--- a/layout/base/PresShell.cpp
+++ b/layout/base/PresShell.cpp
@@ -7316,18 +7316,31 @@ PresShell::HandleEvent(nsIFrame* aFrame,
                (aEvent->mClass == eMouseEventClass) ||
                (aEvent->mClass == eWheelEventClass)) {
       retargetEventDoc = GetPrimaryContentDocument();
 #endif
     }
 
     if (retargetEventDoc) {
       nsCOMPtr<nsIPresShell> presShell = retargetEventDoc->GetShell();
-      if (!presShell)
-        return NS_OK;
+      // Even if the document doesn't have PresShell, i.e., it's invisible, we
+      // need to dispatch only KeyboardEvent in its nearest visible document
+      // because key focus shouldn't be caught by invisible document.
+      if (!presShell) {
+        if (!aEvent->HasKeyEventMessage()) {
+          return NS_OK;
+        }
+        while (!presShell) {
+          retargetEventDoc = retargetEventDoc->GetParentDocument();
+          if (!retargetEventDoc) {
+            return NS_OK;
+          }
+          presShell = retargetEventDoc->GetShell();
+        }
+      }
 
       if (presShell != this) {
         nsIFrame* frame = presShell->GetRootFrame();
         if (!frame) {
           if (aEvent->mMessage == eQueryTextContent ||
               aEvent->IsContentCommandEvent()) {
             return NS_OK;
           }