diff --git a/components/style/matching.rs b/components/style/matching.rs
index c9d24fb0e38..5d8b8b965c4 100644
--- a/components/style/matching.rs
+++ b/components/style/matching.rs
@@ -19,7 +19,8 @@ use dom::{AnimationRules, SendElement, TElement, TNode};
 use font_metrics::FontMetricsProvider;
 use properties::{CascadeFlags, ComputedValues, SKIP_ROOT_AND_ITEM_BASED_DISPLAY_FIXUP, cascade};
 use properties::longhands::display::computed_value as display;
-use restyle_hints::{RESTYLE_STYLE_ATTRIBUTE, RESTYLE_CSS_ANIMATIONS, RESTYLE_CSS_TRANSITIONS, RestyleHint};
+use restyle_hints::{RESTYLE_CSS_ANIMATIONS, RESTYLE_CSS_TRANSITIONS, RestyleHint};
+use restyle_hints::{RESTYLE_STYLE_ATTRIBUTE, RESTYLE_SMIL};
 use rule_tree::{CascadeLevel, RuleTree, StrongRuleNode};
 use selector_parser::{PseudoElement, RestyleDamage, SelectorImpl};
 use selectors::bloom::BloomFilter;
@@ -1072,12 +1073,18 @@ pub trait MatchMethods : TElement {
                 }
             };
 
-            // RESTYLE_CSS_ANIMATIONS or RESTYLE_CSS_TRANSITIONS is processed prior to other
-            // restyle hints in the name of animation-only traversal. Rest of restyle hints
-            // will be processed in a subsequent normal traversal.
+            // Animation restyle hints are processed prior to other restyle hints in the
+            // animation-only traversal. Non-animation restyle hints will be processed in
+            // a subsequent normal traversal.
             if hint.intersects(RestyleHint::for_animations()) {
                 debug_assert!(context.shared.traversal_flags.for_animation_only());
 
+                if hint.contains(RESTYLE_SMIL) {
+                    replace_rule_node(CascadeLevel::SMILOverride,
+                                      self.get_smil_override(),
+                                      primary_rules);
+                }
+
                 use data::EagerPseudoStyles;
                 let mut replace_rule_node_for_animation = |level: CascadeLevel,
                                                            primary_rules: &mut StrongRuleNode,
diff --git a/components/style/restyle_hints.rs b/components/style/restyle_hints.rs
index d28bbee910f..d1d733417e0 100644
--- a/components/style/restyle_hints.rs
+++ b/components/style/restyle_hints.rs
@@ -62,6 +62,11 @@ bitflags! {
         /// attribute has changed, and this change didn't have any other
         /// dependencies.
         const RESTYLE_STYLE_ATTRIBUTE = 0x40,
+
+        /// Replace the style data coming from SMIL animations without updating
+        /// any other style data. This hint is only processed in animation-only
+        /// traversal which is prior to normal traversal.
+        const RESTYLE_SMIL = 0x80,
     }
 }
 
@@ -95,19 +100,22 @@ pub fn assert_restyle_hints_match() {
         nsRestyleHint_eRestyle_CSSTransitions => RESTYLE_CSS_TRANSITIONS,
         nsRestyleHint_eRestyle_CSSAnimations => RESTYLE_CSS_ANIMATIONS,
         nsRestyleHint_eRestyle_StyleAttribute => RESTYLE_STYLE_ATTRIBUTE,
+        nsRestyleHint_eRestyle_StyleAttribute_Animations => RESTYLE_SMIL,
     }
 }
 
 impl RestyleHint {
     /// The subset hints that affect the styling of a single element during the
     /// traversal.
+    #[inline]
     pub fn for_self() -> Self {
-        RESTYLE_SELF | RESTYLE_STYLE_ATTRIBUTE | RESTYLE_CSS_ANIMATIONS | RESTYLE_CSS_TRANSITIONS
+        RESTYLE_SELF | RESTYLE_STYLE_ATTRIBUTE | Self::for_animations()
     }
 
     /// The subset hints that are used for animation restyle.
+    #[inline]
     pub fn for_animations() -> Self {
-        RESTYLE_CSS_ANIMATIONS | RESTYLE_CSS_TRANSITIONS
+        RESTYLE_SMIL | RESTYLE_CSS_ANIMATIONS | RESTYLE_CSS_TRANSITIONS
     }
 }