[Bug 21485] [Custom]: Consider possible candidates of element upgrade

https://www.w3.org/Bugs/Public/show_bug.cgi?id=21485

--- Comment #8 from Boris Zbarsky <bzbarsky@mit.edu> ---
The point is that throwing during the middle of adoption is really bad, so you
have to throw _before_ you start adopting, which means you need to prescan for
custom elements or something.

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Received on Monday, 1 April 2013 17:54:14 UTC