javascript - backgroundSize "cover" not working on Firefox -


this question has answer here:

i using following load ramdom background image each time browser refreshed. on top use 2 z-layers fade in, 1 black trasparent , overlay pattern transparent solid. works fine on chrome , safari firefox refuses fade out layer no1 (black transpartent), , firefox refuses strech images cover background.

<script type="text/javascript">  var totalcount = 6; function changeit()  { var num = math.ceil( math.random() * totalcount ); document.body.background = 'images/'+num+'.jpg'; document.body.style.backgroundsize = "cover"; document.body.style.backgroundposition = "center"; } </script>  </head> <body style="background-color:#000">  <a style="display:block; position:fixed; left:0; top:0; width:100%; height:100%; cursor:pointer" href="#/"> <div class="overlay fade-out one"> </div> <div class="overlaygrid"> </div> </a> </body> <script type="text/javascript">  changeit(); </script>  </html>

and css

.fade-out { opacity:1;  -webkit-animation:fadein ease-in 0; -moz-animation:fadein ease-in 0; animation:fadein ease-in 0;  -webkit-animation-fill-mode:forwards;  -moz-animation-fill-mode:forwards; animation-fill-mode:forwards;  }  .fade-out.one { -webkit-animation-delay: 0.0s; -moz-animation-delay: 0.0s; animation-delay: 0.0s; }    .overlay {display:block;position:fixed;left:0;top:0;width:100%;height:100%; background:#000; z-index:1 }  .overlaygrid {display:block;position:fixed;left:0;top:0;width:100%;height:100%; background: url('../assets/bg-overlay-pattern.png'); z-index:2}

you'll need make sure add following css:

html {     height: 100%; } body {     background-size: cover;     background-repeat: no-repeat;     height: 100%; }

note: if body doesn't have background already, can set background-size via css without having reset via javascript. keeps js manipulation minimum. same goes styling property (except of course image...unless want have default image).


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