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robinberjon luk_wlodarczyk pbannist I was not aware of this specific change, but it doesn't surprise me. GAM has added features related to various testing proposals. I think GAM iFrames are set up to allow testing of private measurement for example. GAM is the gateway to this functionality so it would need to be.
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robinberjon luk_wlodarczyk pbannist That said, yeah, GAM & other ad tech vendors make changes all the time & don't notify sites. Example: I see a lot of prebid-loaded bidder scripts activating origin trial keys on publisher sites all the time. Presumably for other ad tech functionality being proposed and tested.
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robinberjon luk_wlodarczyk pbannist Also, Chrome has a Trust Token tab in the application tab of the developer's tools. So I assume people are out there testing that too.
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