Re: [w3c/ServiceWorker] Unnecessary Origin Restriction (Issue #1628)

The thing you're asking for is different to the quoted text. You want a fetch from origin A to go via the service worker at origin B, whereas the quoted text is about a service worker at origin A controlling origin B.

Iframes mean you can embed one site within another, and postMessage allows communication between the two.

However, Firefox and Safari create a new origin for the iframed page when it's iframed in another origin, as it makes it harder for the two origins to share data about the user. I imagine Chrome will adopt a similar policy at some point. So, you'll likely need to use https://developer.mozilla.org/en-US/docs/Web/API/Document/requestStorageAccess

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