diff --git a/components/style/dom.rs b/components/style/dom.rs
index 36997de5c32..de9d68396c7 100644
--- a/components/style/dom.rs
+++ b/components/style/dom.rs
@@ -13,7 +13,7 @@ use atomic_refcell::{AtomicRef, AtomicRefCell, AtomicRefMut};
 use data::ElementData;
 use element_state::ElementState;
 use font_metrics::FontMetricsProvider;
-use properties::{ComputedValues, PropertyDeclarationBlock};
+use properties::{AnimationRules, ComputedValues, PropertyDeclarationBlock};
 #[cfg(feature = "gecko")] use properties::animated_properties::AnimationValue;
 #[cfg(feature = "gecko")] use properties::animated_properties::TransitionProperty;
 use rule_tree::CascadeLevel;
@@ -274,20 +274,6 @@ pub trait PresentationalHintsSynthesizer {
         where V: Push<ApplicableDeclarationBlock>;
 }
 
-/// The animation rules.
-///
-/// The first one is for Animation cascade level, and the second one is for
-/// Transition cascade level.
-pub struct AnimationRules(pub Option<Arc<Locked<PropertyDeclarationBlock>>>,
-                          pub Option<Arc<Locked<PropertyDeclarationBlock>>>);
-
-impl AnimationRules {
-    /// Returns whether these animation rules represents an actual rule or not.
-    pub fn is_empty(&self) -> bool {
-        self.0.is_none() && self.1.is_none()
-    }
-}
-
 /// The element trait, the main abstraction the style crate acts over.
 pub trait TElement : Eq + PartialEq + Debug + Hash + Sized + Copy + Clone +
                      ElementExt + PresentationalHintsSynthesizer {
diff --git a/components/style/gecko/wrapper.rs b/components/style/gecko/wrapper.rs
index e043ff57223..011e0bff078 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -18,7 +18,7 @@ use app_units::Au;
 use atomic_refcell::AtomicRefCell;
 use context::{QuirksMode, SharedStyleContext, UpdateAnimationsTasks};
 use data::ElementData;
-use dom::{self, AnimationRules, DescendantsBit, LayoutIterator, NodeInfo, TElement, TNode, UnsafeNode};
+use dom::{self, DescendantsBit, LayoutIterator, NodeInfo, TElement, TNode, UnsafeNode};
 use dom::{OpaqueNode, PresentationalHintsSynthesizer};
 use element_state::ElementState;
 use error_reporting::RustLogReporter;
@@ -57,7 +57,7 @@ use gecko_bindings::structs::NODE_IS_NATIVE_ANONYMOUS;
 use gecko_bindings::sugar::ownership::HasArcFFI;
 use logical_geometry::WritingMode;
 use media_queries::Device;
-use properties::{ComputedValues, parse_style_attribute};
+use properties::{AnimationRules, ComputedValues, parse_style_attribute};
 use properties::{Importance, PropertyDeclaration, PropertyDeclarationBlock};
 use properties::animated_properties::{AnimationValue, AnimationValueMap, TransitionProperty};
 use properties::style_structs::Font;
diff --git a/components/style/matching.rs b/components/style/matching.rs
index f0e23baecff..578ecb4f2d5 100644
--- a/components/style/matching.rs
+++ b/components/style/matching.rs
@@ -10,10 +10,10 @@
 use cascade_info::CascadeInfo;
 use context::{SelectorFlagsMap, SharedStyleContext, StyleContext};
 use data::{ComputedStyle, ElementData, RestyleData};
-use dom::{AnimationRules, TElement, TNode};
+use dom::{TElement, TNode};
 use font_metrics::FontMetricsProvider;
 use log::LogLevel::Trace;
-use properties::{CascadeFlags, ComputedValues, SKIP_ROOT_AND_ITEM_BASED_DISPLAY_FIXUP, cascade};
+use properties::{AnimationRules, CascadeFlags, ComputedValues, SKIP_ROOT_AND_ITEM_BASED_DISPLAY_FIXUP, cascade};
 use properties::longhands::display::computed_value as display;
 use restyle_hints::{RESTYLE_CSS_ANIMATIONS, RESTYLE_CSS_TRANSITIONS, RestyleReplacements};
 use restyle_hints::{RESTYLE_STYLE_ATTRIBUTE, RESTYLE_SMIL};
diff --git a/components/style/properties/declaration_block.rs b/components/style/properties/declaration_block.rs
index 1bd565f2153..c826d56a6b3 100644
--- a/components/style/properties/declaration_block.rs
+++ b/components/style/properties/declaration_block.rs
@@ -11,6 +11,7 @@ use cssparser::{DeclarationListParser, parse_important};
 use cssparser::{Parser, AtRuleParser, DeclarationParser, Delimiter};
 use error_reporting::ParseErrorReporter;
 use parser::{PARSING_MODE_DEFAULT, ParsingMode, ParserContext, log_css_error};
+use shared_lock::Locked;
 use std::fmt;
 use std::slice::Iter;
 use style_traits::ToCss;
@@ -18,6 +19,20 @@ use stylesheets::{CssRuleType, Origin, UrlExtraData};
 use super::*;
 #[cfg(feature = "gecko")] use properties::animated_properties::AnimationValueMap;
 
+/// The animation rules.
+///
+/// The first one is for Animation cascade level, and the second one is for
+/// Transition cascade level.
+pub struct AnimationRules(pub Option<Arc<Locked<PropertyDeclarationBlock>>>,
+                          pub Option<Arc<Locked<PropertyDeclarationBlock>>>);
+
+impl AnimationRules {
+    /// Returns whether these animation rules represents an actual rule or not.
+    pub fn is_empty(&self) -> bool {
+        self.0.is_none() && self.1.is_none()
+    }
+}
+
 /// A declaration [importance][importance].
 ///
 /// [importance]: https://drafts.csswg.org/css-cascade/#importance
diff --git a/components/style/stylist.rs b/components/style/stylist.rs
index 7fb64c8acf5..315e0b5207c 100644
--- a/components/style/stylist.rs
+++ b/components/style/stylist.rs
@@ -8,7 +8,7 @@ use {Atom, LocalName, Namespace};
 use bit_vec::BitVec;
 use context::{QuirksMode, SharedStyleContext};
 use data::ComputedStyle;
-use dom::{AnimationRules, TElement};
+use dom::TElement;
 use element_state::ElementState;
 use error_reporting::RustLogReporter;
 use font_metrics::FontMetricsProvider;
@@ -17,9 +17,9 @@ use gecko_bindings::structs::nsIAtom;
 use keyframes::KeyframesAnimation;
 use media_queries::Device;
 use properties::{self, CascadeFlags, ComputedValues};
+use properties::{AnimationRules, PropertyDeclarationBlock};
 #[cfg(feature = "servo")]
 use properties::INHERIT_ALL;
-use properties::PropertyDeclarationBlock;
 use restyle_hints::{HintComputationContext, DependencySet, RestyleHint};
 use rule_tree::{CascadeLevel, RuleTree, StrongRuleNode, StyleSource};
 use selector_map::{SelectorMap, SelectorMapEntry};