Re: [whatwg/dom] A faster way to find open shadow roots (or shadow hosts) (#665)

@TakayoshiKochi would it be easier or have you consider start creating the abstraction in selenium/webdriver rather than directly adding new things to the spec? 

We could introduce new primitives like `findAndExpandShadows()` where internally we can implementing a traversal with whatever primitives we need.

We (salesforce) will be happy to drive the spec changes on that front since we already maintain and contribute to some of the implementations.

We believe adding something on the HTML/CSS might not be the right first start since we would want to gather the exact use cases first without introducing any new shadow/WC introspection.


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