[w3ctag/design-reviews] Incubation: Preventing User Dictionary Leaks via ::spelling-error and ::grammar-error CSS Pseudo-Elements (Issue #1148)

arichiv created an issue (w3ctag/design-reviews#1148)

### Explainer

https://explainers-by-googlers.github.io/user-dictionary-leaks/

### 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/explainers-by-googlers/user-dictionary-leaks
- Primary contacts:
  - @arichiv, Google Chrome
  - @arturjanc, Google Chrome
- Organization/project driving the design: Google Chrome
- This work is being funded by: Google
- Incubation and standards groups that have discussed the design:
  - https://github.com/privacycg/meetings/issues/42
- Standards group(s) that you expect to discuss and/or adopt this work when it's
  ready: Privacy CG


### Feedback so far

- Multi-stakeholder feedback:
  - Chromium comments: https://crbug.com/415712674, https://groups.google.com/a/chromium.org/g/blink-dev/c/vF5Uc8Ltga8
  - Mozilla comments: https://github.com/mozilla/standards-positions/issues/1294
  - WebKit comments: https://github.com/WebKit/standards-positions/issues/546


### You should also know that...

We want to prevent websites from extracting information about a user’s dictionary using CSS spelling/grammar hint highlights. This is currently possible by making a text field with a repeated (misspelled) word autofocus and monitoring rendering performance to notice when highlighting occurs.

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