javascript - onkeydown works on some websites and on some it doesn't -

i trying set keyboard shortcuts gmail. use tampermonkey , onkeydown function. found out gmail special website, because found on many websites approach works, not on gmail. tried these 3 options, none work. suggest?

   // @match        https://mail.google.com // have line 

option 1

    document.onkeydown = keydown;     function keydown(evt){               console.log("hhwhehehheeheh");     } 

option 2

    document.documentelement.onkeydown = keydown;     function keydown(evt){               console.log("hhwhehehheeheh");     } 

option 3

document.body.focus();     document.documentelement.onkeydown = keydown;     function keydown(evt){               console.log("hhwhehehheeheh");     } 

your option 1 correct, problem pattern: // @match https://mail.google.com

use follow pattern instead: // @match https://mail.google.com/*

the problem pattern fits https://mail.google.com without path, gmail content not served https://mail.google.com it's use location path https://mail.google.com/mail/... have add * pattern in order load script.

using second 1 @match script work me:

// ==userscript== // @name         new userscript // @namespace    http://tampermonkey.net/ // @version      0.1 // @description  try take on world! // @author       // @match        https://mail.google.com/* // @grant        none // ==/userscript== /* jshint -w097 */ 'use strict';  document.onkeydown = keydown; function keydown(evt){     console.log("hhwhehehheeheh"); } 

see @match more details

hope helps,