Google's Fenced Frames loads ads in a separate container that dissociates information within the container from the parent page.
Fenced Frames are designed to address short comings in other Privacy Sandbox proposals, such as providing support for:
- Interest Based Advertising
- Conversion Lift measurement studies
- Granting unpartitioned storage access without impairing user experience via a permission prompt
- Cross-site embedded content
By removing communication between the container and the parent page, publishers lose monitoring and control over this content.