Re: [w3c/webcomponents] Is or how can Shadow DOM be 'SEO friendly'? (#500)

My general advice here:

- If components are well designed, crawler do not need a flattened tree to get text contents.
- Good search-engine friendly components would enable component users to specify text contents in a place of component's children, as  *crawlable* text contents*, rather than embedding hard-coded text contents in their shadow trees.

e.g.
```
<good-components>hello world</good-components>
```
```
<bad-components></bad-components>  //  "hello world" is hard-coded in its shadow tree.
```

Humans might see "hello world" in both cases, but the former is search-engine friendly, I think.
Thus, it's up-to component developers. If every components are well-designed, every important text information can be put in top HTML.

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