1 files changed, 7 insertions, 2 deletions
diff --git a/chromium/third_party/blink/renderer/core/html/html_summary_element.cc b/chromium/third_party/blink/renderer/core/html/html_summary_element.cc
index aa9c582e7ea..953846bcf79 100644
--- a/chromium/third_party/blink/renderer/core/html/html_summary_element.cc
+++ b/chromium/third_party/blink/renderer/core/html/html_summary_element.cc
@@ -38,8 +38,10 @@ namespace blink {
 
 HTMLSummaryElement::HTMLSummaryElement(Document& document)
     : HTMLElement(html_names::kSummaryTag, document) {
-  SetHasCustomStyleCallbacks();
-  EnsureUserAgentShadowRoot();
+  if (!RuntimeEnabledFeatures::SummaryListItemEnabled()) {
+    SetHasCustomStyleCallbacks();
+    EnsureUserAgentShadowRoot();
+  }
 }
 
 LayoutObject* HTMLSummaryElement::CreateLayoutObject(const ComputedStyle& style,
@@ -57,6 +59,7 @@ LayoutObject* HTMLSummaryElement::CreateLayoutObject(const ComputedStyle& style,
 }
 
 void HTMLSummaryElement::DidAddUserAgentShadowRoot(ShadowRoot& root) {
+  DCHECK(!RuntimeEnabledFeatures::SummaryListItemEnabled());
   auto* marker_control =
       MakeGarbageCollected<DetailsMarkerControl>(GetDocument());
   marker_control->SetIdAttribute(shadow_element_names::kIdDetailsMarker);
@@ -73,6 +76,7 @@ HTMLDetailsElement* HTMLSummaryElement::DetailsElement() const {
 }
 
 Element* HTMLSummaryElement::MarkerControl() {
+  DCHECK(!RuntimeEnabledFeatures::SummaryListItemEnabled());
   return EnsureUserAgentShadowRoot().getElementById(
       shadow_element_names::kIdDetailsMarker);
 }
@@ -161,6 +165,7 @@ bool HTMLSummaryElement::WillRespondToMouseClickEvents() {
 }
 
 void HTMLSummaryElement::WillRecalcStyle(const StyleRecalcChange) {
+  DCHECK(!RuntimeEnabledFeatures::SummaryListItemEnabled());
   if (GetForceReattachLayoutTree() && IsMainSummary()) {
     if (Element* marker = MarkerControl()) {
       marker->SetNeedsStyleRecalc(