html - Background size shrinks from 'cover' to 50% when using a keyframe animation on 'transform: scale' in Firefox -

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i'm trying animate 'transform: scale' property of ::before pseudo element scale(1) scale(1.1), meant animated background of div covers whole viewport. background-size set 'cover' , displays correctly on page load, when animation kicks in after short delay, background shrinks 50% of viewport. works expected in safari, chrome , opera (on mac), on firefox (mac) behaviour described above. on top of that, when resizing browser window down smaller size, displays fine again, see issue in firefox, browser window needs @ least wider 1000px.

example below (jsfiddle: http://jsfiddle.net/yuy4u/embedded/result/).

html:

<!doctype html> <html>   <head>     <title>animation test case</title>     <link href="style.css" rel="stylesheet">   </head>   <body>     <div>this div</div>   </body> </html>

css:

html {   height: 100%;   width: 100%; } body {   height: 100%;   margin: 0;   padding: 0;   width: 100%;   overflow: hidden; } div {   width: 100%;   height: 100%; } div::after {   background: url("http://fineartamerica.com/images-simple-print/images-medium/33-landscape-odon-czintos.jpg") top center no-repeat;   background-size: cover;   content: "";   display: block;   position: absolute;   top: 0; left: 0;   width: 100%;   height: 100%;   z-index: -2;   -moz-animation: bg-anim 10s linear 2s infinite;   -webkit-animation: bg-anim 10s linear 2s infinite;   -moz-transform: scale(1);   -webkit-transform: scale(1);   transform: scale(1); } @-moz-keyframes bg-anim {   0% {     -moz-transform: scale(1);     transform: scale(1);   }   50% {     -moz-transform: scale(1.1);     transform: scale(1.1);   } } @-webkit-keyframes bg-anim {   0% {     -webkit-transform: scale(1);     transform: scale(1);   }   50% {     -webkit-transform: scale(1.1);     transform: scale(1.1);   } } @keyframes bg-anim {   0% {     -moz-transform: scale(1);     -webkit-transform: scale(1);     transform: scale(1);   }   50% {     -moz-transform: scale(1.1);     -webkit-transform: scale(1.1);     transform: scale(1.1);   } }

i've tried changing background-size property percentage value, didn't fix problem , not solution project. i've tried changing scale values 1 , 0.9, works fine, background doesn't cover whole viewport not acceptable situation either.

any ideas on how work around issue? have missed obvious or browser bug or browser-specific implementation discrepancy even?


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