https://chromeenterprise.google/intl/en_au/policies/shared-worker-extended-lifetime-enabled/
SharedWorkerExtendedLifetimeEnabled: Enable extended lifetime for SharedWorkers | Chrome Enterprise
SharedWorkers can have an extended lifetime if the "extendedLifetime" option is set to true in the SharedWorker constructor. If this policy is set to Enabled...
enableextendedlifetimechromeenterprise
https://lists.w3.org/Archives/Public/public-webappsec/2013Sep/0085.html
Re: [whatwg] [Workers] CSP and SharedWorkers from Ian Hickson on 2013-09-30...