Re: [whatwg/dom] Capturing event listeners are called during bubbling phase for shadow hosts (#685)

> FWIW, Gecko has used the model where capturing listeners get call before bubble listeners on host
(where host can be for example input element) at least for 12 years.

As far as I can tell, this oddly ordered invocation of capturing event listener isn't observable when there is no author-defined shadow tree. So I think the compat risk with content which uses `attachShadow` is real since WebKit and Blink always shipped this odd event dispatching behavior.

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