Daniel D. Beck

### What type of issue is this? Incorrect support data (example: BrowserX says "86" but support was added in "40") ### What information was incorrect, unhelpful, or incomplete? There are...

`Permissions-Policy` - Wrongly subsumes `Feature-Policy`

4

### What type of issue is this? Incorrect support data (example: BrowserX says "86" but support was added in "40") ### What information was incorrect, unhelpful, or incomplete? BCD records...

Add general `partial_implementation` guideline

6

#### Summary This PR provides a general guideline for setting `partial_implementation`. #### Related issues This continues a discussion started in https://github.com/mdn/browser-compat-data/pull/26605#issuecomment-2838278224.

Add behavioral subfeature data guideline

2

#### Summary This PR provides a general guideline for creating behavioral subfeatures. #### Related issues This continues a discussion started in https://github.com/mdn/browser-compat-data/pull/26605#issuecomment-2838278224, while https://github.com/mdn/browser-compat-data/pull/26780 covers the partial implementation part of...