Re: [webcomponents] slot element's fallback contents is never used (#317)

Thank you for the interests. I've supported "fallback contents" features at https://github.com/w3c/webcomponents/commit/96403c3b808aa581852497a25321440462351489.

The commit implies: Slots can be nested many times as fallback contents of *parent* slots. We can write the following markup:

```
 <slot name="a">
   <slot name="b">
      <slot name="c">
        <div>hello <slot name="d"></slot></div>
      </slot>
   </slot>
</slot>
```

- `<div>Hello <slot name="d"></slot></div>` is fallback contents of slot c.
- slot c is fallback contents of slot b
- slot b is fallback contents of slot a






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