diff --git a/components/script/dom/bindings/trace.rs b/components/script/dom/bindings/trace.rs
index 766556efd16..6da8e9a1c5f 100644
--- a/components/script/dom/bindings/trace.rs
+++ b/components/script/dom/bindings/trace.rs
@@ -29,6 +29,7 @@
 //! The `unsafe_no_jsmanaged_fields!()` macro adds an empty implementation of
 //! `JSTraceable` to a datatype.
 
+use app_units::Au;
 use canvas_traits::{CanvasGradientStop, LinearGradientStyle, RadialGradientStyle};
 use canvas_traits::{CompositionOrBlending, LineCapStyle, LineJoinStyle, RepetitionStyle};
 use cssparser::RGBA;
@@ -69,6 +70,7 @@ use net_traits::response::{Response, ResponseBody};
 use net_traits::response::HttpsState;
 use net_traits::storage_thread::StorageType;
 use offscreen_gl_context::GLLimits;
+use parking_lot::RwLock;
 use profile_traits::mem::ProfilerChan as MemProfilerChan;
 use profile_traits::time::ProfilerChan as TimeProfilerChan;
 use script_layout_interface::OpaqueStyleAndLayoutData;
@@ -86,16 +88,20 @@ use std::hash::{BuildHasher, Hash};
 use std::ops::{Deref, DerefMut};
 use std::path::PathBuf;
 use std::rc::Rc;
-use std::sync::Arc;
+use std::sync::{Arc, Mutex};
 use std::sync::atomic::{AtomicBool, AtomicUsize};
 use std::sync::mpsc::{Receiver, Sender};
 use std::time::{SystemTime, Instant};
 use style::attr::{AttrIdentifier, AttrValue, LengthOrPercentageOrAuto};
 use style::element_state::*;
+use style::font_face::FontFaceRule;
+use style::keyframes::Keyframe;
 use style::media_queries::MediaList;
 use style::properties::PropertyDeclarationBlock;
 use style::selector_parser::{PseudoElement, Snapshot};
+use style::stylesheets::{CssRules, KeyframesRule, MediaRule, NamespaceRule, StyleRule};
 use style::values::specified::Length;
+use style::viewport::ViewportRule;
 use time::Duration;
 use url::Origin as UrlOrigin;
 use uuid::Uuid;
@@ -157,6 +163,12 @@ unsafe impl<T: JSTraceable> JSTraceable for Rc<T> {
     }
 }
 
+unsafe impl<T: JSTraceable> JSTraceable for Arc<T> {
+    unsafe fn trace(&self, trc: *mut JSTracer) {
+        (**self).trace(trc)
+    }
+}
+
 unsafe impl<T: JSTraceable + ?Sized> JSTraceable for Box<T> {
     unsafe fn trace(&self, trc: *mut JSTracer) {
         (**self).trace(trc)
@@ -311,17 +323,10 @@ unsafe impl<A: JSTraceable, B: JSTraceable, C: JSTraceable> JSTraceable for (A,
 unsafe_no_jsmanaged_fields!(bool, f32, f64, String, ServoUrl, AtomicBool, AtomicUsize, UrlOrigin, Uuid, char);
 unsafe_no_jsmanaged_fields!(usize, u8, u16, u32, u64);
 unsafe_no_jsmanaged_fields!(isize, i8, i16, i32, i64);
-unsafe_no_jsmanaged_fields!(Sender<T>);
-unsafe_no_jsmanaged_fields!(Receiver<T>);
-unsafe_no_jsmanaged_fields!(Point2D<T>);
-unsafe_no_jsmanaged_fields!(Rect<T>);
-unsafe_no_jsmanaged_fields!(Size2D<T>);
-unsafe_no_jsmanaged_fields!(Arc<T>);
 unsafe_no_jsmanaged_fields!(Image, ImageMetadata, ImageCacheChan, ImageCacheThread);
 unsafe_no_jsmanaged_fields!(Metadata);
 unsafe_no_jsmanaged_fields!(NetworkError);
 unsafe_no_jsmanaged_fields!(Atom, Prefix, LocalName, Namespace, QualName);
-unsafe_no_jsmanaged_fields!(Trusted<T: Reflectable>);
 unsafe_no_jsmanaged_fields!(TrustedPromise);
 unsafe_no_jsmanaged_fields!(PropertyDeclarationBlock);
 // These three are interdependent, if you plan to put jsmanaged data
@@ -337,9 +342,6 @@ unsafe_no_jsmanaged_fields!(WindowProxyHandler);
 unsafe_no_jsmanaged_fields!(UntrustedNodeAddress);
 unsafe_no_jsmanaged_fields!(LengthOrPercentageOrAuto);
 unsafe_no_jsmanaged_fields!(RGBA);
-unsafe_no_jsmanaged_fields!(EuclidLength<Unit, T>);
-unsafe_no_jsmanaged_fields!(Matrix2D<T>);
-unsafe_no_jsmanaged_fields!(Matrix4D<T>);
 unsafe_no_jsmanaged_fields!(StorageType);
 unsafe_no_jsmanaged_fields!(CanvasGradientStop, LinearGradientStyle, RadialGradientStyle);
 unsafe_no_jsmanaged_fields!(LineCapStyle, LineJoinStyle, CompositionOrBlending);
@@ -424,6 +426,148 @@ unsafe impl<T> JSTraceable for IpcReceiver<T> where T: Deserialize + Serialize {
     }
 }
 
