr.get().name == name
+            attr.deref().name == name
         });
         Ok(())
     }
 
-    fn SetAttributeNS(&mut self, namespace_url: Option<DOMString>,
-                      name: DOMString, value: DOMString) -> ErrorResult {
-        let node: JS<Node> = NodeCast::from(self);
-        node.get().wait_until_safe_to_modify_dom();
+    // http://dom.spec.whatwg.org/#dom-element-setattributens
+    fn SetAttributeNS(&mut self,
+                      namespace_url: Option<DOMString>,
+                      name: DOMString,
+                      value: DOMString) -> ErrorResult {
+        {
+            let node: &JSRef<Node> = NodeCast::from_ref(self);
+            node.wait_until_safe_to_modify_dom();
+        }
 
         // Step 1.
         let namespace = Namespace::from_str(null_str_as_empty_ref(&namespace_url));
@@ -356,294 +577,106 @@ impl AttributeHandlers for JS<Element> {
 
         // Step 9.
         self.do_set_attribute(local_name.clone(), value, name, namespace.clone(), prefix, |attr| {
-            attr.get().local_name == local_name &&
-            attr.get().namespace == namespace
+            attr.deref().local_name == local_name &&
+            attr.deref().namespace == namespace
         });
         Ok(())
     }
 
-    fn remove_attribute(&mut self, namespace: Namespace, name: DOMString) -> ErrorResult {
-        let (_, local_name) = get_attribute_parts(name.clone());
-
-        let node: JS<Node> = NodeCast::from(self);
-        node.get().wait_until_safe_to_modify_dom();
-
-        let idx = self.get().attrs.iter().position(|attr| {
-            attr.get().local_name == local_name
-        });
-
-        match idx {
-            None => (),
-            Some(idx) => {
-                if namespace == namespace::Null {
-                    let removed_raw_value = self.get().attrs.get(idx).get().Value();
-                    vtable_for(&node).before_remove_attr(local_name.clone(), removed_raw_value);
-                }
-
-                self.get_mut().attrs.remove(idx);
-            }
-        };
-
-        Ok(())
-    }
-
-    fn notify_attribute_changed(&self, local_name: DOMString) {
-        let node: JS<Node> = NodeCast::from(self);
-        if node.is_in_doc() {
-            let damage = match local_name.as_slice() {
-                "style" | "id" | "class" => MatchSelectorsDocumentDamage,
-                _ => ContentChangedDocumentDamage
-            };
-            let document = node.get().owner_doc();
-            document.get().damage_and_reflow(damage);
-        }
-    }
-
-    fn has_class(&self, name: &str) -> bool {
-        let class_names = self.get_string_attribute("class");
-        let mut classes = split_html_space_chars(class_names);
-        classes.any(|class| name == class)
-    }
-
-    fn get_url_attribute(&self, name: &str) -> DOMString {
-        // XXX Resolve URL.
-        self.get_string_attribute(name)
-    }
-    fn set_url_attribute(&mut self, name: &str, value: DOMString) {
-        self.set_string_attribute(name, value);
-    }
-
-    fn get_string_attribute(&self, name: &str) -> DOMString {
-        match self.get_attribute(Null, name) {
-            Some(x) => x.get().Value(),
-            None => ~""
-        }
-    }
-    fn set_string_attribute(&mut self, name: &str, value: DOMString) {
-        assert!(name == name.to_ascii_lower());
-        assert!(self.set_attribute(Null, name.to_owned(), value).is_ok());
-    }
-
-    fn set_uint_attribute(&mut self, name: &str, value: u32) {
-        assert!(name == name.to_ascii_lower());
-        assert!(self.set_attribute(Null, name.to_owned(), value.to_str()).is_ok());
-    }
-}
-
-impl Element {
-    pub fn is_void(&self) -> bool {
-        if self.namespace != namespace::HTML {
-            return false
-        }
-        match self.local_name.as_slice() {
-            /* List of void elements from
-            http://www.whatwg.org/specs/web-apps/current-work/multipage/the-end.html#html-fragment-serialization-algorithm */
-            "area" | "base" | "basefont" | "bgsound" | "br" | "col" | "embed" |
-            "frame" | "hr" | "img" | "input" | "keygen" | "link" | "menuitem" |
-            "meta" | "param" | "source" | "track" | "wbr" => true,
-            _ => false
-        }
-    }
-}
-
-impl Element {
-    // http://dom.spec.whatwg.org/#dom-element-namespaceuri
-    pub fn NamespaceURI(&self) -> DOMString {
-        self.namespace.to_str().to_owned()
-    }
-
-    pub fn LocalName(&self) -> DOMString {
-        self.local_name.clone()
-    }
-
-    // http://dom.spec.whatwg.org/#dom-element-prefix
-    pub fn GetPrefix(&self) -> Option<DOMString> {
-        self.prefix.clone()
-    }
-
-    // http://dom.spec.whatwg.org/#dom-element-tagname
-    pub fn TagName(&self) -> DOMString {
-        match self.prefix {
-            None => {
-                self.local_name.to_ascii_upper()
-            }
-            Some(ref prefix_str) => {
-                (*prefix_str + ":" + self.local_name).to_ascii_upper()
-            }
-        }
-    }
-
-    // http://dom.spec.whatwg.org/#dom-element-id
-    pub fn Id(&self, abstract_self: &JS<Element>) -> DOMString {
-        abstract_self.get_string_attribute("id")
-    }
-
-    // http://dom.spec.whatwg.org/#dom-element-id
-    pub fn SetId(&mut self, abstract_self: &mut JS<Element>, id: DOMString) {
-        abstract_self.set_string_attribute("id", id);
-    }
-
-    // http://dom.spec.whatwg.org/#dom-element-classname
-    pub fn ClassName(&self, abstract_self: &JS<Element>) -> DOMString {
-        abstract_self.get_string_attribute("class")
-    }
-
-    // http://dom.spec.whatwg.org/#dom-element-classname
-    pub fn SetClassName(&self, abstract_self: &mut JS<Element>, class: DOMString) {
-        abstract_self.set_string_attribute("class", class);
-    }
-
-    // http://dom.spec.whatwg.org/#dom-element-attributes
-    pub fn Attributes(&mut self, abstract_self: &JS<Element>) -> JS<AttrList> {
-        match self.attr_list {
-            None => {
-                let doc = self.node.owner_doc();
-                let doc = doc.get();
-                let list = AttrList::new(&doc.window, abstract_self);
-                self.attr_list = Some(list.clone());
-                list
-            }
-            Some(ref list) => list.clone()
-        }
-    }
-
-    // http://dom.spec.whatwg.org/#dom-element-getattribute
-    pub fn GetAttribute(&self, abstract_self: &JS<Element>, name: DOMString) -> Option<DOMString> {
-        let name = if abstract_self.get().html_element_in_html_document() {
-            name.to_ascii_lower()
-        } else {
-            name
-        };
-        abstract_self.get_attribute(Null, name).map(|s| s.get().Value())
-    }
-
-    // http://dom.spec.whatwg.org/#dom-element-getattributens
-    pub fn GetAttributeNS(&self, abstract_self: &JS<Element>,
-                          namespace: Option<DOMString>,
-                          local_name: DOMString) -> Option<DOMString> {
-        let namespace = Namespace::from_str(null_str_as_empty_ref(&namespace));
-        abstract_self.get_attribute(namespace, local_name)
-                     .map(|attr| attr.get().value.clone())
-    }
-
-    // http://dom.spec.whatwg.org/#dom-element-setattribute
-    pub fn SetAttribute(&self, abstract_self: &mut JS<Element>,
-                        name: DOMString,
-                        value: DOMString) -> ErrorResult {
-        abstract_self.SetAttribute(name, value)
-    }
-
-    // http://dom.spec.whatwg.org/#dom-element-setattributens
-    pub fn SetAttributeNS(&self,
-                          abstract_self: &mut JS<Element>,
-                          namespace_url: Option<DOMString>,
-                          name: DOMString,
-                          value: DOMString) -> ErrorResult {
-        abstract_self.SetAttributeNS(namespace_url, name, value)
-    }
-
     // http://dom.spec.whatwg.org/#dom-element-removeattribute
-    pub fn RemoveAttribute(&mut self,
-                           abstract_self: &mut JS<Element>,
-                           name: DOMString) -> ErrorResult {
+    fn RemoveAttribute(&mut self,
+                       name: DOMString) -> ErrorResult {
         let name = if self.html_element_in_html_document() {
             name.to_ascii_lower()
         } else {
             name
         };
-        abstract_self.remove_attribute(namespace::Null, name)
+        self.remove_attribute(namespace::Null, name)
     }
 
     // http://dom.spec.whatwg.org/#dom-element-removeattributens
-    pub fn RemoveAttributeNS(&mut self,
-                             abstract_self: &mut JS<Element>,
-                             namespace: Option<DOMString>,
-                             localname: DOMString) -> ErrorResult {
+    fn RemoveAttributeNS(&mut self,
+                         namespace: Option<DOMString>,
+                         localname: DOMString) -> ErrorResult {
         let namespace = Namespace::from_str(null_str_as_empty_ref(&namespace));
-        abstract_self.remove_attribute(namespace, localname)
+        self.remove_attribute(namespace, localname)
     }
 
     // http://dom.spec.whatwg.org/#dom-element-hasattribute
-    pub fn HasAttribute(&self, abstract_self: &JS<Element>,
-                        name: DOMString) -> bool {
-        self.GetAttribute(abstract_self, name).is_some()
+    fn HasAttribute(&self,
+                    name: DOMString) -> bool {
+        self.GetAttribute(name).is_some()
     }
 
     // http://dom.spec.whatwg.org/#dom-element-hasattributens
-    pub fn HasAttributeNS(&self, abstract_self: &JS<Element>,
-                          namespace: Option<DOMString>,
-                          local_name: DOMString) -> bool {
-        self.GetAttributeNS(abstract_self, namespace, local_name).is_some()
+    fn HasAttributeNS(&self,
+                      namespace: Option<DOMString>,
+                      local_name: DOMString) -> bool {
+        self.GetAttributeNS(namespace, local_name).is_some()
     }
 
-    pub fn GetElementsByTagName(&self, abstract_self: &JS<Element>, localname: DOMString) -> JS<HTMLCollection> {
-        let doc = self.node.owner_doc();
-        let doc = doc.get();
-        HTMLCollection::by_tag_name(&doc.window, &NodeCast::from(abstract_self), localname)
+    fn GetElementsByTagName(&self, localname: DOMString) -> Temporary<HTMLCollection> {
+        let window = window_from_node(self).root();
+        HTMLCollection::by_tag_name(&*window, NodeCast::from_ref(self), localname)
     }
 
-    pub fn GetElementsByTagNameNS(&self, abstract_self: &JS<Element>, maybe_ns: Option<DOMString>,
-                                  localname: DOMString) -> JS<HTMLCollection> {
-        let doc = self.node.owner_doc();
-        let doc = doc.get();
+    fn GetElementsByTagNameNS(&self, maybe_ns: Option<DOMString>,
+                              localname: DOMString) -> Temporary<HTMLCollection> {
         let namespace = match maybe_ns {
             Some(namespace) => Namespace::from_str(namespace),
             None => Null
         };
-        HTMLCollection::by_tag_name_ns(&doc.window, &NodeCast::from(abstract_self), localname, namespace)
+        let window = window_from_node(self).root();
+        HTMLCollection::by_tag_name_ns(&*window, NodeCast::from_ref(self), localname, namespace)
     }
 
-    pub fn GetElementsByClassName(&self, abstract_self: &JS<Element>, classes: DOMString) -> JS<HTMLCollection> {
-        let doc = self.node.owner_doc();
-        let doc = doc.get();
-        HTMLCollection::by_class_name(&doc.window, &NodeCast::from(abstract_self), classes)
+    fn GetElementsByClassName(&self, classes: DOMString) -> Temporary<HTMLCollection> {
+        let window = window_from_node(self).root();
+        HTMLCollection::by_class_name(&*window, NodeCast::from_ref(self), classes)
     }
 
     // http://dev.w3.org/csswg/cssom-view/#dom-element-getclientrects
-    pub fn GetClientRects(&self, abstract_self: &JS<Element>) -> JS<ClientRectList> {
-        let doc = self.node.owner_doc();
-        let win = &doc.get().window;
-        let node: JS<Node> = NodeCast::from(abstract_self);
+    fn GetClientRects(&self) -> Temporary<ClientRectList> {
+        let win = window_from_node(self).root();
+        let node: &JSRef<Node> = NodeCast::from_ref(self);
         let rects = node.get_content_boxes();
-        let rects = rects.iter().map(|r| {
+        let rects: ~[Root<ClientRect>] = rects.iter().map(|r| {
             ClientRect::new(
-                win,
+                &*win,
                 r.origin.y,
                 r.origin.y + r.size.height,
                 r.origin.x,
-                r.origin.x + r.size.width)
+                r.origin.x + r.size.width).root()
         }).collect();
 
-        ClientRectList::new(win, rects)
+        ClientRectList::new(&*win, rects.iter().map(|rect| rect.deref().clone()).collect())
     }
 
     // http://dev.w3.org/csswg/cssom-view/#dom-element-getboundingclientrect
-    pub fn GetBoundingClientRect(&self, abstract_self: &JS<Element>) -> JS<ClientRect> {
-        let doc = self.node.owner_doc();
-        let win = &doc.get().window;
-        let node: JS<Node> = NodeCast::from(abstract_self);
+    fn GetBoundingClientRect(&self) -> Temporary<ClientRect> {
+        let win = window_from_node(self).root();
+        let node: &JSRef<Node> = NodeCast::from_ref(self);
         let rect = node.get_bounding_content_box();
         ClientRect::new(
-            win,
+            &*win,
             rect.origin.y,
             rect.origin.y + rect.size.height,
             rect.origin.x,
             rect.origin.x + rect.size.width)
     }
 
-    pub fn GetInnerHTML(&self, abstract_self: &JS<Element>) -> Fallible<DOMString> {
+    fn GetInnerHTML(&self) -> Fallible<DOMString> {
         //XXX TODO: XML case
-        Ok(serialize(&mut NodeIterator::new(NodeCast::from(abstract_self), false, false)))
+        Ok(serialize(&mut NodeIterator::new(NodeCast::from_ref(self), false, false)))
     }
 
-    pub fn GetOuterHTML(&self, abstract_self: &JS<Element>) -> Fallible<DOMString> {
-        Ok(serialize(&mut NodeIterator::new(NodeCast::from(abstract_self), true, false)))
+    fn GetOuterHTML(&self) -> Fallible<DOMString> {
+        Ok(serialize(&mut NodeIterator::new(NodeCast::from_ref(self), true, false)))
     }
 
-    pub fn Children(&self, abstract_self: &JS<Element>) -> JS<HTMLCollection> {
-        let doc = self.node.owner_doc();
-        let doc = doc.get();
-        HTMLCollection::children(&doc.window, &NodeCast::from(abstract_self))
+    fn Children(&self) -> Temporary<HTMLCollection> {
+        let window = window_from_node(self).root();
+        HTMLCollection::children(&*window, NodeCast::from_ref(self))
     }
 }
 
@@ -660,10 +693,10 @@ pub fn get_attribute_parts(name: DOMString) -> (Option<~str>, ~str) {
     (prefix, local_name)
 }
 
-impl VirtualMethods for JS<Element> {
-    fn super_type(&self) -> Option<~VirtualMethods:> {
-        let node: JS<Node> = NodeCast::from(self);
-        Some(~node as ~VirtualMethods:)
+impl<'a> VirtualMethods for JSRef<'a, Element> {
+    fn super_type<'a>(&'a mut self) -> Option<&'a mut VirtualMethods:> {
+        let node: &mut JSRef<Node> = NodeCast::from_mut_ref(self);
+        Some(node as &mut VirtualMethods:)
     }
 
     fn after_set_attr(&mut self, name: DOMString, value: DOMString) {
@@ -672,19 +705,18 @@ impl VirtualMethods for JS<Element> {
             _ => (),
         }
 
-        let node: JS<Node> = NodeCast::from(self);
         match name.as_slice() {
             "style" => {
-                let doc = node.get().owner_doc();
-                let base_url = doc.get().url().clone();
-                self.get_mut().style_attribute = Some(style::parse_style_attribute(value, &base_url))
+                let doc = document_from_node(self).root();
+                let base_url = doc.deref().url().clone();
+                self.deref_mut().style_attribute = Some(style::parse_style_attribute(value, &base_url))
             }
-            "id" if node.is_in_doc() => {
-                // XXX: this dual declaration are workaround to avoid the compile error:
-                // "borrowed value does not live long enough"
-                let mut doc = node.get().owner_doc().clone();
-                let doc = doc.get_mut();
-                doc.register_named_element(self, value.clone());
+            "id" => {
+                let node: &JSRef<Node> = NodeCast::from_ref(self);
+                if node.is_in_doc() {
+                    let mut doc = document_from_node(self).root();
+                    doc.register_named_element(self, value.clone());
+                }
             }
             _ => ()
         }
@@ -698,17 +730,16 @@ impl VirtualMethods for JS<Element> {
             _ => (),
         }
 
-        let node: JS<Node> = NodeCast::from(self);
         match name.as_slice() {
             "style" => {
-                self.get_mut().style_attribute = None
+                self.deref_mut().style_attribute = None
             }
-            "id" if node.is_in_doc() => {
-                // XXX: this dual declaration are workaround to avoid the compile error:
-                // "borrowed value does not live long enough"
-                let mut doc = node.get().owner_doc().clone();
-                let doc = doc.get_mut();
-                doc.unregister_named_element(self, value);
+            "id" => {
+                let node: &JSRef<Node> = NodeCast::from_ref(self);
+                if node.is_in_doc() {
+                    let mut doc = document_from_node(self).root();
+                    doc.unregister_named_element(self, value);
+                }
             }
             _ => ()
         }
@@ -722,10 +753,10 @@ impl VirtualMethods for JS<Element> {
             _ => (),
         }
 
-        match self.get_attribute(Null, "id") {
+        match self.get_attribute(Null, "id").root() {
             Some(attr) => {
-                let mut doc = document_from_node(self);
-                doc.get_mut().register_named_element(self, attr.get().Value());
+                let mut doc = document_from_node(self).root();
+                doc.register_named_element(self, attr.deref().Value());
             }
             _ => ()
         }
@@ -737,10 +768,10 @@ impl VirtualMethods for JS<Element> {
             _ => (),
         }
 
-        match self.get_attribute(Null, "id") {
+        match self.get_attribute(Null, "id").root() {
             Some(attr) => {
-                let mut doc = document_from_node(self);
-                doc.get_mut().unregister_named_element(self, attr.get().Value());
+                let mut doc = document_from_node(self).root();
+                doc.unregister_named_element(self, attr.deref().Value());
             }
             _ => ()
         }

src/components/script/dom/event.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::EventBinding;
 use dom::bindings::codegen::BindingDeclarations::EventBinding::EventConstants;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Temporary};
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
 use dom::bindings::error::Fallible;
 use dom::eventtarget::EventTarget;
@@ -80,63 +80,89 @@ impl Event {
         }
     }
 
-    pub fn new(window: &JS<Window>) -> JS<Event> {
+    pub fn new(window: &JSRef<Window>) -> Temporary<Event> {
         reflect_dom_object(~Event::new_inherited(HTMLEventTypeId),
                            window,
                            EventBinding::Wrap)
     }
 
-    pub fn EventPhase(&self) -> u16 {
+    pub fn Constructor(global: &JSRef<Window>,
+                       type_: DOMString,
+                       init: &EventBinding::EventInit) -> Fallible<Temporary<Event>> {
+        let mut ev = Event::new(global).root();
+        ev.InitEvent(type_, init.bubbles, init.cancelable);
+        Ok(Temporary::from_rooted(&*ev))
+    }
+}
+
+pub trait EventMethods {
+    fn EventPhase(&self) -> u16;
+    fn Type(&self) -> DOMString;
+    fn GetTarget(&self) -> Option<Temporary<EventTarget>>;
+    fn GetCurrentTarget(&self) -> Option<Temporary<EventTarget>>;
+    fn DefaultPrevented(&self) -> bool;
+    fn PreventDefault(&mut self);
+    fn StopPropagation(&mut self);
+    fn StopImmediatePropagation(&mut self);
+    fn Bubbles(&self) -> bool;
+    fn Cancelable(&self) -> bool;
+    fn TimeStamp(&self) -> u64;
+    fn InitEvent(&mut self, type_: DOMString, bubbles: bool, cancelable: bool);
+    fn IsTrusted(&self) -> bool;
+}
+
+impl<'a> EventMethods for JSRef<'a, Event> {
+    fn EventPhase(&self) -> u16 {
         self.phase as u16
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         self.type_.clone()
     }
 
-    pub fn GetTarget(&self) -> Option<JS<EventTarget>> {
-        self.target.clone()
+    fn GetTarget(&self) -> Option<Temporary<EventTarget>> {
+        self.target.as_ref().map(|target| Temporary::new(target.clone()))
     }
 
-    pub fn GetCurrentTarget(&self) -> Option<JS<EventTarget>> {
-        self.current_target.clone()
+    fn GetCurrentTarget(&self) -> Option<Temporary<EventTarget>> {
+        self.current_target.as_ref().map(|target| Temporary::new(target.clone()))
     }
 
-    pub fn DefaultPrevented(&self) -> bool {
+    fn DefaultPrevented(&self) -> bool {
         self.canceled
     }
 
-    pub fn PreventDefault(&mut self) {
+    fn PreventDefault(&mut self) {
         if self.cancelable {
             self.canceled = true
         }
     }
 
-    pub fn StopPropagation(&mut self) {
+    fn StopPropagation(&mut self) {
         self.stop_propagation = true;
     }
 
-    pub fn StopImmediatePropagation(&mut self) {
+    fn StopImmediatePropagation(&mut self) {
         self.stop_immediate = true;
         self.stop_propagation = true;
     }
 
-    pub fn Bubbles(&self) -> bool {
+    fn Bubbles(&self) -> bool {
         self.bubbles
     }
 
-    pub fn Cancelable(&self) -> bool {
+    fn Cancelable(&self) -> bool {
         self.cancelable
     }
 
-    pub fn TimeStamp(&self) -> u64 {
+    fn TimeStamp(&self) -> u64 {
         self.timestamp
     }
 
-    pub fn InitEvent(&mut self,
-                     type_: DOMString,
-                     bubbles: bool,
-                     cancelable: bool) {
+    fn InitEvent(&mut self,
+                 type_: DOMString,
+                 bubbles: bool,
+                 cancelable: bool) {
         self.initialized = true;
         if self.dispatching {
             return;
@@ -151,17 +177,9 @@ impl Event {
         self.cancelable = cancelable;
     }
 
-    pub fn IsTrusted(&self) -> bool {
+    fn IsTrusted(&self) -> bool {
         self.trusted
     }
-
-    pub fn Constructor(global: &JS<Window>,
-                       type_: DOMString,
-                       init: &EventBinding::EventInit) -> Fallible<JS<Event>> {
-        let mut ev = Event::new(global);
-        ev.get_mut().InitEvent(type_, init.bubbles, init.cancelable);
-        Ok(ev)
-    }
 }
 
 impl Reflectable for Event {

src/components/script/dom/eventdispatcher.rs

@@ -4,58 +4,59 @@
 
 use dom::bindings::callback::ReportExceptions;
 use dom::bindings::codegen::InheritTypes::{EventTargetCast, NodeCast, NodeDerived};
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, OptionalSettable, Root};
 use dom::eventtarget::{Capturing, Bubbling, EventTarget};
-use dom::event::{Event, PhaseAtTarget, PhaseNone, PhaseBubbling, PhaseCapturing};
+use dom::event::{Event, PhaseAtTarget, PhaseNone, PhaseBubbling, PhaseCapturing, EventMethods};
 use dom::node::{Node, NodeHelpers};
 
 // See http://dom.spec.whatwg.org/#concept-event-dispatch for the full dispatch algorithm
-pub fn dispatch_event(target: &JS<EventTarget>,
-                      pseudo_target: Option<JS<EventTarget>>,
-                      event: &mut JS<Event>) -> bool {
-    assert!(!event.get().dispatching);
+pub fn dispatch_event<'a, 'b>(target: &JSRef<'a, EventTarget>,
+                              pseudo_target: Option<JSRef<'b, EventTarget>>,
+                              event: &mut JSRef<Event>) -> bool {
+    assert!(!event.deref().dispatching);
 
     {
-        let event = event.get_mut();
-        event.target = pseudo_target.or_else(|| {
-            Some(target.clone())
-        });
+        let event = event.deref_mut();
+        event.target.assign(Some(match pseudo_target {
+            Some(pseudo_target) => pseudo_target,
+            None => target.clone(),
+        }));
         event.dispatching = true;
     }
 
-    let type_ = event.get().type_.clone();
+    let type_ = event.deref().type_.clone();
 
     //TODO: no chain if not participating in a tree
-    let chain: Vec<JS<EventTarget>> = if target.get().is_node() {
-        let target_node: JS<Node> = NodeCast::to(target).unwrap();
+    let mut chain: Vec<Root<EventTarget>> = if target.deref().is_node() {
+        let target_node: &JSRef<Node> = NodeCast::to_ref(target).unwrap();
         target_node.ancestors().map(|ancestor| {
-            let ancestor_target: JS<EventTarget> = EventTargetCast::from(&ancestor);
-            ancestor_target
+            let ancestor_target: &JSRef<EventTarget> = EventTargetCast::from_ref(&ancestor);
+            ancestor_target.unrooted().root()
         }).collect()
     } else {
         vec!()
     };
 
-    event.get_mut().phase = PhaseCapturing;
+    event.deref_mut().phase = PhaseCapturing;
 
     //FIXME: The "callback this value" should be currentTarget
 
     /* capturing */
     for cur_target in chain.as_slice().rev_iter() {
-        let stopped = match cur_target.get().get_listeners_for(type_, Capturing) {
+        let stopped = match cur_target.get_listeners_for(type_, Capturing) {
             Some(listeners) => {
-                event.get_mut().current_target = Some(cur_target.clone());
+                event.current_target.assign(Some(cur_target.deref().clone()));
                 for listener in listeners.iter() {
                     //FIXME: this should have proper error handling, or explicitly
                     //       drop the exception on the floor
                     assert!(listener.HandleEvent__(event, ReportExceptions).is_ok());
 
-                    if event.get().stop_immediate {
+                    if event.deref().stop_immediate {
                         break;
                     }
                 }
 
-                event.get().stop_propagation
+                event.deref().stop_propagation
             }
             None => false
         };
@@ -66,20 +67,20 @@ pub fn dispatch_event(target: &JS<EventTarget>,
     }
 
     /* at target */
-    if !event.get().stop_propagation {
+    if !event.deref().stop_propagation {
         {
-            let event = event.get_mut();
+            let event = event.deref_mut();
             event.phase = PhaseAtTarget;
-            event.current_target = Some(target.clone());
+            event.current_target.assign(Some(target.clone()));
         }
 
-        let opt_listeners = target.get().get_listeners(type_);
+        let opt_listeners = target.deref().get_listeners(type_);
         for listeners in opt_listeners.iter() {
             for listener in listeners.iter() {
                 //FIXME: this should have proper error handling, or explicitly drop the
                 //       exception on the floor.
                 assert!(listener.HandleEvent__(event, ReportExceptions).is_ok());
-                if event.get().stop_immediate {
+                if event.deref().stop_immediate {
                     break;
                 }
             }
@@ -87,24 +88,24 @@ pub fn dispatch_event(target: &JS<EventTarget>,
     }
 
     /* bubbling */
-    if event.get().bubbles && !event.get().stop_propagation {
-        event.get_mut().phase = PhaseBubbling;
+    if event.deref().bubbles && !event.deref().stop_propagation {
+        event.deref_mut().phase = PhaseBubbling;
 
         for cur_target in chain.iter() {
-            let stopped = match cur_target.get().get_listeners_for(type_, Bubbling) {
+            let stopped = match cur_target.deref().get_listeners_for(type_, Bubbling) {
                 Some(listeners) => {
-                    event.get_mut().current_target = Some(cur_target.clone());
+                    event.deref_mut().current_target.assign(Some(cur_target.deref().clone()));
                     for listener in listeners.iter() {
                         //FIXME: this should have proper error handling or explicitly
                         //       drop exceptions on the floor.
                         assert!(listener.HandleEvent__(event, ReportExceptions).is_ok());
 
-                        if event.get().stop_immediate {
+                        if event.deref().stop_immediate {
                             break;
                         }
                     }
 
-                    event.get().stop_propagation
+                    event.deref().stop_propagation
                 }
                 None => false
             };
@@ -114,7 +115,12 @@ pub fn dispatch_event(target: &JS<EventTarget>,
         }
     }
 
-    let event = event.get_mut();
+    // Root ordering restrictions mean we need to unroot the chain entries
+    // in the same order they were rooted.
+    while chain.len() > 0 {
+        let _ = chain.pop();
+    }
+
     event.dispatching = false;
     event.phase = PhaseNone;
     event.current_target = None;

src/components/script/dom/eventtarget.rs

@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use dom::bindings::js::JS;
+use dom::bindings::js::JSRef;
 use dom::bindings::utils::{Reflectable, Reflector};
 use dom::bindings::error::{Fallible, InvalidState};
 use dom::bindings::codegen::BindingDeclarations::EventListenerBinding;
@@ -64,11 +64,42 @@ impl EventTarget {
             filtered.map(|entry| entry.listener).collect()
         })
     }
+}
 
-    pub fn AddEventListener(&mut self,
-                            ty: DOMString,
-                            listener: Option<EventListener>,
-                            capture: bool) {
+pub trait EventTargetHelpers {
+    fn dispatch_event_with_target<'a>(&self,
+                                      target: Option<JSRef<'a, EventTarget>>,
+                                      event: &mut JSRef<Event>) -> Fallible<bool>;
+}
+
+impl<'a> EventTargetHelpers for JSRef<'a, EventTarget> {
+    fn dispatch_event_with_target<'b>(&self,
+                                      target: Option<JSRef<'b, EventTarget>>,
+                                      event: &mut JSRef<Event>) -> Fallible<bool> {
+        if event.deref().dispatching || !event.deref().initialized {
+            return Err(InvalidState);
+        }
+        Ok(dispatch_event(self, target, event))
+    }
+}
+
+pub trait EventTargetMethods {
+    fn AddEventListener(&mut self,
+                        ty: DOMString,
+                        listener: Option<EventListener>,
+                        capture: bool);
+    fn RemoveEventListener(&mut self,
+                           ty: DOMString,
+                           listener: Option<EventListener>,
+                           capture: bool);
+    fn DispatchEvent(&self, event: &mut JSRef<Event>) -> Fallible<bool>;
+}
+
+impl<'a> EventTargetMethods for JSRef<'a, EventTarget> {
+    fn AddEventListener(&mut self,
+                        ty: DOMString,
+                        listener: Option<EventListener>,
+                        capture: bool) {
         for &listener in listener.iter() {
             let entry = self.handlers.find_or_insert_with(ty.clone(), |_| vec!());
             let phase = if capture { Capturing } else { Bubbling };
@@ -82,10 +113,10 @@ impl EventTarget {
         }
     }
 
