@mixin border-image($borders...) {
    $webkit-borders: ();
    $spec-borders: ();

    @each $border in $borders {
        $webkit-border: ();
        $spec-border: ();
        $border-type: type-of($border);

        @if $border-type == string or list {
            $border-str: if($border-type == list, nth($border, 1), $border);

            $url-str: str-slice($border-str, 1, 3);
            $gradient-type: str-slice($border-str, 1, 6);

            @if $url-str == "url" {
                $webkit-border: $border;
                $spec-border: $border;
            } @else if $gradient-type == "linear" {
                $gradients: _linear-gradient-parser("#{$border}");
                $webkit-border: map-get($gradients, webkit-image);
                $spec-border: map-get($gradients, spec-image);
            } @else if $gradient-type == "radial" {
                $gradients: _radial-gradient-parser("#{$border}");
                $webkit-border: map-get($gradients, webkit-image);
                $spec-border: map-get($gradients, spec-image);
            } @else {
                $webkit-border: $border;
                $spec-border: $border;
            }
        } @else {
            $webkit-border: $border;
            $spec-border: $border;
        }

        $webkit-borders: append($webkit-borders, $webkit-border, comma);
        $spec-borders: append($spec-borders, $spec-border, comma);
    }

    -webkit-border-image: $webkit-borders;
    border-image: $spec-borders;
    border-style: solid;
}

//Examples:
// @include border-image(url("image.png"));
// @include border-image(url("image.png") 20 stretch);
// @include border-image(linear-gradient(45deg, orange, yellow));
// @include border-image(linear-gradient(45deg, orange, yellow) stretch);
// @include border-image(linear-gradient(45deg, orange, yellow) 20 30 40 50 stretch round);
// @include border-image(radial-gradient(top, cover, orange, yellow, orange));