dom - Smooth Resize Animation with Pure JavaScript -

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i'm trying work in [smooth] resize animation effect web application. problem css3's animation , transition effects stutter i've decided go javascript approach. don't want use jquery ui or form of jquery because loading time, though miniscule when served through cdn, 1 http request. suggestion on approach?

pure javascript change height of div try this,,

var myvar = null;  function cal(){    var aa = document.getelementbyid("aa");    var h = aa.style.height;    h=parseint(h.replace("px",""));    myvar = setinterval(function(){        if(h > 100){          mystopfunction();        }else{          h+=5;          aa.style.height = h+"px";        }            },30);    }    function mystopfunction() {      clearinterval(myvar);  }
<div id="aa" style="background-color:rgba(0, 119, 221, 0.47);height:30px;">    try  </div>  <button onclick="cal()">click here</button>


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