javascript - CSS3 transitions seem to need a "warmup" time before they kick off? Do I have to add a wait? -

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i have css3 transition shrink height of element. i'm doing by:

  1. css3 transition , destination height specified on class (e.g. height:5px in class)
  2. assign height=$el.height() element in style attribute (e.g. height:100px on style)
  3. add class element
  4. remove height defined in style attribute
  5. computed css value changes style's 100px class's 5px, triggers transition

what i'm discovering there seems delay on setting css3 transition trigger, , if step #4 done after #3, trigger see height auto instead of 100px, , no transition happens (due limitation of css3, can't transition height:auto height:x).

here's actual code:

$(document).ready(function() {   $a = $('#box'); // height:auto, not specified   $a.css('height',$a.height()); // height:100px on style;   $a.addclass('shrink'); // height:100px on style, height:5px on class   $a.css('height',''); // height removed style, falls 5px on class });

here's jsfiddle demonstrating issue: http://jsfiddle.net/1escylqf/2/

in fiddle, if add delay of 20ms before removing height value, transition works. if comment line out , call css('height','') after adding class, it's fast , no transition happens.

is bug in browser implementation of css3 transitions? or need add in timeout?

create css3 animation appended in jquery dynamic starting height.

the jquery

  1. get boxes height:

    var boxheight = $('#box').height();

  2. create animation , apply shrink class. starting height variable.

    var animation = ' <style type="text/css">     .shrink {         -webkit-animation: shrink 12s forwards;         animation: shrink 12s forwards;       }        @-webkit-keyframes shrink {           0% {              height:' + boxheight + 'px;              }           100% {              height: 5px;           }       }       @keyframes shrink {           0% {              height:' + boxheight + 'px;              }           100% {              height: 5px;           }       } </style>';

  3. append style <head>

    $('head').append(animation);

complete example

$(document).ready(function() {    var boxheight = $('#box').height();        var animation = '<style type="text/css"> .shrink { -webkit-animation: shrink 12s forwards; animation: shrink 12s forwards; } @-webkit-keyframes shrink { 0% { height:' + boxheight + 'px; } 100% { height: 5px; } } @keyframes shrink { 0% { height:' + boxheight + 'px; } 100% { height: 5px; } }</style>';        $('head').append(animation);  });
#box,  #box2 {    background: red;    margin: 10px;  }  .shrink {    overflow: hidden;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>  <div id="box" class="shrink">    <p>make height</p>    <p>make height</p>    <p>make height</p>    <p>make height</p>  </div>


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