+1
For Devtools nsIEventListenerInfo need to be updated. On 07/20/2016 03:53 PM, Xidorn Quan wrote:
Summary: "once" is a new option for EventTarget.addEventListener (as a member of AddEventListenerOptions dictionary), which means that the added listener should only be invoked once. It is something libraries like jQuery have been providing for years. And it would make writing certain type of tests much easier. Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1287706 Link to standard: https://dom.spec.whatwg.org/#dom-addeventlisteneroptions-once Platform coverage: all Estimated or target release: Firefox 50 or 51 Preference behind which this will be implemented: no pref. It is a small feature which I don't think needs a pref. DevTools bug: Not filed yet. DevTools may want to display whether an event listener is a once listener. - Xidorn
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