1 files changed, 53 insertions, 0 deletions
diff --git a/components/script/dom/raredata.rs b/components/script/dom/raredata.rs
new file mode 100644
index 00000000000..9d4a82d63d6
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+++ b/components/script/dom/raredata.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 https://mozilla.org/MPL/2.0/. */
+
+use crate::dom::bindings::root::Dom;
+use crate::dom::customelementregistry::{
+    CustomElementDefinition, CustomElementReaction, CustomElementState,
+};
+use crate::dom::mutationobserver::RegisteredObserver;
+use crate::dom::node::UniqueId;
+use crate::dom::shadowroot::ShadowRoot;
+use crate::dom::window::LayoutValue;
+use euclid::default::Rect;
+use servo_atoms::Atom;
+use std::rc::Rc;
+
+//XXX(ferjm) Ideally merge NodeRareData and ElementRareData so they share
+//           storage.
+
+#[derive(Default, JSTraceable, MallocSizeOf)]
+#[unrooted_must_root_lint::must_root]
+pub struct NodeRareData {
+    /// The shadow root the node belongs to.
+    /// This is None if the node is not in a shadow tree or
+    /// if it is a ShadowRoot.
+    pub containing_shadow_root: Option<Dom<ShadowRoot>>,
+    /// Registered observers for this node.
+    pub mutation_observers: Vec<RegisteredObserver>,
+    /// Lazily-generated Unique Id for this node.
+    pub unique_id: Option<UniqueId>,
+}
+
+#[derive(Default, JSTraceable, MallocSizeOf)]
+#[unrooted_must_root_lint::must_root]
+pub struct ElementRareData {
+    /// https://dom.spec.whatwg.org/#dom-element-shadowroot
+    /// The ShadowRoot this element is host of.
+    /// XXX This is currently not exposed to web content. Only for
+    ///     internal use.
+    pub shadow_root: Option<Dom<ShadowRoot>>,
+    /// <https://html.spec.whatwg.org/multipage/#custom-element-reaction-queue>
+    pub custom_element_reaction_queue: Vec<CustomElementReaction>,
+    /// <https://dom.spec.whatwg.org/#concept-element-custom-element-definition>
+    #[ignore_malloc_size_of = "Rc"]
+    pub custom_element_definition: Option<Rc<CustomElementDefinition>>,
+    /// <https://dom.spec.whatwg.org/#concept-element-custom-element-state>
+    pub custom_element_state: CustomElementState,
+    /// The "name" content attribute; not used as frequently as id, but used
+    /// in named getter loops so it's worth looking up quickly when present
+    pub name_attribute: Option<Atom>,
+    /// The client rect reported by layout.
+    pub client_rect: Option<LayoutValue<Rect<i32>>>,
+}