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

> There's no need for a component that uses another interactive components to reach into its shadow tree.

I disagree. For full integration tests, I need to click and interact with elements just like the user would. I frequently have form elements, anchors and other interactive elements inside a shadow tree. The alternative is using selenium to click on specific offsets in the viewport - and that is extremely fragile.

> That should already work. ShadowRoot.prototype.querySelector and ShadowRoot.prototype.querySelectorAll already exist.

It does - but it's very verbose and difficult to work with. Authors want the convenience that the shadow piercing combinator provided. This problem really only exists because selenium locates elements based on query selectors. It's cumbersome to use shadow dom in that environment.

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