-    pub fn RemoveEventListener(&mut self,
-                               ty: DOMString,
-                               listener: Option<EventListener>,
-                               capture: bool) {
+    fn RemoveEventListener(&mut self,
+                           ty: DOMString,
+                           listener: Option<EventListener>,
+                           capture: bool) {
         for &listener in listener.iter() {
             let mut entry = self.handlers.find_mut(&ty);
             for entry in entry.mut_iter() {
@@ -102,19 +133,8 @@ impl EventTarget {
         }
     }
 
-    pub fn DispatchEvent(&self, abstract_self: &JS<EventTarget>,
-                         event: &mut JS<Event>) -> Fallible<bool> {
-        self.dispatch_event_with_target(abstract_self, None, event)
-    }
-
-    pub fn dispatch_event_with_target(&self,
-                                      abstract_self: &JS<EventTarget>,
-                                      abstract_target: Option<JS<EventTarget>>,
-                                      event: &mut JS<Event>) -> Fallible<bool> {
-        if event.get().dispatching || !event.get().initialized {
-            return Err(InvalidState);
-        }
-        Ok(dispatch_event(abstract_self, abstract_target, event))
+    fn DispatchEvent(&self, event: &mut JSRef<Event>) -> Fallible<bool> {
+        self.dispatch_event_with_target(None, event)
     }
 }
 
@@ -128,8 +148,8 @@ impl Reflectable for EventTarget {
     }
 }
 
-impl VirtualMethods for JS<EventTarget> {
-    fn super_type(&self) -> Option<~VirtualMethods:> {
+impl<'a> VirtualMethods for JSRef<'a, EventTarget> {
+    fn super_type<'a>(&'a mut self) -> Option<&'a mut VirtualMethods:> {
         None
     }
 }

src/components/script/dom/formdata.rs

@@ -5,7 +5,7 @@
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
 use dom::bindings::error::{Fallible};
 use dom::bindings::codegen::BindingDeclarations::FormDataBinding;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Temporary, OptionalUnrootable};
 use dom::blob::Blob;
 use dom::htmlformelement::HTMLFormElement;
 use dom::window::Window;
@@ -28,33 +28,39 @@ pub struct FormData {
 }
 
 impl FormData {
-    pub fn new_inherited(form: Option<JS<HTMLFormElement>>, window: JS<Window>) -> FormData {
+    pub fn new_inherited(form: Option<JSRef<HTMLFormElement>>, window: &JSRef<Window>) -> FormData {
         FormData {
             data: HashMap::new(),
             reflector_: Reflector::new(),
-            window: window,
-            form: form
+            window: window.unrooted(),
+            form: form.unrooted(),
         }
     }
 
-    pub fn new(form: Option<JS<HTMLFormElement>>, window: &JS<Window>) -> JS<FormData> {
-        reflect_dom_object(~FormData::new_inherited(form, window.clone()), window, FormDataBinding::Wrap)
+    pub fn new(form: Option<JSRef<HTMLFormElement>>, window: &JSRef<Window>) -> Temporary<FormData> {
+        reflect_dom_object(~FormData::new_inherited(form, window), window, FormDataBinding::Wrap)
     }
 
-    pub fn Constructor(window: &JS<Window>, form: Option<JS<HTMLFormElement>>)
-                       -> Fallible<JS<FormData>> {
+    pub fn Constructor(window: &JSRef<Window>, form: Option<JSRef<HTMLFormElement>>) -> Fallible<Temporary<FormData>> {
         Ok(FormData::new(form, window))
     }
+}
 
-    pub fn Append(&mut self, name: DOMString, value: &JS<Blob>, filename: Option<DOMString>) {
+pub trait FormDataMethods {
+    fn Append(&mut self, name: DOMString, value: &JSRef<Blob>, filename: Option<DOMString>);
+    fn Append_(&mut self, name: DOMString, value: DOMString);
+}
+
+impl<'a> FormDataMethods for JSRef<'a, FormData> {
+    fn Append(&mut self, name: DOMString, value: &JSRef<Blob>, filename: Option<DOMString>) {
         let blob = BlobData {
-            blob: value.clone(),
+            blob: value.unrooted(),
             name: filename.unwrap_or(~"default")
         };
         self.data.insert(name.clone(), blob);
     }
 
-    pub fn Append_(&mut self, name: DOMString, value: DOMString) {
+    fn Append_(&mut self, name: DOMString, value: DOMString) {
         self.data.insert(name, StringData(value));
     }
 }

src/components/script/dom/htmlanchorelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLAnchorElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLAnchorElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLAnchorElementTypeId;
@@ -28,120 +28,149 @@ impl HTMLAnchorElementDerived for EventTarget {
 }
 
 impl HTMLAnchorElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLAnchorElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLAnchorElement {
         HTMLAnchorElement {
             htmlelement: HTMLElement::new_inherited(HTMLAnchorElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLAnchorElement> {
-        let element = HTMLAnchorElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLAnchorElement> {
+        let element = HTMLAnchorElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLAnchorElementBinding::Wrap)
     }
 }
 
-impl HTMLAnchorElement {
-    pub fn Href(&self) -> DOMString {
+pub trait HTMLAnchorElementMethods {
+    fn Href(&self) -> DOMString;
+    fn SetHref(&mut self, _href: DOMString) -> ErrorResult;
+    fn Target(&self) -> DOMString;
+    fn SetTarget(&self, _target: DOMString) -> ErrorResult;
+    fn Download(&self) -> DOMString;
+    fn SetDownload(&self, _download: DOMString) -> ErrorResult;
+    fn Ping(&self) -> DOMString;
+    fn SetPing(&self, _ping: DOMString) -> ErrorResult;
+    fn Rel(&self) -> DOMString;
+    fn SetRel(&self, _rel: DOMString) -> ErrorResult;
+    fn Hreflang(&self) -> DOMString;
+    fn SetHreflang(&self, _href_lang: DOMString) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult;
+    fn Text(&self) -> DOMString;
+    fn SetText(&mut self, _text: DOMString) -> ErrorResult;
+    fn Coords(&self) -> DOMString;
+    fn SetCoords(&mut self, _coords: DOMString) -> ErrorResult;
+    fn Charset(&self) -> DOMString;
+    fn SetCharset(&mut self, _charset: DOMString) -> ErrorResult;
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult;
+    fn Rev(&self) -> DOMString;
+    fn SetRev(&mut self, _rev: DOMString) -> ErrorResult;
+    fn Shape(&self) -> DOMString;
+    fn SetShape(&mut self, _shape: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLAnchorElementMethods for JSRef<'a, HTMLAnchorElement> {
+    fn Href(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetHref(&mut self, _href: DOMString) -> ErrorResult {
+    fn SetHref(&mut self, _href: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Target(&self) -> DOMString {
+    fn Target(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetTarget(&self, _target: DOMString) -> ErrorResult {
+    fn SetTarget(&self, _target: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Download(&self) -> DOMString {
+    fn Download(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetDownload(&self, _download: DOMString) -> ErrorResult {
+    fn SetDownload(&self, _download: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Ping(&self) -> DOMString {
+    fn Ping(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetPing(&self, _ping: DOMString) -> ErrorResult {
+    fn SetPing(&self, _ping: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Rel(&self) -> DOMString {
+    fn Rel(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetRel(&self, _rel: DOMString) -> ErrorResult {
+    fn SetRel(&self, _rel: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Hreflang(&self) -> DOMString {
+    fn Hreflang(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetHreflang(&self, _href_lang: DOMString) -> ErrorResult {
+    fn SetHreflang(&self, _href_lang: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetType(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Text(&self) -> DOMString {
+    fn Text(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetText(&mut self, _text: DOMString) -> ErrorResult {
+    fn SetText(&mut self, _text: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Coords(&self) -> DOMString {
+    fn Coords(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCoords(&mut self, _coords: DOMString) -> ErrorResult {
+    fn SetCoords(&mut self, _coords: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Charset(&self) -> DOMString {
+    fn Charset(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCharset(&mut self, _charset: DOMString) -> ErrorResult {
+    fn SetCharset(&mut self, _charset: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Name(&self) -> DOMString {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _name: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Rev(&self) -> DOMString {
+    fn Rev(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetRev(&mut self, _rev: DOMString) -> ErrorResult {
+    fn SetRev(&mut self, _rev: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Shape(&self) -> DOMString {
+    fn Shape(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetShape(&mut self, _shape: DOMString) -> ErrorResult {
+    fn SetShape(&mut self, _shape: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlappletelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLAppletElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLAppletElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLAppletElementTypeId;
@@ -28,104 +28,129 @@ impl HTMLAppletElementDerived for EventTarget {
 }
 
 impl HTMLAppletElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLAppletElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLAppletElement {
         HTMLAppletElement {
             htmlelement: HTMLElement::new_inherited(HTMLAppletElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLAppletElement> {
-        let element = HTMLAppletElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLAppletElement> {
+        let element = HTMLAppletElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLAppletElementBinding::Wrap)
     }
 }
 
-impl HTMLAppletElement {
-    pub fn Align(&self) -> DOMString {
+pub trait HTMLAppletElementMethods {
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult;
+    fn Alt(&self) -> DOMString;
+    fn SetAlt(&self, _alt: DOMString) -> ErrorResult;
+    fn Archive(&self) -> DOMString;
+    fn SetArchive(&self, _archive: DOMString) -> ErrorResult;
+    fn Code(&self) -> DOMString;
+    fn SetCode(&self, _code: DOMString) -> ErrorResult;
+    fn CodeBase(&self) -> DOMString;
+    fn SetCodeBase(&self, _code_base: DOMString) -> ErrorResult;
+    fn Height(&self) -> DOMString;
+    fn SetHeight(&self, _height: DOMString) -> ErrorResult;
+    fn Hspace(&self) -> u32;
+    fn SetHspace(&mut self, _hspace: u32) -> ErrorResult;
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult;
+    fn Object(&self) -> DOMString;
+    fn SetObject(&mut self, _object: DOMString) -> ErrorResult;
+    fn Vspace(&self) -> u32;
+    fn SetVspace(&mut self, _vspace: u32) -> ErrorResult;
+    fn Width(&self) -> DOMString;
+    fn SetWidth(&mut self, _width: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLAppletElementMethods for JSRef<'a, HTMLAppletElement> {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Alt(&self) -> DOMString {
+    fn Alt(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlt(&self, _alt: DOMString) -> ErrorResult {
+    fn SetAlt(&self, _alt: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Archive(&self) -> DOMString {
+    fn Archive(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetArchive(&self, _archive: DOMString) -> ErrorResult {
+    fn SetArchive(&self, _archive: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Code(&self) -> DOMString {
+    fn Code(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCode(&self, _code: DOMString) -> ErrorResult {
+    fn SetCode(&self, _code: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn CodeBase(&self) -> DOMString {
+    fn CodeBase(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCodeBase(&self, _code_base: DOMString) -> ErrorResult {
+    fn SetCodeBase(&self, _code_base: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Height(&self) -> DOMString {
+    fn Height(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetHeight(&self, _height: DOMString) -> ErrorResult {
+    fn SetHeight(&self, _height: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Hspace(&self) -> u32 {
+    fn Hspace(&self) -> u32 {
         0
     }
 
-    pub fn SetHspace(&mut self, _hspace: u32) -> ErrorResult {
+    fn SetHspace(&mut self, _hspace: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Name(&self) -> DOMString {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _name: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Object(&self) -> DOMString {
+    fn Object(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetObject(&mut self, _object: DOMString) -> ErrorResult {
+    fn SetObject(&mut self, _object: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Vspace(&self) -> u32 {
+    fn Vspace(&self) -> u32 {
         0
     }
 
-    pub fn SetVspace(&mut self, _vspace: u32) -> ErrorResult {
+    fn SetVspace(&mut self, _vspace: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Width(&self) -> DOMString {
+    fn Width(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetWidth(&mut self, _width: DOMString) -> ErrorResult {
+    fn SetWidth(&mut self, _width: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlareaelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLAreaElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLAreaElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLAreaElementTypeId;
@@ -28,80 +28,99 @@ impl HTMLAreaElementDerived for EventTarget {
 }
 
 impl HTMLAreaElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLAreaElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLAreaElement {
         HTMLAreaElement {
             htmlelement: HTMLElement::new_inherited(HTMLAreaElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLAreaElement> {
-        let element = HTMLAreaElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLAreaElement> {
+        let element = HTMLAreaElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLAreaElementBinding::Wrap)
     }
 }
 
-impl HTMLAreaElement {
-    pub fn Alt(&self) -> DOMString {
+pub trait HTMLAreaElementMethods {
+    fn Alt(&self) -> DOMString;
+    fn SetAlt(&self, _alt: DOMString) -> ErrorResult;
+    fn Coords(&self) -> DOMString;
+    fn SetCoords(&self, _coords: DOMString) -> ErrorResult;
+    fn Shape(&self) -> DOMString;
+    fn SetShape(&self, _shape: DOMString) -> ErrorResult;
+    fn Href(&self) -> DOMString;
+    fn SetHref(&self, _href: DOMString) -> ErrorResult;
+    fn Target(&self) -> DOMString;
+    fn SetTarget(&self, _target: DOMString) -> ErrorResult;
+    fn Download(&self) -> DOMString;
+    fn SetDownload(&self, _download: DOMString) -> ErrorResult;
+    fn Ping(&self) -> DOMString;
+    fn SetPing(&self, _ping: DOMString) -> ErrorResult;
+    fn NoHref(&self) -> bool;
+    fn SetNoHref(&mut self, _no_href: bool) -> ErrorResult;
+}
+
+impl<'a> HTMLAreaElementMethods for JSRef<'a, HTMLAreaElement> {
+    fn Alt(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlt(&self, _alt: DOMString) -> ErrorResult {
+    fn SetAlt(&self, _alt: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Coords(&self) -> DOMString {
+    fn Coords(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCoords(&self, _coords: DOMString) -> ErrorResult {
+    fn SetCoords(&self, _coords: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Shape(&self) -> DOMString {
+    fn Shape(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetShape(&self, _shape: DOMString) -> ErrorResult {
+    fn SetShape(&self, _shape: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Href(&self) -> DOMString {
+    fn Href(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetHref(&self, _href: DOMString) -> ErrorResult {
+    fn SetHref(&self, _href: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Target(&self) -> DOMString {
+    fn Target(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetTarget(&self, _target: DOMString) -> ErrorResult {
+    fn SetTarget(&self, _target: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Download(&self) -> DOMString {
+    fn Download(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetDownload(&self, _download: DOMString) -> ErrorResult {
+    fn SetDownload(&self, _download: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Ping(&self) -> DOMString {
+    fn Ping(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetPing(&self, _ping: DOMString) -> ErrorResult {
+    fn SetPing(&self, _ping: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn NoHref(&self) -> bool {
+    fn NoHref(&self) -> bool {
         false
     }
 
-    pub fn SetNoHref(&mut self, _no_href: bool) -> ErrorResult {
+    fn SetNoHref(&mut self, _no_href: bool) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlaudioelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLAudioElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLAudioElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::element::HTMLAudioElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
@@ -27,14 +27,17 @@ impl HTMLAudioElementDerived for EventTarget {
 }
 
 impl HTMLAudioElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLAudioElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLAudioElement {
         HTMLAudioElement {
             htmlmediaelement: HTMLMediaElement::new_inherited(HTMLAudioElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLAudioElement> {
-        let element = HTMLAudioElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLAudioElement> {
+        let element = HTMLAudioElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLAudioElementBinding::Wrap)
     }
 }
+
+pub trait HTMLAudioElementMethods {
+}

src/components/script/dom/htmlbaseelement.rs

@@ -5,7 +5,7 @@
 use dom::bindings::codegen::BindingDeclarations::HTMLBaseElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLBaseElementDerived;
 use dom::bindings::error::ErrorResult;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::element::HTMLBaseElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
@@ -28,32 +28,39 @@ impl HTMLBaseElementDerived for EventTarget {
 }
 
 impl HTMLBaseElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLBaseElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLBaseElement {
         HTMLBaseElement {
             htmlelement: HTMLElement::new_inherited(HTMLBaseElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLBaseElement> {
-        let element = HTMLBaseElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLBaseElement> {
+        let element = HTMLBaseElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLBaseElementBinding::Wrap)
     }
 }
 
-impl HTMLBaseElement {
-    pub fn Href(&self) -> DOMString {
+pub trait HTMLBaseElementMethods {
+    fn Href(&self) -> DOMString;
+    fn SetHref(&self, _href: DOMString) -> ErrorResult;
+    fn Target(&self) -> DOMString;
+    fn SetTarget(&self, _target: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLBaseElementMethods for JSRef<'a, HTMLBaseElement> {
+    fn Href(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetHref(&self, _href: DOMString) -> ErrorResult {
+    fn SetHref(&self, _href: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Target(&self) -> DOMString {
+    fn Target(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetTarget(&self, _target: DOMString) -> ErrorResult {
+    fn SetTarget(&self, _target: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlbodyelement.rs

@@ -5,7 +5,7 @@
 use dom::bindings::codegen::BindingDeclarations::HTMLBodyElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLBodyElementDerived;
 use dom::bindings::error::ErrorResult;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::element::HTMLBodyElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
@@ -28,64 +28,79 @@ impl HTMLBodyElementDerived for EventTarget {
 }
 
 impl HTMLBodyElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLBodyElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLBodyElement {
         HTMLBodyElement {
             htmlelement: HTMLElement::new_inherited(HTMLBodyElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLBodyElement> {
-        let element = HTMLBodyElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLBodyElement> {
+        let element = HTMLBodyElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLBodyElementBinding::Wrap)
     }
 }
 
-impl HTMLBodyElement {
-    pub fn Text(&self) -> DOMString {
+pub trait HTMLBodyElementMethods {
+    fn Text(&self) -> DOMString;
+    fn SetText(&mut self, _text: DOMString) -> ErrorResult;
+    fn Link(&self) -> DOMString;
+    fn SetLink(&self, _link: DOMString) -> ErrorResult;
+    fn VLink(&self) -> DOMString;
+    fn SetVLink(&self, _v_link: DOMString) -> ErrorResult;
+    fn ALink(&self) -> DOMString;
+    fn SetALink(&self, _a_link: DOMString) -> ErrorResult;
+    fn BgColor(&self) -> DOMString;
+    fn SetBgColor(&self, _bg_color: DOMString) -> ErrorResult;
+    fn Background(&self) -> DOMString;
+    fn SetBackground(&self, _background: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLBodyElementMethods for JSRef<'a, HTMLBodyElement> {
+    fn Text(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetText(&mut self, _text: DOMString) -> ErrorResult {
+    fn SetText(&mut self, _text: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Link(&self) -> DOMString {
+    fn Link(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetLink(&self, _link: DOMString) -> ErrorResult {
+    fn SetLink(&self, _link: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn VLink(&self) -> DOMString {
+    fn VLink(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetVLink(&self, _v_link: DOMString) -> ErrorResult {
+    fn SetVLink(&self, _v_link: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn ALink(&self) -> DOMString {
+    fn ALink(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetALink(&self, _a_link: DOMString) -> ErrorResult {
+    fn SetALink(&self, _a_link: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn BgColor(&self) -> DOMString {
+    fn BgColor(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetBgColor(&self, _bg_color: DOMString) -> ErrorResult {
+    fn SetBgColor(&self, _bg_color: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Background(&self) -> DOMString {
+    fn Background(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetBackground(&self, _background: DOMString) -> ErrorResult {
+    fn SetBackground(&self, _background: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlbrelement.rs

@@ -5,7 +5,7 @@
 use dom::bindings::codegen::BindingDeclarations::HTMLBRElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLBRElementDerived;
 use dom::bindings::error::ErrorResult;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::element::HTMLBRElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
@@ -28,24 +28,29 @@ impl HTMLBRElementDerived for EventTarget {
 }
 
 impl HTMLBRElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLBRElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLBRElement {
         HTMLBRElement {
             htmlelement: HTMLElement::new_inherited(HTMLBRElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLBRElement> {
-        let element = HTMLBRElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLBRElement> {
+        let element = HTMLBRElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLBRElementBinding::Wrap)
     }
 }
 
-impl HTMLBRElement {
-    pub fn Clear(&self) -> DOMString {
+pub trait HTMLBRElementMethods {
+    fn Clear(&self) -> DOMString;
+    fn SetClear(&mut self, _text: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLBRElementMethods for JSRef<'a, HTMLBRElement> {
+    fn Clear(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetClear(&mut self, _text: DOMString) -> ErrorResult {
+    fn SetClear(&mut self, _text: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlbuttonelement.rs

@@ -4,14 +4,14 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLButtonElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLButtonElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLButtonElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
 use dom::htmlelement::HTMLElement;
 use dom::htmlformelement::HTMLFormElement;
-use dom::node::{Node, ElementNodeTypeId};
+use dom::node::{Node, ElementNodeTypeId, window_from_node};
 use dom::validitystate::ValidityState;
 use servo_util::str::DOMString;
 
@@ -30,131 +30,158 @@ impl HTMLButtonElementDerived for EventTarget {
 }
 
 impl HTMLButtonElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLButtonElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLButtonElement {
         HTMLButtonElement {
             htmlelement: HTMLElement::new_inherited(HTMLButtonElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLButtonElement> {
-        let element = HTMLButtonElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLButtonElement> {
+        let element = HTMLButtonElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLButtonElementBinding::Wrap)
     }
 }
 
-impl HTMLButtonElement {
-    pub fn Autofocus(&self) -> bool {
+pub trait HTMLButtonElementMethods {
+    fn Autofocus(&self) -> bool;
+    fn SetAutofocus(&mut self, _autofocus: bool) -> ErrorResult;
+    fn Disabled(&self) -> bool;
+    fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult;
+    fn GetForm(&self) -> Option<Temporary<HTMLFormElement>>;
+    fn FormAction(&self) -> DOMString;
+    fn SetFormAction(&mut self, _formaction: DOMString) -> ErrorResult;
+    fn FormEnctype(&self) -> DOMString;
+    fn SetFormEnctype(&mut self, _formenctype: DOMString) -> ErrorResult;
+    fn FormMethod(&self) -> DOMString;
+    fn SetFormMethod(&mut self, _formmethod: DOMString) -> ErrorResult;
+    fn FormNoValidate(&self) -> bool;
+    fn SetFormNoValidate(&mut self, _novalidate: bool) -> ErrorResult;
+    fn FormTarget(&self) -> DOMString;
+    fn SetFormTarget(&mut self, _formtarget: DOMString) -> ErrorResult;
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult;
+    fn Value(&self) -> DOMString;
+    fn SetValue(&mut self, _value: DOMString) -> ErrorResult;
+    fn WillValidate(&self) -> bool;
+    fn SetWillValidate(&mut self, _will_validate: bool);
+    fn Validity(&self) -> Temporary<ValidityState>;
+    fn ValidationMessage(&self) -> DOMString;
+    fn SetValidationMessage(&mut self, _message: DOMString) -> ErrorResult;
+    fn CheckValidity(&self) -> bool;
+    fn SetCustomValidity(&mut self, _error: DOMString);
+}
+
+impl<'a> HTMLButtonElementMethods for JSRef<'a, HTMLButtonElement> {
+    fn Autofocus(&self) -> bool {
         false
     }
 
-    pub fn SetAutofocus(&mut self, _autofocus: bool) -> ErrorResult {
+    fn SetAutofocus(&mut self, _autofocus: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Disabled(&self) -> bool {
+    fn Disabled(&self) -> bool {
         false
     }
 
-    pub fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult {
+    fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetForm(&self) -> Option<JS<HTMLFormElement>> {
+    fn GetForm(&self) -> Option<Temporary<HTMLFormElement>> {
         None
     }
 
-    pub fn FormAction(&self) -> DOMString {
+    fn FormAction(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetFormAction(&mut self, _formaction: DOMString) -> ErrorResult {
+    fn SetFormAction(&mut self, _formaction: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn FormEnctype(&self) -> DOMString {
+    fn FormEnctype(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetFormEnctype(&mut self, _formenctype: DOMString) -> ErrorResult {
+    fn SetFormEnctype(&mut self, _formenctype: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn FormMethod(&self) -> DOMString {
+    fn FormMethod(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetFormMethod(&mut self, _formmethod: DOMString) -> ErrorResult {
+    fn SetFormMethod(&mut self, _formmethod: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn FormNoValidate(&self) -> bool {
+    fn FormNoValidate(&self) -> bool {
         false
     }
 
-    pub fn SetFormNoValidate(&mut self, _novalidate: bool) -> ErrorResult {
+    fn SetFormNoValidate(&mut self, _novalidate: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn FormTarget(&self) -> DOMString {
+    fn FormTarget(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetFormTarget(&mut self, _formtarget: DOMString) -> ErrorResult {
+    fn SetFormTarget(&mut self, _formtarget: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Name(&self) -> DOMString {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _name: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetType(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Value(&self) -> DOMString {
+    fn Value(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetValue(&mut self, _value: DOMString) -> ErrorResult {
+    fn SetValue(&mut self, _value: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn WillValidate(&self) -> bool {
+    fn WillValidate(&self) -> bool {
         false
     }
 
-    pub fn SetWillValidate(&mut self, _will_validate: bool) {
+    fn SetWillValidate(&mut self, _will_validate: bool) {
     }
 
-    pub fn Validity(&self) -> JS<ValidityState> {
-        let doc = self.htmlelement.element.node.owner_doc();
-        let doc = doc.get();
-        ValidityState::new(&doc.window)
+    fn Validity(&self) -> Temporary<ValidityState> {
+        let window = window_from_node(self).root();
+        ValidityState::new(&*window)
     }
 
-    pub fn SetValidity(&mut self, _validity: JS<ValidityState>) {
-    }
-
-    pub fn ValidationMessage(&self) -> DOMString {
+    fn ValidationMessage(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetValidationMessage(&mut self, _message: DOMString) -> ErrorResult {
+    fn SetValidationMessage(&mut self, _message: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn CheckValidity(&self) -> bool {
+    fn CheckValidity(&self) -> bool {
         true
     }
 
-    pub fn SetCustomValidity(&mut self, _error: DOMString) {
+    fn SetCustomValidity(&mut self, _error: DOMString) {
     }
 }

src/components/script/dom/htmlcanvaselement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLCanvasElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLCanvasElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::{ErrorResult};
 use dom::document::Document;
 use dom::element::HTMLCanvasElementTypeId;
@@ -28,32 +28,39 @@ impl HTMLCanvasElementDerived for EventTarget {
 }
 
 impl HTMLCanvasElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLCanvasElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLCanvasElement {
         HTMLCanvasElement {
             htmlelement: HTMLElement::new_inherited(HTMLCanvasElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLCanvasElement> {
-        let element = HTMLCanvasElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLCanvasElement> {
+        let element = HTMLCanvasElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLCanvasElementBinding::Wrap)
     }
 }
 
-impl HTMLCanvasElement {
-    pub fn Width(&self) -> u32 {
+pub trait HTMLCanvasElementMethods {
+    fn Width(&self) -> u32;
+    fn SetWidth(&mut self, _width: u32) -> ErrorResult;
+    fn Height(&self) -> u32;
+    fn SetHeight(&mut self, _height: u32) -> ErrorResult;
+}
+
+impl<'a> HTMLCanvasElementMethods for JSRef<'a, HTMLCanvasElement> {
+    fn Width(&self) -> u32 {
         0
     }
 
-    pub fn SetWidth(&mut self, _width: u32) -> ErrorResult {
+    fn SetWidth(&mut self, _width: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Height(&self) -> u32 {
+    fn Height(&self) -> u32 {
         0
     }
 
-    pub fn SetHeight(&mut self, _height: u32) -> ErrorResult {
+    fn SetHeight(&mut self, _height: u32) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlcollection.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::InheritTypes::{ElementCast, NodeCast};
 use dom::bindings::codegen::BindingDeclarations::HTMLCollectionBinding;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Temporary};
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
 use dom::element::{Element, AttributeHandlers};
 use dom::node::{Node, NodeHelpers};
@@ -15,7 +15,7 @@ use servo_util::str::{DOMString, split_html_space_chars};
 use serialize::{Encoder, Encodable};
 
 pub trait CollectionFilter {
-    fn filter(&self, elem: &JS<Element>, root: &JS<Node>) -> bool;
+    fn filter(&self, elem: &JSRef<Element>, root: &JSRef<Node>) -> bool;
 }
 
 impl<S: Encoder<E>, E> Encodable<S, E> for ~CollectionFilter {
@@ -38,33 +38,33 @@ pub struct HTMLCollection {
 }
 
 impl HTMLCollection {
-    pub fn new_inherited(window: JS<Window>, collection: CollectionTypeId) -> HTMLCollection {
+    pub fn new_inherited(window: &JSRef<Window>, collection: CollectionTypeId) -> HTMLCollection {
         HTMLCollection {
             collection: collection,
             reflector_: Reflector::new(),
-            window: window,
+            window: window.unrooted(),
         }
     }
 
-    pub fn new(window: &JS<Window>, collection: CollectionTypeId) -> JS<HTMLCollection> {
-        reflect_dom_object(~HTMLCollection::new_inherited(window.clone(), collection),
+    pub fn new(window: &JSRef<Window>, collection: CollectionTypeId) -> Temporary<HTMLCollection> {
+        reflect_dom_object(~HTMLCollection::new_inherited(window, collection),
                            window, HTMLCollectionBinding::Wrap)
     }
 }
 
 impl HTMLCollection {
-    pub fn create(window: &JS<Window>, root: &JS<Node>, filter: ~CollectionFilter) -> JS<HTMLCollection> {
-        HTMLCollection::new(window, Live(root.clone(), filter))
+    pub fn create(window: &JSRef<Window>, root: &JSRef<Node>, filter: ~CollectionFilter) -> Temporary<HTMLCollection> {
+        HTMLCollection::new(window, Live(root.unrooted(), filter))
     }
 
-    pub fn by_tag_name(window: &JS<Window>, root: &JS<Node>, tag: DOMString)
-                       -> JS<HTMLCollection> {
+    pub fn by_tag_name(window: &JSRef<Window>, root: &JSRef<Node>, tag: DOMString)
+                       -> Temporary<HTMLCollection> {
         struct TagNameFilter {
             tag: DOMString
         }
         impl CollectionFilter for TagNameFilter {
-            fn filter(&self, elem: &JS<Element>, _root: &JS<Node>) -> bool {
-                elem.get().local_name == self.tag
+            fn filter(&self, elem: &JSRef<Element>, _root: &JSRef<Node>) -> bool {
+                elem.deref().local_name == self.tag
             }
         }
         let filter = TagNameFilter {
@@ -73,15 +73,15 @@ impl HTMLCollection {
         HTMLCollection::create(window, root, ~filter)
     }
 
