Re: [w3c/webcomponents] Should custom elements be adoptable if so, how? (#512)

> (I would expect Gecko to simply clone the document.)

For what it's worth, the clone Gecko performs for printing is a pretty special clone (e.g. when cloning a canvas we clone the actual image in the canvas, which is not the normal canvas cloning behavior).  We also don't really want to run script during this clone, I'm pretty sure.   And the clone is not exposed to script, so doesn't have detectable prototypes to start with.  So I don't think we should really block the discussion here on the clone-for-printing Gecko does.

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