Re: [w3c/webcomponents] Support `>>>` combinator in static profile (#78)

> Basically, we decided not to write tests that pierce across shadow boundaries.

That falls apart when you have interactive elements in shadow roots (like `<button>`). You end up writing public accessors just to test the component.

Having worked with this a lot (and being the author of a very popular gist on this subject), I don't want the shadow piercing combinator. What I do want is a selector that only works for testing that selects from the current element's shadow root:

```
document.querySelector('custom-element => button');
// Must be currently written as:
document.querySelector('custom-element').shadowRoot.querySelector('button');
```

However most of this could be easily overcome by syntactic sugar or special methods in testing frameworks.

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