diff --git a/third_party/blink/renderer/core/layout/layout_ruby_as_block.cc b/third_party/blink/renderer/core/layout/layout_ruby_as_block.cc
index 47f8941..03aee32 100644
--- a/third_party/blink/renderer/core/layout/layout_ruby_as_block.cc
+++ b/third_party/blink/renderer/core/layout/layout_ruby_as_block.cc
@@ -13,98 +13,58 @@
 namespace blink {
 
 LayoutRubyAsBlock::LayoutRubyAsBlock(Element* element)
-    : LayoutNGBlockFlow(element),
-      ruby_container_(MakeGarbageCollected<RubyContainer>(*this)) {
+    : LayoutNGBlockFlow(element) {
   UseCounter::Count(GetDocument(), WebFeature::kRenderRuby);
 }
 
 LayoutRubyAsBlock::~LayoutRubyAsBlock() = default;
 
-void LayoutRubyAsBlock::Trace(Visitor* visitor) const {
-  visitor->Trace(ruby_container_);
-  LayoutNGBlockFlow::Trace(visitor);
-}
-
 void LayoutRubyAsBlock::AddChild(LayoutObject* child,
                                  LayoutObject* before_child) {
   NOT_DESTROYED();
 
-  if (RuntimeEnabledFeatures::BlockRubyWrappingInlineRubyEnabled()) {
-    LayoutObject* inline_ruby = FirstChild();
-    if (!inline_ruby) {
-      if (RuntimeEnabledFeatures::RubyLineBreakableEnabled()) {
-        inline_ruby = MakeGarbageCollected<LayoutInline>(nullptr);
-      } else {
-        inline_ruby = MakeGarbageCollected<LayoutRuby>(nullptr);
-      }
-      inline_ruby->SetDocumentForAnonymous(&GetDocument());
-      ComputedStyleBuilder new_style_builder =
-          GetDocument()
-              .GetStyleResolver()
-              .CreateAnonymousStyleBuilderWithDisplay(StyleRef(),
-                                                      EDisplay::kRuby);
-      inline_ruby->SetStyle(new_style_builder.TakeStyle());
-      LayoutNGBlockFlow::AddChild(inline_ruby);
+  LayoutObject* inline_ruby = FirstChild();
+  if (!inline_ruby) {
+    if (RuntimeEnabledFeatures::RubyLineBreakableEnabled()) {
+      inline_ruby = MakeGarbageCollected<LayoutInline>(nullptr);
+    } else {
+      inline_ruby = MakeGarbageCollected<LayoutRuby>(nullptr);
     }
-    inline_ruby->AddChild(child, before_child);
-    return;
+    inline_ruby->SetDocumentForAnonymous(&GetDocument());
+    ComputedStyleBuilder new_style_builder =
+        GetDocument().GetStyleResolver().CreateAnonymousStyleBuilderWithDisplay(
+            StyleRef(), EDisplay::kRuby);
+    inline_ruby->SetStyle(new_style_builder.TakeStyle());
+    LayoutNGBlockFlow::AddChild(inline_ruby);
   }
-
-  // If the child is a ruby column, just add it normally.
-  if (child->IsRubyColumn()) {
-    LayoutNGBlockFlow::AddChild(child, before_child);
-    return;
-  }
-
-  ruby_container_->AddChild(child, before_child);
+  inline_ruby->AddChild(child, before_child);
 }
 
 void LayoutRubyAsBlock::RemoveChild(LayoutObject* child) {
   NOT_DESTROYED();
-  if (RuntimeEnabledFeatures::BlockRubyWrappingInlineRubyEnabled()) {
-    if (child->Parent() == this) {
-      DCHECK(DynamicTo<LayoutRuby>(child));
-      LayoutNGBlockFlow::RemoveChild(child);
-      return;
-    }
-    NOTREACHED() << child;
-    return;
-  }
-
-  // If the child's parent is *this (must be a ruby column), just use the normal
-  // remove method.
   if (child->Parent() == this) {
-    DCHECK(child->IsRubyColumn());
+    DCHECK(DynamicTo<LayoutRuby>(child));
     LayoutNGBlockFlow::RemoveChild(child);
     return;
   }
-
   NOTREACHED() << child;
 }
 
