void addEventListener(String type, EventListener listener, [bool useCapture]) { // TODO(leafp): This check is avoid a bug in our dispatch code when // listener is null. The browser treats this call as a no-op in this // case, so it's fine to short-circuit it, but we should not have to. if (listener != null) { _addEventListener(type, listener, useCapture); } }
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https://api.dartlang.org/stable/2.0.0/dart-html/EventTarget/addEventListener.html