-    pub fn by_tag_name_ns(window: &JS<Window>, root: &JS<Node>, tag: DOMString,
-                          namespace: Namespace) -> JS<HTMLCollection> {
+    pub fn by_tag_name_ns(window: &JSRef<Window>, root: &JSRef<Node>, tag: DOMString,
+                          namespace: Namespace) -> Temporary<HTMLCollection> {
         struct TagNameNSFilter {
             tag: DOMString,
             namespace: Namespace
         }
         impl CollectionFilter for TagNameNSFilter {
-            fn filter(&self, elem: &JS<Element>, _root: &JS<Node>) -> bool {
-                elem.get().namespace == self.namespace && elem.get().local_name == self.tag
+            fn filter(&self, elem: &JSRef<Element>, _root: &JSRef<Node>) -> bool {
+                elem.deref().namespace == self.namespace && elem.deref().local_name == self.tag
             }
         }
         let filter = TagNameNSFilter {
@@ -91,13 +91,13 @@ impl HTMLCollection {
         HTMLCollection::create(window, root, ~filter)
     }
 
-    pub fn by_class_name(window: &JS<Window>, root: &JS<Node>, classes: DOMString)
-                         -> JS<HTMLCollection> {
+    pub fn by_class_name(window: &JSRef<Window>, root: &JSRef<Node>, classes: DOMString)
+                         -> Temporary<HTMLCollection> {
         struct ClassNameFilter {
             classes: Vec<DOMString>
         }
         impl CollectionFilter for ClassNameFilter {
-            fn filter(&self, elem: &JS<Element>, _root: &JS<Node>) -> bool {
+            fn filter(&self, elem: &JSRef<Element>, _root: &JSRef<Node>) -> bool {
                 self.classes.iter().all(|class| elem.has_class(*class))
             }
         }
@@ -107,46 +107,65 @@ impl HTMLCollection {
         HTMLCollection::create(window, root, ~filter)
     }
 
-    pub fn children(window: &JS<Window>, root: &JS<Node>) -> JS<HTMLCollection> {
+    pub fn children(window: &JSRef<Window>, root: &JSRef<Node>) -> Temporary<HTMLCollection> {
         struct ElementChildFilter;
         impl CollectionFilter for ElementChildFilter {
-            fn filter(&self, elem: &JS<Element>, root: &JS<Node>) -> bool {
-                root.is_parent_of(&NodeCast::from(elem))
+            fn filter(&self, elem: &JSRef<Element>, root: &JSRef<Node>) -> bool {
+                root.is_parent_of(NodeCast::from_ref(elem))
             }
         }
         HTMLCollection::create(window, root, ~ElementChildFilter)
     }
 }
 
-impl HTMLCollection {
+pub trait HTMLCollectionMethods {
+    fn Length(&self) -> u32;
+    fn Item(&self, index: u32) -> Option<Temporary<Element>>;
+    fn NamedItem(&self, key: DOMString) -> Option<Temporary<Element>>;
+    fn IndexedGetter(&self, index: u32, found: &mut bool) -> Option<Temporary<Element>>;
+    fn NamedGetter(&self, maybe_name: Option<DOMString>, found: &mut bool) -> Option<Temporary<Element>>;
+}
+
+impl<'a> HTMLCollectionMethods for JSRef<'a, HTMLCollection> {
     // http://dom.spec.whatwg.org/#dom-htmlcollection-length
-    pub fn Length(&self) -> u32 {
+    fn Length(&self) -> u32 {
         match self.collection {
             Static(ref elems) => elems.len() as u32,
-            Live(ref root, ref filter) => root.traverse_preorder()
-                .count(|child| {
-                    let elem: Option<JS<Element>> = ElementCast::to(&child);
-                    elem.map_or(false, |elem| filter.filter(&elem, root))
-                }) as u32
+            Live(ref root, ref filter) => {
+                let root = root.root();
+                root.deref().traverse_preorder()
+                    .count(|child| {
+                        let elem: Option<&JSRef<Element>> = ElementCast::to_ref(&child);
+                        elem.map_or(false, |elem| filter.filter(elem, &*root))
+                    }) as u32
+            }
         }
     }
 
     // http://dom.spec.whatwg.org/#dom-htmlcollection-item
-    pub fn Item(&self, index: u32) -> Option<JS<Element>> {
+    fn Item(&self, index: u32) -> Option<Temporary<Element>> {
         match self.collection {
             Static(ref elems) => elems
                 .as_slice()
                 .get(index as uint)
-                .map(|elem| elem.clone()),
-            Live(ref root, ref filter) => root.traverse_preorder()
-                .filter_map(|node| ElementCast::to(&node))
-                .filter(|elem| filter.filter(elem, root))
-                .nth(index as uint).clone()
+                .map(|elem| Temporary::new(elem.clone())),
+            Live(ref root, ref filter) => {
+                let root = root.root();
+                root.deref().traverse_preorder()
+                    .filter_map(|node| {
+                        let elem: Option<&JSRef<Element>> = ElementCast::to_ref(&node);
+                        elem.filtered(|&elem| filter.filter(elem, &*root))
+                            .map(|elem| elem.clone())
+                    })
+                    .nth(index as uint)
+                    .clone()
+                    .map(|elem| Temporary::from_rooted(&elem))
+            }
         }
     }
 
     // http://dom.spec.whatwg.org/#dom-htmlcollection-nameditem
-    pub fn NamedItem(&self, key: DOMString) -> Option<JS<Element>> {
+    fn NamedItem(&self, key: DOMString) -> Option<Temporary<Element>> {
         // Step 1.
         if key.is_empty() {
             return None;
@@ -155,29 +174,34 @@ impl HTMLCollection {
         // Step 2.
         match self.collection {
             Static(ref elems) => elems.iter()
+                .map(|elem| elem.root())
                 .find(|elem| {
                     elem.get_string_attribute("name") == key ||
                     elem.get_string_attribute("id") == key })
-                .map(|maybe_elem| maybe_elem.clone()),
-            Live(ref root, ref filter) => root.traverse_preorder()
-                .filter_map(|node| ElementCast::to(&node))
-                .filter(|elem| filter.filter(elem, root))
-                .find(|elem| {
-                    elem.get_string_attribute("name") == key ||
-                    elem.get_string_attribute("id") == key })
-                .map(|maybe_elem| maybe_elem.clone())
+                .map(|maybe_elem| Temporary::from_rooted(&*maybe_elem)),
+            Live(ref root, ref filter) => {
+                let root = root.root();
+                root.deref().traverse_preorder()
+                    .filter_map(|node| {
+                        let elem: Option<&JSRef<Element>> = ElementCast::to_ref(&node);
+                        elem.filtered(|&elem| filter.filter(elem, &*root))
+                            .map(|elem| elem.clone())
+                    })
+                    .find(|elem| {
+                        elem.get_string_attribute("name") == key ||
+                        elem.get_string_attribute("id") == key })
+                    .map(|maybe_elem| Temporary::from_rooted(&maybe_elem))
+            }
         }
     }
-}
 
-impl HTMLCollection {
-    pub fn IndexedGetter(&self, index: u32, found: &mut bool) -> Option<JS<Element>> {
+    fn IndexedGetter(&self, index: u32, found: &mut bool) -> Option<Temporary<Element>> {
         let maybe_elem = self.Item(index);
         *found = maybe_elem.is_some();
         maybe_elem
     }
 
-    pub fn NamedGetter(&self, maybe_name: Option<DOMString>, found: &mut bool) -> Option<JS<Element>> {
+    fn NamedGetter(&self, maybe_name: Option<DOMString>, found: &mut bool) -> Option<Temporary<Element>> {
         match maybe_name {
             Some(name) => {
                 let maybe_elem = self.NamedItem(name);

src/components/script/dom/htmldataelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLDataElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLDataElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLDataElementTypeId;
@@ -28,24 +28,29 @@ impl HTMLDataElementDerived for EventTarget {
 }
 
 impl HTMLDataElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLDataElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLDataElement {
         HTMLDataElement {
             htmlelement: HTMLElement::new_inherited(HTMLDataElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLDataElement> {
-        let element = HTMLDataElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLDataElement> {
+        let element = HTMLDataElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLDataElementBinding::Wrap)
     }
 }
 
-impl HTMLDataElement {
-    pub fn Value(&self) -> DOMString {
+pub trait HTMLDataElementMethods {
+    fn Value(&self) -> DOMString;
+    fn SetValue(&mut self, _value: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLDataElementMethods for JSRef<'a, HTMLDataElement> {
+    fn Value(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetValue(&mut self, _value: DOMString) -> ErrorResult {
+    fn SetValue(&mut self, _value: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmldatalistelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLDataListElementBinding;
 use dom::bindings::codegen::InheritTypes::{HTMLDataListElementDerived, NodeCast};
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::element::{Element, HTMLDataListElementTypeId};
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
@@ -28,28 +28,33 @@ impl HTMLDataListElementDerived for EventTarget {
 }
 
 impl HTMLDataListElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLDataListElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLDataListElement {
         HTMLDataListElement {
             htmlelement: HTMLElement::new_inherited(HTMLDataListElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLDataListElement> {
-        let element = HTMLDataListElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLDataListElement> {
+        let element = HTMLDataListElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLDataListElementBinding::Wrap)
     }
 }
 
-impl HTMLDataListElement {
-    pub fn Options(&self, abstract_self: &JS<HTMLDataListElement>) -> JS<HTMLCollection> {
+pub trait HTMLDataListElementMethods {
+    fn Options(&self) -> Temporary<HTMLCollection>;
+}
+
+impl<'a> HTMLDataListElementMethods for JSRef<'a, HTMLDataListElement> {
+    fn Options(&self) -> Temporary<HTMLCollection> {
         struct HTMLDataListOptionsFilter;
         impl CollectionFilter for HTMLDataListOptionsFilter {
-            fn filter(&self, elem: &JS<Element>, _root: &JS<Node>) -> bool {
-                elem.get().local_name == ~"option"
+            fn filter(&self, elem: &JSRef<Element>, _root: &JSRef<Node>) -> bool {
+                elem.deref().local_name == ~"option"
             }
         }
-        let node: JS<Node> = NodeCast::from(abstract_self);
+        let node: &JSRef<Node> = NodeCast::from_ref(self);
         let filter = ~HTMLDataListOptionsFilter;
-        HTMLCollection::create(&window_from_node(&node), &node, filter)
+        let window = window_from_node(node).root();
+        HTMLCollection::create(&*window, node, filter)
     }
 }

src/components/script/dom/htmldirectoryelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLDirectoryElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLDirectoryElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLDirectoryElementTypeId;
@@ -28,24 +28,29 @@ impl HTMLDirectoryElementDerived for EventTarget {
 }
 
 impl HTMLDirectoryElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLDirectoryElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLDirectoryElement {
         HTMLDirectoryElement {
             htmlelement: HTMLElement::new_inherited(HTMLDirectoryElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLDirectoryElement> {
-        let element = HTMLDirectoryElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLDirectoryElement> {
+        let element = HTMLDirectoryElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLDirectoryElementBinding::Wrap)
     }
 }
 
-impl HTMLDirectoryElement {
-    pub fn Compact(&self) -> bool {
+pub trait HTMLDirectoryElementMethods {
+    fn Compact(&self) -> bool;
+    fn SetCompact(&mut self, _compact: bool) -> ErrorResult;
+}
+
+impl<'a> HTMLDirectoryElementMethods for JSRef<'a, HTMLDirectoryElement> {
+    fn Compact(&self) -> bool {
         false
     }
 
-    pub fn SetCompact(&mut self, _compact: bool) -> ErrorResult {
+    fn SetCompact(&mut self, _compact: bool) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmldivelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLDivElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLDivElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLDivElementTypeId;
@@ -28,24 +28,29 @@ impl HTMLDivElementDerived for EventTarget {
 }
 
 impl HTMLDivElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLDivElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLDivElement {
         HTMLDivElement {
             htmlelement: HTMLElement::new_inherited(HTMLDivElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLDivElement> {
-        let element = HTMLDivElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLDivElement> {
+        let element = HTMLDivElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLDivElementBinding::Wrap)
     }
 }
 
-impl HTMLDivElement {
-    pub fn Align(&self) -> DOMString {
+pub trait HTMLDivElementMethods {
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLDivElementMethods for JSRef<'a, HTMLDivElement> {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmldlistelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLDListElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLDListElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLDListElementTypeId;
@@ -28,32 +28,40 @@ impl HTMLDListElementDerived for EventTarget {
 }
 
 impl HTMLDListElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLDListElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLDListElement {
         HTMLDListElement {
             htmlelement: HTMLElement::new_inherited(HTMLDListElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLDListElement> {
-        let element = HTMLDListElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLDListElement> {
+        let element = HTMLDListElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLDListElementBinding::Wrap)
     }
 }
 
-impl HTMLDListElement {
-    pub fn Compact(&self) -> bool {
+pub trait HTMLDListElementMethods {
+    fn Compact(&self) -> bool;
+    fn SetCompact(&mut self, _compact: bool) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLDListElementMethods for JSRef<'a, HTMLDListElement> {
+    fn Compact(&self) -> bool {
         false
     }
 
-    pub fn SetCompact(&mut self, _compact: bool) -> ErrorResult {
+    fn SetCompact(&mut self, _compact: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetType(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 }
+

src/components/script/dom/htmlelement.rs

@@ -5,7 +5,7 @@
 use dom::bindings::codegen::BindingDeclarations::HTMLElementBinding;
 use dom::bindings::codegen::InheritTypes::ElementCast;
 use dom::bindings::codegen::InheritTypes::HTMLElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::{ErrorResult, Fallible};
 use dom::document::Document;
 use dom::element::{Element, ElementTypeId, HTMLElementTypeId};
@@ -33,140 +33,173 @@ impl HTMLElementDerived for EventTarget {
 }
 
 impl HTMLElement {
-    pub fn new_inherited(type_id: ElementTypeId, tag_name: DOMString, document: JS<Document>) -> HTMLElement {
+    pub fn new_inherited(type_id: ElementTypeId, tag_name: DOMString, document: &JSRef<Document>) -> HTMLElement {
         HTMLElement {
             element: Element::new_inherited(type_id, tag_name, namespace::HTML, None, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLElement> {
-        let element = HTMLElement::new_inherited(HTMLElementTypeId, localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLElement> {
+        let element = HTMLElement::new_inherited(HTMLElementTypeId, localName, document);
         Node::reflect_node(~element, document, HTMLElementBinding::Wrap)
     }
 }
 
-impl HTMLElement {
-    pub fn Title(&self) -> DOMString {
+pub trait HTMLElementMethods {
+    fn Title(&self) -> DOMString;
+    fn SetTitle(&mut self, _title: DOMString);
+    fn Lang(&self) -> DOMString;
+    fn SetLang(&mut self, _lang: DOMString);
+    fn Dir(&self) -> DOMString;
+    fn SetDir(&mut self, _dir: DOMString) -> ErrorResult;
+    fn GetItemValue(&self, _cx: *JSContext) -> Fallible<JSVal>;
+    fn SetItemValue(&mut self, _cx: *JSContext, _val: JSVal) -> ErrorResult;
+    fn Hidden(&self) -> bool;
+    fn SetHidden(&mut self, _hidden: bool) -> ErrorResult;
+    fn Click(&self);
+    fn TabIndex(&self) -> i32;
+    fn SetTabIndex(&mut self, _index: i32) -> ErrorResult;
+    fn Focus(&self) -> ErrorResult;
+    fn Blur(&self) -> ErrorResult;
+    fn AccessKey(&self) -> DOMString;
+    fn SetAccessKey(&self, _key: DOMString) -> ErrorResult;
+    fn AccessKeyLabel(&self) -> DOMString;
+    fn Draggable(&self) -> bool;
+    fn SetDraggable(&mut self, _draggable: bool) -> ErrorResult;
+    fn ContentEditable(&self) -> DOMString;
+    fn SetContentEditable(&mut self, _val: DOMString) -> ErrorResult;
+    fn IsContentEditable(&self) -> bool;
+    fn Spellcheck(&self) -> bool;
+    fn SetSpellcheck(&self, _val: bool) -> ErrorResult;
+    fn GetOffsetParent(&self) -> Option<Temporary<Element>>;
+    fn OffsetTop(&self) -> i32;
+    fn OffsetLeft(&self) -> i32;
+    fn OffsetWidth(&self) -> i32;
+    fn OffsetHeight(&self) -> i32;
+}
+
+impl<'a> HTMLElementMethods for JSRef<'a, HTMLElement> {
+    fn Title(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetTitle(&mut self, _title: DOMString) {
+    fn SetTitle(&mut self, _title: DOMString) {
     }
 
-    pub fn Lang(&self) -> DOMString {
+    fn Lang(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetLang(&mut self, _lang: DOMString) {
+    fn SetLang(&mut self, _lang: DOMString) {
     }
 
-    pub fn Dir(&self) -> DOMString {
+    fn Dir(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetDir(&mut self, _dir: DOMString) -> ErrorResult {
+    fn SetDir(&mut self, _dir: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetItemValue(&self, _cx: *JSContext) -> Fallible<JSVal> {
+    fn GetItemValue(&self, _cx: *JSContext) -> Fallible<JSVal> {
         Ok(NullValue())
     }
 
-    pub fn SetItemValue(&mut self, _cx: *JSContext, _val: JSVal) -> ErrorResult {
+    fn SetItemValue(&mut self, _cx: *JSContext, _val: JSVal) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Hidden(&self) -> bool {
+    fn Hidden(&self) -> bool {
         false
     }
 
-    pub fn SetHidden(&mut self, _hidden: bool) -> ErrorResult {
+    fn SetHidden(&mut self, _hidden: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Click(&self) {
+    fn Click(&self) {
     }
 
-    pub fn TabIndex(&self) -> i32 {
+    fn TabIndex(&self) -> i32 {
         0
     }
 
-    pub fn SetTabIndex(&mut self, _index: i32) -> ErrorResult {
+    fn SetTabIndex(&mut self, _index: i32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Focus(&self) -> ErrorResult {
+    fn Focus(&self) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Blur(&self) -> ErrorResult {
+    fn Blur(&self) -> ErrorResult {
         Ok(())
     }
 
-    pub fn AccessKey(&self) -> DOMString {
+    fn AccessKey(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAccessKey(&self, _key: DOMString) -> ErrorResult {
+    fn SetAccessKey(&self, _key: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn AccessKeyLabel(&self) -> DOMString {
+    fn AccessKeyLabel(&self) -> DOMString {
         ~""
     }
 
-    pub fn Draggable(&self) -> bool {
+    fn Draggable(&self) -> bool {
         false
     }
 
-    pub fn SetDraggable(&mut self, _draggable: bool) -> ErrorResult {
+    fn SetDraggable(&mut self, _draggable: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn ContentEditable(&self) -> DOMString {
+    fn ContentEditable(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetContentEditable(&mut self, _val: DOMString) -> ErrorResult {
+    fn SetContentEditable(&mut self, _val: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn IsContentEditable(&self) -> bool {
+    fn IsContentEditable(&self) -> bool {
         false
     }
 
-    pub fn Spellcheck(&self) -> bool {
+    fn Spellcheck(&self) -> bool {
         false
     }
 
-    pub fn SetSpellcheck(&self, _val: bool) -> ErrorResult {
+    fn SetSpellcheck(&self, _val: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetOffsetParent(&self) -> Option<JS<Element>> {
+    fn GetOffsetParent(&self) -> Option<Temporary<Element>> {
         None
     }
 
-    pub fn OffsetTop(&self) -> i32 {
+    fn OffsetTop(&self) -> i32 {
         0
     }
 
-    pub fn OffsetLeft(&self) -> i32 {
+    fn OffsetLeft(&self) -> i32 {
         0
     }
 
-    pub fn OffsetWidth(&self) -> i32 {
+    fn OffsetWidth(&self) -> i32 {
         0
     }
 
-    pub fn OffsetHeight(&self) -> i32 {
+    fn OffsetHeight(&self) -> i32 {
         0
     }
 }
 
-impl VirtualMethods for JS<HTMLElement> {
-    fn super_type(&self) -> Option<~VirtualMethods:> {
-        let element: JS<Element> = ElementCast::from(self);
-        Some(~element as ~VirtualMethods:)
+impl<'a> VirtualMethods for JSRef<'a, HTMLElement> {
+    fn super_type<'a>(&'a mut self) -> Option<&'a mut VirtualMethods:> {
+        let element: &mut JSRef<Element> = ElementCast::from_mut_ref(self);
+        Some(element as &mut VirtualMethods:)
     }
 }

src/components/script/dom/htmlembedelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLEmbedElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLEmbedElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLEmbedElementTypeId;
@@ -28,68 +28,84 @@ impl HTMLEmbedElementDerived for EventTarget {
 }
 
 impl HTMLEmbedElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLEmbedElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLEmbedElement {
         HTMLEmbedElement {
             htmlelement: HTMLElement::new_inherited(HTMLEmbedElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLEmbedElement> {
-        let element = HTMLEmbedElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLEmbedElement> {
+        let element = HTMLEmbedElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLEmbedElementBinding::Wrap)
     }
 }
 
-impl HTMLEmbedElement {
-    pub fn Src(&self) -> DOMString {
+pub trait HTMLEmbedElementMethods {
+    fn Src(&self) -> DOMString;
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult;
+    fn Width(&self) -> DOMString;
+    fn SetWidth(&mut self, _width: DOMString) -> ErrorResult;
+    fn Height(&self) -> DOMString;
+    fn SetHeight(&mut self, _height: DOMString) -> ErrorResult;
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&mut self, _type: DOMString) -> ErrorResult;
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _type: DOMString) -> ErrorResult;
+    fn GetSVGDocument(&self) -> Option<Temporary<Document>>;
+}
+
+impl<'a> HTMLEmbedElementMethods for JSRef<'a, HTMLEmbedElement> {
+    fn Src(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetSrc(&mut self, _src: DOMString) -> ErrorResult {
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetType(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Width(&self) -> DOMString {
+    fn Width(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetWidth(&mut self, _width: DOMString) -> ErrorResult {
+    fn SetWidth(&mut self, _width: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Height(&self) -> DOMString {
+    fn Height(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetHeight(&mut self, _height: DOMString) -> ErrorResult {
+    fn SetHeight(&mut self, _height: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Align(&self) -> DOMString {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetAlign(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Name(&self) -> DOMString {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetSVGDocument(&self) -> Option<JS<Document>> {
+    fn GetSVGDocument(&self) -> Option<Temporary<Document>> {
         None
     }
 }

src/components/script/dom/htmlfieldsetelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLFieldSetElementBinding;
 use dom::bindings::codegen::InheritTypes::{ElementCast, HTMLFieldSetElementDerived, NodeCast};
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::{Element, HTMLFieldSetElementTypeId};
@@ -31,77 +31,92 @@ impl HTMLFieldSetElementDerived for EventTarget {
 }
 
 impl HTMLFieldSetElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLFieldSetElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLFieldSetElement {
         HTMLFieldSetElement {
             htmlelement: HTMLElement::new_inherited(HTMLFieldSetElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLFieldSetElement> {
-        let element = HTMLFieldSetElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLFieldSetElement> {
+        let element = HTMLFieldSetElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLFieldSetElementBinding::Wrap)
     }
 }
 
-impl HTMLFieldSetElement {
-    pub fn Disabled(&self) -> bool {
+pub trait HTMLFieldSetElementMethods {
+    fn Disabled(&self) -> bool;
+    fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult;
+    fn GetForm(&self) -> Option<Temporary<HTMLFormElement>>;
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn Elements(&self) -> Temporary<HTMLCollection>;
+    fn WillValidate(&self) -> bool;
+    fn Validity(&self) -> Temporary<ValidityState>;
+    fn ValidationMessage(&self) -> DOMString;
+    fn CheckValidity(&self) -> bool;
+    fn SetCustomValidity(&mut self, _error: DOMString);
+}
+
+impl<'a> HTMLFieldSetElementMethods for JSRef<'a, HTMLFieldSetElement> {
+    fn Disabled(&self) -> bool {
         false
     }
 
-    pub fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult {
+    fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetForm(&self) -> Option<JS<HTMLFormElement>> {
+    fn GetForm(&self) -> Option<Temporary<HTMLFormElement>> {
         None
     }
 
-    pub fn Name(&self) -> DOMString {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _name: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
     // http://www.whatwg.org/html/#dom-fieldset-elements
-    pub fn Elements(&self, abstract_self: &JS<HTMLFieldSetElement>) -> JS<HTMLCollection> {
+    fn Elements(&self) -> Temporary<HTMLCollection> {
         struct ElementsFilter;
         impl CollectionFilter for ElementsFilter {
-            fn filter(&self, elem: &JS<Element>, root: &JS<Node>) -> bool {
+            fn filter(&self, elem: &JSRef<Element>, root: &JSRef<Node>) -> bool {
                 static tag_names: StaticStringVec = &["button", "fieldset", "input",
                     "keygen", "object", "output", "select", "textarea"];
-                let root: &JS<Element> = &ElementCast::to(root).unwrap();
-                elem != root && tag_names.iter().any(|&tag_name| tag_name == elem.get().local_name)
+                let root: &JSRef<Element> = ElementCast::to_ref(root).unwrap();
+                elem != root && tag_names.iter().any(|&tag_name| tag_name == elem.deref().local_name)
             }
         }
-        let node: JS<Node> = NodeCast::from(abstract_self);
+        let node: &JSRef<Node> = NodeCast::from_ref(self);
         let filter = ~ElementsFilter;
-        HTMLCollection::create(&window_from_node(&node), &node, filter)
+        let window = window_from_node(node).root();
+        HTMLCollection::create(&*window, node, filter)
     }
 
-    pub fn WillValidate(&self) -> bool {
+    fn WillValidate(&self) -> bool {
         false
     }
 
-    pub fn Validity(&self) -> JS<ValidityState> {
-        let doc = self.htmlelement.element.node.owner_doc();
-        let doc = doc.get();
-        ValidityState::new(&doc.window)
+    fn Validity(&self) -> Temporary<ValidityState> {
+        let window = window_from_node(self).root();
+        ValidityState::new(&*window)
     }
 
-    pub fn ValidationMessage(&self) -> DOMString {
+    fn ValidationMessage(&self) -> DOMString {
         ~""
     }
 
-    pub fn CheckValidity(&self) -> bool {
+    fn CheckValidity(&self) -> bool {
         false
     }
 
-    pub fn SetCustomValidity(&mut self, _error: DOMString) {
+    fn SetCustomValidity(&mut self, _error: DOMString) {
     }
 }

src/components/script/dom/htmlfontelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLFontElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLFontElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLFontElementTypeId;
@@ -28,40 +28,49 @@ impl HTMLFontElementDerived for EventTarget {
 }
 
 impl HTMLFontElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLFontElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLFontElement {
         HTMLFontElement {
             htmlelement: HTMLElement::new_inherited(HTMLFontElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLFontElement> {
-        let element = HTMLFontElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLFontElement> {
+        let element = HTMLFontElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLFontElementBinding::Wrap)
     }
 }
 
-impl HTMLFontElement {
-    pub fn Color(&self) -> DOMString {
+pub trait HTMLFontElementMethods {
+    fn Color(&self) -> DOMString;
+    fn SetColor(&mut self, _color: DOMString) -> ErrorResult;
+    fn Face(&self) -> DOMString;
+    fn SetFace(&mut self, _face: DOMString) -> ErrorResult;
+    fn Size(&self) -> DOMString;
+    fn SetSize(&mut self, _size: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLFontElementMethods for JSRef<'a, HTMLFontElement> {
+    fn Color(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetColor(&mut self, _color: DOMString) -> ErrorResult {
+    fn SetColor(&mut self, _color: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Face(&self) -> DOMString {
+    fn Face(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetFace(&mut self, _face: DOMString) -> ErrorResult {
+    fn SetFace(&mut self, _face: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Size(&self) -> DOMString {
+    fn Size(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetSize(&mut self, _size: DOMString) -> ErrorResult {
+    fn SetSize(&mut self, _size: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlformelement.rs

@@ -4,14 +4,14 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLFormElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLFormElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::{Element, HTMLFormElementTypeId};
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
 use dom::htmlcollection::{HTMLCollection, Static};
 use dom::htmlelement::HTMLElement;
-use dom::node::{Node, ElementNodeTypeId};
+use dom::node::{Node, ElementNodeTypeId, window_from_node};
 use servo_util::str::DOMString;
 
 #[deriving(Encodable)]
@@ -29,114 +29,140 @@ impl HTMLFormElementDerived for EventTarget {
 }
 
 impl HTMLFormElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLFormElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLFormElement {
         HTMLFormElement {
             htmlelement: HTMLElement::new_inherited(HTMLFormElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLFormElement> {
-        let element = HTMLFormElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLFormElement> {
+        let element = HTMLFormElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLFormElementBinding::Wrap)
     }
 }
 
-impl HTMLFormElement {
-    pub fn AcceptCharset(&self) -> DOMString {
+pub trait HTMLFormElementMethods {
+    fn AcceptCharset(&self) -> DOMString;
+    fn SetAcceptCharset(&mut self, _accept_charset: DOMString) -> ErrorResult;
+    fn Action(&self) -> DOMString;
+    fn SetAction(&mut self, _action: DOMString) -> ErrorResult;
+    fn Autocomplete(&self) -> DOMString;
+    fn SetAutocomplete(&mut self, _autocomplete: DOMString) -> ErrorResult;
+    fn Enctype(&self) -> DOMString;
+    fn SetEnctype(&mut self, _enctype: DOMString) -> ErrorResult;
+    fn Encoding(&self) -> DOMString;
+    fn SetEncoding(&mut self, _encoding: DOMString) -> ErrorResult;
+    fn Method(&self) -> DOMString;
+    fn SetMethod(&mut self, _method: DOMString) -> ErrorResult;
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult;
+    fn NoValidate(&self) -> bool;
+    fn SetNoValidate(&mut self, _no_validate: bool) -> ErrorResult;
+    fn Target(&self) -> DOMString;
+    fn SetTarget(&mut self, _target: DOMString) -> ErrorResult;
+    fn Elements(&self) -> Temporary<HTMLCollection>;
+    fn Length(&self) -> i32;
+    fn Submit(&self) -> ErrorResult;
+    fn Reset(&self);
+    fn CheckValidity(&self) -> bool;
+    fn IndexedGetter(&self, _index: u32, _found: &mut bool) -> Temporary<Element>;
+}
+
+impl<'a> HTMLFormElementMethods for JSRef<'a, HTMLFormElement> {
+    fn AcceptCharset(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAcceptCharset(&mut self, _accept_charset: DOMString) -> ErrorResult {
+    fn SetAcceptCharset(&mut self, _accept_charset: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Action(&self) -> DOMString {
+    fn Action(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAction(&mut self, _action: DOMString) -> ErrorResult {
+    fn SetAction(&mut self, _action: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Autocomplete(&self) -> DOMString {
+    fn Autocomplete(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAutocomplete(&mut self, _autocomplete: DOMString) -> ErrorResult {
+    fn SetAutocomplete(&mut self, _autocomplete: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Enctype(&self) -> DOMString {
+    fn Enctype(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetEnctype(&mut self, _enctype: DOMString) -> ErrorResult {
+    fn SetEnctype(&mut self, _enctype: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Encoding(&self) -> DOMString {
+    fn Encoding(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetEncoding(&mut self, _encoding: DOMString) -> ErrorResult {
+    fn SetEncoding(&mut self, _encoding: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Method(&self) -> DOMString {
+    fn Method(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetMethod(&mut self, _method: DOMString) -> ErrorResult {
+    fn SetMethod(&mut self, _method: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Name(&self) -> DOMString {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _name: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn NoValidate(&self) -> bool {
+    fn NoValidate(&self) -> bool {
         false
     }
 
