Measure the usage of <ol>.start with |reversed| and no |start| attribute.

third_party/WebKit/Source/core/html/HTMLOListElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 15 matching lines @@
 #include "core/html/HTMLElement.h"
 
 namespace blink {
 
 class HTMLOListElement final : public HTMLElement {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   DECLARE_NODE_FACTORY(HTMLOListElement);
 
-  int start() const {
-    return has_explicit_start_ ? start_ : (is_reversed_ ? ItemCount() : 1);
-  }
+  int start() const;
   void setStart(int);
 
   bool IsReversed() const { return is_reversed_; }
 
   void ItemCountChanged() { should_recalculate_item_count_ = true; }
 
  private:
   explicit HTMLOListElement(Document&);
 
   void UpdateItemValues();
@@ skipping 16 matching lines @@
   unsigned item_count_;
 
   bool has_explicit_start_ : 1;
   bool is_reversed_ : 1;
   bool should_recalculate_item_count_ : 1;
 };
 
 }  // namespace blink
 
 #endif  // HTMLOListElement_h