--- a/layout/style/ServoStyleSet.cpp
+++ b/layout/style/ServoStyleSet.cpp
@@ -417,16 +417,18 @@ ServoStyleSet::ResolvePseudoElementStyle
                          aType == CSSPseudoElementType::after;
   return GetContext(computedValues.forget(), aParentContext, pseudoTag, aType,
                     isBeforeOrAfter ? aOriginatingElement : nullptr);
 }
 
 already_AddRefed<nsStyleContext>
 ServoStyleSet::ResolveTransientStyle(Element* aElement, CSSPseudoElementType aType)
 {
+  PreTraverseSync();
+
   nsIAtom* pseudoTag = nullptr;
   if (aType != CSSPseudoElementType::NotPseudo) {
     pseudoTag = nsCSSPseudoElements::GetPseudoAtom(aType);
   }
 
   RefPtr<ServoComputedValues> computedValues =
     ResolveStyleLazily(aElement, pseudoTag);