jquery - Parallax background doesn't work in firefox and safari -


i have problem parallax background in firefox , safari. when test in chrome, opera , ie works.

in firefox/safari see empty spacing on top , bottom.

in these browsers, background moves @ different speed.

this code:

<section class="main"> <div class="top-slider-wrapper w-100 fl relative">     <div class="top-slider w-100 fl">         <?php foreach ($tbanery $tb): ?>             <div class="slide-item w-100">                 <div class="parallax w-100 tc tl-md pv6 pv7-sm fl" style="background-image: url('img/<?php echo $tb->zdjecie; ?>');">                     <div class="container cf">                         <h2 class="fc-light fw4 ttu pl2-md mt0 mb2"><?php print $tb->nazwa; ?></h2>                         <p class="fc-light ttu pl2-md"><?php print $tb->opis; ?></p>                         <div class="buttons">                             <a href="#" class="btn btn-grey ma2">kontakt</a>                             <a href="#" class="btn btn-red ma2">zamów</a>                         </div>                     </div>                 </div>             </div>         <?php endforeach; ?>     </div> </div> 

var paralaxbg = function() { $('.parallax').each(function() {     $(this).css('background-attachment', 'fixed');      if ($(this).isonscreen()) {          var difference = $(window).scrolltop() - $(this).offset().top;         var half = (difference / 3) + 'px';          $(this).css('background-position', '0% calc(50% - ' + half + ')');      } }); };   .parallax {   background-position: center;   background-repeat: no-repeat;   background-size: cover; }


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