Obsolete since Gecko 24 (Firefox 24 / Thunderbird 24 / SeaMonkey 2.21)
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
The Window method routeEvent(), which is obsolete and no longer available, used to be called to forward an event to the next object that has asked to capture events.
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https://developer.mozilla.org/en-US/docs/Web/API/window/routeEvent