[w3ctag/design-reviews] WG Revision: CSSPseudoElement (Issue #1233)

danielsakhapov created an issue (w3ctag/design-reviews#1233)

### Specification

https://drafts.csswg.org/css-pseudo-4/#CSSPseudoElement-interface

### Explainer

https://github.com/danielsakhapov/CSSPseudoElementDoc

### Links

- The WG's request for this TAG review: https://groups.google.com/a/chromium.org/g/blink-dev/c/CB44320ip2E/m/s9JMCrqDBgAJ
- A description of what has changed since our previous review: CSSPseudoElement is no longer inheriting from EventTarget, instead it participates in event handling as Event.pseudoTarget which is CSSPseudoElement?

Feature 1:
- A description of the problems that end-users were facing before this proposal: no support for pseudo-elements in JS
- Examples of how to use the proposal to solve the end-users' problems: https://github.com/danielsakhapov/CSSPseudoElementDoc#use-cases
- Web Platform Tests:  https://wpt.fyi/css/css-pseudo?q=CSSPseudoElement, https://wpt.fyi/css/css-pseudo?q=events-on


### The specification

- [x] Follows the [Web Platform Design Principles](https://www.w3.org/TR/design-principles/).
- [x] Includes Security and Privacy Considerations sections based on answers to the [Security/Privacy Questionnaire](https://www.w3.org/TR/security-privacy-questionnaire/).

### Where and by whom is the work is being done?

- GitHub repo: https://github.com/w3c/csswg-drafts/blob/main/css-pseudo-4/Overview.bs
- Primary contacts:
  - Daniil Sakhapov (@danielsakhapov), Google
- Organization/project driving the specification: CSSWG
- Primary standards group developing this feature: CSSWG


### Feedback so far

I'm mostly requesting this review as I was asked in Intent to Ship process here - https://groups.google.com/a/chromium.org/g/blink-dev/c/CB44320ip2E/m/s9JMCrqDBgAJ - not sure if it even needs reviewing or can be just FYI even? PTAL


### You should also know that...

https://github.com/danielsakhapov/CSSPseudoElementDoc - has links to some open issues on CSSPseudoElement interface

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