css - Change Webkit properties through Javascript? -


please me, might cause i'm new css animations , javascript using code suppose change properties of , when run code else in code except change properties in css of desired div. i've tried 4 of these , none of them seem work, out of date? there new way of doing or what? none of them work @ all.

document.getelementbyid('playbar').style.webkitanimationduration = 20 + "s"; document.getelementbyid('playbar').style.animationduration = 20 + "s"; document.getelementbyid('playbar').style['-webkit-transition-duration'] = '50s';  value = math.floor((100 / duration) * currenttime); document.getelementbyid('playbar').setattribute("style","-webkit-filter:grayscale(" + value + "%)")

css code

#playbar { width: 1px; height: 12px; background: white; float:left; -webkit-animation: mymove infinite; /* chrome, safari, opera */ -webkit-animation-duration: 10s; /* chrome, safari, opera */ animation: mymove infinite; animation-duration: 0s; }  /* chrome, safari, opera */ -webkit-keyframes mymove { {width: 0%;} {width: 100%;} }  @keyframes mymove { {width: 0%;} {width: 100%;} }

instead of 

this.style['-webkit-transition-duration'] = '50s'

use 

this.style.webkittransitionduration="50s"

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