CS of out-of-flow positioned objects should have is_new_fc == true

third_party/WebKit/Source/core/layout/ng/ng_space_utils.cc

Index: third_party/WebKit/Source/core/layout/ng/ng_space_utils.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_space_utils.cc b/third_party/WebKit/Source/core/layout/ng/ng_space_utils.cc
index 4c8143b0da7fa63c5812017555a174c167f47114..d63d5e735af824d58c93b3ab1c90a835c1aa3770 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_space_utils.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_space_utils.cc
@@ -19,11 +19,14 @@ WTF::Optional<T> OptionalMax(const WTF::Optional<T>& value1,
   return value2;
 }
 
+bool IsOutOfFlowPositioned(const EPosition& position) {
+  return position == EPosition::kAbsolute || position == EPosition::kFixed;
+}
+
 }  // namespace
 
-bool IsNewFormattingContextForInFlowBlockLevelChild(
-    const NGConstraintSpace& space,
-    const ComputedStyle& style) {
+bool IsNewFormattingContextForBlockLevelChild(const NGConstraintSpace& space,
+                                              const ComputedStyle& style) {
   // TODO(layout-dev): This doesn't capture a few cases which can't be computed
   // directly from style yet:
   //  - The child is a <fieldset>.
@@ -31,6 +34,9 @@ bool IsNewFormattingContextForInFlowBlockLevelChild(
   //    in a multi-col formatting context).
   //    (https://drafts.csswg.org/css-multicol-1/#valdef-column-span-all)
 
+  if (style.isFloating() || IsOutOfFlowPositioned(style.position()))
+    return true;
+
   if (style.specifiesColumns() || style.containsPaint() ||
       style.containsLayout())
     return true;