Re: [w3c/webcomponents] What happens in these slot/content scenarios? (#508)

There's no way to serialise a shadow root from HTML (yet) so you can make the following assumptions:

- The element will exist before its shadow root is created
- The element may, or may not, have light DOM when the shadow root is created
- The shadow root will be created without any slots (i.e. slots will always be added after it's created)

You also make the following assumptions in all scenarios:

- All nodes added to a shadow host become light DOM and are reported by `childNodes`
- Nodes added to a shadow host may or may not be slotted (i.e. appear in the composed tree)
- Slots are slotted in tree order

Those things accounted for:

- When you add a shadow root, the light DOM has nowhere to be slotted yet and will not be in the composed tree
- When you add a slot to the shadow root (by any means, including `innerHTML`) it will run the slotting algorithm if any light DOM exists
- When you add light DOM, the slotting algorithm is run on the new node. If it cannot be slotted, it's still a child of the host, but does not appear in the composed tree.


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