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Explain credentials on automatic beacons until 3PCD #884

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Nov 9, 2023
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2 changes: 2 additions & 0 deletions Fenced_Frames_Ads_Reporting.md
Original file line number Diff line number Diff line change
Expand Up @@ -250,6 +250,8 @@ window.fence.setReportEventDataForAutomaticBeacons({
});
```

When 3rd party cookies are enabled, automatic beacon requests only (not beacons sent manually through `reportEvent`) allow credentials (cookies) to be set in headers. This was requested by https://github.com/WICG/turtledove/issues/866 in order to help with migration. These requests are subject to CORS and only occur after opt-in by virtue of calling the `setReportEventDataForAutomaticBeacons` API.
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# Support for Ad Components
For ad components [rendered in fenced frames](https://github.com/WICG/turtledove/blob/main/FLEDGE.md#4-browsers-render-the-winning-ad), the support for event-level reporting described below is available in Chrome starting M114.
For ad components rendered in iframes, the support will be available in Chrome starting M115. The support works for all combinations of the top-level ad and ad component being rendered in iframes and/or Fenced Frames.
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