Re: [w3c/ServiceWorker] should document.open() inherit the controller? (#1313)

>From a developer's point of view, I believe most of developer want to keep current environment if they wrote `document.open`, and want to **patch** something instead of recreate for all.

At lease, all the global vars/functions are preserved, and the code may depend on the **inherit** behavior if they depend on some features in the global env.

For me, the global env should include both window & document & service worker, but I don't read the specs deeply, maybe mismatched with that.



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