Re: [w3c/webcomponents] [feature request] change when upgrade/connected happens during parsing, so that it is the first event in the following microtask (#787)

Or just check [isConnected](https://dom.spec.whatwg.org/#dom-node-isconnected). Note that it would return `false` in `disconnectedCallback`.

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Received on Thursday, 31 January 2019 03:59:20 UTC