[w3ctag/design-reviews] Incubation: Platform-provided behaviors for custom elements (Issue #1219)

anaskim created an issue (w3ctag/design-reviews#1219)

### Explainer

https://github.com/MicrosoftEdge/MSEdgeExplainers/tree/main/PlatformProvidedBehaviors

### The explainer

- [x] Includes the information requested by the [Explainer Explainer](https://w3ctag.github.io/explainer-explainer/#introduction).
- [x] Follows the [Web Platform Design Principles](https://www.w3.org/TR/design-principles/).
- [x] Includes or links to answers to the [Security/Privacy Questionnaire](https://www.w3.org/TR/security-privacy-questionnaire/).
- [x] Describes user research you did to validate the problem and/or design.

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

- GitHub repo: https://github.com/MicrosoftEdge/MSEdgeExplainers/tree/main/PlatformProvidedBehaviors
- Primary contacts:
  - Ana Sollano Kim @anaskim, Microsoft, engineering/specification
  - Dan Clark @dandclark, Microsoft, tech lead
  - Leo Lee @leolee, Microsoft, team lead
  - Andy Luhrs @aluhrs13, Microsoft, product

- Organization/project driving the design: Microsoft
- This work is being funded by: Microsoft
- Incubation and standards groups that have discussed the design:
  - https://github.com/whatwg/html/issues/12150
- Standards group(s) that you expect to discuss and/or adopt this work when it's
  ready: WHATWG


### Feedback so far

- Multi-stakeholder feedback:
  - Chromium comments: [Prototyping](https://chromestatus.com/feature/6035800057839616)
  - Mozilla comments: https://github.com/mozilla/standards-positions/issues/1380
  - WebKit comments: https://github.com/WebKit/standards-positions/issues/642
  - Developers are [supportive](https://docs.google.com/document/d/1eU_c4_fQ1yVSm8mjjfuqd1wWN9T8z2N6dr4XIwMv9uM/edit?usp=sharing)
- Major unresolved issues with or opposition to this design: none so far


### You should also know that...

_No response_

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