Re: [webcomponents] Parse <slot> like <template> (#59)

So I'm trying to figure out when we need this complexity and it seems given the restrictions on `attachShadow()` that currently you can never get there. E.g., the original example is
```
<slot>
  <tr><td>...
</slot>
```
meaning the `slot` element's fallback is a row in a table. That means however that the shadow root's host must be a `thead` element (since only children are slotable) or a `table` element in an XHTML context. And neither of those is possible with the current `attachShadow()` restrictions.

I'm not opposed to changing the HTML parser so that this kind of thing will be possible in the future once `attachShadow()` becomes less restricted, but I would like everyone to sign of on changing the HTML parser to treat `template` and `slot` nearly identical as it is quite an invasive change that will take me a bit of time (I'm happy for someone else to volunteer too, but since @dglazkov's email in 2012 that doesn't seem to have happened...).

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