Re: [webcomponents] [Custom]: Clarify in informative note that cloning/importing also enqueues created callback (bugzilla: 28092) (#144)

I think since this spec is just a giant monkeypatch anyway we should define the IDL syntax here (and any monkeypatches to use it, unless we want to move those sooner rather than later). We can move it into IDL as part of the larger merge effort.

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