title: What the purpose of false in element.addEventListener(event, action, false)?
body: <p>From what I've understood reading about <strong><a href="https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener" rel="nofollow noreferrer">eventListener on MDN</a></strong> the third parameter is options, and across the network, I've seen people doing <code>(event, action)</code> and some do <code>(event, action, false)</code>.
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  What I wonder is in the situation where no option are used is fine to go with the first version or there is some downside in performance?</p>