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Re: [csswg-drafts] [css-selectors] new pseudo class that matches shadow hosts (#2908)

From: Westbrook Johnson via GitHub <sysbot+gh@w3.org>
Date: Thu, 06 May 2021 15:36:18 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-833621630-1620315376-sysbot+gh@w3.org>
How would we expect something like this to work with an element that has a shadow root as applied by the user agent?

![Image of the User Agent applied shadow root for an input element](https://user-images.githubusercontent.com/1156657/117324778-1c4e8980-ae5e-11eb-9a9d-8dd263968b52.png)

Similarly, would we expect this pseudo class to work differently between open and closed shadow roots? Is a user agent shadow root technically closed, anyways?

I do like the idea that it supports better collection of elements with shadow roots. Having this capability also make me feel like there's some glimmer of a possibility that 3rd party tools (Hotjar style analytics, ARC toolkit style extensions, etc.) would be more eager to expand their coverage to sites that leverage shadow DOM by reducing the tree walking needed to activate their features in that context.

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