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2.3.1 [WEBSTG] Section 4.1, The Storage interface

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E0001:

The specification states

 4.1 The Storage interface
  
 IDLinterface Storage {
   readonly attribute unsigned long length;
   DOMString? key(unsigned long index);
   getter DOMString getItem(DOMString key);
   setter creator void setItem(DOMString key, DOMString value);
   deleter void removeItem(DOMString key);
   void clear();
 };

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The Storage interface has a remainingSpace attribute:

 Storage implements MSStorageExtensions;
   [NoInterfaceObject]
   interface MSStorageExtensions
     {
       readonly attribute unsigned long remainingSpace;
     };