Five Protected Audience (PA) and Fenced Frames (FF) features were shipped earlier this year but not enabled in the Chrome-facilitated testing Modes A and B to prevent disrupting experiments and measurements during the Chrome-facilitated testing period:
PA Real Time Reporting (I2S)
PA multi-bid support (I2S)
PA deprectedReplaceInURN via auction config (I2S)
PA multiple bidding contexts optimization (not web visible)
FF allow cross-origin subframes to send reportEvent() beacons (I2S)
With the end of the Chrome-facilitated testing period, we’re going to enable these features in Modes A and B to provide a more consistent developer experience and decrease the need for feature detection.