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diff --git a/components/script_traits/lib.rs b/components/script_traits/lib.rs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * 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/. */
+
+#![comment = "The Servo Parallel Browser Project"]
+#![license = "MPL"]
+
+extern crate geom;
+extern crate servo_msg = "msg";
+extern crate servo_net = "net";
+extern crate url;
+extern crate std;
+extern crate serialize;
+
+// This module contains traits in script used generically
+//   in the rest of Servo.
+// The traits are here instead of in layout so
+//   that these modules won't have to depend on script.
+
+use servo_msg::constellation_msg::{ConstellationChan, PipelineId, Failure, WindowSizeData};
+use servo_msg::constellation_msg::SubpageId;
+use servo_msg::compositor_msg::ScriptListener;
+use servo_net::image_cache_task::ImageCacheTask;
+use servo_net::resource_task::ResourceTask;
+use std::any::Any;
+use url::Url;
+
+use geom::point::Point2D;
+
+use serialize::{Encodable, Encoder};
+
+pub struct NewLayoutInfo {
+    pub old_pipeline_id: PipelineId,
+    pub new_pipeline_id: PipelineId,
+    pub subpage_id: SubpageId,
+    pub layout_chan: Box<Any+Send>, // opaque reference to a LayoutChannel
+}
+
+/// Messages sent from the constellation to the script task
+pub enum ConstellationControlMsg {
+    /// Loads a new URL on the specified pipeline.
+    LoadMsg(PipelineId, Url),
+    /// Gives a channel and ID to a layout task, as well as the ID of that layout's parent
+    AttachLayoutMsg(NewLayoutInfo),
+    /// Window resized.  Sends a DOM event eventually, but first we combine events.
+    ResizeMsg(PipelineId, WindowSizeData),
+    /// Notifies script that window has been resized but to not take immediate action.
+    ResizeInactiveMsg(PipelineId, WindowSizeData),
+    /// Notifies the script that a pipeline should be closed.
+    ExitPipelineMsg(PipelineId),
+    /// Sends a DOM event.
+    SendEventMsg(PipelineId, CompositorEvent),
+    /// Notifies script that reflow is finished.
+    ReflowCompleteMsg(PipelineId, uint),
+}
+
+/// Events from the compositor that the script task needs to know about
+pub enum CompositorEvent {
+    ResizeEvent(WindowSizeData),
+    ReflowEvent,
+    ClickEvent(uint, Point2D<f32>),
+    MouseDownEvent(uint, Point2D<f32>),
+    MouseUpEvent(uint, Point2D<f32>),
+    MouseMoveEvent(Point2D<f32>)
+}
+
+/// An opaque wrapper around script<->layout channels to avoid leaking message types into
+/// crates that don't need to know about them.
+pub struct OpaqueScriptLayoutChannel(pub (Box<Any+Send>, Box<Any+Send>));
+
+/// Encapsulates external communication with the script task.
+#[deriving(Clone)]
+pub struct ScriptControlChan(pub Sender<ConstellationControlMsg>);
+
+impl<S: Encoder<E>, E> Encodable<S, E> for ScriptControlChan {
+    fn encode(&self, _s: &mut S) -> Result<(), E> {
+        Ok(())
+    }
+}
+
+pub trait ScriptTaskFactory {
+    fn create<C: ScriptListener + Send>(_phantom: Option<&mut Self>,
+                                        id: PipelineId,
+                                        compositor: Box<C>,
+                                        layout_chan: &OpaqueScriptLayoutChannel,
+                                        control_chan: ScriptControlChan,
+                                        control_port: Receiver<ConstellationControlMsg>,
+                                        constellation_msg: ConstellationChan,
+                                        failure_msg: Failure,
+                                        resource_task: ResourceTask,
+                                        image_cache_task: ImageCacheTask,
+                                        window_size: WindowSizeData);
+    fn create_layout_channel(_phantom: Option<&mut Self>) -> OpaqueScriptLayoutChannel;
+    fn clone_layout_channel(_phantom: Option<&mut Self>, pair: &OpaqueScriptLayoutChannel) -> Box<Any+Send>;
+}