A forced break inside a break-inside:avoid object may make it fit where it is.

third_party/WebKit/Source/core/layout/LayoutBlockFlow.h

Index: third_party/WebKit/Source/core/layout/LayoutBlockFlow.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutBlockFlow.h b/third_party/WebKit/Source/core/layout/LayoutBlockFlow.h
index 14a6cd12d1e0678341d6b47a0c32611dab0237bf..22d9711f33818da5ea0aa60e1126a518adf306ac 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBlockFlow.h
+++ b/third_party/WebKit/Source/core/layout/LayoutBlockFlow.h
@@ -306,6 +306,13 @@ class CORE_EXPORT LayoutBlockFlow : public LayoutBlock {
   }
   void setPaginationStrutPropagatedFromChild(LayoutUnit);
 
+  LayoutUnit firstForcedBreakOffset() const {
+    if (!m_rareData)
+      return LayoutUnit();
+    return m_rareData->m_firstForcedBreakOffset;
+  }
+  void setFirstForcedBreakOffset(LayoutUnit);
+
   void positionSpannerDescendant(LayoutMultiColumnSpannerPlaceholder& child);
 
   bool avoidsFloats() const override;
@@ -679,6 +686,8 @@ class CORE_EXPORT LayoutBlockFlow : public LayoutBlock {
     MarginValues m_margins;
     LayoutUnit m_paginationStrutPropagatedFromChild;
 
+    LayoutUnit m_firstForcedBreakOffset;
+
     LayoutMultiColumnFlowThread* m_multiColumnFlowThread;
 
     unsigned m_breakBefore : 4;