-    pub fn SetNoValidate(&mut self, _no_validate: bool) -> ErrorResult {
+    fn SetNoValidate(&mut self, _no_validate: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Target(&self) -> DOMString {
+    fn Target(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetTarget(&mut self, _target: DOMString) -> ErrorResult {
+    fn SetTarget(&mut self, _target: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Elements(&self) -> JS<HTMLCollection> {
+    fn Elements(&self) -> Temporary<HTMLCollection> {
         // FIXME: https://github.com/mozilla/servo/issues/1844
-        let doc = self.htmlelement.element.node.owner_doc();
-        let doc = doc.get();
-        HTMLCollection::new(&doc.window, Static(vec!()))
+        let window = window_from_node(self).root();
+        HTMLCollection::new(&*window, Static(vec!()))
     }
 
-    pub fn Length(&self) -> i32 {
+    fn Length(&self) -> i32 {
         0
     }
 
-    pub fn Submit(&self) -> ErrorResult {
+    fn Submit(&self) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Reset(&self) {
+    fn Reset(&self) {
     }
 
-    pub fn CheckValidity(&self) -> bool {
+    fn CheckValidity(&self) -> bool {
         false
     }
 
-    pub fn IndexedGetter(&self, _index: u32, _found: &mut bool) -> JS<Element> {
+    fn IndexedGetter(&self, _index: u32, _found: &mut bool) -> Temporary<Element> {
         fail!("Not implemented.")
     }
 }

src/components/script/dom/htmlframeelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLFrameElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLFrameElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLFrameElementTypeId;
@@ -29,88 +29,109 @@ impl HTMLFrameElementDerived for EventTarget {
 }
 
 impl HTMLFrameElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLFrameElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLFrameElement {
         HTMLFrameElement {
             htmlelement: HTMLElement::new_inherited(HTMLFrameElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLFrameElement> {
-        let element = HTMLFrameElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLFrameElement> {
+        let element = HTMLFrameElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLFrameElementBinding::Wrap)
     }
 }
 
-impl HTMLFrameElement {
-    pub fn Name(&self) -> DOMString {
+pub trait HTMLFrameElementMethods {
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult;
+    fn Scrolling(&self) -> DOMString;
+    fn SetScrolling(&mut self, _scrolling: DOMString) -> ErrorResult;
+    fn Src(&self) -> DOMString;
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult;
+    fn FrameBorder(&self) -> DOMString;
+    fn SetFrameBorder(&mut self, _frameborder: DOMString) -> ErrorResult;
+    fn LongDesc(&self) -> DOMString;
+    fn SetLongDesc(&mut self, _longdesc: DOMString) -> ErrorResult;
+    fn NoResize(&self) -> bool;
+    fn SetNoResize(&mut self, _no_resize: bool) -> ErrorResult;
+    fn GetContentDocument(&self) -> Option<Temporary<Document>>;
+    fn GetContentWindow(&self) -> Option<Temporary<Window>>;
+    fn MarginHeight(&self) -> DOMString;
+    fn SetMarginHeight(&mut self, _height: DOMString) -> ErrorResult;
+    fn MarginWidth(&self) -> DOMString;
+    fn SetMarginWidth(&mut self, _height: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLFrameElementMethods for JSRef<'a, HTMLFrameElement> {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _name: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Scrolling(&self) -> DOMString {
+    fn Scrolling(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetScrolling(&mut self, _scrolling: DOMString) -> ErrorResult {
+    fn SetScrolling(&mut self, _scrolling: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Src(&self) -> DOMString {
+    fn Src(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetSrc(&mut self, _src: DOMString) -> ErrorResult {
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn FrameBorder(&self) -> DOMString {
+    fn FrameBorder(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetFrameBorder(&mut self, _frameborder: DOMString) -> ErrorResult {
+    fn SetFrameBorder(&mut self, _frameborder: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn LongDesc(&self) -> DOMString {
+    fn LongDesc(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetLongDesc(&mut self, _longdesc: DOMString) -> ErrorResult {
+    fn SetLongDesc(&mut self, _longdesc: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn NoResize(&self) -> bool {
+    fn NoResize(&self) -> bool {
         false
     }
 
-    pub fn SetNoResize(&mut self, _no_resize: bool) -> ErrorResult {
+    fn SetNoResize(&mut self, _no_resize: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetContentDocument(&self) -> Option<JS<Document>> {
+    fn GetContentDocument(&self) -> Option<Temporary<Document>> {
         None
     }
 
-    pub fn GetContentWindow(&self) -> Option<JS<Window>> {
+    fn GetContentWindow(&self) -> Option<Temporary<Window>> {
         None
     }
 
-    pub fn MarginHeight(&self) -> DOMString {
+    fn MarginHeight(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetMarginHeight(&mut self, _height: DOMString) -> ErrorResult {
+    fn SetMarginHeight(&mut self, _height: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn MarginWidth(&self) -> DOMString {
+    fn MarginWidth(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetMarginWidth(&mut self, _height: DOMString) -> ErrorResult {
+    fn SetMarginWidth(&mut self, _height: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlframesetelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLFrameSetElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLFrameSetElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLFrameSetElementTypeId;
@@ -28,32 +28,39 @@ impl HTMLFrameSetElementDerived for EventTarget {
 }
 
 impl HTMLFrameSetElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLFrameSetElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLFrameSetElement {
         HTMLFrameSetElement {
             htmlelement: HTMLElement::new_inherited(HTMLFrameSetElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLFrameSetElement> {
-        let element = HTMLFrameSetElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLFrameSetElement> {
+        let element = HTMLFrameSetElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLFrameSetElementBinding::Wrap)
     }
 }
 
-impl HTMLFrameSetElement {
-    pub fn Cols(&self) -> DOMString {
+pub trait HTMLFrameSetElementMethods {
+    fn Cols(&self) -> DOMString;
+    fn SetCols(&mut self, _cols: DOMString) -> ErrorResult;
+    fn Rows(&self) -> DOMString;
+    fn SetRows(&mut self, _rows: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLFrameSetElementMethods for JSRef<'a, HTMLFrameSetElement> {
+    fn Cols(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCols(&mut self, _cols: DOMString) -> ErrorResult {
+    fn SetCols(&mut self, _cols: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Rows(&self) -> DOMString {
+    fn Rows(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetRows(&mut self, _rows: DOMString) -> ErrorResult {
+    fn SetRows(&mut self, _rows: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlheadelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLHeadElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLHeadElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::element::HTMLHeadElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
@@ -27,14 +27,17 @@ impl HTMLHeadElementDerived for EventTarget {
 }
 
 impl HTMLHeadElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLHeadElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLHeadElement {
         HTMLHeadElement {
             htmlelement: HTMLElement::new_inherited(HTMLHeadElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLHeadElement> {
-        let element = HTMLHeadElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLHeadElement> {
+        let element = HTMLHeadElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLHeadElementBinding::Wrap)
     }
 }
+
+pub trait HTMLHeadElementMethods {
+}

src/components/script/dom/htmlheadingelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLHeadingElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLHeadingElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::element::HTMLHeadingElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
@@ -38,24 +38,29 @@ impl HTMLHeadingElementDerived for EventTarget {
 }
 
 impl HTMLHeadingElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>, level: HeadingLevel) -> HTMLHeadingElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>, level: HeadingLevel) -> HTMLHeadingElement {
         HTMLHeadingElement {
             htmlelement: HTMLElement::new_inherited(HTMLHeadingElementTypeId, localName, document),
             level: level,
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>, level: HeadingLevel) -> JS<HTMLHeadingElement> {
-        let element = HTMLHeadingElement::new_inherited(localName, document.clone(), level);
+    pub fn new(localName: DOMString, document: &JSRef<Document>, level: HeadingLevel) -> Temporary<HTMLHeadingElement> {
+        let element = HTMLHeadingElement::new_inherited(localName, document, level);
         Node::reflect_node(~element, document, HTMLHeadingElementBinding::Wrap)
     }
 }
 
-impl HTMLHeadingElement {
-    pub fn Align(&self) -> DOMString {
+pub trait HTMLHeadingElementMethods {
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&mut self, _align: DOMString);
+}
+
+impl<'a> HTMLHeadingElementMethods for JSRef<'a, HTMLHeadingElement> {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&mut self, _align: DOMString) {
+    fn SetAlign(&mut self, _align: DOMString) {
     }
 }

src/components/script/dom/htmlhrelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLHRElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLHRElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLHRElementTypeId;
@@ -28,56 +28,69 @@ impl HTMLHRElementDerived for EventTarget {
 }
 
 impl HTMLHRElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLHRElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLHRElement {
         HTMLHRElement {
             htmlelement: HTMLElement::new_inherited(HTMLHRElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLHRElement> {
-        let element = HTMLHRElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLHRElement> {
+        let element = HTMLHRElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLHRElementBinding::Wrap)
     }
 }
 
-impl HTMLHRElement {
-    pub fn Align(&self) -> DOMString {
+pub trait HTMLHRElementMethods {
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult;
+    fn Color(&self) -> DOMString;
+    fn SetColor(&mut self, _color: DOMString) -> ErrorResult;
+    fn NoShade(&self) -> bool;
+    fn SetNoShade(&self, _no_shade: bool) -> ErrorResult;
+    fn Size(&self) -> DOMString;
+    fn SetSize(&mut self, _size: DOMString) -> ErrorResult;
+    fn Width(&self) -> DOMString;
+    fn SetWidth(&mut self, _width: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLHRElementMethods for JSRef<'a, HTMLHRElement> {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Color(&self) -> DOMString {
+    fn Color(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetColor(&mut self, _color: DOMString) -> ErrorResult {
+    fn SetColor(&mut self, _color: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn NoShade(&self) -> bool {
+    fn NoShade(&self) -> bool {
         false
     }
 
-    pub fn SetNoShade(&self, _no_shade: bool) -> ErrorResult {
+    fn SetNoShade(&self, _no_shade: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Size(&self) -> DOMString {
+    fn Size(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetSize(&mut self, _size: DOMString) -> ErrorResult {
+    fn SetSize(&mut self, _size: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Width(&self) -> DOMString {
+    fn Width(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetWidth(&mut self, _width: DOMString) -> ErrorResult {
+    fn SetWidth(&mut self, _width: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlhtmlelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLHtmlElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLHtmlElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLHtmlElementTypeId;
@@ -28,24 +28,29 @@ impl HTMLHtmlElementDerived for EventTarget {
 }
 
 impl HTMLHtmlElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLHtmlElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLHtmlElement {
         HTMLHtmlElement {
             htmlelement: HTMLElement::new_inherited(HTMLHtmlElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLHtmlElement> {
-        let element = HTMLHtmlElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLHtmlElement> {
+        let element = HTMLHtmlElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLHtmlElementBinding::Wrap)
     }
 }
 
-impl HTMLHtmlElement {
-    pub fn Version(&self) -> DOMString {
+pub trait HTMLHtmlElementMethods {
+    fn Version(&self) -> DOMString;
+    fn SetVersion(&mut self, _version: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLHtmlElementMethods for JSRef<'a, HTMLHtmlElement> {
+    fn Version(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetVersion(&mut self, _version: DOMString) -> ErrorResult {
+    fn SetVersion(&mut self, _version: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmliframeelement.rs

@@ -5,7 +5,7 @@
 use dom::bindings::codegen::BindingDeclarations::HTMLIFrameElementBinding;
 use dom::bindings::codegen::InheritTypes::{ElementCast, HTMLIFrameElementDerived, HTMLElementCast};
 use dom::bindings::error::ErrorResult;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::trace::Untraceable;
 use dom::document::Document;
 use dom::element::{HTMLIFrameElementTypeId, Element};
@@ -54,18 +54,23 @@ pub struct IFrameSize {
     pub subpage_id: SubpageId,
 }
 
-impl HTMLIFrameElement {
-    pub fn is_sandboxed(&self) -> bool {
+pub trait HTMLIFrameElementHelpers {
+    fn is_sandboxed(&self) -> bool;
+    fn set_frame(&mut self, frame: Url);
+}
+
+impl<'a> HTMLIFrameElementHelpers for JSRef<'a, HTMLIFrameElement> {
+    fn is_sandboxed(&self) -> bool {
         self.sandbox.is_some()
     }
 
-    pub fn set_frame(&mut self, frame: Url) {
+    fn set_frame(&mut self, frame: Url) {
         *self.frame = Some(frame);
     }
 }
 
 impl HTMLIFrameElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLIFrameElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLIFrameElement {
         HTMLIFrameElement {
             htmlelement: HTMLElement::new_inherited(HTMLIFrameElementTypeId, localName, document),
             frame: Untraceable::new(None),
@@ -74,136 +79,168 @@ impl HTMLIFrameElement {
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLIFrameElement> {
-        let element = HTMLIFrameElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLIFrameElement> {
+        let element = HTMLIFrameElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLIFrameElementBinding::Wrap)
     }
 }
 
-impl HTMLIFrameElement {
-    pub fn Src(&self) -> DOMString {
+pub trait HTMLIFrameElementMethods {
+    fn Src(&self) -> DOMString;
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult;
+    fn Srcdoc(&self) -> DOMString;
+    fn SetSrcdoc(&mut self, _srcdoc: DOMString) -> ErrorResult;
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult;
+    fn Sandbox(&self) -> DOMString;
+    fn SetSandbox(&mut self, sandbox: DOMString);
+    fn AllowFullscreen(&self) -> bool;
+    fn SetAllowFullscreen(&mut self, _allow: bool) -> ErrorResult;
+    fn Width(&self) -> DOMString;
+    fn SetWidth(&mut self, _width: DOMString) -> ErrorResult;
+    fn Height(&self) -> DOMString;
+    fn SetHeight(&mut self, _height: DOMString) -> ErrorResult;
+    fn GetContentDocument(&self) -> Option<Temporary<Document>>;
+    fn GetContentWindow(&self) -> Option<Temporary<Window>>;
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult;
+    fn Scrolling(&self) -> DOMString;
+    fn SetScrolling(&mut self, _scrolling: DOMString) -> ErrorResult;
+    fn FrameBorder(&self) -> DOMString;
+    fn SetFrameBorder(&mut self, _frameborder: DOMString) -> ErrorResult;
+    fn LongDesc(&self) -> DOMString;
+    fn SetLongDesc(&mut self, _longdesc: DOMString) -> ErrorResult;
+    fn MarginHeight(&self) -> DOMString;
+    fn SetMarginHeight(&mut self, _marginheight: DOMString) -> ErrorResult;
+    fn MarginWidth(&self) -> DOMString;
+    fn SetMarginWidth(&mut self, _marginwidth: DOMString) -> ErrorResult;
+    fn GetSVGDocument(&self) -> Option<Temporary<Document>>;
+}
+
+impl<'a> HTMLIFrameElementMethods for JSRef<'a, HTMLIFrameElement> {
+    fn Src(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetSrc(&mut self, _src: DOMString) -> ErrorResult {
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Srcdoc(&self) -> DOMString {
+    fn Srcdoc(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetSrcdoc(&mut self, _srcdoc: DOMString) -> ErrorResult {
+    fn SetSrcdoc(&mut self, _srcdoc: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Name(&self) -> DOMString {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _name: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Sandbox(&self, abstract_self: &JS<HTMLIFrameElement>) -> DOMString {
-        let element: JS<Element> = ElementCast::from(abstract_self);
+    fn Sandbox(&self) -> DOMString {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
         element.get_string_attribute("sandbox")
     }
 
-    pub fn SetSandbox(&mut self, abstract_self: &mut JS<HTMLIFrameElement>, sandbox: DOMString) {
-        let mut element: JS<Element> = ElementCast::from(abstract_self);
+    fn SetSandbox(&mut self, sandbox: DOMString) {
+        let element: &mut JSRef<Element> = ElementCast::from_mut_ref(self);
         element.set_string_attribute("sandbox", sandbox);
     }
 
-    pub fn AllowFullscreen(&self) -> bool {
+    fn AllowFullscreen(&self) -> bool {
         false
     }
 
-    pub fn SetAllowFullscreen(&mut self, _allow: bool) -> ErrorResult {
+    fn SetAllowFullscreen(&mut self, _allow: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Width(&self) -> DOMString {
+    fn Width(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetWidth(&mut self, _width: DOMString) -> ErrorResult {
+    fn SetWidth(&mut self, _width: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Height(&self) -> DOMString {
+    fn Height(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetHeight(&mut self, _height: DOMString) -> ErrorResult {
+    fn SetHeight(&mut self, _height: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetContentDocument(&self) -> Option<JS<Document>> {
+    fn GetContentDocument(&self) -> Option<Temporary<Document>> {
         None
     }
 
-    pub fn GetContentWindow(&self) -> Option<JS<Window>> {
+    fn GetContentWindow(&self) -> Option<Temporary<Window>> {
         None
     }
 
-    pub fn Align(&self) -> DOMString {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Scrolling(&self) -> DOMString {
+    fn Scrolling(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetScrolling(&mut self, _scrolling: DOMString) -> ErrorResult {
+    fn SetScrolling(&mut self, _scrolling: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn FrameBorder(&self) -> DOMString {
+    fn FrameBorder(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetFrameBorder(&mut self, _frameborder: DOMString) -> ErrorResult {
+    fn SetFrameBorder(&mut self, _frameborder: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn LongDesc(&self) -> DOMString {
+    fn LongDesc(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetLongDesc(&mut self, _longdesc: DOMString) -> ErrorResult {
+    fn SetLongDesc(&mut self, _longdesc: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn MarginHeight(&self) -> DOMString {
+    fn MarginHeight(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetMarginHeight(&mut self, _marginheight: DOMString) -> ErrorResult {
+    fn SetMarginHeight(&mut self, _marginheight: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn MarginWidth(&self) -> DOMString {
+    fn MarginWidth(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetMarginWidth(&mut self, _marginwidth: DOMString) -> ErrorResult {
+    fn SetMarginWidth(&mut self, _marginwidth: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetSVGDocument(&self) -> Option<JS<Document>> {
+    fn GetSVGDocument(&self) -> Option<Temporary<Document>> {
         None
     }
 }
 
-impl VirtualMethods for JS<HTMLIFrameElement> {
-    fn super_type(&self) -> Option<~VirtualMethods:> {
-        let htmlelement: JS<HTMLElement> = HTMLElementCast::from(self);
-        Some(~htmlelement as ~VirtualMethods:)
+impl<'a> VirtualMethods for JSRef<'a, HTMLIFrameElement> {
+    fn super_type<'a>(&'a mut self) -> Option<&'a mut VirtualMethods:> {
+        let htmlelement: &mut JSRef<HTMLElement> = HTMLElementCast::from_mut_ref(self);
+        Some(htmlelement as &mut VirtualMethods:)
     }
 
     fn after_set_attr(&mut self, name: DOMString, value: DOMString) {
@@ -227,7 +264,7 @@ impl VirtualMethods for JS<HTMLIFrameElement> {
                     _ => AllowNothing
                 } as u8;
             }
-            self.get_mut().sandbox = Some(modes);
+            self.deref_mut().sandbox = Some(modes);
         }
     }
 
@@ -238,7 +275,7 @@ impl VirtualMethods for JS<HTMLIFrameElement> {
         }
 
         if "sandbox" == name {
-            self.get_mut().sandbox = None;
+            self.deref_mut().sandbox = None;
         }
     }
 }

src/components/script/dom/htmlimageelement.rs

@@ -5,7 +5,7 @@
 use dom::bindings::codegen::BindingDeclarations::HTMLImageElementBinding;
 use dom::bindings::codegen::InheritTypes::{NodeCast, ElementCast, HTMLElementCast, HTMLImageElementDerived};
 use dom::bindings::error::ErrorResult;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JS, JSRef, Temporary};
 use dom::bindings::trace::Untraceable;
 use dom::document::Document;
 use dom::element::{Element, HTMLImageElementTypeId};
@@ -35,31 +35,18 @@ impl HTMLImageElementDerived for EventTarget {
     }
 }
 
-impl HTMLImageElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLImageElement {
-        HTMLImageElement {
-            htmlelement: HTMLElement::new_inherited(HTMLImageElementTypeId, localName, document),
-            image: Untraceable::new(None),
-        }
-    }
-
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLImageElement> {
-        let element = HTMLImageElement::new_inherited(localName, document.clone());
-        Node::reflect_node(~element, document, HTMLImageElementBinding::Wrap)
-    }
+trait PrivateHTMLImageElementHelpers {
+    fn update_image(&mut self, value: Option<DOMString>, url: Option<Url>);
 }
 
-impl HTMLImageElement {
-    pub fn image<'a>(&'a self) -> &'a Option<Url> {
-        &*self.image
-    }
-
+impl<'a> PrivateHTMLImageElementHelpers for JSRef<'a, HTMLImageElement> {
     /// Makes the local `image` member match the status of the `src` attribute and starts
     /// prefetching the image. This method must be called after `src` is changed.
     fn update_image(&mut self, value: Option<DOMString>, url: Option<Url>) {
-        let elem = &mut self.htmlelement.element;
-        let document = elem.node.owner_doc();
-        let window = document.get().window.get();
+        let self_alias = self.clone();
+        let node_alias: &JSRef<Node> = NodeCast::from_ref(&self_alias);
+        let document = node_alias.owner_doc().root();
+        let window = document.deref().window.root();
         let image_cache = &window.image_cache_task;
         match value {
             None => {
@@ -78,154 +65,212 @@ impl HTMLImageElement {
             }
         }
     }
+}
 
-    pub fn Alt(&self, abstract_self: &JS<HTMLImageElement>) -> DOMString {
-        let element: JS<Element> = ElementCast::from(abstract_self);
+impl HTMLImageElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLImageElement {
+        HTMLImageElement {
+            htmlelement: HTMLElement::new_inherited(HTMLImageElementTypeId, localName, document),
+            image: Untraceable::new(None),
+        }
+    }
+
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLImageElement> {
+        let element = HTMLImageElement::new_inherited(localName, document);
+        Node::reflect_node(~element, document, HTMLImageElementBinding::Wrap)
+    }
+}
+
+pub trait LayoutHTMLImageElementHelpers {
+    unsafe fn image<'a>(&'a self) -> &'a Option<Url>;
+}
+
+impl LayoutHTMLImageElementHelpers for JS<HTMLImageElement> {
+    unsafe fn image<'a>(&'a self) -> &'a Option<Url> {
+        &*(*self.unsafe_get()).image
+    }
+}
+
+pub trait HTMLImageElementMethods {
+    fn Alt(&self) -> DOMString;
+    fn SetAlt(&mut self, alt: DOMString);
+    fn Src(&self) -> DOMString;
+    fn SetSrc(&mut self, src: DOMString);
+    fn CrossOrigin(&self) -> DOMString;
+    fn SetCrossOrigin(&mut self, _cross_origin: DOMString) -> ErrorResult;
+    fn UseMap(&self) -> DOMString;
+    fn SetUseMap(&mut self, use_map: DOMString);
+    fn IsMap(&self) -> bool;
+    fn SetIsMap(&mut self, is_map: bool);
+    fn Width(&self) -> u32;
+    fn SetWidth(&mut self, width: u32);
+    fn Height(&self) -> u32;
+    fn SetHeight(&mut self, height: u32);
+    fn NaturalWidth(&self) -> u32;
+    fn NaturalHeight(&self) -> u32;
+    fn Complete(&self) -> bool;
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, name: DOMString);
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&mut self, align: DOMString);
+    fn Hspace(&self) -> u32;
+    fn SetHspace(&mut self, hspace: u32);
+    fn Vspace(&self) -> u32;
+    fn SetVspace(&mut self, vspace: u32);
+    fn LongDesc(&self) -> DOMString;
+    fn SetLongDesc(&mut self, longdesc: DOMString);
+    fn Border(&self) -> DOMString;
+    fn SetBorder(&mut self, border: DOMString);
+}
+
+impl<'a> HTMLImageElementMethods for JSRef<'a, HTMLImageElement> {
+    fn Alt(&self) -> DOMString {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
         element.get_string_attribute("alt")
     }
 
-    pub fn SetAlt(&mut self, abstract_self: &JS<HTMLImageElement>, alt: DOMString) {
-        let mut element: JS<Element> = ElementCast::from(abstract_self);
+    fn SetAlt(&mut self, alt: DOMString) {
+        let element: &mut JSRef<Element> = ElementCast::from_mut_ref(self);
         element.set_string_attribute("alt", alt)
     }
 
-    pub fn Src(&self, abstract_self: &JS<HTMLImageElement>) -> DOMString {
-        let element: JS<Element> = ElementCast::from(abstract_self);
+    fn Src(&self) -> DOMString {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
         element.get_string_attribute("src")
     }
 
-    pub fn SetSrc(&mut self, abstract_self: &mut JS<HTMLImageElement>, src: DOMString) {
-        let mut element: JS<Element> = ElementCast::from(abstract_self);
+    fn SetSrc(&mut self, src: DOMString) {
+        let element: &mut JSRef<Element> = ElementCast::from_mut_ref(self);
         element.set_url_attribute("src", src)
     }
 
-    pub fn CrossOrigin(&self) -> DOMString {
+    fn CrossOrigin(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCrossOrigin(&mut self, _cross_origin: DOMString) -> ErrorResult {
+    fn SetCrossOrigin(&mut self, _cross_origin: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn UseMap(&self, abstract_self: &JS<HTMLImageElement>) -> DOMString {
-        let element: JS<Element> = ElementCast::from(abstract_self);
+    fn UseMap(&self) -> DOMString {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
         element.get_string_attribute("useMap")
     }
 
-    pub fn SetUseMap(&mut self, abstract_self: &mut JS<HTMLImageElement>, use_map: DOMString) {
-        let mut element: JS<Element> = ElementCast::from(abstract_self);
+    fn SetUseMap(&mut self, use_map: DOMString) {
+        let element: &mut JSRef<Element> = ElementCast::from_mut_ref(self);
         element.set_string_attribute("useMap", use_map)
     }
 
-    pub fn IsMap(&self, abstract_self: &JS<HTMLImageElement>) -> bool {
-        let element: JS<Element> = ElementCast::from(abstract_self);
+    fn IsMap(&self) -> bool {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
         from_str::<bool>(element.get_string_attribute("hspace")).unwrap()
     }
 
-    pub fn SetIsMap(&self, abstract_self: &mut JS<HTMLImageElement>, is_map: bool) {
-        let mut element: JS<Element> = ElementCast::from(abstract_self);
+    fn SetIsMap(&mut self, is_map: bool) {
+        let element: &mut JSRef<Element> = ElementCast::from_mut_ref(self);
         element.set_string_attribute("isMap", is_map.to_str())
     }
 
-    pub fn Width(&self, abstract_self: &JS<HTMLImageElement>) -> u32 {
-        let node: JS<Node> = NodeCast::from(abstract_self);
+    fn Width(&self) -> u32 {
+        let node: &JSRef<Node> = NodeCast::from_ref(self);
         let rect = node.get_bounding_content_box();
         to_px(rect.size.width) as u32
     }
 
-    pub fn SetWidth(&mut self, abstract_self: &JS<HTMLImageElement>, width: u32) {
-        let mut elem: JS<Element> = ElementCast::from(abstract_self);
+    fn SetWidth(&mut self, width: u32) {
+        let elem: &mut JSRef<Element> = ElementCast::from_mut_ref(self);
         elem.set_uint_attribute("width", width)
     }
 
-    pub fn Height(&self, abstract_self: &JS<HTMLImageElement>) -> u32 {
-        let node: JS<Node> = NodeCast::from(abstract_self);
+    fn Height(&self) -> u32 {
+        let node: &JSRef<Node> = NodeCast::from_ref(self);
         let rect = node.get_bounding_content_box();
         to_px(rect.size.height) as u32
     }
 
-    pub fn SetHeight(&mut self, abstract_self: &JS<HTMLImageElement>, height: u32) {
-        let mut elem: JS<Element> = ElementCast::from(abstract_self);
+    fn SetHeight(&mut self, height: u32) {
+        let elem: &mut JSRef<Element> = ElementCast::from_mut_ref(self);
         elem.set_uint_attribute("height", height)
     }
 
-    pub fn NaturalWidth(&self) -> u32 {
+    fn NaturalWidth(&self) -> u32 {
         0
     }
 
-    pub fn NaturalHeight(&self) -> u32 {
+    fn NaturalHeight(&self) -> u32 {
         0
     }
 
-    pub fn Complete(&self) -> bool {
+    fn Complete(&self) -> bool {
         false
     }
 
-    pub fn Name(&self, abstract_self: &JS<HTMLImageElement>) -> DOMString {
-        let element: JS<Element> = ElementCast::from(abstract_self);
+    fn Name(&self) -> DOMString {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
         element.get_string_attribute("name")
     }
 
-    pub fn SetName(&mut self, abstract_self: &mut JS<HTMLImageElement>, name: DOMString) {
-        let mut element: JS<Element> = ElementCast::from(abstract_self);
+    fn SetName(&mut self, name: DOMString) {
+        let element: &mut JSRef<Element> = ElementCast::from_mut_ref(self);
         element.set_string_attribute("name", name)
     }
 
-    pub fn Align(&self, abstract_self: &JS<HTMLImageElement>) -> DOMString {
-        let element: JS<Element> = ElementCast::from(abstract_self);
-        element.get_string_attribute("longdesc")
+    fn Align(&self) -> DOMString {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
+        element.get_string_attribute("align")
     }
 
-    pub fn SetAlign(&mut self, abstract_self: &mut JS<HTMLImageElement>, align: DOMString) {
-        let mut element: JS<Element> = ElementCast::from(abstract_self);
+    fn SetAlign(&mut self, align: DOMString) {
+        let element: &mut JSRef<Element> = ElementCast::from_mut_ref(self);
         element.set_string_attribute("align", align)
     }
 
-    pub fn Hspace(&self, abstract_self: &JS<HTMLImageElement>) -> u32 {
-        let element: JS<Element> = ElementCast::from(abstract_self);
+    fn Hspace(&self) -> u32 {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
         from_str::<u32>(element.get_string_attribute("hspace")).unwrap()
     }
 
-    pub fn SetHspace(&mut self, abstract_self: &mut JS<HTMLImageElement>, hspace: u32) {
-        let mut element: JS<Element> = ElementCast::from(abstract_self);
+    fn SetHspace(&mut self, hspace: u32) {
+        let element: &mut JSRef<Element> = ElementCast::from_mut_ref(self);
         element.set_uint_attribute("hspace", hspace)
     }
 
-    pub fn Vspace(&self, abstract_self: &JS<HTMLImageElement>) -> u32 {
-        let element: JS<Element> = ElementCast::from(abstract_self);
+    fn Vspace(&self) -> u32 {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
         from_str::<u32>(element.get_string_attribute("vspace")).unwrap()
     }
 
-    pub fn SetVspace(&mut self, abstract_self: &mut JS<HTMLImageElement>, vspace: u32) {
-        let mut element: JS<Element> = ElementCast::from(abstract_self);
+    fn SetVspace(&mut self, vspace: u32) {
+        let element: &mut JSRef<Element> = ElementCast::from_mut_ref(self);
         element.set_uint_attribute("vspace", vspace)
     }
 
