javascript - Firefox keydown not working when page is initially loaded -

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this maybe no brainer you. trying figure out why keydown not triggered in firefox upon initial load. 

$(document).keydown(function(){alert("test")})

i add above code in javascript , when open page , without clicking pressing key. can see key pressed not cautch @ all. however, after click background of page press keyboard. can see key caught then.

this doesn't happen in chrome, in firefox.

is familiar chance.

thanks


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