GPT-guides-cross-origin-embedder-policy Ad Manager docs
Google Publisher Tag (GPT) currently doesn't support pages using Cross-Origin-Embedder-Policy (COEP) due to restrictions on cross-origin embedding. Publishers affected by Chrome's SharedArrayBuffer deprecation are recommended to opt out using the reverse Origin Trial until GPT supports COEP. SharedArrayBuffer is being restricted due to security concerns, prompting Chrome to require COEP for its usage. GPT's lack of COEP support stems from the need for extensive changes across all ad resources, both Google's and third-party's, to explicitly opt into cross-origin embedding. Chrome offers a per-s
5,362 characters of text.