-    pub fn LongDesc(&self, abstract_self: &JS<HTMLImageElement>) -> DOMString {
-        let element: JS<Element> = ElementCast::from(abstract_self);
+    fn LongDesc(&self) -> DOMString {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
         element.get_string_attribute("longdesc")
     }
 
-    pub fn SetLongDesc(&mut self, abstract_self: &mut JS<HTMLImageElement>, longdesc: DOMString) {
-        let mut element: JS<Element> = ElementCast::from(abstract_self);
+    fn SetLongDesc(&mut self, longdesc: DOMString) {
+        let element: &mut JSRef<Element> = ElementCast::from_mut_ref(self);
         element.set_string_attribute("longdesc", longdesc)
     }
 
-    pub fn Border(&self, abstract_self: &JS<HTMLImageElement>) -> DOMString {
-        let element: JS<Element> = ElementCast::from(abstract_self);
+    fn Border(&self) -> DOMString {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
         element.get_string_attribute("border")
     }
 
-    pub fn SetBorder(&mut self, abstract_self: &mut JS<HTMLImageElement>, border: DOMString) {
-        let mut element: JS<Element> = ElementCast::from(abstract_self);
+    fn SetBorder(&mut self, border: DOMString) {
+        let element: &mut JSRef<Element> = ElementCast::from_mut_ref(self);
         element.set_string_attribute("border", border)
     }
 }
 
-impl VirtualMethods for JS<HTMLImageElement> {
-    fn super_type(&self) -> Option<~VirtualMethods:> {
-        let htmlelement: JS<HTMLElement> = HTMLElementCast::from(self);
-        Some(~htmlelement as ~VirtualMethods:)
+impl<'a> VirtualMethods for JSRef<'a, HTMLImageElement> {
+    fn super_type<'a>(&'a mut self) -> Option<&'a mut VirtualMethods:> {
+        let htmlelement: &mut JSRef<HTMLElement> = HTMLElementCast::from_mut_ref(self);
+        Some(htmlelement as &mut VirtualMethods:)
     }
 
     fn after_set_attr(&mut self, name: DOMString, value: DOMString) {
@@ -235,9 +280,9 @@ impl VirtualMethods for JS<HTMLImageElement> {
         }
 
         if "src" == name {
-            let window = window_from_node(self);
-            let url = Some(window.get().get_url());
-            self.get_mut().update_image(Some(value), url);
+            let window = window_from_node(self).root();
+            let url = Some(window.deref().get_url());
+            self.update_image(Some(value), url);
         }
     }
 
@@ -248,7 +293,7 @@ impl VirtualMethods for JS<HTMLImageElement> {
         }
 
         if "src" == name {
-            self.get_mut().update_image(None, None);
+            self.update_image(None, None);
         }
     }
 }

src/components/script/dom/htmlinputelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLInputElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLInputElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::{ErrorResult, Fallible};
 use dom::document::Document;
 use dom::element::HTMLInputElementTypeId;
@@ -28,322 +28,403 @@ impl HTMLInputElementDerived for EventTarget {
 }
 
 impl HTMLInputElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLInputElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLInputElement {
         HTMLInputElement {
             htmlelement: HTMLElement::new_inherited(HTMLInputElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLInputElement> {
-        let element = HTMLInputElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLInputElement> {
+        let element = HTMLInputElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLInputElementBinding::Wrap)
     }
 }
 
-impl HTMLInputElement {
-    pub fn Accept(&self) -> DOMString {
+pub trait HTMLInputElementMethods {
+    fn Accept(&self) -> DOMString;
+    fn SetAccept(&mut self, _accept: DOMString) -> ErrorResult;
+    fn Alt(&self) -> DOMString;
+    fn SetAlt(&mut self, _alt: DOMString) -> ErrorResult;
+    fn Autocomplete(&self) -> DOMString;
+    fn SetAutocomplete(&mut self, _autocomple: DOMString) -> ErrorResult;
+    fn Autofocus(&self) -> bool;
+    fn SetAutofocus(&mut self, _autofocus: bool) -> ErrorResult;
+    fn DefaultChecked(&self) -> bool;
+    fn SetDefaultChecked(&mut self, _default_checked: bool) -> ErrorResult;
+    fn Checked(&self) -> bool;
+    fn SetChecked(&mut self, _checked: bool);
+    fn Disabled(&self) -> bool;
+    fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult;
+    fn FormAction(&self) -> DOMString;
+    fn SetFormAction(&mut self, _form_action: DOMString) -> ErrorResult;
+    fn FormEnctype(&self) -> DOMString;
+    fn SetFormEnctype(&mut self, _form_enctype: DOMString) -> ErrorResult;
+    fn FormMethod(&self) -> DOMString;
+    fn SetFormMethod(&mut self, _form_method: DOMString) -> ErrorResult;
+    fn FormNoValidate(&self) -> bool;
+    fn SetFormNoValidate(&mut self, _form_no_validate: bool) -> ErrorResult;
+    fn FormTarget(&self) -> DOMString;
+    fn SetFormTarget(&mut self, _form_target: DOMString) -> ErrorResult;
+    fn Height(&self) -> u32;
+    fn SetHeight(&mut self, _height: u32) -> ErrorResult;
+    fn Indeterminate(&self) -> bool;
+    fn SetIndeterminate(&mut self, _indeterminate: bool);
+    fn InputMode(&self) -> DOMString;
+    fn SetInputMode(&mut self, _input_mode: DOMString) -> ErrorResult;
+    fn Max(&self) -> DOMString;
+    fn SetMax(&mut self, _max: DOMString) -> ErrorResult;
+    fn MaxLength(&self) -> i32;
+    fn SetMaxLength(&mut self, _max_length: i32) -> ErrorResult;
+    fn Min(&self) -> DOMString;
+    fn SetMin(&mut self, _min: DOMString) -> ErrorResult;
+    fn Multiple(&self) -> bool;
+    fn SetMultiple(&mut self, _multiple: bool) -> ErrorResult;
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult;
+    fn Pattern(&self) -> DOMString;
+    fn SetPattern(&mut self, _pattern: DOMString) -> ErrorResult;
+    fn Placeholder(&self) -> DOMString;
+    fn SetPlaceholder(&mut self, _placeholder: DOMString) -> ErrorResult;
+    fn ReadOnly(&self) -> bool;
+    fn SetReadOnly(&mut self, _read_only: bool) -> ErrorResult;
+    fn Required(&self) -> bool;
+    fn SetRequired(&mut self, _required: bool) -> ErrorResult;
+    fn Size(&self) -> u32;
+    fn SetSize(&mut self, _size: u32) -> ErrorResult;
+    fn Src(&self) -> DOMString;
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult;
+    fn Step(&self) -> DOMString;
+    fn SetStep(&mut self, _step: DOMString) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult;
+    fn DefaultValue(&self) -> DOMString;
+    fn SetDefaultValue(&mut self, _default_value: DOMString) -> ErrorResult;
+    fn Value(&self) -> DOMString;
+    fn SetValue(&mut self, _value: DOMString) -> ErrorResult;
+    fn Width(&self) -> u32;
+    fn SetWidth(&mut self, _width: u32);
+    fn WillValidate(&self) -> bool;
+    fn SetWillValidate(&self, _will_validate: bool);
+    fn GetValidationMessage(&self) -> Fallible<DOMString>;
+    fn CheckValidity(&self) -> bool;
+    fn SetCustomValidity(&self, _error: DOMString);
+    fn Select(&self);
+    fn GetSelectionStart(&self) -> Fallible<i32>;
+    fn SetSelectionStart(&mut self, _selection_start: i32) -> ErrorResult;
+    fn GetSelectionEnd(&self) -> Fallible<i32>;
+    fn SetSelectionEnd(&mut self, _selection_end: i32) -> ErrorResult;
+    fn GetSelectionDirection(&self) -> Fallible<DOMString>;
+    fn SetSelectionDirection(&mut self, _selection_direction: DOMString) -> ErrorResult;
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult;
+    fn UseMap(&self) -> DOMString;
+    fn SetUseMap(&mut self, _align: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLInputElementMethods for JSRef<'a, HTMLInputElement> {
+    fn Accept(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAccept(&mut self, _accept: DOMString) -> ErrorResult {
+    fn SetAccept(&mut self, _accept: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Alt(&self) -> DOMString {
+    fn Alt(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlt(&mut self, _alt: DOMString) -> ErrorResult {
+    fn SetAlt(&mut self, _alt: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Autocomplete(&self) -> DOMString {
+    fn Autocomplete(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAutocomplete(&mut self, _autocomple: DOMString) -> ErrorResult {
+    fn SetAutocomplete(&mut self, _autocomple: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Autofocus(&self) -> bool {
+    fn Autofocus(&self) -> bool {
         false
     }
 
-    pub fn SetAutofocus(&mut self, _autofocus: bool) -> ErrorResult {
+    fn SetAutofocus(&mut self, _autofocus: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn DefaultChecked(&self) -> bool {
+    fn DefaultChecked(&self) -> bool {
         false
     }
 
-    pub fn SetDefaultChecked(&mut self, _default_checked: bool) -> ErrorResult {
+    fn SetDefaultChecked(&mut self, _default_checked: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Checked(&self) -> bool {
+    fn Checked(&self) -> bool {
         false
     }
 
-    pub fn SetChecked(&mut self, _checked: bool) {
+    fn SetChecked(&mut self, _checked: bool) {
     }
 
-    pub fn Disabled(&self) -> bool {
+    fn Disabled(&self) -> bool {
         false
     }
 
-    pub fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult {
+    fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn FormAction(&self) -> DOMString {
+    fn FormAction(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetFormAction(&mut self, _form_action: DOMString) -> ErrorResult {
+    fn SetFormAction(&mut self, _form_action: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn FormEnctype(&self) -> DOMString {
+    fn FormEnctype(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetFormEnctype(&mut self, _form_enctype: DOMString) -> ErrorResult {
+    fn SetFormEnctype(&mut self, _form_enctype: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn FormMethod(&self) -> DOMString {
+    fn FormMethod(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetFormMethod(&mut self, _form_method: DOMString) -> ErrorResult {
+    fn SetFormMethod(&mut self, _form_method: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn FormNoValidate(&self) -> bool {
+    fn FormNoValidate(&self) -> bool {
         false
     }
 
-    pub fn SetFormNoValidate(&mut self, _form_no_validate: bool) -> ErrorResult {
+    fn SetFormNoValidate(&mut self, _form_no_validate: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn FormTarget(&self) -> DOMString {
+    fn FormTarget(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetFormTarget(&mut self, _form_target: DOMString) -> ErrorResult {
+    fn SetFormTarget(&mut self, _form_target: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Height(&self) -> u32 {
+    fn Height(&self) -> u32 {
         0
     }
 
-    pub fn SetHeight(&mut self, _height: u32) -> ErrorResult {
+    fn SetHeight(&mut self, _height: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Indeterminate(&self) -> bool {
+    fn Indeterminate(&self) -> bool {
         false
     }
 
-    pub fn SetIndeterminate(&mut self, _indeterminate: bool) {
+    fn SetIndeterminate(&mut self, _indeterminate: bool) {
     }
 
-    pub fn InputMode(&self) -> DOMString {
+    fn InputMode(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetInputMode(&mut self, _input_mode: DOMString) -> ErrorResult {
+    fn SetInputMode(&mut self, _input_mode: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Max(&self) -> DOMString {
+    fn Max(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetMax(&mut self, _max: DOMString) -> ErrorResult {
+    fn SetMax(&mut self, _max: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn MaxLength(&self) -> i32 {
+    fn MaxLength(&self) -> i32 {
         0
     }
 
-    pub fn SetMaxLength(&mut self, _max_length: i32) -> ErrorResult {
+    fn SetMaxLength(&mut self, _max_length: i32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Min(&self) -> DOMString {
+    fn Min(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetMin(&mut self, _min: DOMString) -> ErrorResult {
+    fn SetMin(&mut self, _min: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Multiple(&self) -> bool {
+    fn Multiple(&self) -> bool {
         false
     }
 
-    pub fn SetMultiple(&mut self, _multiple: bool) -> ErrorResult {
+    fn SetMultiple(&mut self, _multiple: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Name(&self) -> DOMString {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _name: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Pattern(&self) -> DOMString {
+    fn Pattern(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetPattern(&mut self, _pattern: DOMString) -> ErrorResult {
+    fn SetPattern(&mut self, _pattern: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Placeholder(&self) -> DOMString {
+    fn Placeholder(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetPlaceholder(&mut self, _placeholder: DOMString) -> ErrorResult {
+    fn SetPlaceholder(&mut self, _placeholder: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn ReadOnly(&self) -> bool {
+    fn ReadOnly(&self) -> bool {
         false
     }
 
-    pub fn SetReadOnly(&mut self, _read_only: bool) -> ErrorResult {
+    fn SetReadOnly(&mut self, _read_only: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Required(&self) -> bool {
+    fn Required(&self) -> bool {
         false
     }
 
-    pub fn SetRequired(&mut self, _required: bool) -> ErrorResult {
+    fn SetRequired(&mut self, _required: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Size(&self) -> u32 {
+    fn Size(&self) -> u32 {
         0
     }
 
-    pub fn SetSize(&mut self, _size: u32) -> ErrorResult {
+    fn SetSize(&mut self, _size: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Src(&self) -> DOMString {
+    fn Src(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetSrc(&mut self, _src: DOMString) -> ErrorResult {
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Step(&self) -> DOMString {
+    fn Step(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetStep(&mut self, _step: DOMString) -> ErrorResult {
+    fn SetStep(&mut self, _step: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetType(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn DefaultValue(&self) -> DOMString {
+    fn DefaultValue(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetDefaultValue(&mut self, _default_value: DOMString) -> ErrorResult {
+    fn SetDefaultValue(&mut self, _default_value: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Value(&self) -> DOMString {
+    fn Value(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetValue(&mut self, _value: DOMString) -> ErrorResult {
+    fn SetValue(&mut self, _value: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Width(&self) -> u32 {
+    fn Width(&self) -> u32 {
         0
     }
 
-    pub fn SetWidth(&mut self, _width: u32) {
+    fn SetWidth(&mut self, _width: u32) {
     }
 
-    pub fn WillValidate(&self) -> bool {
+    fn WillValidate(&self) -> bool {
         false
     }
 
-    pub fn SetWillValidate(&self, _will_validate: bool) {
+    fn SetWillValidate(&self, _will_validate: bool) {
     }
 
-    pub fn GetValidationMessage(&self) -> Fallible<DOMString> {
+    fn GetValidationMessage(&self) -> Fallible<DOMString> {
         Ok(~"")
     }
 
-    pub fn CheckValidity(&self) -> bool {
+    fn CheckValidity(&self) -> bool {
         false
     }
 
-    pub fn SetCustomValidity(&self, _error: DOMString) {
+    fn SetCustomValidity(&self, _error: DOMString) {
     }
 
-    pub fn Select(&self) {
+    fn Select(&self) {
     }
 
-    pub fn GetSelectionStart(&self) -> Fallible<i32> {
+    fn GetSelectionStart(&self) -> Fallible<i32> {
         Ok(0)
     }
 
-    pub fn SetSelectionStart(&mut self, _selection_start: i32) -> ErrorResult {
+    fn SetSelectionStart(&mut self, _selection_start: i32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetSelectionEnd(&self) -> Fallible<i32> {
+    fn GetSelectionEnd(&self) -> Fallible<i32> {
         Ok(0)
     }
 
-    pub fn SetSelectionEnd(&mut self, _selection_end: i32) -> ErrorResult {
+    fn SetSelectionEnd(&mut self, _selection_end: i32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetSelectionDirection(&self) -> Fallible<DOMString> {
+    fn GetSelectionDirection(&self) -> Fallible<DOMString> {
         Ok(~"")
     }
 
-    pub fn SetSelectionDirection(&mut self, _selection_direction: DOMString) -> ErrorResult {
+    fn SetSelectionDirection(&mut self, _selection_direction: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Align(&self) -> DOMString {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn UseMap(&self) -> DOMString {
+    fn UseMap(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetUseMap(&mut self, _align: DOMString) -> ErrorResult {
+    fn SetUseMap(&mut self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmllabelelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLLabelElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLLabelElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::element::HTMLLabelElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
@@ -27,23 +27,28 @@ impl HTMLLabelElementDerived for EventTarget {
 }
 
 impl HTMLLabelElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLLabelElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLLabelElement {
         HTMLLabelElement {
             htmlelement: HTMLElement::new_inherited(HTMLLabelElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLLabelElement> {
-        let element = HTMLLabelElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLLabelElement> {
+        let element = HTMLLabelElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLLabelElementBinding::Wrap)
     }
 }
 
-impl HTMLLabelElement {
-    pub fn HtmlFor(&self) -> DOMString {
+pub trait HTMLLabelElementMethods {
+    fn HtmlFor(&self) -> DOMString;
+    fn SetHtmlFor(&mut self, _html_for: DOMString);
+}
+
+impl<'a> HTMLLabelElementMethods for JSRef<'a, HTMLLabelElement> {
+    fn HtmlFor(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetHtmlFor(&mut self, _html_for: DOMString) {
+    fn SetHtmlFor(&mut self, _html_for: DOMString) {
     }
 }

src/components/script/dom/htmllegendelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLLegendElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLLegendElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLLegendElementTypeId;
@@ -28,24 +28,29 @@ impl HTMLLegendElementDerived for EventTarget {
 }
 
 impl HTMLLegendElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLLegendElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLLegendElement {
         HTMLLegendElement {
             htmlelement: HTMLElement::new_inherited(HTMLLegendElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLLegendElement> {
-        let element = HTMLLegendElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLLegendElement> {
+        let element = HTMLLegendElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLLegendElementBinding::Wrap)
     }
 }
 
-impl HTMLLegendElement {
-    pub fn Align(&self) -> DOMString {
+pub trait HTMLLegendElementMethods {
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLLegendElementMethods for JSRef<'a, HTMLLegendElement> {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmllielement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLLIElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLLIElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLLIElementTypeId;
@@ -28,32 +28,39 @@ impl HTMLLIElementDerived for EventTarget {
 }
 
 impl HTMLLIElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLLIElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLLIElement {
         HTMLLIElement {
             htmlelement: HTMLElement::new_inherited(HTMLLIElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLLIElement> {
-        let element = HTMLLIElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLLIElement> {
+        let element = HTMLLIElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLLIElementBinding::Wrap)
     }
 }
 
-impl HTMLLIElement {
-    pub fn Value(&self) -> i32 {
+pub trait HTMLLIElementMethods {
+    fn Value(&self) -> i32;
+    fn SetValue(&mut self, _value: i32) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLLIElementMethods for JSRef<'a, HTMLLIElement> {
+    fn Value(&self) -> i32 {
         0
     }
 
-    pub fn SetValue(&mut self, _value: i32) -> ErrorResult {
+    fn SetValue(&mut self, _value: i32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetType(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmllinkelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLLinkElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLLinkElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLLinkElementTypeId;
@@ -28,95 +28,118 @@ impl HTMLLinkElementDerived for EventTarget {
 }
 
 impl HTMLLinkElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLLinkElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLLinkElement {
         HTMLLinkElement {
             htmlelement: HTMLElement::new_inherited(HTMLLinkElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLLinkElement> {
-        let element = HTMLLinkElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLLinkElement> {
+        let element = HTMLLinkElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLLinkElementBinding::Wrap)
     }
 }
 
-impl HTMLLinkElement {
-    pub fn Disabled(&self) -> bool {
+pub trait HTMLLinkElementMethods {
+    fn Disabled(&self) -> bool;
+    fn SetDisabled(&mut self, _disable: bool);
+    fn Href(&self) -> DOMString;
+    fn SetHref(&mut self, _href: DOMString) -> ErrorResult;
+    fn CrossOrigin(&self) -> DOMString;
+    fn SetCrossOrigin(&mut self, _cross_origin: DOMString) -> ErrorResult;
+    fn Rel(&self) -> DOMString;
+    fn SetRel(&mut self, _rel: DOMString) -> ErrorResult;
+    fn Media(&self) -> DOMString;
+    fn SetMedia(&mut self, _media: DOMString) -> ErrorResult;
+    fn Hreflang(&self) -> DOMString;
+    fn SetHreflang(&mut self, _href: DOMString) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult;
+    fn Charset(&self) -> DOMString;
+    fn SetCharset(&mut self, _charset: DOMString) -> ErrorResult;
+    fn Rev(&self) -> DOMString;
+    fn SetRev(&mut self, _rev: DOMString) -> ErrorResult;
+    fn Target(&self) -> DOMString;
+    fn SetTarget(&mut self, _target: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLLinkElementMethods for JSRef<'a, HTMLLinkElement> {
+    fn Disabled(&self) -> bool {
         false
     }
 
-    pub fn SetDisabled(&mut self, _disable: bool) {
+    fn SetDisabled(&mut self, _disable: bool) {
     }
 
-    pub fn Href(&self) -> DOMString {
+    fn Href(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetHref(&mut self, _href: DOMString) -> ErrorResult {
+    fn SetHref(&mut self, _href: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn CrossOrigin(&self) -> DOMString {
+    fn CrossOrigin(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCrossOrigin(&mut self, _cross_origin: DOMString) -> ErrorResult {
+    fn SetCrossOrigin(&mut self, _cross_origin: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Rel(&self) -> DOMString {
+    fn Rel(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetRel(&mut self, _rel: DOMString) -> ErrorResult {
+    fn SetRel(&mut self, _rel: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Media(&self) -> DOMString {
+    fn Media(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetMedia(&mut self, _media: DOMString) -> ErrorResult {
+    fn SetMedia(&mut self, _media: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Hreflang(&self) -> DOMString {
+    fn Hreflang(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetHreflang(&mut self, _href: DOMString) -> ErrorResult {
+    fn SetHreflang(&mut self, _href: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetType(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Charset(&self) -> DOMString {
+    fn Charset(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCharset(&mut self, _charset: DOMString) -> ErrorResult {
+    fn SetCharset(&mut self, _charset: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Rev(&self) -> DOMString {
+    fn Rev(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetRev(&mut self, _rev: DOMString) -> ErrorResult {
+    fn SetRev(&mut self, _rev: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Target(&self) -> DOMString {
+    fn Target(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetTarget(&mut self, _target: DOMString) -> ErrorResult {
+    fn SetTarget(&mut self, _target: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlmainelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLMainElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLMainElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::element::HTMLMainElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
@@ -27,14 +27,17 @@ impl HTMLMainElementDerived for EventTarget {
 }
 
 impl HTMLMainElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLMainElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLMainElement {
         HTMLMainElement {
             htmlelement: HTMLElement::new_inherited(HTMLMainElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLMainElement> {
-        let element = HTMLMainElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLMainElement> {
+        let element = HTMLMainElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLMainElementBinding::Wrap)
     }
 }
+
+pub trait HTMLMainElementMethods {
+}

src/components/script/dom/htmlmapelement.rs

@@ -4,14 +4,14 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLMapElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLMapElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLMapElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
 use dom::htmlcollection::{HTMLCollection, Static};
 use dom::htmlelement::HTMLElement;
-use dom::node::{Node, ElementNodeTypeId};
+use dom::node::{Node, ElementNodeTypeId, window_from_node};
 use servo_util::str::DOMString;
 
 #[deriving(Encodable)]
@@ -29,31 +29,37 @@ impl HTMLMapElementDerived for EventTarget {
 }
 
 impl HTMLMapElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLMapElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLMapElement {
         HTMLMapElement {
             htmlelement: HTMLElement::new_inherited(HTMLMapElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLMapElement> {
-        let element = HTMLMapElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLMapElement> {
+        let element = HTMLMapElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLMapElementBinding::Wrap)
     }
 }
 
-impl HTMLMapElement {
-    pub fn Name(&self) -> DOMString {
+pub trait HTMLMapElementMethods {
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult;
+    fn Areas(&self) -> Temporary<HTMLCollection>;
+}
+
+impl<'a> HTMLMapElementMethods for JSRef<'a, HTMLMapElement> {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _name: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Areas(&self) -> JS<HTMLCollection> {
+    fn Areas(&self) -> Temporary<HTMLCollection> {
         // FIXME: https://github.com/mozilla/servo/issues/1845
-        let doc = self.htmlelement.element.node.owner_doc();
-        let doc = doc.get();
-        HTMLCollection::new(&doc.window, Static(vec!()))
+        let window = window_from_node(self).root();
+        HTMLCollection::new(&*window, Static(vec!()))
     }
 }
+

src/components/script/dom/htmlmediaelement.rs

@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef};
 use dom::bindings::codegen::InheritTypes::HTMLMediaElementDerived;
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
@@ -28,146 +28,182 @@ impl HTMLMediaElementDerived for EventTarget {
 }
 
 impl HTMLMediaElement {
-    pub fn new_inherited(type_id: ElementTypeId, tag_name: DOMString, document: JS<Document>) -> HTMLMediaElement {
+    pub fn new_inherited(type_id: ElementTypeId, tag_name: DOMString, document: &JSRef<Document>) -> HTMLMediaElement {
         HTMLMediaElement {
             htmlelement: HTMLElement::new_inherited(type_id, tag_name, document)
         }
     }
 }
 
-impl HTMLMediaElement {
-    pub fn Src(&self) -> DOMString {
+pub trait HTMLMediaElementMethods {
+    fn Src(&self) -> DOMString;
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult;
+    fn CurrentSrc(&self) -> DOMString;
+    fn CrossOrigin(&self) -> DOMString;
+    fn SetCrossOrigin(&mut self, _cross_origin: DOMString) -> ErrorResult;
+    fn Preload(&self) -> DOMString;
+    fn SetPreload(&mut self, _preload: DOMString) -> ErrorResult;
+    fn Load(&self);
+    fn CanPlayType(&self, _type: DOMString) -> DOMString;
+    fn ReadyState(&self) -> u16;
+    fn Seeking(&self) -> bool;
+    fn CurrentTime(&self) -> f64;
+    fn SetCurrentTime(&mut self, _current_time: f64) -> ErrorResult;
+    fn GetDuration(&self) -> f64;
+    fn Paused(&self) -> bool;
+    fn DefaultPlaybackRate(&self) -> f64;
+    fn SetDefaultPlaybackRate(&mut self, _default_playback_rate: f64) -> ErrorResult;
+    fn PlaybackRate(&self) -> f64;
+    fn SetPlaybackRate(&mut self, _playback_rate: f64) -> ErrorResult;
+    fn Ended(&self) -> bool;
+    fn Autoplay(&self) -> bool;
+    fn SetAutoplay(&mut self, _autoplay: bool) -> ErrorResult;
+    fn Loop(&self) -> bool;
+    fn SetLoop(&mut self, _loop: bool) -> ErrorResult;
+    fn Play(&self) -> ErrorResult;
+    fn Pause(&self) -> ErrorResult;
+    fn Controls(&self) -> bool;
+    fn SetControls(&mut self, _controls: bool) -> ErrorResult;
+    fn Volume(&self) -> f64;
+    fn SetVolume(&mut self, _volume: f64) -> ErrorResult;
+    fn Muted(&self) -> bool;
+    fn SetMuted(&mut self, _muted: bool);
+    fn DefaultMuted(&self) -> bool;
+    fn SetDefaultMuted(&mut self, _default_muted: bool) -> ErrorResult;
+}
+
+impl<'a> HTMLMediaElementMethods for JSRef<'a, HTMLMediaElement> {
+    fn Src(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetSrc(&mut self, _src: DOMString) -> ErrorResult {
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn CurrentSrc(&self) -> DOMString {
+    fn CurrentSrc(&self) -> DOMString {
         ~""
     }
 
-    pub fn CrossOrigin(&self) -> DOMString {
+    fn CrossOrigin(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCrossOrigin(&mut self, _cross_origin: DOMString) -> ErrorResult {
+    fn SetCrossOrigin(&mut self, _cross_origin: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Preload(&self) -> DOMString {
+    fn Preload(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetPreload(&mut self, _preload: DOMString) -> ErrorResult {
+    fn SetPreload(&mut self, _preload: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Load(&self) {
+    fn Load(&self) {
     }
 
-    pub fn CanPlayType(&self, _type: DOMString) -> DOMString {
+    fn CanPlayType(&self, _type: DOMString) -> DOMString {
         ~""
     }
 
-    pub fn ReadyState(&self) -> u16 {
+    fn ReadyState(&self) -> u16 {
         0
     }
 
-    pub fn Seeking(&self) -> bool {
+    fn Seeking(&self) -> bool {
         false
     }
 
-    pub fn CurrentTime(&self) -> f64 {
+    fn CurrentTime(&self) -> f64 {
         0f64
     }
 
-    pub fn SetCurrentTime(&mut self, _current_time: f64) -> ErrorResult {
+    fn SetCurrentTime(&mut self, _current_time: f64) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetDuration(&self) -> f64 {
+    fn GetDuration(&self) -> f64 {
         0f64
     }
 
-    pub fn Paused(&self) -> bool {
+    fn Paused(&self) -> bool {
         false
     }
 
-    pub fn DefaultPlaybackRate(&self) -> f64 {
+    fn DefaultPlaybackRate(&self) -> f64 {
         0f64
     }
 
-    pub fn SetDefaultPlaybackRate(&mut self, _default_playback_rate: f64) -> ErrorResult {
+    fn SetDefaultPlaybackRate(&mut self, _default_playback_rate: f64) -> ErrorResult {
         Ok(())
     }
 
-    pub fn PlaybackRate(&self) -> f64 {
+    fn PlaybackRate(&self) -> f64 {
         0f64
     }
 
-    pub fn SetPlaybackRate(&mut self, _playback_rate: f64) -> ErrorResult {
+    fn SetPlaybackRate(&mut self, _playback_rate: f64) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Ended(&self) -> bool {
+    fn Ended(&self) -> bool {
         false
     }
 
-    pub fn Autoplay(&self) -> bool {
+    fn Autoplay(&self) -> bool {
         false
     }
 
-    pub fn SetAutoplay(&mut self, _autoplay: bool) -> ErrorResult {
+    fn SetAutoplay(&mut self, _autoplay: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Loop(&self) -> bool {
+    fn Loop(&self) -> bool {
         false
     }
 
-    pub fn SetLoop(&mut self, _loop: bool) -> ErrorResult {
+    fn SetLoop(&mut self, _loop: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Play(&self) -> ErrorResult {
+    fn Play(&self) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Pause(&self) -> ErrorResult {
+    fn Pause(&self) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Controls(&self) -> bool {
+    fn Controls(&self) -> bool {
         false
     }
 
-    pub fn SetControls(&mut self, _controls: bool) -> ErrorResult {
+    fn SetControls(&mut self, _controls: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Volume(&self) -> f64 {
+    fn Volume(&self) -> f64 {
         0f64
     }
 
-    pub fn SetVolume(&mut self, _volume: f64) -> ErrorResult {
+    fn SetVolume(&mut self, _volume: f64) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Muted(&self) -> bool {
+    fn Muted(&self) -> bool {
         false
     }
 
