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http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html#keys-Guide said that: 2.2 If there is no appropriate key value in the key values set, then a key value must be devised. I think that any browser vendors shouldn't name undefined key name by D3E spec because it may cause different implementation between browsers. Browser vendors should file a spec bug for requesting to register new key name to the spec, first.
When you agree with this idea, you need to change the document here: http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html#key-values
Fixed in ED by removing the section that requires browser vendors to make up their own 'key' values.