javascript - CSS transition of a div does not animate -

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when click div, want second div expand/collapse. done using js, html, , css. want css transition animate.

right jumping expansion , either scroll (edge) or jump after wait (chrome, opera, firefox).

i've tried set height 1px instead of 0px, doesn't change anything.

function growdiv(id) {    var ele = document.getelementbyid(id);    if (ele.style.height == '100%') {      ele.style.height = '0px';    } else {      ele.style.height = '100%';    }  }
.main {    font-weight: 700;    overflow: hidden;    cursor: pointer;  }  .secondary {    -webkit-transition: height .5s ease;    -moz-transition: height .5s ease;    -ms-transition: height .5s ease;    -o-transition: height .5s ease;    transition: height .5s ease;    overflow: hidden;    padding-left: 20px;    height: 0px;    cursor: pointer;  }
<div class="main" onclick="growdiv('expandable')">    expand  </div>  <div class="secondary" id="expandable" onclick="growdiv('expandable')">    number1,    <br>number2,    <br>number3,    <br>number4.  </div>

codepen behaves know full site does, measure; here's codepen: http://codepen.io/anon/pen/ezjqjm

are willing use jquery? offers cool animation possibilities, , may accomplish trying do. possible alternative approach.

check out fiddle here:

https://jsfiddle.net/3mo28z1t/11/

<div class="main" id="clicker">   expand </div> <div class="secondary" id="expandable">   number1, <br> number2, <br> number3, <br> number4. </div>  <script>  $( document ).ready(function() {  $(".secondary").hide();  $(document).ready(     function(){         $("#clicker").click(function () {             $(".secondary").toggle("slow");         });      });     }); </script>

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