-    pub fn SetMuted(&mut self, _muted: bool) {
+    fn SetMuted(&mut self, _muted: bool) {
     }
 
-    pub fn DefaultMuted(&self) -> bool {
+    fn DefaultMuted(&self) -> bool {
         false
     }
 
-    pub fn SetDefaultMuted(&mut self, _default_muted: bool) -> ErrorResult {
+    fn SetDefaultMuted(&mut self, _default_muted: bool) -> ErrorResult {
         Ok(())
     }
 }
-

src/components/script/dom/htmlmetaelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLMetaElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLMetaElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLMetaElementTypeId;
@@ -28,48 +28,59 @@ impl HTMLMetaElementDerived for EventTarget {
 }
 
 impl HTMLMetaElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLMetaElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLMetaElement {
         HTMLMetaElement {
             htmlelement: HTMLElement::new_inherited(HTMLMetaElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLMetaElement> {
-        let element = HTMLMetaElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLMetaElement> {
+        let element = HTMLMetaElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLMetaElementBinding::Wrap)
     }
 }
 
-impl HTMLMetaElement {
-    pub fn Name(&self) -> DOMString {
+pub trait HTMLMetaElementMethods {
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult;
+    fn HttpEquiv(&self) -> DOMString;
+    fn SetHttpEquiv(&mut self, _http_equiv: DOMString) -> ErrorResult;
+    fn Content(&self) -> DOMString;
+    fn SetContent(&mut self, _content: DOMString) -> ErrorResult;
+    fn Scheme(&self) -> DOMString;
+    fn SetScheme(&mut self, _scheme: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLMetaElementMethods for JSRef<'a, HTMLMetaElement> {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _name: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn HttpEquiv(&self) -> DOMString {
+    fn HttpEquiv(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetHttpEquiv(&mut self, _http_equiv: DOMString) -> ErrorResult {
+    fn SetHttpEquiv(&mut self, _http_equiv: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Content(&self) -> DOMString {
+    fn Content(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetContent(&mut self, _content: DOMString) -> ErrorResult {
+    fn SetContent(&mut self, _content: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Scheme(&self) -> DOMString {
+    fn Scheme(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetScheme(&mut self, _scheme: DOMString) -> ErrorResult {
+    fn SetScheme(&mut self, _scheme: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlmeterelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLMeterElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLMeterElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLMeterElementTypeId;
@@ -28,64 +28,80 @@ impl HTMLMeterElementDerived for EventTarget {
 }
 
 impl HTMLMeterElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLMeterElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLMeterElement {
         HTMLMeterElement {
             htmlelement: HTMLElement::new_inherited(HTMLMeterElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLMeterElement> {
-        let element = HTMLMeterElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLMeterElement> {
+        let element = HTMLMeterElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLMeterElementBinding::Wrap)
     }
 }
 
-impl HTMLMeterElement {
-    pub fn Value(&self) -> f64 {
+pub trait HTMLMeterElementMethods {
+    fn Value(&self) -> f64;
+    fn SetValue(&mut self, _value: f64) -> ErrorResult;
+    fn Min(&self) -> f64;
+    fn SetMin(&mut self, _min: f64) -> ErrorResult;
+    fn Max(&self) -> f64;
+    fn SetMax(&mut self, _max: f64) -> ErrorResult;
+    fn Low(&self) -> f64;
+    fn SetLow(&mut self, _low: f64) -> ErrorResult;
+    fn High(&self) -> f64;
+    fn SetHigh(&mut self, _high: f64) -> ErrorResult;
+    fn Optimum(&self) -> f64;
+    fn SetOptimum(&mut self, _optimum: f64) -> ErrorResult;
+}
+
+impl<'a> HTMLMeterElementMethods for JSRef<'a, HTMLMeterElement> {
+    fn Value(&self) -> f64 {
         0.0
     }
 
-    pub fn SetValue(&mut self, _value: f64) -> ErrorResult {
+    fn SetValue(&mut self, _value: f64) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Min(&self) -> f64 {
+    fn Min(&self) -> f64 {
         0.0
     }
 
-    pub fn SetMin(&mut self, _min: f64) -> ErrorResult {
+    fn SetMin(&mut self, _min: f64) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Max(&self) -> f64 {
+    fn Max(&self) -> f64 {
         0.0
     }
 
-    pub fn SetMax(&mut self, _max: f64) -> ErrorResult {
+    fn SetMax(&mut self, _max: f64) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Low(&self) -> f64 {
+    fn Low(&self) -> f64 {
         0.0
     }
 
-    pub fn SetLow(&mut self, _low: f64) -> ErrorResult {
+    fn SetLow(&mut self, _low: f64) -> ErrorResult {
         Ok(())
     }
 
-    pub fn High(&self) -> f64 {
+    fn High(&self) -> f64 {
         0.0
     }
 
-    pub fn SetHigh(&mut self, _high: f64) -> ErrorResult {
+    fn SetHigh(&mut self, _high: f64) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Optimum(&self) -> f64 {
+    fn Optimum(&self) -> f64 {
         0.0
     }
 
-    pub fn SetOptimum(&mut self, _optimum: f64) -> ErrorResult {
+    fn SetOptimum(&mut self, _optimum: f64) -> ErrorResult {
         Ok(())
     }
 }
+

src/components/script/dom/htmlmodelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLModElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLModElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLModElementTypeId;
@@ -28,32 +28,39 @@ impl HTMLModElementDerived for EventTarget {
 }
 
 impl HTMLModElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLModElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLModElement {
         HTMLModElement {
             htmlelement: HTMLElement::new_inherited(HTMLModElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLModElement> {
-        let element = HTMLModElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLModElement> {
+        let element = HTMLModElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLModElementBinding::Wrap)
     }
 }
 
-impl HTMLModElement {
-    pub fn Cite(&self) -> DOMString {
+pub trait HTMLModElementMethods {
+    fn Cite(&self) -> DOMString;
+    fn SetCite(&mut self, _cite: DOMString) -> ErrorResult;
+    fn DateTime(&self) -> DOMString;
+    fn SetDateTime(&mut self, _datetime: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLModElementMethods for JSRef<'a, HTMLModElement> {
+    fn Cite(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCite(&mut self, _cite: DOMString) -> ErrorResult {
+    fn SetCite(&mut self, _cite: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn DateTime(&self) -> DOMString {
+    fn DateTime(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetDateTime(&mut self, _datetime: DOMString) -> ErrorResult {
+    fn SetDateTime(&mut self, _datetime: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlobjectelement.rs

@@ -2,10 +2,11 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+use dom::attr::AttrMethods;
 use dom::bindings::codegen::BindingDeclarations::HTMLObjectElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLObjectElementDerived;
 use dom::bindings::codegen::InheritTypes::{ElementCast, HTMLElementCast};
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::{Element, HTMLObjectElementTypeId};
@@ -41,14 +42,14 @@ impl HTMLObjectElementDerived for EventTarget {
 }
 
 impl HTMLObjectElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLObjectElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLObjectElement {
         HTMLObjectElement {
             htmlelement: HTMLElement::new_inherited(HTMLObjectElementTypeId, localName, document),
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLObjectElement> {
-        let element = HTMLObjectElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLObjectElement> {
+        let element = HTMLObjectElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLObjectElementBinding::Wrap)
     }
 }
@@ -57,15 +58,15 @@ trait ProcessDataURL {
     fn process_data_url(&mut self, image_cache: ImageCacheTask, url: Option<Url>);
 }
 
-impl ProcessDataURL for JS<HTMLObjectElement> {
+impl<'a> ProcessDataURL for JSRef<'a, HTMLObjectElement> {
     // Makes the local `data` member match the status of the `data` attribute and starts
     /// prefetching the image. This method must be called after `data` is changed.
     fn process_data_url(&mut self, image_cache: ImageCacheTask, url: Option<Url>) {
-        let elem: JS<Element> = ElementCast::from(self);
+        let elem: &JSRef<Element> = ElementCast::from_ref(self);
 
         // TODO: support other values
-        match (elem.get_attribute(Null, "type").map(|x| x.get().Value()),
-               elem.get_attribute(Null, "data").map(|x| x.get().Value())) {
+        match (elem.get_attribute(Null, "type").map(|x| x.root().Value()),
+               elem.get_attribute(Null, "data").map(|x| x.root().Value())) {
             (None, Some(uri)) => {
                 if is_image_data(uri) {
                     let data_url = parse_url(uri, url);
@@ -78,177 +79,220 @@ impl ProcessDataURL for JS<HTMLObjectElement> {
     }
 }
 
-impl HTMLObjectElement {
-    pub fn Data(&self) -> DOMString {
+pub trait HTMLObjectElementMethods {
+    fn Data(&self) -> DOMString;
+    fn SetData(&mut self, _data: DOMString) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult;
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult;
+    fn UseMap(&self) -> DOMString;
+    fn SetUseMap(&mut self, _use_map: DOMString) -> ErrorResult;
+    fn GetForm(&self) -> Option<Temporary<HTMLFormElement>>;
+    fn Width(&self) -> DOMString;
+    fn SetWidth(&mut self, _width: DOMString) -> ErrorResult;
+    fn Height(&self) -> DOMString;
+    fn SetHeight(&mut self, _height: DOMString) -> ErrorResult;
+    fn GetContentDocument(&self) -> Option<Temporary<Document>>;
+    fn GetContentWindow(&self) -> Option<Temporary<Window>>;
+    fn WillValidate(&self) -> bool;
+    fn Validity(&self) -> Temporary<ValidityState>;
+    fn ValidationMessage(&self) -> DOMString;
+    fn CheckValidity(&self) -> bool;
+    fn SetCustomValidity(&mut self, _error: DOMString);
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult;
+    fn Archive(&self) -> DOMString;
+    fn SetArchive(&mut self, _archive: DOMString) -> ErrorResult;
+    fn Code(&self) -> DOMString;
+    fn SetCode(&mut self, _code: DOMString) -> ErrorResult;
+    fn Declare(&self) -> bool;
+    fn SetDeclare(&mut self, _declare: bool) -> ErrorResult;
+    fn Hspace(&self) -> u32;
+    fn SetHspace(&mut self, _hspace: u32) -> ErrorResult;
+    fn Standby(&self) -> DOMString;
+    fn SetStandby(&mut self, _standby: DOMString) -> ErrorResult;
+    fn Vspace(&self) -> u32;
+    fn SetVspace(&mut self, _vspace: u32) -> ErrorResult;
+    fn CodeBase(&self) -> DOMString;
+    fn SetCodeBase(&mut self, _codebase: DOMString) -> ErrorResult;
+    fn CodeType(&self) -> DOMString;
+    fn SetCodeType(&mut self, _codetype: DOMString) -> ErrorResult;
+    fn Border(&self) -> DOMString;
+    fn SetBorder(&mut self, _border: DOMString) -> ErrorResult;
+    fn GetSVGDocument(&self) -> Option<Temporary<Document>>;
+}
+
+impl<'a> HTMLObjectElementMethods for JSRef<'a, HTMLObjectElement> {
+    fn Data(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetData(&mut self, _data: DOMString) -> ErrorResult {
+    fn SetData(&mut self, _data: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetType(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Name(&self) -> DOMString {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _name: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn UseMap(&self) -> DOMString {
+    fn UseMap(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetUseMap(&mut self, _use_map: DOMString) -> ErrorResult {
+    fn SetUseMap(&mut self, _use_map: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetForm(&self) -> Option<JS<HTMLFormElement>> {
+    fn GetForm(&self) -> Option<Temporary<HTMLFormElement>> {
         None
     }
 
-    pub fn Width(&self) -> DOMString {
+    fn Width(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetWidth(&mut self, _width: DOMString) -> ErrorResult {
+    fn SetWidth(&mut self, _width: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Height(&self) -> DOMString {
+    fn Height(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetHeight(&mut self, _height: DOMString) -> ErrorResult {
+    fn SetHeight(&mut self, _height: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetContentDocument(&self) -> Option<JS<Document>> {
+    fn GetContentDocument(&self) -> Option<Temporary<Document>> {
         None
     }
 
-    pub fn GetContentWindow(&self) -> Option<JS<Window>> {
+    fn GetContentWindow(&self) -> Option<Temporary<Window>> {
         None
     }
 
-    pub fn WillValidate(&self) -> bool {
+    fn WillValidate(&self) -> bool {
         false
     }
 
-    pub fn Validity(&self) -> JS<ValidityState> {
-        let doc = self.htmlelement.element.node.owner_doc();
-        let doc = doc.get();
-        ValidityState::new(&doc.window)
+    fn Validity(&self) -> Temporary<ValidityState> {
+        let window = window_from_node(self).root();
+        ValidityState::new(&*window)
     }
 
-    pub fn ValidationMessage(&self) -> DOMString {
+    fn ValidationMessage(&self) -> DOMString {
         ~""
     }
 
-    pub fn CheckValidity(&self) -> bool {
+    fn CheckValidity(&self) -> bool {
         false
     }
 
-    pub fn SetCustomValidity(&mut self, _error: DOMString) {
+    fn SetCustomValidity(&mut self, _error: DOMString) {
     }
 
-    pub fn Align(&self) -> DOMString {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Archive(&self) -> DOMString {
+    fn Archive(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetArchive(&mut self, _archive: DOMString) -> ErrorResult {
+    fn SetArchive(&mut self, _archive: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Code(&self) -> DOMString {
+    fn Code(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCode(&mut self, _code: DOMString) -> ErrorResult {
+    fn SetCode(&mut self, _code: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Declare(&self) -> bool {
+    fn Declare(&self) -> bool {
         false
     }
 
-    pub fn SetDeclare(&mut self, _declare: bool) -> ErrorResult {
+    fn SetDeclare(&mut self, _declare: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Hspace(&self) -> u32 {
+    fn Hspace(&self) -> u32 {
         0
     }
 
-    pub fn SetHspace(&mut self, _hspace: u32) -> ErrorResult {
+    fn SetHspace(&mut self, _hspace: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Standby(&self) -> DOMString {
+    fn Standby(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetStandby(&mut self, _standby: DOMString) -> ErrorResult {
+    fn SetStandby(&mut self, _standby: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Vspace(&self) -> u32 {
+    fn Vspace(&self) -> u32 {
         0
     }
 
-    pub fn SetVspace(&mut self, _vspace: u32) -> ErrorResult {
+    fn SetVspace(&mut self, _vspace: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn CodeBase(&self) -> DOMString {
+    fn CodeBase(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCodeBase(&mut self, _codebase: DOMString) -> ErrorResult {
+    fn SetCodeBase(&mut self, _codebase: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn CodeType(&self) -> DOMString {
+    fn CodeType(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCodeType(&mut self, _codetype: DOMString) -> ErrorResult {
+    fn SetCodeType(&mut self, _codetype: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Border(&self) -> DOMString {
+    fn Border(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetBorder(&mut self, _border: DOMString) -> ErrorResult {
+    fn SetBorder(&mut self, _border: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetSVGDocument(&self) -> Option<JS<Document>> {
+    fn GetSVGDocument(&self) -> Option<Temporary<Document>> {
         None
     }
 }
 
-impl VirtualMethods for JS<HTMLObjectElement> {
-    fn super_type(&self) -> Option<~VirtualMethods:> {
-        let htmlelement: JS<HTMLElement> = HTMLElementCast::from(self);
-        Some(~htmlelement as ~VirtualMethods:)
+impl<'a> VirtualMethods for JSRef<'a, HTMLObjectElement> {
+    fn super_type<'a>(&'a mut self) -> Option<&'a mut VirtualMethods:> {
+        let htmlelement: &mut JSRef<HTMLElement> = HTMLElementCast::from_mut_ref(self);
+        Some(htmlelement as &mut VirtualMethods:)
     }
 
     fn after_set_attr(&mut self, name: DOMString, value: DOMString) {
@@ -258,9 +302,9 @@ impl VirtualMethods for JS<HTMLObjectElement> {
         }
 
         if "data" == name {
-            let window = window_from_node(self);
-            let url = Some(window.get().get_url());
-            self.process_data_url(window.get().image_cache_task.clone(), url);
+            let window = window_from_node(self).root();
+            let url = Some(window.deref().get_url());
+            self.process_data_url(window.deref().image_cache_task.clone(), url);
         }
     }
 }

src/components/script/dom/htmlolistelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLOListElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLOListElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLOListElementTypeId;
@@ -28,48 +28,59 @@ impl HTMLOListElementDerived for EventTarget {
 }
 
 impl HTMLOListElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLOListElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLOListElement {
         HTMLOListElement {
             htmlelement: HTMLElement::new_inherited(HTMLOListElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLOListElement> {
-        let element = HTMLOListElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLOListElement> {
+        let element = HTMLOListElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLOListElementBinding::Wrap)
     }
 }
 
-impl HTMLOListElement {
-    pub fn Reversed(&self) -> bool {
+pub trait HTMLOListElementMethods {
+    fn Reversed(&self) -> bool;
+    fn SetReversed(&self, _reversed: bool) -> ErrorResult;
+    fn Start(&self) -> i32;
+    fn SetStart(&mut self, _start: i32) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult;
+    fn Compact(&self) -> bool;
+    fn SetCompact(&self, _compact: bool) -> ErrorResult;
+}
+
+impl<'a> HTMLOListElementMethods for JSRef<'a, HTMLOListElement> {
+    fn Reversed(&self) -> bool {
         false
     }
 
-    pub fn SetReversed(&self, _reversed: bool) -> ErrorResult {
+    fn SetReversed(&self, _reversed: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Start(&self) -> i32 {
+    fn Start(&self) -> i32 {
         0
     }
 
-    pub fn SetStart(&mut self, _start: i32) -> ErrorResult {
+    fn SetStart(&mut self, _start: i32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetType(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Compact(&self) -> bool {
+    fn Compact(&self) -> bool {
         false
     }
 
-    pub fn SetCompact(&self, _compact: bool) -> ErrorResult {
+    fn SetCompact(&self, _compact: bool) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmloptgroupelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLOptGroupElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLOptGroupElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLOptGroupElementTypeId;
@@ -28,32 +28,39 @@ impl HTMLOptGroupElementDerived for EventTarget {
 }
 
 impl HTMLOptGroupElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLOptGroupElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLOptGroupElement {
         HTMLOptGroupElement {
             htmlelement: HTMLElement::new_inherited(HTMLOptGroupElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLOptGroupElement> {
-        let element = HTMLOptGroupElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLOptGroupElement> {
+        let element = HTMLOptGroupElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLOptGroupElementBinding::Wrap)
     }
 }
 
-impl HTMLOptGroupElement {
-    pub fn Disabled(&self) -> bool {
+pub trait HTMLOptGroupElementMethods {
+    fn Disabled(&self) -> bool;
+    fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult;
+    fn Label(&self) -> DOMString;
+    fn SetLabel(&mut self, _label: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLOptGroupElementMethods for JSRef<'a, HTMLOptGroupElement> {
+    fn Disabled(&self) -> bool {
         false
     }
 
-    pub fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult {
+    fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Label(&self) -> DOMString {
+    fn Label(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetLabel(&mut self, _label: DOMString) -> ErrorResult {
+    fn SetLabel(&mut self, _label: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmloptionelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLOptionElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLOptionElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLOptionElementTypeId;
@@ -29,72 +29,89 @@ impl HTMLOptionElementDerived for EventTarget {
 }
 
 impl HTMLOptionElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLOptionElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLOptionElement {
         HTMLOptionElement {
             htmlelement: HTMLElement::new_inherited(HTMLOptionElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLOptionElement> {
-        let element = HTMLOptionElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLOptionElement> {
+        let element = HTMLOptionElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLOptionElementBinding::Wrap)
     }
 }
 
-impl HTMLOptionElement {
-    pub fn Disabled(&self) -> bool {
+pub trait HTMLOptionElementMethods {
+    fn Disabled(&self) -> bool;
+    fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult;
+    fn GetForm(&self) -> Option<Temporary<HTMLFormElement>>;
+    fn Label(&self) -> DOMString;
+    fn SetLabel(&mut self, _label: DOMString) -> ErrorResult;
+    fn DefaultSelected(&self) -> bool;
+    fn SetDefaultSelected(&mut self, _default_selected: bool) -> ErrorResult;
+    fn Selected(&self) -> bool;
+    fn SetSelected(&mut self, _selected: bool) -> ErrorResult;
+    fn Value(&self) -> DOMString;
+    fn SetValue(&mut self, _value: DOMString) -> ErrorResult;
+    fn Text(&self) -> DOMString;
+    fn SetText(&mut self, _text: DOMString) -> ErrorResult;
+    fn Index(&self) -> i32;
+}
+
+impl<'a> HTMLOptionElementMethods for JSRef<'a, HTMLOptionElement> {
+    fn Disabled(&self) -> bool {
         false
     }
 
-    pub fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult {
+    fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetForm(&self) -> Option<JS<HTMLFormElement>> {
+    fn GetForm(&self) -> Option<Temporary<HTMLFormElement>> {
         None
     }
 
-    pub fn Label(&self) -> DOMString {
+    fn Label(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetLabel(&mut self, _label: DOMString) -> ErrorResult {
+    fn SetLabel(&mut self, _label: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn DefaultSelected(&self) -> bool {
+    fn DefaultSelected(&self) -> bool {
         false
     }
 
-    pub fn SetDefaultSelected(&mut self, _default_selected: bool) -> ErrorResult {
+    fn SetDefaultSelected(&mut self, _default_selected: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Selected(&self) -> bool {
+    fn Selected(&self) -> bool {
         false
     }
 
-    pub fn SetSelected(&mut self, _selected: bool) -> ErrorResult {
+    fn SetSelected(&mut self, _selected: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Value(&self) -> DOMString {
+    fn Value(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetValue(&mut self, _value: DOMString) -> ErrorResult {
+    fn SetValue(&mut self, _value: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Text(&self) -> DOMString {
+    fn Text(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetText(&mut self, _text: DOMString) -> ErrorResult {
+    fn SetText(&mut self, _text: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Index(&self) -> i32 {
+    fn Index(&self) -> i32 {
         0
     }
 }

src/components/script/dom/htmloutputelement.rs

@@ -4,14 +4,14 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLOutputElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLOutputElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLOutputElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
 use dom::htmlelement::HTMLElement;
 use dom::htmlformelement::HTMLFormElement;
-use dom::node::{Node, ElementNodeTypeId};
+use dom::node::{Node, ElementNodeTypeId, window_from_node};
 use dom::validitystate::ValidityState;
 use servo_util::str::DOMString;
 
@@ -30,79 +30,93 @@ impl HTMLOutputElementDerived for EventTarget {
 }
 
 impl HTMLOutputElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLOutputElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLOutputElement {
         HTMLOutputElement {
             htmlelement: HTMLElement::new_inherited(HTMLOutputElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLOutputElement> {
-        let element = HTMLOutputElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLOutputElement> {
+        let element = HTMLOutputElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLOutputElementBinding::Wrap)
     }
 }
 
-impl HTMLOutputElement {
-    pub fn GetForm(&self) -> Option<JS<HTMLFormElement>> {
+pub trait HTMLOutputElementMethods {
+    fn GetForm(&self) -> Option<Temporary<HTMLFormElement>>;
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn DefaultValue(&self) -> DOMString;
+    fn SetDefaultValue(&mut self, _value: DOMString) -> ErrorResult;
+    fn Value(&self) -> DOMString;
+    fn SetValue(&mut self, _value: DOMString) -> ErrorResult;
+    fn WillValidate(&self) -> bool;
+    fn SetWillValidate(&mut self, _will_validate: bool);
+    fn Validity(&self) -> Temporary<ValidityState>;
+    fn ValidationMessage(&self) -> DOMString;
+    fn SetValidationMessage(&mut self, _message: DOMString) -> ErrorResult;
+    fn CheckValidity(&self) -> bool;
+    fn SetCustomValidity(&mut self, _error: DOMString);
+}
+
+impl<'a> HTMLOutputElementMethods for JSRef<'a, HTMLOutputElement> {
+    fn GetForm(&self) -> Option<Temporary<HTMLFormElement>> {
         None
     }
 
-    pub fn Name(&self) -> DOMString {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _name: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn DefaultValue(&self) -> DOMString {
+    fn DefaultValue(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetDefaultValue(&mut self, _value: DOMString) -> ErrorResult {
+    fn SetDefaultValue(&mut self, _value: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Value(&self) -> DOMString {
+    fn Value(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetValue(&mut self, _value: DOMString) -> ErrorResult {
+    fn SetValue(&mut self, _value: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn WillValidate(&self) -> bool {
+    fn WillValidate(&self) -> bool {
         false
     }
 
-    pub fn SetWillValidate(&mut self, _will_validate: bool) {
+    fn SetWillValidate(&mut self, _will_validate: bool) {
     }
 
-    pub fn Validity(&self) -> JS<ValidityState> {
-        let doc = self.htmlelement.element.node.owner_doc();
-        let doc = doc.get();
-        ValidityState::new(&doc.window)
+    fn Validity(&self) -> Temporary<ValidityState> {
+        let window = window_from_node(self).root();
+        ValidityState::new(&*window)
     }
 
-    pub fn SetValidity(&mut self, _validity: JS<ValidityState>) {
-    }
-
-    pub fn ValidationMessage(&self) -> DOMString {
+    fn ValidationMessage(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetValidationMessage(&mut self, _message: DOMString) -> ErrorResult {
+    fn SetValidationMessage(&mut self, _message: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn CheckValidity(&self) -> bool {
+    fn CheckValidity(&self) -> bool {
         true
     }
 
-    pub fn SetCustomValidity(&mut self, _error: DOMString) {
+    fn SetCustomValidity(&mut self, _error: DOMString) {
     }
 }

src/components/script/dom/htmlparagraphelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLParagraphElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLParagraphElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLParagraphElementTypeId;
@@ -28,24 +28,29 @@ impl HTMLParagraphElementDerived for EventTarget {
 }
 
 impl HTMLParagraphElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLParagraphElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLParagraphElement {
         HTMLParagraphElement {
             htmlelement: HTMLElement::new_inherited(HTMLParagraphElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLParagraphElement> {
-        let element = HTMLParagraphElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLParagraphElement> {
+        let element = HTMLParagraphElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLParagraphElementBinding::Wrap)
     }
 }
 
-impl HTMLParagraphElement {
-    pub fn Align(&self) -> DOMString {
+pub trait HTMLParagraphElementMethods {
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLParagraphElementMethods for JSRef<'a, HTMLParagraphElement> {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlparamelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLParamElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLParamElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLParamElementTypeId;
@@ -28,48 +28,59 @@ impl HTMLParamElementDerived for EventTarget {
 }
 
 impl HTMLParamElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLParamElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLParamElement {
         HTMLParamElement {
             htmlelement: HTMLElement::new_inherited(HTMLParamElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLParamElement> {
-        let element = HTMLParamElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLParamElement> {
+        let element = HTMLParamElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLParamElementBinding::Wrap)
     }
 }
 
-impl HTMLParamElement {
-    pub fn Name(&self) -> DOMString {
+pub trait HTMLParamElementMethods {
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult;
+    fn Value(&self) -> DOMString;
+    fn SetValue(&mut self, _value: DOMString) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult;
+    fn ValueType(&self) -> DOMString;
+    fn SetValueType(&mut self, _value_type: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLParamElementMethods for JSRef<'a, HTMLParamElement> {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _name: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Value(&self) -> DOMString {
+    fn Value(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetValue(&mut self, _value: DOMString) -> ErrorResult {
+    fn SetValue(&mut self, _value: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetType(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn ValueType(&self) -> DOMString {
+    fn ValueType(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetValueType(&mut self, _value_type: DOMString) -> ErrorResult {
+    fn SetValueType(&mut self, _value_type: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlpreelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLPreElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLPreElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLPreElementTypeId;
@@ -28,24 +28,29 @@ impl HTMLPreElementDerived for EventTarget {
 }
 
 impl HTMLPreElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLPreElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLPreElement {
         HTMLPreElement {
             htmlelement: HTMLElement::new_inherited(HTMLPreElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLPreElement> {
-        let element = HTMLPreElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLPreElement> {
+        let element = HTMLPreElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLPreElementBinding::Wrap)
     }
 }
 
-impl HTMLPreElement {
-    pub fn Width(&self) -> i32 {
+pub trait HTMLPreElementMethods {
+    fn Width(&self) -> i32;
+    fn SetWidth(&mut self, _width: i32) -> ErrorResult;
+}
+
+impl<'a> HTMLPreElementMethods for JSRef<'a, HTMLPreElement> {
+    fn Width(&self) -> i32 {
         0
     }
 
-    pub fn SetWidth(&mut self, _width: i32) -> ErrorResult {
+    fn SetWidth(&mut self, _width: i32) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlprogresselement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLProgressElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLProgressElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::{ErrorResult, Fallible};
 use dom::document::Document;
 use dom::element::HTMLProgressElementTypeId;
@@ -28,40 +28,49 @@ impl HTMLProgressElementDerived for EventTarget {
 }
 
 impl HTMLProgressElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLProgressElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLProgressElement {
         HTMLProgressElement {
             htmlelement: HTMLElement::new_inherited(HTMLProgressElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLProgressElement> {
-        let element = HTMLProgressElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLProgressElement> {
+        let element = HTMLProgressElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLProgressElementBinding::Wrap)
     }
 }
 
-impl HTMLProgressElement {
-    pub fn Value(&self) -> f64 {
+pub trait HTMLProgressElementMethods {
+    fn Value(&self) -> f64;
+    fn SetValue(&mut self, _value: f64) -> ErrorResult;
+    fn Max(&self) -> f64;
+    fn SetMax(&mut self, _max: f64) -> ErrorResult;
+    fn Position(&self) -> f64;
+    fn GetPositiom(&self) -> Fallible<f64>;
+}
+
+impl<'a> HTMLProgressElementMethods for JSRef<'a, HTMLProgressElement> {
+    fn Value(&self) -> f64 {
         0f64
     }
 
-    pub fn SetValue(&mut self, _value: f64) -> ErrorResult {
+    fn SetValue(&mut self, _value: f64) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Max(&self) -> f64 {
+    fn Max(&self) -> f64 {
         0f64
     }
 
-    pub fn SetMax(&mut self, _max: f64) -> ErrorResult {
+    fn SetMax(&mut self, _max: f64) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Position(&self) -> f64 {
+    fn Position(&self) -> f64 {
         0f64
     }
 
-    pub fn GetPositiom(&self) -> Fallible<f64> {
+    fn GetPositiom(&self) -> Fallible<f64> {
         Ok(0f64)
     }
 }

src/components/script/dom/htmlquoteelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLQuoteElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLQuoteElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLQuoteElementTypeId;
@@ -28,24 +28,29 @@ impl HTMLQuoteElementDerived for EventTarget {
 }
 
 impl HTMLQuoteElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLQuoteElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLQuoteElement {
         HTMLQuoteElement {
             htmlelement: HTMLElement::new_inherited(HTMLQuoteElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLQuoteElement> {
-        let element = HTMLQuoteElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLQuoteElement> {
+        let element = HTMLQuoteElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLQuoteElementBinding::Wrap)
     }
 }
 
