Contact emails carai...@chromium.org
pauljen...@chromium.org Summary The Protected Audience API provides 2 mechanisms that allow signals to be passed into auctions in such a way that ensures the authenticity and integrity of the signals: the original version <https://github.com/WICG/turtledove/blob/main/FLEDGE.md#251-using-subresource-bundles>, which used subresource web bundles <https://github.com/WICG/webpackage/blob/main/explainers/subresource-loading.md> to contain the signals, and the subsequent version <https://github.com/WICG/turtledove/blob/main/FLEDGE.md#252-using-response-headers>, which used special HTTP response headers on page-initiated fetch() requests. This deprecation and removal is only for the original, subresource web bundle version, and does not affect the response header version. Use counter metrics <https://chromestatus.com/metrics/feature/timeline/popularity/5034> show the feature is used on less than 1 in 500 million page loads. Deprecating and removing the original subresource web bundle version of directFromSellerSignals will improve code health and remove potential attack surfaces. Motivation Removing this unused feature will remove potential attack surface and reduce maintenance burden. Interoperability and Compatibility Risk Edge: not supported (Edge’s Ad Selection API <https://github.com/WICG/privacy-preserving-ads>, which is similar to the Protected Audience API, only supports on-server auctions which don’t use directFromSellerSignals) Firefox: not supported Safari: not supported Alternative implementation suggestion for web developers The header-based directFromSellerSignals <https://github.com/WICG/turtledove/blob/main/FLEDGE.md#252-using-response-headers> provides the same functionality via a different mechanism. Usage information from UseCounter <https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/core/page/UseCounter.h&sq=package:chromium&type=cs&q=file:UseCounter.h%20Feature&l=39> This feature is used on less than 1 in 500 million page loads: https://chromestatus.com/metrics/feature/timeline/popularity/5034 Entry on the feature dashboard <https://www.chromestatus.com/> https://chromestatus.com/feature/4926509595492352 -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CABQTWrm2zO7GX%2B88wwj_nZ9N_LUX2P_%2BhhD3t3uAfvMFm73%3D9g%40mail.gmail.com.
