jquery - CSS real "slide" toggle not "height" toggle -

i have been looking around while did not find solution trying create.

i have real "slide" toggle, div "moving down in". if take jquery slidetoggle or several css solutions found, modify height of div, don't slide it.

so created own solution animating margin-top property, works nicely, have problem dynamic heights (for example if resize browser-window), not sure how high negative margin-top should make sure slided out, , on other side not delay slide-in because margin-top far out.

i use

margin-top: -100%; 

however, if resize window/frame, it's not enough negative margin.

maybe there better solution out there did not find it, created fiddle, share idea , hear suggestions.

update: latest updated fiddle here ... changed few things, feedback!

update - fix typo , tidy up.

i think can use in combination jquery show() , hide() code avoid issue.

http://jsfiddle.net/jzj80kzs/7/

$('.switch').click(function(event) {   var theswitch = $(this).closest('.block').find('.switch');   var theblock = $(this).closest('.block').find('.details');   if (theblock.hasclass('mt0')) {     theswitch.html('+ show');  // change switch dynamically     theblock.removeclass('mt0').slideup(function() {       $(this).delay(300).hide();     });   } else {     theswitch.html('- hide');     theblock.addclass('mt0').slidedown().show();   } }); 

$('.switch').click(function(event) {    var theswitch = $(this).closest('.block').find('.switch');    var theblock = $(this).closest('.block').find('.details');    if (theblock.hasclass('mt0')) {      theswitch.html('+ show'); // change switch dynamically      theblock.removeclass('mt0').slideup(function() {        $(this).delay(300).hide();      });    } else {      theswitch.html('- hide');      theblock.addclass('mt0').slidedown().show();    }  });

div.block {    position: relative;    overflow: hidden;    border: 1px solid #333;    border-bottom: 0px;    line-height: 20px;    background-color: #fff;  }  div.block:last-child {    border-bottom: 1px solid #333;  }  div.basics {    position: relative;    background-color: #fff;    z-index: 2;    padding: 2px 4px;  }  div.details {    border-top: 1px solid #333;    position: relative;    background-color: #99f;    z-index: 1;    height: auto;    margin-top: -100%;    -webkit-transition: margin-top 600ms cubic-bezier(0.17, 0.04, 0.03, 0.94);    -moz-transition: margin-top 600ms cubic-bezier(0.17, 0.04, 0.03, 0.94);    -o-transition: margin-top 600ms cubic-bezier(0.17, 0.04, 0.03, 0.94);    transition: margin-top 600ms cubic-bezier(0.17, 0.04, 0.03, 0.94);  }  div.mt0 {    margin-top: 0px;  }  span.switch {    float: right;    cursor: pointer;    font-size: 20px;    font-weight: bold;  }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>  <div class="block">    <div class="basics">      lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.      <span class="switch">+ show</span>    </div>    <div class="details">      @ vero eos et accusam et justo duo dolores et ea rebum. stet clita kasd gubergren, no sea takimata sanctus est lorem ipsum dolor sit amet.      <br />lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. @ vero eos et accusam et justo duo dolores et ea rebum. stet clita kasd gubergren, no sea      takimata sanctus est lorem ipsum dolor sit amet.    </div>  </div>    <div class="block">    <div class="basics">      lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.      <span class="switch">+ show</span>    </div>    <div class="details">      @ vero eos et accusam et justo duo dolores et ea rebum. stet clita kasd gubergren, no sea takimata sanctus est lorem ipsum dolor sit amet.      <br />lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. @ vero eos et accusam et justo duo dolores et ea rebum. stet clita kasd gubergren, no sea      takimata sanctus est lorem ipsum dolor sit amet.    </div>  </div>    <div class="block">    <div class="basics">      lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.      <span class="switch">+ show</span>    </div>    <div class="details">      @ vero eos et accusam et justo duo dolores et ea rebum. stet clita kasd gubergren, no sea takimata sanctus est lorem ipsum dolor sit amet.      <br />lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. @ vero eos et accusam et justo duo dolores et ea rebum. stet clita kasd gubergren, no sea      takimata sanctus est lorem ipsum dolor sit amet.    </div>  </div>    <div class="block">    <div class="basics">      lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.      <span class="switch">+ show</span>    </div>    <div class="details">      @ vero eos et accusam et justo duo dolores et ea rebum. stet clita kasd gubergren, no sea takimata sanctus est lorem ipsum dolor sit amet.      <br />lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. @ vero eos et accusam et justo duo dolores et ea rebum. stet clita kasd gubergren, no sea      takimata sanctus est lorem ipsum dolor sit amet.    </div>  </div>