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		keyCode of type unsigned long, readonly 
keyCode holds a system- and implementation-dependent numerical code signifying the unmodified identifier associated with the key pressed. Unlike the KeyboardEvent.key or KeyboardEvent.char attributes, the set of possible values are not normatively defined in this specification; typically, these value of the keyCode should represent the decimal codepoint in ASCII [RFC20][US-ASCII] or Windows 1252 [WIN1252], but may be drawn from a different appropriate character set. Implementations that are unable to identify a key use the key value '0'. 
 
See Legacy key models for more details on how to determine the values for keyCode. 
 
which of type unsigned long, readonly 
which holds a system- and implementation-dependent numerical code signifying the unmodified identifier associated with the key pressed. In most cases, the value is identical to keyCode.
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devote, приведённая фраза, из которой был сделан вывод, распространяется и на keyCode, видимо поправка ниже, как представленную информацию правильно осмыслить