Even block flows with inline children must be examined when balancing columns.

third_party/WebKit/Source/core/layout/ColumnBalancer.cpp

Index: third_party/WebKit/Source/core/layout/ColumnBalancer.cpp
diff --git a/third_party/WebKit/Source/core/layout/ColumnBalancer.cpp b/third_party/WebKit/Source/core/layout/ColumnBalancer.cpp
index 524d8c054e26a6efdf186efa713cf896241fc1b5..cbd19aa7ab697c6c94a7b1155ec7a57210c6ba00 100644
--- a/third_party/WebKit/Source/core/layout/ColumnBalancer.cpp
+++ b/third_party/WebKit/Source/core/layout/ColumnBalancer.cpp
@@ -33,15 +33,15 @@ void ColumnBalancer::traverseSubtree(const LayoutBox& box)
                 break;
             examineLine(*line);
         }
-        return;
     }
 
     const LayoutFlowThread* flowThread = group().columnSet().flowThread();
     bool isHorizontalWritingMode = flowThread->isHorizontalWritingMode();
 
-    // Look for breaks between and inside children.
+    // Look for breaks between and inside block-level children. Even if this is a block flow with
+    // inline children, there may be interesting floats to examine here.
     for (const LayoutObject* child = box.slowFirstChild(); child; child = child->nextSibling()) {
-        if (!child->isBox())
+        if (!child->isBox() || child->isInline())
             continue;
         const LayoutBox& childBox = toLayoutBox(*child);
         LayoutRect overflowRect = childBox.layoutOverflowRect();