A Boolean that indicates that events of this type will be dispatched to the registered listener before being dispatched to any EventTarget beneath it in the DOM tree.
A Boolean indicating that the listener should be invoked at most once after being added. If it is true, the listener would be removed automatically when it is invoked.
A Boolean indicating that the listener will never call preventDefault(). If it does, the user agent should ignore it and generate a console warning.
Available only in code running in XBL or in Firefox's chrome, it is a Boolean defining if the listener is added to the system group.
A Boolean that indicates that events of this type will be dispatched to the registered listener before being dispatched to any EventTarget beneath it in the DOM tree.
Available only in code running in XBL or in Firefox's chrome, it is a Boolean defining if the listener is added to the system group.
A Boolean indicating that the listener should be invoked at most once after being added.
A Boolean indicating that the listener should be invoked at most once after being added. If it is true, the listener would be removed automatically when it is invoked.
A Boolean indicating that the listener will never call preventDefault().
A Boolean indicating that the listener will never call preventDefault(). If it does, the user agent should ignore it and generate a console warning.
An options object that specifies characteristics about the event listener. The available options are: