Re: [webcomponents] Custom elements disconnected from a document should not be upgraded (#419)

So let me try to understand the proposal:

1. Nodes inserted into the document that matches their registry, at the time of upgrade, will be upgraded.
2. Will nodes inserted past the time of upgrade, but created before the time of upgrade, still be upgraded, but only upon being inserted? I think if we don't do this we create race conditions.

It seems a little easier to just upgrade all of them and assume developers won't allocate a million of custom elements they don't intend to use.

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