diff --git a/dom/events/PhysicalKeyCodeNameList.h b/dom/events/PhysicalKeyCodeNameList.h
index c8da7523e266..8f5e954def88 100644
--- a/dom/events/PhysicalKeyCodeNameList.h
+++ b/dom/events/PhysicalKeyCodeNameList.h
@@ -204,13 +204,32 @@ DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(VolumeMute)
 DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(VolumeUp)
 DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(WakeUp)
 
-// Legacy keys
-// DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Abort)
+// Legacy Keys and Non-Standard Keys
+
+// Legacy modifier keys
 // DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Hyper)
-// DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Resume)
 // DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Super)
-// DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Suspend)
 // DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Turbo)
 
+// Legacy process control keys
+// DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Abort)
+// DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Resume)
+// DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Suspend)
+
+// Legacy editing keys
+DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Again)
+DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Copy)
+DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Cut)
+DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Find)
+DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Open)
+DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Paste)
+DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Props)
+DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Select)
+DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Undo)
+
+// International keyboards
+// DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Hiragana)
+// DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME(Katakana)
+
 #undef DEFINE_PHYSICAL_KEY_CODE_NAME_WITH_SAME_NAME
 #undef NS_DEFINE_PHYSICAL_KEY_CODE_NAME_INTERNAL