https://caniuse.com/mdn-api_fetchevent_respondwith_resource_url
FetchEvent API: respondWith: Change in behavior when specifying the final URL of a resource. | Can...
"Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.
https://developer.mozilla.org/en-US/docs/Web/API/FetchEvent/resultingClientId
FetchEvent: resultingClientId property - Web APIs | MDN
The resultingClientId read-only property of the FetchEvent interface is the id of the client that replaces the previous client during a page navigation.
web apispropertymdn
https://lists.w3.org/Archives/Public/public-payments-wg/2016Feb/0265.html
Re: [paymentrequest] Change the PaymentRequestUpdateEvent model to better match FetchEvent (#50)...
change
https://bugzilla.mozilla.org/show_bug.cgi?id=1222464
1222464 - Implement FetchEvent.clientId and clients.get(id)
RESOLVED (ehsan.akhgari) in Core - DOM: Service Workers. Last updated 2016-01-05.
implementclientsgetid