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diff --git a/layout/generic/nsRubyBaseContainerFrame.h b/layout/generic/nsRubyBaseContainerFrame.h
new file mode 100644
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+++ b/layout/generic/nsRubyBaseContainerFrame.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* rendering object for CSS "display: ruby-base-container" */
+
+#ifndef nsRubyBaseContainerFrame_h___
+#define nsRubyBaseContainerFrame_h___
+
+#include "nsContainerFrame.h"
+#include "RubyUtils.h"
+
+namespace mozilla {
+class PresShell;
+}  // namespace mozilla
+
+/**
+ * Factory function.
+ * @return a newly allocated nsRubyBaseContainerFrame (infallible)
+ */
+nsContainerFrame* NS_NewRubyBaseContainerFrame(mozilla::PresShell* aPresShell,
+                                               mozilla::ComputedStyle* aStyle);
+
+class nsRubyBaseContainerFrame final : public nsContainerFrame {
+ public:
+  NS_DECL_FRAMEARENA_HELPERS(nsRubyBaseContainerFrame)
+  NS_DECL_QUERYFRAME
+
+  // nsIFrame overrides
+  virtual bool IsFrameOfType(uint32_t aFlags) const override;
+  virtual bool CanContinueTextRun() const override;
+  virtual void AddInlineMinISize(gfxContext* aRenderingContext,
+                                 InlineMinISizeData* aData) override;
+  virtual void AddInlinePrefISize(gfxContext* aRenderingContext,
+                                  InlinePrefISizeData* aData) override;
+  SizeComputationResult ComputeSize(gfxContext* aRenderingContext,
+                                    mozilla::WritingMode aWM,
+                                    const mozilla::LogicalSize& aCBSize,
+                                    nscoord aAvailableISize,
+                                    const mozilla::LogicalSize& aMargin,
+                                    const mozilla::LogicalSize& aBorderPadding,
+                                    mozilla::ComputeSizeFlags aFlags) override;
+  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
+                      const ReflowInput& aReflowInput,
+                      nsReflowStatus& aStatus) override;
+
+  virtual nscoord GetLogicalBaseline(
+      mozilla::WritingMode aWritingMode) const override;
+
+#ifdef DEBUG_FRAME_DUMP
+  virtual nsresult GetFrameName(nsAString& aResult) const override;
+#endif
+
+  void UpdateDescendantLeadings(const mozilla::RubyBlockLeadings& aLeadings) {
+    mDescendantLeadings.Update(aLeadings);
+  }
+  mozilla::RubyBlockLeadings GetDescendantLeadings() const {
+    return mDescendantLeadings;
+  }
+
+ protected:
+  friend nsContainerFrame* NS_NewRubyBaseContainerFrame(
+      mozilla::PresShell* aPresShell, ComputedStyle* aStyle);
+
+  explicit nsRubyBaseContainerFrame(ComputedStyle* aStyle,
+                                    nsPresContext* aPresContext)
+      : nsContainerFrame(aStyle, aPresContext, kClassID) {}
+
+  struct RubyReflowInput;
+  nscoord ReflowColumns(const RubyReflowInput& aReflowInput,
+                        ReflowOutput& aDesiredSize, nsReflowStatus& aStatus);
+  nscoord ReflowOneColumn(const RubyReflowInput& aReflowInput,
+                          uint32_t aColumnIndex,
+                          const mozilla::RubyColumn& aColumn,
+                          ReflowOutput& aDesiredSize, nsReflowStatus& aStatus);
+  nscoord ReflowSpans(const RubyReflowInput& aReflowInput);
+
+  struct PullFrameState;
+
+  // Pull ruby base and corresponding ruby text frames from
+  // continuations after them.
+  void PullOneColumn(nsLineLayout* aLineLayout, PullFrameState& aPullFrameState,
+                     mozilla::RubyColumn& aColumn, bool& aIsComplete);
+
+  nscoord mBaseline;
+
+  // Leading produced by descendant ruby annotations.
+  mozilla::RubyBlockLeadings mDescendantLeadings;
+};
+
+#endif /* nsRubyBaseContainerFrame_h___ */