How to check if a key is currently down ...

From	"R.Wieser" <address@not.available>
Newsgroups	comp.lang.javascript
Subject	How to check if a key is currently down ...
Date	2019-03-25 08:23 +0100
Organization	Aioe.org NNTP Server
Message-ID	<q79vlh$1li$1@gioia.aioe.org> (permalink)

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... without having to capture it thru an event first.

The reason I'm stating it like that is because I have the need to see if a 
certain key (preferrably the shift, alt, ctrl or similar) is down /when a 
webpage is being loaded/.

In short, I'm looking for a(n equivalent of) IsKeyCurrentlyDown method. 
Does such a beast exist ?

Regards,
Rudy Wieser

P.s.
For the off chance that it might make a difference: The script is actually a 
GreaseMonkey one.   I want to alter its behaviour (scrubbing less or more) 
depending on certain keys being pressed while loading a new page.

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How to check if a key is currently down ... "R.Wieser" <address@not.available> - 2019-03-25 08:23 +0100
  Re: How to check if a key is currently down ... Jonas Thörnvall <jonas.thornvall@gmail.com> - 2019-03-25 02:33 -0700
    Re: How to check if a key is currently down ... "R.Wieser" <address@not.available> - 2019-03-25 11:48 +0100
  Re: How to check if a key is currently down ... Jonas Thörnvall <jonas.thornvall@gmail.com> - 2019-03-25 02:39 -0700
  Re: How to check if a key is currently down ... Julio Di Egidio <julio@diegidio.name> - 2019-03-25 04:08 -0700
  Re: How to check if a key is currently down ... JJ <jj4public@vfemail.net> - 2019-03-25 19:42 +0700
    Re: How to check if a key is currently down ... "R.Wieser" <address@not.available> - 2019-03-25 17:21 +0100
    Re: How to check if a key is currently down ... Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-03-26 17:09 +0100
      Re: How to check if a key is currently down ... Jon Ribbens <jon+usenet@unequivocal.eu> - 2019-03-26 16:12 +0000
        Re: How to check if a key is currently down ... Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-03-26 17:35 +0100
          Re: How to check if a key is currently down ... Jon Ribbens <jon+usenet@unequivocal.eu> - 2019-03-26 16:48 +0000
            Re: How to check if a key is currently down ... Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-03-26 18:29 +0100
              Re: How to check if a key is currently down ... Jon Ribbens <jon+usenet@unequivocal.eu> - 2019-03-26 17:36 +0000
    Re: How to check if a key is currently down ... Julio Di Egidio <julio@diegidio.name> - 2019-03-26 18:23 -0700
  Re: How to check if a key is currently down ... Peter Büttner <not_for_mail_peb@gmx.net> - 2019-03-25 18:46 +0100
    Re: How to check if a key is currently down ... "R.Wieser" <address@not.available> - 2019-03-25 19:23 +0100
      Re: How to check if a key is currently down ... Peter Büttner <not_for_mail_peb@gmx.net> - 2019-03-27 19:26 +0100
        Re: How to check if a key is currently down ... "R.Wieser" <address@not.available> - 2019-04-05 09:23 +0200
          Re: How to check if a key is currently down ... Peter Büttner <not_for_mail_peb@gmx.net> - 2019-04-07 19:53 +0200

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