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

The `<slot>` in the current Shadow DOM spec only says:
```
Context
  Where flow content is expected.
Content model
  Transparent
```

On the other hand, It looks `<template>` has a lot of details in categories, content models and so on: https://html.spec.whatwg.org/multipage/scripting.html#the-template-element

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