-void LayoutRubyAsBlock::DidRemoveChildFromColumn(LayoutObject& child) {
-  DCHECK(!RuntimeEnabledFeatures::BlockRubyWrappingInlineRubyEnabled());
-  ruby_container_->DidRemoveChildFromColumn(child);
-}
-
 void LayoutRubyAsBlock::StyleDidChange(StyleDifference diff,
                                        const ComputedStyle* old_style) {
   NOT_DESTROYED();
   LayoutNGBlockFlow::StyleDidChange(diff, old_style);
   PropagateStyleToAnonymousChildren();
-  if (RuntimeEnabledFeatures::BlockRubyWrappingInlineRubyEnabled()) {
-    // Because LayoutInline::AnonymousHasStylePropagationOverride() returns
-    // true, PropagateStyleToAnonymousChildren() doesn't update the style of
-    // the LayoutRuby child.
-    if (auto* inline_ruby = FirstChild()) {
-      ComputedStyleBuilder new_style_builder =
-          GetDocument()
-              .GetStyleResolver()
-              .CreateAnonymousStyleBuilderWithDisplay(
-                  StyleRef(), inline_ruby->StyleRef().Display());
-      UpdateAnonymousChildStyle(inline_ruby, new_style_builder);
-      inline_ruby->SetStyle(new_style_builder.TakeStyle());
-    }
+
+  // Because LayoutInline::AnonymousHasStylePropagationOverride() returns
+  // true, PropagateStyleToAnonymousChildren() doesn't update the style of
+  // the LayoutRuby child.
+  if (auto* inline_ruby = FirstChild()) {
+    ComputedStyleBuilder new_style_builder =
+        GetDocument().GetStyleResolver().CreateAnonymousStyleBuilderWithDisplay(
+            StyleRef(), inline_ruby->StyleRef().Display());
+    UpdateAnonymousChildStyle(inline_ruby, new_style_builder);
+    inline_ruby->SetStyle(new_style_builder.TakeStyle());
   }
 }
 
diff --git a/third_party/blink/renderer/core/layout/layout_ruby_as_block.h b/third_party/blink/renderer/core/layout/layout_ruby_as_block.h
index a62f9c28..fec4ab0 100644
--- a/third_party/blink/renderer/core/layout/layout_ruby_as_block.h
+++ b/third_party/blink/renderer/core/layout/layout_ruby_as_block.h
@@ -10,8 +10,6 @@
 
 namespace blink {
 
-class RubyContainer;
-
 // This is a general block container wrapping an anonymous LayoutRuby.
 //
 // https://drafts.csswg.org/css-ruby/#block-ruby
@@ -22,7 +20,6 @@
  public:
   explicit LayoutRubyAsBlock(Element*);
   ~LayoutRubyAsBlock() override;
-  void Trace(Visitor* visitor) const override;
 
   const char* GetName() const override {
     NOT_DESTROYED();
@@ -38,11 +35,6 @@
   void RemoveChild(LayoutObject* child) override;
   void StyleDidChange(StyleDifference, const ComputedStyle* old_style) override;
   void RemoveLeftoverAnonymousBlock(LayoutBlock*) override;
-
-  void DidRemoveChildFromColumn(LayoutObject& child);
-
- private:
-  Member<RubyContainer> ruby_container_;
 };
 
 template <>
diff --git a/third_party/blink/renderer/core/layout/layout_ruby_column.cc b/third_party/blink/renderer/core/layout/layout_ruby_column.cc
index a16fba2..0a3778a 100644
--- a/third_party/blink/renderer/core/layout/layout_ruby_column.cc
+++ b/third_party/blink/renderer/core/layout/layout_ruby_column.cc
@@ -6,7 +6,6 @@
 
 #include "third_party/blink/renderer/core/css/resolver/style_resolver.h"
 #include "third_party/blink/renderer/core/layout/layout_ruby.h"
-#include "third_party/blink/renderer/core/layout/layout_ruby_as_block.h"
 #include "third_party/blink/renderer/core/layout/layout_ruby_base.h"
 #include "third_party/blink/renderer/core/layout/layout_ruby_text.h"
 
@@ -114,8 +113,6 @@
     DCHECK(child->IsRubyBase() || child->IsRubyText());
     if (auto* inline_ruby = DynamicTo<LayoutRuby>(Parent())) {
       inline_ruby->DidRemoveChildFromColumn(*child);
-    } else {
-      To<LayoutRubyAsBlock>(Parent())->DidRemoveChildFromColumn(*child);
     }
     // Do nothing here! `this` might be destroyed by RubyContainer::Repair().
   }
diff --git a/third_party/blink/renderer/core/layout/ruby_container.h b/third_party/blink/renderer/core/layout/ruby_container.h
index 9b84fe6a..99b4ab3 100644
--- a/third_party/blink/renderer/core/layout/ruby_container.h
+++ b/third_party/blink/renderer/core/layout/ruby_container.h
@@ -14,7 +14,7 @@
 class LayoutBoxModelObject;
 class LayoutObject;
 
-// RubyContainer is a common part of LayoutRubyAsInline and LayoutRubyAsBlock.
+// RubyContainer is a helper for LayoutRuby.
 class RubyContainer : public GarbageCollected<RubyContainer> {
  public:
   explicit RubyContainer(LayoutBoxModelObject& ruby);
diff --git a/third_party/blink/renderer/platform/runtime_enabled_features.json5 b/third_party/blink/renderer/platform/runtime_enabled_features.json5
index f19d9fb..c1eb7df57 100644
--- a/third_party/blink/renderer/platform/runtime_enabled_features.json5
+++ b/third_party/blink/renderer/platform/runtime_enabled_features.json5
@@ -490,10 +490,6 @@
       name: "BlockingFocusWithoutUserActivation",
       status: "experimental",
     },
-    {
-      name: "BlockRubyWrappingInlineRuby",
-      status: "stable",
-    },
     // crbug.com/1147998: Mouse and Pointer boundary event dispatch (i.e. dispatch
     // of enter, leave, over, out events) tracks DOM node removal to fix event
     // pairing on ancestor nodes.