We've been working on the Topics API that allows for interest-based advertising in a browser ecosystem in which storage is partitioned by top-frame site. This API replaces our first proposal in this area, FLoC. We would like to hear what you think about it. Note that Chrome is implementing (with spec following shortly after) but we're quite open to evolving the API over time and are appreciative of your feedback.

explainer: https://github.com/jkarlin/topics

chromestatus: https://chromestatus.com/feature/5680923054964736

spec: TBD

Thank you,

Josh