Re: [ServiceWorker] Capture Window Client cannot use attributes/methods directly (#633)

You mean it can be influenced by `Function.prototype.call(this, ...)` or something like that?

Could you let me know what would be a good practice for example? Like for the `hadFocus()` method referred to in this algorithm, is it a right way to specify the same steps [defined in HTML](https://html.spec.whatwg.org/multipage/interaction.html#dom-document-hasfocus) as-is? Or any better way?

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