--- a/dom/base/nsStyleLinkElement.cpp
+++ b/dom/base/nsStyleLinkElement.cpp
@@ -426,17 +426,17 @@ nsStyleLinkElement::DoUpdateStyleSheet(n
       (aOldShadowRoot || containingShadow)) {
     return NS_OK;
   }
 
   // XXXheycam ServoStyleSheets do not support <style scoped>.
   Element* oldScopeElement = nullptr;
   if (mStyleSheet) {
     if (mStyleSheet->IsServo()) {
-      NS_WARNING("stylo: ServoStyleSheets don't support <style scoped>");
+      // XXXheycam ServoStyleSheets don't support <style scoped>.
     } else {
       oldScopeElement = mStyleSheet->AsGecko()->GetScopeElement();
     }
   }
 
   if (mStyleSheet && (aOldDocument || aOldShadowRoot)) {
     MOZ_ASSERT(!(aOldDocument && aOldShadowRoot),
                "ShadowRoot content is never in document, thus "
@@ -591,17 +591,16 @@ void
 nsStyleLinkElement::UpdateStyleSheetScopedness(bool aIsNowScoped)
 {
   if (!mStyleSheet) {
     return;
   }
 
   if (mStyleSheet->IsServo()) {
     // XXXheycam ServoStyleSheets don't support <style scoped>.
-    NS_ERROR("stylo: ServoStyleSheets don't support <style scoped>");
     return;
   }
 
   CSSStyleSheet* sheet = mStyleSheet->AsGecko();
 
   nsCOMPtr<nsIContent> thisContent;
   CallQueryInterface(this, getter_AddRefs(thisContent));