+unsafe impl<T: Reflectable> JSTraceable for Trusted<T> {
+    #[inline]
+    unsafe fn trace(&self, _: *mut JSTracer) {
+        // Do nothing
+    }
+}
+
+unsafe impl<T: Send> JSTraceable for Receiver<T> {
+    #[inline]
+    unsafe fn trace(&self, _: *mut JSTracer) {
+        // Do nothing
+    }
+}
+
+unsafe impl<T: Send> JSTraceable for Sender<T> {
+    #[inline]
+    unsafe fn trace(&self, _: *mut JSTracer) {
+        // Do nothing
+    }
+}
+
+unsafe impl JSTraceable for Matrix2D<f32> {
+    #[inline]
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing
+    }
+}
+
+unsafe impl JSTraceable for Matrix4D<f64> {
+    #[inline]
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing
+    }
+}
+
+unsafe impl JSTraceable for Point2D<f32> {
+    #[inline]
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing
+    }
+}
+
+unsafe impl<T> JSTraceable for EuclidLength<u64, T> {
+    #[inline]
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing
+    }
+}
+
+unsafe impl JSTraceable for Rect<Au> {
+    #[inline]
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing
+    }
+}
+
+unsafe impl JSTraceable for Rect<f32> {
+    #[inline]
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing
+    }
+}
+
+unsafe impl JSTraceable for Size2D<i32> {
+    #[inline]
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing
+    }
+}
+
+unsafe impl JSTraceable for Mutex<Option<SharedRt>> {
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing.
+    }
+}
+
+unsafe impl JSTraceable for RwLock<FontFaceRule> {
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing.
+    }
+}
+
+unsafe impl JSTraceable for RwLock<CssRules> {
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing.
+    }
+}
+
+unsafe impl JSTraceable for RwLock<Keyframe> {
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing.
+    }
+}
+
+unsafe impl JSTraceable for RwLock<KeyframesRule> {
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing.
+    }
+}
+
+unsafe impl JSTraceable for RwLock<MediaRule> {
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing.
+    }
+}
+
+unsafe impl JSTraceable for RwLock<NamespaceRule> {
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing.
+    }
+}
+
+unsafe impl JSTraceable for RwLock<StyleRule> {
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing.
+    }
+}
+
+unsafe impl JSTraceable for RwLock<ViewportRule> {
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing.
+    }
+}
+
+unsafe impl JSTraceable for RwLock<PropertyDeclarationBlock> {
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing.
+    }
+}
+
+unsafe impl JSTraceable for RwLock<SharedRt> {
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing.
+    }
+}
+
+unsafe impl JSTraceable for RwLock<MediaList> {
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing.
+    }
+}
+
 /// Homemade trait object for JSTraceable things
 struct TraceableInfo {
     pub ptr: *const libc::c_void,
diff --git a/components/script/dom/bindings/weakref.rs b/components/script/dom/bindings/weakref.rs
index 2018c0f9a72..68feff79180 100644
--- a/components/script/dom/bindings/weakref.rs
+++ b/components/script/dom/bindings/weakref.rs
@@ -133,7 +133,11 @@ impl<T: WeakReferenceable> PartialEq<T> for WeakRef<T> {
     }
 }
 
-unsafe_no_jsmanaged_fields!(WeakRef<T: WeakReferenceable>);
+unsafe impl<T: WeakReferenceable> JSTraceable for WeakRef<T> {
+    unsafe fn trace(&self, _: *mut JSTracer) {
+        // Do nothing.
+    }
+}
 
 impl<T: WeakReferenceable> Drop for WeakRef<T> {
     fn drop(&mut self) {
diff --git a/components/script/dom/macros.rs b/components/script/dom/macros.rs
index bb5a55bcc54..2eab30d3fd0 100644
--- a/components/script/dom/macros.rs
+++ b/components/script/dom/macros.rs
@@ -323,24 +323,6 @@ macro_rules! unsafe_no_jsmanaged_fields(
             }
         )+
     );
-    ($ty:ident<$($gen:ident),+>) => (
-        #[allow(unsafe_code)]
-        unsafe impl<$($gen),+> $crate::dom::bindings::trace::JSTraceable for $ty<$($gen),+> {
-            #[inline]
-            unsafe fn trace(&self, _: *mut ::js::jsapi::JSTracer) {
-                // Do nothing
-            }
-        }
-    );
-    ($ty:ident<$($gen:ident: $bound:ident),+>) => (
-        #[allow(unsafe_code)]
-        unsafe impl<$($gen: $bound),+> $crate::dom::bindings::trace::JSTraceable for $ty<$($gen),+> {
-            #[inline]
-            unsafe fn trace(&self, _: *mut ::js::jsapi::JSTracer) {
-                // Do nothing
-            }
-        }
-    );
 );
 
 /// These are used to generate a event handler which has no special case.