title: MouseEvent.path equivalent in Firefox & Safari
body: <p>I'm using Polymer 1.0 and when there is a click on a button in Chrome a <code>MouseEvent</code> is generated. This <code>MouseEvent</code> object has a <code>path</code> property which is an ordered array of parent elements to the clicked button. In Firefox &amp; Safari, however, a <code>click</code> is generated which does not have a <code>path</code> property. Is there an equivalent property of the <code>click</code> object which gives me the same information?</p>