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dmarti robinberjon pdolanjski Yeah, the issue is having the browser preset that window level function or string isn't a guarantee to cover every use case depending on how the on-page functions leverage accessing the string. Specifically in the case of a postMessage.
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dmarti robinberjon pdolanjski I think the optimal situation would be the __window.uspapi function to have a tool to set the uspString from a browser or extension. It would mean IAB changing the spec to support that behavior though, and that feels unlikely. However, I'd personally be interested in a discussing