Greetings webkit-dev, We have been working on Anonymous iframe, and we would appreciate your feedback. This is an attribute to the <iframe> element causing its document to be associated with a new and ephemeral context. It resolves a problem developers have using Cross-Origin-Embedder-Policy (COEP). It allows embedding <iframe> that do not use COEP. To achieve this, we rely on adding a nonce to the storage key used to access shared storage by anonymous iframe. As part of the client-side storage partitioning effort (declined across storage APIs, network state and Cookie State), See https://github.com/ArthurSonzogni/anonymous-iframe Thanks Arthur @arthursonzogni