[w3ctag/design-reviews] Incubation: Custom Highlight API Extensions (Issue #1304)

kbabbitt created an issue (w3ctag/design-reviews#1304)

### Explainer

https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/highlight-v2/explainer.md

### 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/).
- [ ] 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?

- Primary contacts:
  - Kevin Babbitt (@kbabbitt), Microsoft, explainer author and Chromium feature owner
- Organization/project driving the design: Microsoft Edge
- This work is being funded by: Microsoft
- Incubation and standards groups that have discussed the design:
  - CSS WG: https://github.com/w3c/csswg-drafts/issues/14613
- Standards group(s) that you expect to discuss and/or adopt this work when it's ready: CSS WG

### Feedback so far

- Multi-stakeholder feedback:
  - Chromium: Prototyping ([Intent to Prototype](https://groups.google.com/a/chromium.org/d/msgid/blink-dev/DS0PR00MB1925469973435239690829EDC0762%40DS0PR00MB1925.namprd00.prod.outlook.com))
  - Mozilla: https://github.com/mozilla/standards-positions/issues/1480
  - WebKit: https://github.com/WebKit/standards-positions/issues/740
- Major unresolved issue: How to vary styles among ranges within one highlight (`getRangeStyle()` or `range-index()`) is still under discussion in w3c/csswg-drafts#14613. We anticipate prototyping will help inform the answer to this question. Other open questions are tracked in the [explainer repo](https://github.com/MicrosoftEdge/MSEdgeExplainers/labels/CustomHighlightAPIExtensions).

### You should also know that...

This extends CSS Custom Highlight API Level 1, which the TAG reviewed in #584. We'd particularly welcome input on `getRangeStyle()` versus `range-index()`.

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