css - Transitions won't work when transform:translate3d combined with opacity -


on website have second header drifts down top when user scrolls down page. original header remains absolutely positioned @ top , scrolled out of sight second slides down.

due google chrome bounce scroll effect, if user scrolls when browser @ top of page, they're able see second header hanging around outside document. looks strange, , happens in chrome.

i've been trying make second header invisible when user scrolls top , slides out of view. have been attempting opacity value of 0 set ease value. problem is, using transform:translate3d animate slide-up / slide-down effect, , can't both opacity , transform work in same transition rule.

ideally i'd following work, won't reason.

.hidden-header {   position:fixed;   transform:translate3d(0,-100%,0);   background-color:red;   width:100%;   height:55px;   opacity:0;   transition: translate 0.3s, opacity 0s ease .3s; }  body.header-dropdown .hidden-header {   transform:translate3d(0,0,0);   opacity:1;   transition: translate .5s, opacity 0s; }

here jsfiddle show mean – https://jsfiddle.net/wbmm0kl7/2/

at moment have had set transition: .3s means opacity fades in , out well, want avoid.

here picture of website problem on chrome trying solve. notice second header , nav menu visible when scrolling against edge of viewport/document.

enter image description here

here rest of code:

html 

  <header class="header">regular header</header>   <div class="transform-container">       <div class="hidden-header">hidden header (slides down on scroll)</div>   </div>    <div class="content"></div>  </div>

css html, body { height:100%; width:100%; margin:0; padding:0; }

.wrapper {   background-color:orange;   min-height:100%; }  .header {   position:absolute;   width:100%;   height:55px;   background-color:pink; }  .hidden-header {   position:fixed;   transform:translate3d(0,-100%,0);   background-color:red;   width:100%;   height:55px;   opacity:0;   transition: .3s; }  body.header-dropdown .hidden-header {   transform:translate3d(0,0,0);   opacity:1;   transition: .5s; }  .content {   height:2000px; }

jquery jquery(document).ready(function($) {

   $(window).scroll(function() {          if ($(this).scrolltop() > 200) {              $('body').addclass('header-dropdown');          } else {              $('body').removeclass('header-dropdown');          }             });       });

as per comment, have typo in css transitions rule. you cannot transition individual transform components. instead, use transition: transform 0.5s; example.

to achieve effect of hidden header appearing immediately, set transition duration of opacity 0s when .header-dropdown added. achieve effect of hidden header hiding after transform done transitioning, set transition delay of opacity transition duration used:

.hidden-header {   position:fixed;   transform:translate3d(0,-100%,0);   background-color:red;   width:100%;   height:55px;   /* delay opacity transition when returning ground state */   transition: transform 0.5s, opacity 0s 0.5s;   opacity: 0; }  body.header-dropdown .hidden-header {   transform:translate3d(0,0,0);   opacity: 1;   transition: transform 0.5s 0s, opacity 0s; }

see fixed fiddle here: https://jsfiddle.net/teddyrised/wbmm0kl7/3/

note first numeric value of transition shorthand transition-duration, while second numeric value transition-delay


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