Adding or changing any of box-shadow, outline, or border-image-outset does not need a layout..

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

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2009, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 383 matching lines @@
 
     const char* name() const override { return "LayoutTable"; }
 
     // Whether a table has opaque foreground depends on many factors, e.g. border spacing, missing cells, etc.
     // For simplicity, just conservatively assume foreground of all tables are not opaque.
     bool foregroundIsKnownToBeOpaqueInRect(const LayoutRect&, unsigned) const override { return false; }
 
 protected:
     void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;
     void simplifiedNormalFlowLayout() override;
+    bool recalcChildOverflowAfterStyleChange() override;
     PaintInvalidationReason invalidatePaintIfNeeded(const PaintInvalidationState&) override;
     void invalidatePaintOfSubtreesIfNeeded(const PaintInvalidationState&) override;
 
 private:
     bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectTable || LayoutBlock::isOfType(type); }
 
     void paintObject(const PaintInfo&, const LayoutPoint&) const override;
     void layout() override;
     void computeIntrinsicLogicalWidths(LayoutUnit& minWidth, LayoutUnit& maxWidth) const override;
     void computePreferredLogicalWidths() override;
@@ skipping 100 matching lines @@
     if (m_firstBody)
         return m_firstBody;
     return m_foot;
 }
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutTable, isTable());
 
 } // namespace blink
 
 #endif // LayoutTable_h