http://apolytos.com/new/img/test.html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<style>
body {
background:url("background.jpg");
background-repeat:no-repeat;
background-attachment:fixed;
background-size: cover;
background-position:top center;
margin:0;
}
</style>
</head>
<body>
</body>
</html>
Internet Explorer 11 is NOT covering; view the link provided. If I remove the :fixed, it covers as it's supposed to, however the bg scrolls with content on page which is not desired. There appears to be a conflict with these 2 lines of code in IE.
try this code, it should work well.
html {
background: url(images/bg.jpg) no-repeat center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}