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http://dom.spec.whatwg.org/#interface-eventtarget [[ When set to true, the capture argument ensures callback is only invoked when the event's eventPhase attribute value is CAPTURING_PHASE. ]] This non-normative text contradicts the normative requirements.
https://github.com/whatwg/dom/commit/196cfd52e0c05a31228e2d49cc17fa6f9ab9cf22