Created attachment 206802 [details] screencast for this bug sorry, it is hard to explain, but -- if you will attach click handler to parent dom node -- and than on mousedown you will move a bit inner dom node -- so text node of this inner dom node, i assume, becomes like a mouseup target — than no click triggered i attached a vide and a link to jsFiddle, that represent a bug tested only on mac (Safari 6.0.5 (8536.30.1), WebKit nightly 152685, Chrome 28.0.1500.71)
same bug posted to chromium https://code.google.com/p/chromium/issues/detail?id=260797
found workaround: http://jsfiddle.net/fwHn5/1/ to add pointer-events: none; to inner dom-node