Re: [w3c/ServiceWorker] <object> having issue with service workers registration, failing with error message Service worker registration failed with: DOMException: Failed to register a ServiceWorker: The document is in an invalid state. (#1546)

Service worker should be used for iframes, so please file a bug if that isn't working (although, be aware that some browsers use third party isolation for cross origin iframes)

As for embed/object, it's unsafe to intercept those, as some plugins do not use the same security model as the web (eg Flash) https://w3c.github.io/ServiceWorker/#implementer-concerns

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