How to flip background image using CSS?

You can flip it horizontally with CSS…

a:visited {
    -moz-transform: scaleX(-1);
    -o-transform: scaleX(-1);
    -webkit-transform: scaleX(-1);
    transform: scaleX(-1);
    filter: FlipH;
    -ms-filter: "FlipH";
}

jsFiddle.

If you want to flip vertically instead…

a:visited {
    -moz-transform: scaleY(-1);
    -o-transform: scaleY(-1);
    -webkit-transform: scaleY(-1);
    transform: scaleY(-1);
    filter: FlipV;
    -ms-filter: "FlipV";
}

Source.