--- a/servo/components/style/matching.rs
+++ b/servo/components/style/matching.rs
@@ -504,16 +504,30 @@ pub trait MatchMethods : TElement {
         }
 
         // Also, don't do anything if there was no style.
         let old_primary_style = match old_styles.primary {
             Some(s) => s,
             None => return ChildCascadeRequirement::MustCascadeChildren,
         };
 
+        // If pseudo element's 'content' propety was changed, we need to update pseudo style
+        // of parent since we construct a new frame for the psudo element by parent's style.
+        if let Some(pseudo) = self.implemented_pseudo_element() {
+            if pseudo.is_before_or_after() &&
+               new_primary_style.get_counters().clone_content() !=
+               old_primary_style.get_counters().clone_content() {
+                   let parent_element =
+                       self.inheritance_parent().expect("Faild to get parent");
+                   let mut parent_data = unsafe { parent_element.ensure_data() };
+                   parent_data.styles.pseudos.set(&pseudo, new_primary_style.clone());
+                   parent_data.restyle.damage |= RestyleDamage::reconstruct();
+               }
+        }
+
         cascade_requirement = cmp::max(
             cascade_requirement,
             self.accumulate_damage_for(
                 context.shared,
                 &mut data.restyle,
                 &old_primary_style,
                 new_primary_style,
                 None,