@mixin u-keyframes($name) {
    @each $prefix in $saf-prefixes {
        @if $prefix == "webkit" {
            @-webkit-keyframes #{$name} {
                @include u-prefix-only($prefix);
                @content;
            }
        } @else if $prefix == "moz" {
            @-moz-keyframes #{$name} {
                @include u-prefix-only($prefix);
                @content;
            }
        } @else if $prefix == "o" {
            @-o-keyframes #{$name} {
                @include u-prefix-only($prefix);
                @content;
            }
        } @else if $prefix == "spec" {
            @keyframes #{$name} {
                @include u-prefix-all();
                @content;
            }
        }
    }
}