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At: http://dev.w3.org/2006/webapi/WebIDL/#es-sequence The spec says "Let length be one greater than V’s maximum indexed property index, if V is a platform object that supports indexed properties or the result of calling [[Get]] on V with property name “length” otherwise" Is there any object that is a platform object that supports indexed properties but does not have a length property? Is there a use case for not mandating that such objects have a length property?
https://www.w3.org/Bugs/Public/show_bug.cgi?id= *** This bug has been marked as a duplicate of bug 20561 ***