swc/crates/swc_css_parser/tests/fixture/rome/keyframe/input.css

@keyframes important1 {
    from {
        margin-top: 50px !important;
    }
    to {
        margin-top: 100px !important;
    }
}

@keyframes foo {
    from {
    }
    to {
    }
    15% {
    }
    0% {
    }
    100% {
    }
}

@keyframes FOO {
}