Ian Hickson wrote:
On Tue, 28 Apr 2009, John J. Barton wrote:
Hi. I work on Firebug, a web page debugger for Firefox 

In attempting to show developers relevant information about all objects 
in their program I was trying to display window.sessionStorage. In the 
process I read the document http://dev.w3.org/html5/webstorage/. I found 
the document unnecessarily confusing because it uses the property 
'length' for Storage. This is the same property used by Javascript Array 
type, but Storage is not an array and you cannot enumerate the elements 
of the Storage object |s| using
  for(var i = 0; i < s.length; i++)...

This is in fact possible.
Sorry, I don't follow what you mean. The loop is possible of course, but what should the result be? If I have a sessionStorage object |s| with 10 items, the length will be 10. Should I expect |s[i]| for i=0,..., 9?  If so what will be the result, keys? items? Can I set values, eg s[2] = "howdy"?
Using the term "enumeration" to mean "property enumeration" is also 
confusing, but I suppose ECMA script made that mistake too long ago.

I'm just following WebIDL's terminology here.
Actually I take it back. The current document at the URL above only uses enumerating once, and there is qualified by properties. I was given a quote from an earlier document I suppose.