-impl HTMLQuoteElement {
-    pub fn Cite(&self) -> DOMString {
+pub trait HTMLQuoteElementMethods {
+    fn Cite(&self) -> DOMString;
+    fn SetCite(&self, _cite: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLQuoteElementMethods for JSRef<'a, HTMLQuoteElement> {
+    fn Cite(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCite(&self, _cite: DOMString) -> ErrorResult {
+    fn SetCite(&self, _cite: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlscriptelement.rs

@@ -5,7 +5,7 @@
 use dom::bindings::codegen::BindingDeclarations::HTMLScriptElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLScriptElementDerived;
 use dom::bindings::codegen::InheritTypes::ElementCast;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::{HTMLScriptElementTypeId, Element, AttributeHandlers};
@@ -29,89 +29,110 @@ impl HTMLScriptElementDerived for EventTarget {
 }
 
 impl HTMLScriptElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLScriptElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLScriptElement {
         HTMLScriptElement {
             htmlelement: HTMLElement::new_inherited(HTMLScriptElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLScriptElement> {
-        let element = HTMLScriptElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLScriptElement> {
+        let element = HTMLScriptElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLScriptElementBinding::Wrap)
     }
 }
 
-impl HTMLScriptElement {
-    pub fn Src(&self, abstract_self: &JS<HTMLScriptElement>) -> DOMString {
-        let element: JS<Element> = ElementCast::from(abstract_self);
+pub trait HTMLScriptElementMethods {
+    fn Src(&self) -> DOMString;
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult;
+    fn Charset(&self) -> DOMString;
+    fn SetCharset(&mut self, _charset: DOMString) -> ErrorResult;
+    fn Async(&self) -> bool;
+    fn SetAsync(&self, _async: bool) -> ErrorResult;
+    fn Defer(&self) -> bool;
+    fn SetDefer(&self, _defer: bool) -> ErrorResult;
+    fn CrossOrigin(&self) -> DOMString;
+    fn SetCrossOrigin(&mut self, _cross_origin: DOMString) -> ErrorResult;
+    fn Text(&self) -> DOMString;
+    fn SetText(&mut self, _text: DOMString) -> ErrorResult;
+    fn Event(&self) -> DOMString;
+    fn SetEvent(&mut self, _event: DOMString) -> ErrorResult;
+    fn HtmlFor(&self) -> DOMString;
+    fn SetHtmlFor(&mut self, _html_for: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLScriptElementMethods for JSRef<'a, HTMLScriptElement> {
+    fn Src(&self) -> DOMString {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
         element.get_url_attribute("src")
     }
 
-    pub fn SetSrc(&mut self, _abstract_self: &JS<HTMLScriptElement>, _src: DOMString) -> ErrorResult {
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetType(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Charset(&self) -> DOMString {
+    fn Charset(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCharset(&mut self, _charset: DOMString) -> ErrorResult {
+    fn SetCharset(&mut self, _charset: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Async(&self) -> bool {
+    fn Async(&self) -> bool {
         false
     }
 
-    pub fn SetAsync(&self, _async: bool) -> ErrorResult {
+    fn SetAsync(&self, _async: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Defer(&self) -> bool {
+    fn Defer(&self) -> bool {
         false
     }
 
-    pub fn SetDefer(&self, _defer: bool) -> ErrorResult {
+    fn SetDefer(&self, _defer: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn CrossOrigin(&self) -> DOMString {
+    fn CrossOrigin(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCrossOrigin(&mut self, _cross_origin: DOMString) -> ErrorResult {
+    fn SetCrossOrigin(&mut self, _cross_origin: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Text(&self) -> DOMString {
+    fn Text(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetText(&mut self, _text: DOMString) -> ErrorResult {
+    fn SetText(&mut self, _text: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Event(&self) -> DOMString {
+    fn Event(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetEvent(&mut self, _event: DOMString) -> ErrorResult {
+    fn SetEvent(&mut self, _event: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn HtmlFor(&self) -> DOMString {
+    fn HtmlFor(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetHtmlFor(&mut self, _html_for: DOMString) -> ErrorResult {
+    fn SetHtmlFor(&mut self, _html_for: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlselectelement.rs

@@ -5,14 +5,14 @@
 use dom::bindings::codegen::BindingDeclarations::HTMLSelectElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLSelectElementDerived;
 use dom::bindings::codegen::UnionTypes::{HTMLElementOrLong, HTMLOptionElementOrHTMLOptGroupElement};
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::{Element, HTMLSelectElementTypeId};
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
 use dom::htmlelement::HTMLElement;
 use dom::htmlformelement::HTMLFormElement;
-use dom::node::{Node, ElementNodeTypeId};
+use dom::node::{Node, ElementNodeTypeId, window_from_node};
 use dom::htmloptionelement::HTMLOptionElement;
 use dom::validitystate::ValidityState;
 use servo_util::str::DOMString;
@@ -32,152 +32,185 @@ impl HTMLSelectElementDerived for EventTarget {
 }
 
 impl HTMLSelectElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLSelectElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLSelectElement {
         HTMLSelectElement {
             htmlelement: HTMLElement::new_inherited(HTMLSelectElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLSelectElement> {
-        let element = HTMLSelectElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLSelectElement> {
+        let element = HTMLSelectElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLSelectElementBinding::Wrap)
     }
 }
 
-impl HTMLSelectElement {
-    pub fn Autofocus(&self) -> bool {
+pub trait HTMLSelectElementMethods {
+    fn Autofocus(&self) -> bool;
+    fn SetAutofocus(&mut self, _autofocus: bool) -> ErrorResult;
+    fn Disabled(&self) -> bool;
+    fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult;
+    fn GetForm(&self) -> Option<Temporary<HTMLFormElement>>;
+    fn Multiple(&self) -> bool;
+    fn SetMultiple(&mut self, _multiple: bool) -> ErrorResult;
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult;
+    fn Required(&self) -> bool;
+    fn SetRequired(&mut self, _multiple: bool) -> ErrorResult;
+    fn Size(&self) -> u32;
+    fn SetSize(&mut self, _size: u32) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn Length(&self) -> u32;
+    fn SetLength(&mut self, _length: u32) -> ErrorResult;
+    fn Item(&self, _index: u32) -> Option<Temporary<Element>>;
+    fn NamedItem(&self, _name: DOMString) -> Option<Temporary<HTMLOptionElement>>;
+    fn IndexedGetter(&self, _index: u32, _found: &mut bool) -> Option<Temporary<Element>>;
+    fn IndexedSetter(&mut self, _index: u32, _option: Option<JSRef<HTMLOptionElement>>) -> ErrorResult;
+    fn Remove_(&self);
+    fn Remove(&self, _index: i32);
+    fn SelectedIndex(&self) -> i32;
+    fn SetSelectedIndex(&mut self, _index: i32) -> ErrorResult;
+    fn Value(&self) -> DOMString;
+    fn SetValue(&mut self, _value: DOMString);
+    fn WillValidate(&self) -> bool;
+    fn SetWillValidate(&mut self, _will_validate: bool);
+    fn Validity(&self) -> Temporary<ValidityState>;
+    fn ValidationMessage(&self) -> DOMString;
+    fn SetValidationMessage(&mut self, _message: DOMString) -> ErrorResult;
+    fn CheckValidity(&self) -> bool;
+    fn SetCustomValidity(&mut self, _error: DOMString);
+    fn Add(&self, _element: HTMLOptionElementOrHTMLOptGroupElement, _before: Option<HTMLElementOrLong>) -> ErrorResult;
+}
+
+impl<'a> HTMLSelectElementMethods for JSRef<'a, HTMLSelectElement> {
+    fn Autofocus(&self) -> bool {
         false
     }
 
-    pub fn SetAutofocus(&mut self, _autofocus: bool) -> ErrorResult {
+    fn SetAutofocus(&mut self, _autofocus: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Disabled(&self) -> bool {
+    fn Disabled(&self) -> bool {
         false
     }
 
-    pub fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult {
+    fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetForm(&self) -> Option<JS<HTMLFormElement>> {
+    fn GetForm(&self) -> Option<Temporary<HTMLFormElement>> {
         None
     }
 
-    pub fn Multiple(&self) -> bool {
+    fn Multiple(&self) -> bool {
         false
     }
 
-    pub fn SetMultiple(&mut self, _multiple: bool) -> ErrorResult {
+    fn SetMultiple(&mut self, _multiple: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Name(&self) -> DOMString {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _name: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Required(&self) -> bool {
+    fn Required(&self) -> bool {
         false
     }
 
-    pub fn SetRequired(&mut self, _multiple: bool) -> ErrorResult {
+    fn SetRequired(&mut self, _multiple: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Size(&self) -> u32 {
+    fn Size(&self) -> u32 {
         0
     }
 
-    pub fn SetSize(&mut self, _size: u32) -> ErrorResult {
+    fn SetSize(&mut self, _size: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn Length(&self) -> u32 {
+    fn Length(&self) -> u32 {
         0
     }
 
-    pub fn SetLength(&mut self, _length: u32) -> ErrorResult {
+    fn SetLength(&mut self, _length: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Item(&self, _index: u32) -> Option<JS<Element>> {
+    fn Item(&self, _index: u32) -> Option<Temporary<Element>> {
         None
     }
 
-    pub fn NamedItem(&self, _name: DOMString) -> Option<JS<HTMLOptionElement>> {
+    fn NamedItem(&self, _name: DOMString) -> Option<Temporary<HTMLOptionElement>> {
         None
     }
 
-    pub fn IndexedGetter(&self, _index: u32, _found: &mut bool) -> Option<JS<Element>> {
+    fn IndexedGetter(&self, _index: u32, _found: &mut bool) -> Option<Temporary<Element>> {
         None
     }
 
-    pub fn IndexedSetter(&mut self, _index: u32, _option: Option<JS<HTMLOptionElement>>) -> ErrorResult {
+    fn IndexedSetter(&mut self, _index: u32, _option: Option<JSRef<HTMLOptionElement>>) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Remove_(&self) {
+    fn Remove_(&self) {
     }
 
-    pub fn Remove(&self, _index: i32) {
+    fn Remove(&self, _index: i32) {
     }
 
-    pub fn SelectedIndex(&self) -> i32 {
+    fn SelectedIndex(&self) -> i32 {
         0
     }
 
-    pub fn SetSelectedIndex(&mut self, _index: i32) -> ErrorResult {
+    fn SetSelectedIndex(&mut self, _index: i32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Value(&self) -> DOMString {
+    fn Value(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetValue(&mut self, _value: DOMString) {
+    fn SetValue(&mut self, _value: DOMString) {
     }
 
-    pub fn WillValidate(&self) -> bool {
+    fn WillValidate(&self) -> bool {
         false
     }
 
-    pub fn SetWillValidate(&mut self, _will_validate: bool) {
+    fn SetWillValidate(&mut self, _will_validate: bool) {
     }
 
-    pub fn Validity(&self) -> JS<ValidityState> {
-        let doc = self.htmlelement.element.node.owner_doc();
-        let doc = doc.get();
-        ValidityState::new(&doc.window)
+    fn Validity(&self) -> Temporary<ValidityState> {
+        let window = window_from_node(self).root();
+        ValidityState::new(&*window)
     }
 
-    pub fn SetValidity(&mut self, _validity: JS<ValidityState>) {
-    }
-
-    pub fn ValidationMessage(&self) -> DOMString {
+    fn ValidationMessage(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetValidationMessage(&mut self, _message: DOMString) -> ErrorResult {
+    fn SetValidationMessage(&mut self, _message: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn CheckValidity(&self) -> bool {
+    fn CheckValidity(&self) -> bool {
         true
     }
 
-    pub fn SetCustomValidity(&mut self, _error: DOMString) {
+    fn SetCustomValidity(&mut self, _error: DOMString) {
     }
 
-    pub fn Add(&self, _element: HTMLOptionElementOrHTMLOptGroupElement, _before: Option<HTMLElementOrLong>) -> ErrorResult {
+    fn Add(&self, _element: HTMLOptionElementOrHTMLOptGroupElement, _before: Option<HTMLElementOrLong>) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlserializer.rs

@@ -4,15 +4,15 @@
 
 use servo_util::namespace;
 use dom::attr::Attr;
-use dom::bindings::codegen::InheritTypes::{ElementCast, TextCast, CommentCast};
+use dom::bindings::codegen::InheritTypes::{ElementCast, TextCast, CommentCast, NodeCast};
 use dom::bindings::codegen::InheritTypes::{DocumentTypeCast, CharacterDataCast};
 use dom::bindings::codegen::InheritTypes::ProcessingInstructionCast;
-use dom::bindings::js::JS;
+use dom::bindings::js::JSRef;
 use dom::characterdata::CharacterData;
 use dom::comment::Comment;
 use dom::documenttype::DocumentType;
 use dom::element::Element;
-use dom::node::NodeIterator;
+use dom::node::{Node, NodeIterator};
 use dom::node::{DoctypeNodeTypeId, DocumentFragmentNodeTypeId, CommentNodeTypeId};
 use dom::node::{DocumentNodeTypeId, ElementNodeTypeId, ProcessingInstructionNodeTypeId};
 use dom::node::{TextNodeTypeId, NodeHelpers};
@@ -30,24 +30,25 @@ pub fn serialize(iterator: &mut NodeIterator) -> ~str {
         html.push_str(
             match node.type_id() {
                 ElementNodeTypeId(..) => {
-                    let elem: JS<Element> = ElementCast::to(&node).unwrap();
-                    serialize_elem(&elem, &mut open_elements)
+                    let elem: &JSRef<Element> = ElementCast::to_ref(&node).unwrap();
+                    serialize_elem(elem, &mut open_elements)
                 }
                 CommentNodeTypeId => {
-                    let comment: JS<Comment> = CommentCast::to(&node).unwrap();
-                    serialize_comment(&comment)
+                    let comment: &JSRef<Comment> = CommentCast::to_ref(&node).unwrap();
+                    serialize_comment(comment)
                 }
                 TextNodeTypeId => {
-                    let text: JS<Text> = TextCast::to(&node).unwrap();
-                    serialize_text(&text)
+                    let text: &JSRef<Text> = TextCast::to_ref(&node).unwrap();
+                    serialize_text(text)
                 }
                 DoctypeNodeTypeId => {
-                    let doctype: JS<DocumentType> = DocumentTypeCast::to(&node).unwrap();
-                    serialize_doctype(&doctype)
+                    let doctype: &JSRef<DocumentType> = DocumentTypeCast::to_ref(&node).unwrap();
+                    serialize_doctype(doctype)
                 }
                 ProcessingInstructionNodeTypeId => {
-                    let processing_instruction: JS<ProcessingInstruction> = ProcessingInstructionCast::to(&node).unwrap();
-                    serialize_processing_instruction(&processing_instruction)
+                    let processing_instruction: &JSRef<ProcessingInstruction> =
+                        ProcessingInstructionCast::to_ref(&node).unwrap();
+                    serialize_processing_instruction(processing_instruction)
                 }
                 DocumentFragmentNodeTypeId => {
                     ~""
@@ -64,47 +65,50 @@ pub fn serialize(iterator: &mut NodeIterator) -> ~str {
     html
 }
 
-fn serialize_comment(comment: &JS<Comment>) -> ~str {
-    ~"<!--" + comment.get().characterdata.data + "-->"
+fn serialize_comment(comment: &JSRef<Comment>) -> ~str {
+    ~"<!--" + comment.deref().characterdata.data + "-->"
 }
 
-fn serialize_text(text: &JS<Text>) -> ~str {
-    match text.get().characterdata.node.parent_node {
+fn serialize_text(text: &JSRef<Text>) -> ~str {
+    let text_node: &JSRef<Node> = NodeCast::from_ref(text);
+    match text_node.parent_node().map(|node| node.root()) {
         Some(ref parent) if parent.is_element() => {
-            let elem: JS<Element> = ElementCast::to(parent).unwrap();
-            match elem.get().local_name.as_slice() {
+            let elem: &JSRef<Element> = ElementCast::to_ref(&**parent).unwrap();
+            match elem.deref().local_name.as_slice() {
                 "style" | "script" | "xmp" | "iframe" |
                 "noembed" | "noframes" | "plaintext" |
-                "noscript" if elem.get().namespace == namespace::HTML => {
-                    text.get().characterdata.data.clone()
+                "noscript" if elem.deref().namespace == namespace::HTML => {
+                    text.deref().characterdata.data.clone()
                 },
-                _ => escape(text.get().characterdata.data, false)
+                _ => escape(text.deref().characterdata.data, false)
             }
         }
-        _ => escape(text.get().characterdata.data, false)
+        _ => escape(text.deref().characterdata.data, false)
     }
 }
 
-fn serialize_processing_instruction(processing_instruction: &JS<ProcessingInstruction>) -> ~str {
-    ~"<?" + processing_instruction.get().target + " " + processing_instruction.get().characterdata.data + "?>"
+fn serialize_processing_instruction(processing_instruction: &JSRef<ProcessingInstruction>) -> ~str {
+    ~"<?" + processing_instruction.deref().target + " " + processing_instruction.deref().characterdata.data + "?>"
 }
 
-fn serialize_doctype(doctype: &JS<DocumentType>) -> ~str {
-    ~"<!DOCTYPE" + doctype.get().name + ">"
+fn serialize_doctype(doctype: &JSRef<DocumentType>) -> ~str {
+    ~"<!DOCTYPE" + doctype.deref().name + ">"
 }
 
-fn serialize_elem(elem: &JS<Element>, open_elements: &mut Vec<~str>) -> ~str {
-    let mut rv = ~"<" + elem.get().local_name;
-    for attr in elem.get().attrs.iter() {
-        rv.push_str(serialize_attr(attr));
+fn serialize_elem(elem: &JSRef<Element>, open_elements: &mut Vec<~str>) -> ~str {
+    let mut rv = ~"<" + elem.deref().local_name;
+    for attr in elem.deref().attrs.iter() {
+        let attr = attr.root();
+        rv.push_str(serialize_attr(&*attr));
     };
     rv.push_str(">");
-    match elem.get().local_name.as_slice() {
-        "pre" | "listing" | "textarea" if elem.get().namespace == namespace::HTML => {
-            match elem.get().node.first_child {
+    match elem.deref().local_name.as_slice() {
+        "pre" | "listing" | "textarea" if elem.deref().namespace == namespace::HTML => {
+            let node: &JSRef<Node> = NodeCast::from_ref(elem);
+            match node.first_child().map(|child| child.root()) {
                 Some(ref child) if child.is_text() => {
-                    let text: JS<CharacterData> = CharacterDataCast::to(child).unwrap();
-                    if text.get().data.len() > 0 && text.get().data[0] == 0x0A as u8 {
+                    let text: &JSRef<CharacterData> = CharacterDataCast::to_ref(&**child).unwrap();
+                    if text.deref().data.len() > 0 && text.deref().data[0] == 0x0A as u8 {
                         rv.push_str("\x0A");
                     }
                 },
@@ -113,26 +117,26 @@ fn serialize_elem(elem: &JS<Element>, open_elements: &mut Vec<~str>) -> ~str {
         },
         _ => {}
     }
-    if !elem.get().is_void() {
-        open_elements.push(elem.get().local_name.clone());
+    if !elem.deref().is_void() {
+        open_elements.push(elem.deref().local_name.clone());
     }
     rv
 }
 
-fn serialize_attr(attr: &JS<Attr>) -> ~str {
-    let attr_name = if attr.get().namespace == namespace::XML {
-        ~"xml:" + attr.get().local_name.clone()
-    } else if attr.get().namespace == namespace::XMLNS &&
-        attr.get().local_name.as_slice() == "xmlns" {
+fn serialize_attr(attr: &JSRef<Attr>) -> ~str {
+    let attr_name = if attr.deref().namespace == namespace::XML {
+        ~"xml:" + attr.deref().local_name.clone()
+    } else if attr.deref().namespace == namespace::XMLNS &&
+        attr.deref().local_name.as_slice() == "xmlns" {
         ~"xmlns"
-    } else if attr.get().namespace == namespace::XMLNS {
-        ~"xmlns:" + attr.get().local_name.clone()
-    } else if attr.get().namespace == namespace::XLink {
-        ~"xlink:" + attr.get().local_name.clone()
+    } else if attr.deref().namespace == namespace::XMLNS {
+        ~"xmlns:" + attr.deref().local_name.clone()
+    } else if attr.deref().namespace == namespace::XLink {
+        ~"xlink:" + attr.deref().local_name.clone()
     } else {
-        attr.get().name.clone()
+        attr.deref().name.clone()
     };
-    ~" " + attr_name + "=\"" + escape(attr.get().value, true) + "\""
+    ~" " + attr_name + "=\"" + escape(attr.deref().value, true) + "\""
 }
 
 fn escape(string: &str, attr_mode: bool) -> ~str {

src/components/script/dom/htmlsourceelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLSourceElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLSourceElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLSourceElementTypeId;
@@ -28,40 +28,49 @@ impl HTMLSourceElementDerived for EventTarget {
 }
 
 impl HTMLSourceElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLSourceElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLSourceElement {
         HTMLSourceElement {
             htmlelement: HTMLElement::new_inherited(HTMLSourceElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLSourceElement> {
-        let element = HTMLSourceElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLSourceElement> {
+        let element = HTMLSourceElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLSourceElementBinding::Wrap)
     }
 }
 
-impl HTMLSourceElement {
-    pub fn Src(&self) -> DOMString {
+pub trait HTMLSourceElementMethods {
+    fn Src(&self) -> DOMString;
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult;
+    fn Media(&self) -> DOMString;
+    fn SetMedia(&mut self, _media: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLSourceElementMethods for JSRef<'a, HTMLSourceElement> {
+    fn Src(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetSrc(&mut self, _src: DOMString) -> ErrorResult {
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetType(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Media(&self) -> DOMString {
+    fn Media(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetMedia(&mut self, _media: DOMString) -> ErrorResult {
+    fn SetMedia(&mut self, _media: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlspanelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLSpanElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLSpanElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::element::HTMLSpanElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
@@ -27,14 +27,17 @@ impl HTMLSpanElementDerived for EventTarget {
 }
 
 impl HTMLSpanElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLSpanElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLSpanElement {
         HTMLSpanElement {
             htmlelement: HTMLElement::new_inherited(HTMLSpanElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLSpanElement> {
-        let element = HTMLSpanElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLSpanElement> {
+        let element = HTMLSpanElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLSpanElementBinding::Wrap)
     }
 }
+
+pub trait HTMLSpanElementMethods {
+}

src/components/script/dom/htmlstyleelement.rs

@@ -4,13 +4,13 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLStyleElementBinding;
 use dom::bindings::codegen::InheritTypes::{HTMLElementCast, HTMLStyleElementDerived, NodeCast};
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLStyleElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
 use dom::htmlelement::HTMLElement;
-use dom::node::{Node, ElementNodeTypeId, window_from_node};
+use dom::node::{Node, NodeMethods, ElementNodeTypeId, window_from_node};
 use dom::virtualmethods::VirtualMethods;
 use html::cssparse::parse_inline_css;
 use layout_interface::{AddStylesheetMsg, LayoutChan};
@@ -31,47 +31,58 @@ impl HTMLStyleElementDerived for EventTarget {
 }
 
 impl HTMLStyleElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLStyleElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLStyleElement {
         HTMLStyleElement {
             htmlelement: HTMLElement::new_inherited(HTMLStyleElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLStyleElement> {
-        let element = HTMLStyleElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLStyleElement> {
+        let element = HTMLStyleElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLStyleElementBinding::Wrap)
     }
 }
 
-impl HTMLStyleElement {
-    pub fn Disabled(&self) -> bool {
+pub trait HTMLStyleElementMethods {
+    fn Disabled(&self) -> bool;
+    fn SetDisabled(&self, _disabled: bool);
+    fn Media(&self) -> DOMString;
+    fn SetMedia(&mut self, _media: DOMString) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult;
+    fn Scoped(&self) -> bool;
+    fn SetScoped(&self, _scoped: bool) -> ErrorResult;
+}
+
+impl<'a> HTMLStyleElementMethods for JSRef<'a, HTMLStyleElement> {
+    fn Disabled(&self) -> bool {
         false
     }
 
-    pub fn SetDisabled(&self, _disabled: bool) {
+    fn SetDisabled(&self, _disabled: bool) {
     }
 
-    pub fn Media(&self) -> DOMString {
+    fn Media(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetMedia(&mut self, _media: DOMString) -> ErrorResult {
+    fn SetMedia(&mut self, _media: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetType(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Scoped(&self) -> bool {
+    fn Scoped(&self) -> bool {
         false
     }
 
-    pub fn SetScoped(&self, _scoped: bool) -> ErrorResult {
+    fn SetScoped(&self, _scoped: bool) -> ErrorResult {
         Ok(())
     }
 }
@@ -80,26 +91,26 @@ pub trait StyleElementHelpers {
     fn parse_own_css(&self);
 }
 
-impl StyleElementHelpers for JS<HTMLStyleElement> {
+impl<'a> StyleElementHelpers for JSRef<'a, HTMLStyleElement> {
     fn parse_own_css(&self) {
-        let node: JS<Node> = NodeCast::from(self);
-        let win = window_from_node(&node);
-        let url = win.get().page().get_url();
+        let node: &JSRef<Node> = NodeCast::from_ref(self);
+        let win = window_from_node(node).root();
+        let url = win.deref().page().get_url();
 
-        let data = node.get().GetTextContent(&node).expect("Element.textContent must be a string");
+        let data = node.GetTextContent().expect("Element.textContent must be a string");
         let sheet = parse_inline_css(url, data);
-        let LayoutChan(ref layout_chan) = *win.get().page().layout_chan;
+        let LayoutChan(ref layout_chan) = *win.deref().page().layout_chan;
         layout_chan.send(AddStylesheetMsg(sheet));
     }
 }
 
-impl VirtualMethods for JS<HTMLStyleElement> {
-    fn super_type(&self) -> Option<~VirtualMethods:> {
-        let htmlelement: JS<HTMLElement> = HTMLElementCast::from(self);
-        Some(~htmlelement as ~VirtualMethods:)
+impl<'a> VirtualMethods for JSRef<'a, HTMLStyleElement> {
+    fn super_type<'a>(&'a mut self) -> Option<&'a mut VirtualMethods:> {
+        let htmlelement: &mut JSRef<HTMLElement> = HTMLElementCast::from_mut_ref(self);
+        Some(htmlelement as &mut VirtualMethods:)
     }
 
-    fn child_inserted(&mut self, child: &JS<Node>) {
+    fn child_inserted(&mut self, child: &JSRef<Node>) {
         match self.super_type() {
             Some(ref mut s) => s.child_inserted(child),
             _ => (),

src/components/script/dom/htmltablecaptionelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLTableCaptionElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLTableCaptionElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLTableCaptionElementTypeId;
@@ -28,24 +28,29 @@ impl HTMLTableCaptionElementDerived for EventTarget {
 }
 
 impl HTMLTableCaptionElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLTableCaptionElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLTableCaptionElement {
         HTMLTableCaptionElement {
             htmlelement: HTMLElement::new_inherited(HTMLTableCaptionElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLTableCaptionElement> {
-        let element = HTMLTableCaptionElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLTableCaptionElement> {
+        let element = HTMLTableCaptionElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLTableCaptionElementBinding::Wrap)
     }
 }
 
-impl HTMLTableCaptionElement {
-    pub fn Align(&self) -> DOMString {
+pub trait HTMLTableCaptionElementMethods {
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLTableCaptionElementMethods for JSRef<'a, HTMLTableCaptionElement> {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmltablecellelement.rs

@@ -3,7 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use dom::bindings::codegen::InheritTypes::HTMLTableCellElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::JSRef;
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::{ElementTypeId, HTMLTableDataCellElementTypeId, HTMLTableHeaderCellElementTypeId};
@@ -28,132 +28,164 @@ impl HTMLTableCellElementDerived for EventTarget {
 }
 
 impl HTMLTableCellElement {
-    pub fn new_inherited(type_id: ElementTypeId, tag_name: DOMString, document: JS<Document>) -> HTMLTableCellElement {
+    pub fn new_inherited(type_id: ElementTypeId, tag_name: DOMString, document: &JSRef<Document>) -> HTMLTableCellElement {
         HTMLTableCellElement {
             htmlelement: HTMLElement::new_inherited(type_id, tag_name, document)
         }
     }
 }
 
-impl HTMLTableCellElement {
-    pub fn ColSpan(&self) -> u32 {
+pub trait HTMLTableCellElementMethods {
+    fn ColSpan(&self) -> u32;
+    fn SetColSpan(&self, _col_span: u32) -> ErrorResult;
+    fn RowSpan(&self) -> u32;
+    fn SetRowSpan(&self, _col_span: u32) -> ErrorResult;
+    fn Headers(&self) -> DOMString;
+    fn SetHeaders(&self, _headers: DOMString) -> ErrorResult;
+    fn CellIndex(&self) -> i32;
+    fn GetCellIndex(&self, _cell_index: i32) -> ErrorResult;
+    fn Abbr(&self) -> DOMString;
+    fn SetAbbr(&self, _abbr: DOMString) -> ErrorResult;
+    fn Scope(&self) -> DOMString;
+    fn SetScope(&self, _abbr: DOMString) -> ErrorResult;
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&self, _align: DOMString) -> ErrorResult;
+    fn Axis(&self) -> DOMString;
+    fn SetAxis(&self, _axis: DOMString) -> ErrorResult;
+    fn Height(&self) -> DOMString;
+    fn SetHeight(&self, _height: DOMString) -> ErrorResult;
+    fn Width(&self) -> DOMString;
+    fn SetWidth(&self, _width: DOMString) -> ErrorResult;
+    fn Ch(&self) -> DOMString;
+    fn SetCh(&self, _ch: DOMString) -> ErrorResult;
+    fn ChOff(&self) -> DOMString;
+    fn SetChOff(&self, _ch_off: DOMString) -> ErrorResult;
+    fn NoWrap(&self) -> bool;
+    fn SetNoWrap(&self, _no_wrap: bool) -> ErrorResult;
+    fn VAlign(&self) -> DOMString;
+    fn SetVAlign(&self, _valign: DOMString) -> ErrorResult;
+    fn BgColor(&self) -> DOMString;
+    fn SetBgColor(&self, _bg_color: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLTableCellElementMethods for JSRef<'a, HTMLTableCellElement> {
+    fn ColSpan(&self) -> u32 {
         0
     }
 
-    pub fn SetColSpan(&self, _col_span: u32) -> ErrorResult {
+    fn SetColSpan(&self, _col_span: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn RowSpan(&self) -> u32 {
+    fn RowSpan(&self) -> u32 {
         0
     }
 
-    pub fn SetRowSpan(&self, _col_span: u32) -> ErrorResult {
+    fn SetRowSpan(&self, _col_span: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Headers(&self) -> DOMString {
+    fn Headers(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetHeaders(&self, _headers: DOMString) -> ErrorResult {
+    fn SetHeaders(&self, _headers: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn CellIndex(&self) -> i32 {
+    fn CellIndex(&self) -> i32 {
         0
     }
 
