Permissions to observe topics in page head and body #224
Description
Add two permissions, default none, for sites to allow training on the HTML head (including title) and body elements.
- Permissions-Policy: browsing-topics-observe-head
- Permissions-Policy: browsing-topics-observe-body
This would address the problem of sensitive titles and other page content covered in #118 while still allowing large, general-interest sites to contribute fairly to Topics API audience data collection.