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See <http://software.hixie.ch/utilities/js/live-dom-viewer/saved/2201>.
I'm wondering whether this should actually be a spec. bug at all. Isn't this bug better logged in Bugzilla for the Mozilla project? Unless you think this behavior is specified incorrectly?
I haven't investigated what other implementations do; if Gecko is alone, I expect we'd be happy to change.
+ sicking I think Gecko's behavior is wrong, unless sicking thinks the spec. is wrong.
I filed https://bugzilla.mozilla.org/show_bug.cgi?id=906897 which shows that there was a bug in Firefox to *explicitly* throw. But this behavior is not shared by Chrome and Safari. I'm think Fx has a bug here.
Marking this as INVALID. The bug is a Gecko bug. The above bug report carries the history of it. I believe a patch needs to be backed out.