-    pub fn GetCellIndex(&self, _cell_index: i32) -> ErrorResult {
+    fn GetCellIndex(&self, _cell_index: i32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Abbr(&self) -> DOMString {
+    fn Abbr(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAbbr(&self, _abbr: DOMString) -> ErrorResult {
+    fn SetAbbr(&self, _abbr: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Scope(&self) -> DOMString {
+    fn Scope(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetScope(&self, _abbr: DOMString) -> ErrorResult {
+    fn SetScope(&self, _abbr: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Align(&self) -> DOMString {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&self, _align: DOMString) -> ErrorResult {
+    fn SetAlign(&self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Axis(&self) -> DOMString {
+    fn Axis(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAxis(&self, _axis: DOMString) -> ErrorResult {
+    fn SetAxis(&self, _axis: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Height(&self) -> DOMString {
+    fn Height(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetHeight(&self, _height: DOMString) -> ErrorResult {
+    fn SetHeight(&self, _height: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Width(&self) -> DOMString {
+    fn Width(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetWidth(&self, _width: DOMString) -> ErrorResult {
+    fn SetWidth(&self, _width: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Ch(&self) -> DOMString {
+    fn Ch(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCh(&self, _ch: DOMString) -> ErrorResult {
+    fn SetCh(&self, _ch: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn ChOff(&self) -> DOMString {
+    fn ChOff(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetChOff(&self, _ch_off: DOMString) -> ErrorResult {
+    fn SetChOff(&self, _ch_off: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn NoWrap(&self) -> bool {
+    fn NoWrap(&self) -> bool {
         false
     }
 
-    pub fn SetNoWrap(&self, _no_wrap: bool) -> ErrorResult {
+    fn SetNoWrap(&self, _no_wrap: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn VAlign(&self) -> DOMString {
+    fn VAlign(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetVAlign(&self, _valign: DOMString) -> ErrorResult {
+    fn SetVAlign(&self, _valign: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn BgColor(&self) -> DOMString {
+    fn BgColor(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetBgColor(&self, _bg_color: DOMString) -> ErrorResult {
+    fn SetBgColor(&self, _bg_color: DOMString) -> ErrorResult {
         Ok(())
     }
 }
-

src/components/script/dom/htmltablecolelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLTableColElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLTableColElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLTableColElementTypeId;
@@ -28,64 +28,79 @@ impl HTMLTableColElementDerived for EventTarget {
 }
 
 impl HTMLTableColElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLTableColElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLTableColElement {
         HTMLTableColElement {
             htmlelement: HTMLElement::new_inherited(HTMLTableColElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLTableColElement> {
-        let element = HTMLTableColElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLTableColElement> {
+        let element = HTMLTableColElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLTableColElementBinding::Wrap)
     }
 }
 
-impl HTMLTableColElement {
-    pub fn Span(&self) -> u32 {
+pub trait HTMLTableColElementMethods {
+    fn Span(&self) -> u32;
+    fn SetSpan(&mut self, _span: u32) -> ErrorResult;
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult;
+    fn Ch(&self) -> DOMString;
+    fn SetCh(&mut self, _ch: DOMString) -> ErrorResult;
+    fn ChOff(&self) -> DOMString;
+    fn SetChOff(&mut self, _ch_off: DOMString) -> ErrorResult;
+    fn VAlign(&self) -> DOMString;
+    fn SetVAlign(&mut self, _v_align: DOMString) -> ErrorResult;
+    fn Width(&self) -> DOMString;
+    fn SetWidth(&mut self, _width: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLTableColElementMethods for JSRef<'a, HTMLTableColElement> {
+    fn Span(&self) -> u32 {
         0
     }
 
-    pub fn SetSpan(&mut self, _span: u32) -> ErrorResult {
+    fn SetSpan(&mut self, _span: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Align(&self) -> DOMString {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Ch(&self) -> DOMString {
+    fn Ch(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCh(&mut self, _ch: DOMString) -> ErrorResult {
+    fn SetCh(&mut self, _ch: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn ChOff(&self) -> DOMString {
+    fn ChOff(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetChOff(&mut self, _ch_off: DOMString) -> ErrorResult {
+    fn SetChOff(&mut self, _ch_off: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn VAlign(&self) -> DOMString {
+    fn VAlign(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetVAlign(&mut self, _v_align: DOMString) -> ErrorResult {
+    fn SetVAlign(&mut self, _v_align: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Width(&self) -> DOMString {
+    fn Width(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetWidth(&mut self, _width: DOMString) -> ErrorResult {
+    fn SetWidth(&mut self, _width: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmltabledatacellelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLTableDataCellElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLTableDataCellElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::element::HTMLTableDataCellElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
@@ -27,14 +27,17 @@ impl HTMLTableDataCellElementDerived for EventTarget {
 }
 
 impl HTMLTableDataCellElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLTableDataCellElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLTableDataCellElement {
         HTMLTableDataCellElement {
             htmltablecellelement: HTMLTableCellElement::new_inherited(HTMLTableDataCellElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLTableDataCellElement> {
-        let element = HTMLTableDataCellElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLTableDataCellElement> {
+        let element = HTMLTableDataCellElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLTableDataCellElementBinding::Wrap)
     }
 }
+
+pub trait HTMLTableDataCellElementMethods {
+}

src/components/script/dom/htmltableelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLTableElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLTableElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLTableElementTypeId;
@@ -28,111 +28,139 @@ impl HTMLTableElementDerived for EventTarget {
 }
 
 impl HTMLTableElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLTableElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLTableElement {
         HTMLTableElement {
             htmlelement: HTMLElement::new_inherited(HTMLTableElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLTableElement> {
-        let element = HTMLTableElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLTableElement> {
+        let element = HTMLTableElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLTableElementBinding::Wrap)
     }
 }
 
-impl HTMLTableElement {
-    pub fn DeleteCaption(&self) {
+pub trait HTMLTableElementMethods {
+    fn DeleteCaption(&self);
+    fn DeleteTHead(&self);
+    fn DeleteTFoot(&self);
+    fn DeleteRow(&mut self, _index: i32) -> ErrorResult;
+    fn Sortable(&self) -> bool;
+    fn SetSortable(&self, _sortable: bool);
+    fn StopSorting(&self);
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&self, _align: DOMString) -> ErrorResult;
+    fn Border(&self) -> DOMString;
+    fn SetBorder(&self, _border: DOMString) -> ErrorResult;
+    fn Frame(&self) -> DOMString;
+    fn SetFrame(&self, _frame: DOMString) -> ErrorResult;
+    fn Rules(&self) -> DOMString;
+    fn SetRules(&self, _rules: DOMString) -> ErrorResult;
+    fn Summary(&self) -> DOMString;
+    fn SetSummary(&self, _summary: DOMString) -> ErrorResult;
+    fn Width(&self) -> DOMString;
+    fn SetWidth(&self, _width: DOMString) -> ErrorResult;
+    fn BgColor(&self) -> DOMString;
+    fn SetBgColor(&self, _bg_color: DOMString) -> ErrorResult;
+    fn CellPadding(&self) -> DOMString;
+    fn SetCellPadding(&self, _cell_padding: DOMString) -> ErrorResult;
+    fn CellSpacing(&self) -> DOMString;
+    fn SetCellSpacing(&self, _cell_spacing: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLTableElementMethods for JSRef<'a, HTMLTableElement> {
+    fn DeleteCaption(&self) {
     }
 
-    pub fn DeleteTHead(&self) {
+    fn DeleteTHead(&self) {
     }
 
-    pub fn DeleteTFoot(&self) {
+    fn DeleteTFoot(&self) {
     }
 
-    pub fn DeleteRow(&mut self, _index: i32) -> ErrorResult {
+    fn DeleteRow(&mut self, _index: i32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Sortable(&self) -> bool {
+    fn Sortable(&self) -> bool {
         false
     }
 
-    pub fn SetSortable(&self, _sortable: bool) {
+    fn SetSortable(&self, _sortable: bool) {
     }
 
-    pub fn StopSorting(&self) {
+    fn StopSorting(&self) {
     }
 
-    pub fn Align(&self) -> DOMString {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&self, _align: DOMString) -> ErrorResult {
+    fn SetAlign(&self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Border(&self) -> DOMString {
+    fn Border(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetBorder(&self, _border: DOMString) -> ErrorResult {
+    fn SetBorder(&self, _border: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Frame(&self) -> DOMString {
+    fn Frame(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetFrame(&self, _frame: DOMString) -> ErrorResult {
+    fn SetFrame(&self, _frame: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Rules(&self) -> DOMString {
+    fn Rules(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetRules(&self, _rules: DOMString) -> ErrorResult {
+    fn SetRules(&self, _rules: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Summary(&self) -> DOMString {
+    fn Summary(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetSummary(&self, _summary: DOMString) -> ErrorResult {
+    fn SetSummary(&self, _summary: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Width(&self) -> DOMString {
+    fn Width(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetWidth(&self, _width: DOMString) -> ErrorResult {
+    fn SetWidth(&self, _width: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn BgColor(&self) -> DOMString {
+    fn BgColor(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetBgColor(&self, _bg_color: DOMString) -> ErrorResult {
+    fn SetBgColor(&self, _bg_color: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn CellPadding(&self) -> DOMString {
+    fn CellPadding(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCellPadding(&self, _cell_padding: DOMString) -> ErrorResult {
+    fn SetCellPadding(&self, _cell_padding: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn CellSpacing(&self) -> DOMString {
+    fn CellSpacing(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCellSpacing(&self, _cell_spacing: DOMString) -> ErrorResult {
+    fn SetCellSpacing(&self, _cell_spacing: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmltableheadercellelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLTableHeaderCellElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLTableHeaderCellElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::element::HTMLTableHeaderCellElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
@@ -27,14 +27,17 @@ impl HTMLTableHeaderCellElementDerived for EventTarget {
 }
 
 impl HTMLTableHeaderCellElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLTableHeaderCellElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLTableHeaderCellElement {
         HTMLTableHeaderCellElement {
             htmltablecellelement: HTMLTableCellElement::new_inherited(HTMLTableHeaderCellElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLTableHeaderCellElement> {
-        let element = HTMLTableHeaderCellElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLTableHeaderCellElement> {
+        let element = HTMLTableHeaderCellElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLTableHeaderCellElementBinding::Wrap)
     }
 }
+
+pub trait HTMLTableHeaderCellElementMethods {
+}

src/components/script/dom/htmltablerowelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLTableRowElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLTableRowElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLTableRowElementTypeId;
@@ -28,76 +28,94 @@ impl HTMLTableRowElementDerived for EventTarget {
 }
 
 impl HTMLTableRowElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLTableRowElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLTableRowElement {
         HTMLTableRowElement {
             htmlelement: HTMLElement::new_inherited(HTMLTableRowElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLTableRowElement> {
-        let element = HTMLTableRowElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLTableRowElement> {
+        let element = HTMLTableRowElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLTableRowElementBinding::Wrap)
     }
 }
 
-impl HTMLTableRowElement {
-    pub fn RowIndex(&self) -> i32 {
+pub trait HTMLTableRowElementMethods {
+    fn RowIndex(&self) -> i32;
+    fn GetRowIndex(&self) -> i32;
+    fn SectionRowIndex(&self) -> i32;
+    fn GetSectionRowIndex(&self) -> i32;
+    fn DeleteCell(&mut self, _index: i32) -> ErrorResult;
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&self, _align: DOMString) -> ErrorResult;
+    fn Ch(&self) -> DOMString;
+    fn SetCh(&self, _ch: DOMString) -> ErrorResult;
+    fn ChOff(&self) -> DOMString;
+    fn SetChOff(&self, _ch_off: DOMString) -> ErrorResult;
+    fn VAlign(&self) -> DOMString;
+    fn SetVAlign(&self, _v_align: DOMString) -> ErrorResult;
+    fn BgColor(&self) -> DOMString;
+    fn SetBgColor(&self, _bg_color: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLTableRowElementMethods for JSRef<'a, HTMLTableRowElement> {
+    fn RowIndex(&self) -> i32 {
         0
     }
 
-    pub fn GetRowIndex(&self) -> i32 {
+    fn GetRowIndex(&self) -> i32 {
         0
     }
 
-    pub fn SectionRowIndex(&self) -> i32 {
+    fn SectionRowIndex(&self) -> i32 {
         0
     }
 
-    pub fn GetSectionRowIndex(&self) -> i32 {
+    fn GetSectionRowIndex(&self) -> i32 {
         0
     }
 
-    pub fn DeleteCell(&mut self, _index: i32) -> ErrorResult {
+    fn DeleteCell(&mut self, _index: i32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Align(&self) -> DOMString {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&self, _align: DOMString) -> ErrorResult {
+    fn SetAlign(&self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Ch(&self) -> DOMString {
+    fn Ch(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCh(&self, _ch: DOMString) -> ErrorResult {
+    fn SetCh(&self, _ch: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn ChOff(&self) -> DOMString {
+    fn ChOff(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetChOff(&self, _ch_off: DOMString) -> ErrorResult {
+    fn SetChOff(&self, _ch_off: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn VAlign(&self) -> DOMString {
+    fn VAlign(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetVAlign(&self, _v_align: DOMString) -> ErrorResult {
+    fn SetVAlign(&self, _v_align: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn BgColor(&self) -> DOMString {
+    fn BgColor(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetBgColor(&self, _bg_color: DOMString) -> ErrorResult {
+    fn SetBgColor(&self, _bg_color: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmltablesectionelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLTableSectionElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLTableSectionElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLTableSectionElementTypeId;
@@ -28,52 +28,64 @@ impl HTMLTableSectionElementDerived for EventTarget {
 }
 
 impl HTMLTableSectionElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLTableSectionElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLTableSectionElement {
         HTMLTableSectionElement {
             htmlelement: HTMLElement::new_inherited(HTMLTableSectionElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLTableSectionElement> {
-        let element = HTMLTableSectionElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLTableSectionElement> {
+        let element = HTMLTableSectionElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLTableSectionElementBinding::Wrap)
     }
 }
 
-impl HTMLTableSectionElement {
-    pub fn DeleteRow(&mut self, _index: i32) -> ErrorResult {
+pub trait HTMLTableSectionElementMethods {
+    fn DeleteRow(&mut self, _index: i32) -> ErrorResult;
+    fn Align(&self) -> DOMString;
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult;
+    fn Ch(&self) -> DOMString;
+    fn SetCh(&mut self, _ch: DOMString) -> ErrorResult;
+    fn ChOff(&self) -> DOMString;
+    fn SetChOff(&mut self, _ch_off: DOMString) -> ErrorResult;
+    fn VAlign(&self) -> DOMString;
+    fn SetVAlign(&mut self, _v_align: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLTableSectionElementMethods for JSRef<'a, HTMLTableSectionElement> {
+    fn DeleteRow(&mut self, _index: i32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Align(&self) -> DOMString {
+    fn Align(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
+    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Ch(&self) -> DOMString {
+    fn Ch(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetCh(&mut self, _ch: DOMString) -> ErrorResult {
+    fn SetCh(&mut self, _ch: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn ChOff(&self) -> DOMString {
+    fn ChOff(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetChOff(&mut self, _ch_off: DOMString) -> ErrorResult {
+    fn SetChOff(&mut self, _ch_off: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn VAlign(&self) -> DOMString {
+    fn VAlign(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetVAlign(&mut self, _v_align: DOMString) -> ErrorResult {
+    fn SetVAlign(&mut self, _v_align: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmltemplateelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLTemplateElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLTemplateElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::element::HTMLTemplateElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
@@ -27,14 +27,17 @@ impl HTMLTemplateElementDerived for EventTarget {
 }
 
 impl HTMLTemplateElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLTemplateElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLTemplateElement {
         HTMLTemplateElement {
             htmlelement: HTMLElement::new_inherited(HTMLTemplateElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLTemplateElement> {
-        let element = HTMLTemplateElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLTemplateElement> {
+        let element = HTMLTemplateElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLTemplateElementBinding::Wrap)
     }
 }
+
+pub trait HTMLTemplateElementMethods {
+}

src/components/script/dom/htmltextareaelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLTextAreaElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLTextAreaElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::{ErrorResult, Fallible};
 use dom::document::Document;
 use dom::element::HTMLTextAreaElementTypeId;
@@ -28,175 +28,219 @@ impl HTMLTextAreaElementDerived for EventTarget {
 }
 
 impl HTMLTextAreaElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLTextAreaElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLTextAreaElement {
         HTMLTextAreaElement {
             htmlelement: HTMLElement::new_inherited(HTMLTextAreaElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLTextAreaElement> {
-        let element = HTMLTextAreaElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLTextAreaElement> {
+        let element = HTMLTextAreaElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLTextAreaElementBinding::Wrap)
     }
 }
 
-impl HTMLTextAreaElement {
-    pub fn Autofocus(&self) -> bool {
+pub trait HTMLTextAreaElementMethods {
+    fn Autofocus(&self) -> bool;
+    fn SetAutofocus(&mut self, _autofocus: bool) -> ErrorResult;
+    fn Cols(&self) -> u32;
+    fn SetCols(&self, _cols: u32) -> ErrorResult;
+    fn Disabled(&self) -> bool;
+    fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult;
+    fn MaxLength(&self) -> i32;
+    fn SetMaxLength(&self, _max_length: i32) -> ErrorResult;
+    fn Name(&self) -> DOMString;
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult;
+    fn Placeholder(&self) -> DOMString;
+    fn SetPlaceholder(&mut self, _placeholder: DOMString) -> ErrorResult;
+    fn ReadOnly(&self) -> bool;
+    fn SetReadOnly(&mut self, _read_only: bool) -> ErrorResult;
+    fn Required(&self) -> bool;
+    fn SetRequired(&mut self, _required: bool) -> ErrorResult;
+    fn Rows(&self) -> u32;
+    fn SetRows(&self, _rows: u32) -> ErrorResult;
+    fn Wrap(&self) -> DOMString;
+    fn SetWrap(&mut self, _wrap: DOMString) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn SetType(&mut self, _type: DOMString);
+    fn DefaultValue(&self) -> DOMString;
+    fn SetDefaultValue(&mut self, _default_value: DOMString) -> ErrorResult;
+    fn Value(&self) -> DOMString;
+    fn SetValue(&mut self, _value: DOMString);
+    fn TextLength(&self) -> u32;
+    fn SetTextLength(&self, _text_length: u32) -> ErrorResult;
+    fn WillValidate(&self) -> bool;
+    fn SetWillValidate(&mut self, _will_validate: bool) -> ErrorResult;
+    fn ValidationMessage(&self) -> DOMString;
+    fn CheckValidity(&self) -> bool;
+    fn SetCustomValidity(&self, _error: DOMString);
+    fn Select(&self);
+    fn GetSelectionStart(&self) -> Fallible<u32>;
+    fn SetSelectionStart(&self, _selection_start: u32) -> ErrorResult;
+    fn GetSelectionEnd(&self) -> Fallible<u32>;
+    fn SetSelectionEnd(&self, _selection_end: u32) -> ErrorResult;
+    fn GetSelectionDirection(&self) -> Fallible<DOMString>;
+    fn SetSelectionDirection(&self, _selection_direction: DOMString) -> ErrorResult;
+    fn SetRangeText(&self, _replacement: DOMString);
+}
+
+impl<'a> HTMLTextAreaElementMethods for JSRef<'a, HTMLTextAreaElement> {
+    fn Autofocus(&self) -> bool {
         false
     }
 
-    pub fn SetAutofocus(&mut self, _autofocus: bool) -> ErrorResult {
+    fn SetAutofocus(&mut self, _autofocus: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Cols(&self) -> u32 {
+    fn Cols(&self) -> u32 {
         0
     }
 
-    pub fn SetCols(&self, _cols: u32) -> ErrorResult {
+    fn SetCols(&self, _cols: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Disabled(&self) -> bool {
+    fn Disabled(&self) -> bool {
         false
     }
 
-    pub fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult {
+    fn SetDisabled(&mut self, _disabled: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn MaxLength(&self) -> i32 {
+    fn MaxLength(&self) -> i32 {
         0
     }
 
-    pub fn SetMaxLength(&self, _max_length: i32) -> ErrorResult {
+    fn SetMaxLength(&self, _max_length: i32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Name(&self) -> DOMString {
+    fn Name(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetName(&mut self, _name: DOMString) -> ErrorResult {
+    fn SetName(&mut self, _name: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Placeholder(&self) -> DOMString {
+    fn Placeholder(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetPlaceholder(&mut self, _placeholder: DOMString) -> ErrorResult {
+    fn SetPlaceholder(&mut self, _placeholder: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn ReadOnly(&self) -> bool {
+    fn ReadOnly(&self) -> bool {
         false
     }
 
-    pub fn SetReadOnly(&mut self, _read_only: bool) -> ErrorResult {
+    fn SetReadOnly(&mut self, _read_only: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Required(&self) -> bool {
+    fn Required(&self) -> bool {
         false
     }
 
-    pub fn SetRequired(&mut self, _required: bool) -> ErrorResult {
+    fn SetRequired(&mut self, _required: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Rows(&self) -> u32 {
+    fn Rows(&self) -> u32 {
         0
     }
 
-    pub fn SetRows(&self, _rows: u32) -> ErrorResult {
+    fn SetRows(&self, _rows: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Wrap(&self) -> DOMString {
+    fn Wrap(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetWrap(&mut self, _wrap: DOMString) -> ErrorResult {
+    fn SetWrap(&mut self, _wrap: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetType(&mut self, _type: DOMString) {
+    fn SetType(&mut self, _type: DOMString) {
     }
 
-    pub fn DefaultValue(&self) -> DOMString {
+    fn DefaultValue(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetDefaultValue(&mut self, _default_value: DOMString) -> ErrorResult {
+    fn SetDefaultValue(&mut self, _default_value: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Value(&self) -> DOMString {
+    fn Value(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetValue(&mut self, _value: DOMString) {
+    fn SetValue(&mut self, _value: DOMString) {
     }
 
-    pub fn TextLength(&self) -> u32 {
+    fn TextLength(&self) -> u32 {
         0
     }
 
-    pub fn SetTextLength(&self, _text_length: u32) -> ErrorResult {
+    fn SetTextLength(&self, _text_length: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn WillValidate(&self) -> bool {
+    fn WillValidate(&self) -> bool {
         false
     }
 
-    pub fn SetWillValidate(&mut self, _will_validate: bool) -> ErrorResult {
+    fn SetWillValidate(&mut self, _will_validate: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn ValidationMessage(&self) -> DOMString {
+    fn ValidationMessage(&self) -> DOMString {
         ~""
     }
 
-    pub fn CheckValidity(&self) -> bool {
+    fn CheckValidity(&self) -> bool {
         false
     }
 
-    pub fn SetCustomValidity(&self, _error: DOMString) {
+    fn SetCustomValidity(&self, _error: DOMString) {
     }
 
-    pub fn Select(&self) {
+    fn Select(&self) {
     }
 
-    pub fn GetSelectionStart(&self) -> Fallible<u32> {
+    fn GetSelectionStart(&self) -> Fallible<u32> {
         Ok(0)
     }
 
-    pub fn SetSelectionStart(&self, _selection_start: u32) -> ErrorResult {
+    fn SetSelectionStart(&self, _selection_start: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetSelectionEnd(&self) -> Fallible<u32> {
+    fn GetSelectionEnd(&self) -> Fallible<u32> {
         Ok(0)
     }
 
-    pub fn SetSelectionEnd(&self, _selection_end: u32) -> ErrorResult {
+    fn SetSelectionEnd(&self, _selection_end: u32) -> ErrorResult {
         Ok(())
     }
 
-    pub fn GetSelectionDirection(&self) -> Fallible<DOMString> {
+    fn GetSelectionDirection(&self) -> Fallible<DOMString> {
         Ok(~"")
     }
 
-    pub fn SetSelectionDirection(&self, _selection_direction: DOMString) -> ErrorResult {
+    fn SetSelectionDirection(&self, _selection_direction: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn SetRangeText(&self, _replacement: DOMString) {
+    fn SetRangeText(&self, _replacement: DOMString) {
     }
 }

src/components/script/dom/htmltimeelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLTimeElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLTimeElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLTimeElementTypeId;
@@ -28,24 +28,29 @@ impl HTMLTimeElementDerived for EventTarget {
 }
 
 impl HTMLTimeElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLTimeElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLTimeElement {
         HTMLTimeElement {
             htmlelement: HTMLElement::new_inherited(HTMLTimeElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLTimeElement> {
-        let element = HTMLTimeElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLTimeElement> {
+        let element = HTMLTimeElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLTimeElementBinding::Wrap)
     }
 }
 
-impl HTMLTimeElement {
-    pub fn DateTime(&self) -> DOMString {
+pub trait HTMLTimeElementMethods {
+    fn DateTime(&self) -> DOMString;
+    fn SetDateTime(&mut self, _dateTime: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLTimeElementMethods for JSRef<'a, HTMLTimeElement> {
+    fn DateTime(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetDateTime(&mut self, _dateTime: DOMString) -> ErrorResult {
+    fn SetDateTime(&mut self, _dateTime: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmltitleelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLTitleElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLTitleElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLTitleElementTypeId;
@@ -28,24 +28,29 @@ impl HTMLTitleElementDerived for EventTarget {
 }
 
 impl HTMLTitleElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLTitleElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLTitleElement {
         HTMLTitleElement {
             htmlelement: HTMLElement::new_inherited(HTMLTitleElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLTitleElement> {
-        let element = HTMLTitleElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLTitleElement> {
+        let element = HTMLTitleElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLTitleElementBinding::Wrap)
     }
 }
 
-impl HTMLTitleElement {
-    pub fn Text(&self) -> DOMString {
+pub trait HTMLTitleElementMethods {
+    fn Text(&self) -> DOMString;
+    fn SetText(&mut self, _text: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLTitleElementMethods for JSRef<'a, HTMLTitleElement> {
+    fn Text(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetText(&mut self, _text: DOMString) -> ErrorResult {
+    fn SetText(&mut self, _text: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmltrackelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLTrackElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLTrackElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLTrackElementTypeId;
@@ -28,60 +28,74 @@ impl HTMLTrackElementDerived for EventTarget {
 }
 
 impl HTMLTrackElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLTrackElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLTrackElement {
         HTMLTrackElement {
             htmlelement: HTMLElement::new_inherited(HTMLTrackElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLTrackElement> {
-        let element = HTMLTrackElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLTrackElement> {
+        let element = HTMLTrackElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLTrackElementBinding::Wrap)
     }
 }
 
-impl HTMLTrackElement {
-    pub fn Kind(&self) -> DOMString {
+pub trait HTMLTrackElementMethods {
+    fn Kind(&self) -> DOMString;
+    fn SetKind(&mut self, _kind: DOMString) -> ErrorResult;
+    fn Src(&self) -> DOMString;
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult;
+    fn Srclang(&self) -> DOMString;
+    fn SetSrclang(&mut self, _srclang: DOMString) -> ErrorResult;
+    fn Label(&self) -> DOMString;
+    fn SetLabel(&mut self, _label: DOMString) -> ErrorResult;
+    fn Default(&self) -> bool;
+    fn SetDefault(&mut self, _default: bool) -> ErrorResult;
+    fn ReadyState(&self) -> u16;
+}
+
+impl<'a> HTMLTrackElementMethods for JSRef<'a, HTMLTrackElement> {
+    fn Kind(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetKind(&mut self, _kind: DOMString) -> ErrorResult {
+    fn SetKind(&mut self, _kind: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Src(&self) -> DOMString {
+    fn Src(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetSrc(&mut self, _src: DOMString) -> ErrorResult {
+    fn SetSrc(&mut self, _src: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Srclang(&self) -> DOMString {
+    fn Srclang(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetSrclang(&mut self, _srclang: DOMString) -> ErrorResult {
+    fn SetSrclang(&mut self, _srclang: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Label(&self) -> DOMString {
+    fn Label(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetLabel(&mut self, _label: DOMString) -> ErrorResult {
+    fn SetLabel(&mut self, _label: DOMString) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Default(&self) -> bool {
+    fn Default(&self) -> bool {
         false
     }
 
-    pub fn SetDefault(&mut self, _default: bool) -> ErrorResult {
+    fn SetDefault(&mut self, _default: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn ReadyState(&self) -> u16 {
+    fn ReadyState(&self) -> u16 {
         0
     }
 }

src/components/script/dom/htmlulistelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLUListElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLUListElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
 use dom::element::HTMLUListElementTypeId;
@@ -28,32 +28,39 @@ impl HTMLUListElementDerived for EventTarget {
 }
 
 impl HTMLUListElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLUListElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLUListElement {
         HTMLUListElement {
             htmlelement: HTMLElement::new_inherited(HTMLUListElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLUListElement> {
-        let element = HTMLUListElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLUListElement> {
+        let element = HTMLUListElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLUListElementBinding::Wrap)
     }
 }
 
-impl HTMLUListElement {
-    pub fn Compact(&self) -> bool {
+pub trait HTMLUListElementMethods {
+    fn Compact(&self) -> bool;
+    fn SetCompact(&mut self, _compact: bool) -> ErrorResult;
+    fn Type(&self) -> DOMString;
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult;
+}
+
+impl<'a> HTMLUListElementMethods for JSRef<'a, HTMLUListElement> {
+    fn Compact(&self) -> bool {
         false
     }
 
-    pub fn SetCompact(&mut self, _compact: bool) -> ErrorResult {
+    fn SetCompact(&mut self, _compact: bool) -> ErrorResult {
         Ok(())
     }
 
-    pub fn Type(&self) -> DOMString {
+    fn Type(&self) -> DOMString {
         ~""
     }
 
-    pub fn SetType(&mut self, _type: DOMString) -> ErrorResult {
+    fn SetType(&mut self, _type: DOMString) -> ErrorResult {
         Ok(())
     }
 }

src/components/script/dom/htmlunknownelement.rs

@@ -4,7 +4,7 @@
 
 use dom::bindings::codegen::BindingDeclarations::HTMLUnknownElementBinding;
 use dom::bindings::codegen::InheritTypes::HTMLUnknownElementDerived;
-use dom::bindings::js::JS;
+use dom::bindings::js::{JSRef, Temporary};
 use dom::document::Document;
 use dom::element::HTMLUnknownElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
@@ -27,14 +27,17 @@ impl HTMLUnknownElementDerived for EventTarget {
 }
 
 impl HTMLUnknownElement {
-    pub fn new_inherited(localName: DOMString, document: JS<Document>) -> HTMLUnknownElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLUnknownElement {
         HTMLUnknownElement {
             htmlelement: HTMLElement::new_inherited(HTMLUnknownElementTypeId, localName, document)
         }
     }
 
-    pub fn new(localName: DOMString, document: &JS<Document>) -> JS<HTMLUnknownElement> {
-        let element = HTMLUnknownElement::new_inherited(localName, document.clone());
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLUnknownElement> {
+        let element = HTMLUnknownElement::new_inherited(localName, document);
         Node::reflect_node(~element, document, HTMLUnknownElementBinding::Wrap)
     }
 }
+
+pub trait HTMLUnknownElementMethods {
+}