== should format at rule keyframes ==

@keyframes foo {}

@keyframes slidein {
    from {
        transform: translateX(0%);
    }

    to {
        transform: translateX(100%);
    }
}

@keyframes identifier {
    0% { top: 0; left: 0; }
    30% { top: 50px; }
    68%, 72% { left: 50px; }
    100% { top: 100px; left: 100%; }
}

@keyframes FOO {}
@keyframes "initial" {}
@keyframes "None" {}
@keyframes slide-right {

    from {
        margin-left: 0px;
    }

    50% {
        margin-left: 110px;
        opacity: 1;
    }

    50% {
        opacity: 0.9;
    }

    to {
        margin-left: 200px;
    }

}

@keyframes slidein-up {
    fRoM {
        transform: translateX(0%);
    }

    tO {
        transform: translateX(100%);
    }
}

@keyframes \61 bc { from {} }
@keyframes a\62 c { from {} }
@keyframes abc { \66rom {} }
@keyframes a\2c c { \66rom {} }
@keyframes a\,c { \66rom {} }

[expect]
@keyframes foo {}

@keyframes slidein {
    from {
        transform: translateX(0%);
    }

    to {
        transform: translateX(100%);
    }
}

@keyframes identifier {
    0% {
        top: 0;
        left: 0;
    }

    30% {
        top: 50px;
    }

    68%, 72% {
        left: 50px;
    }

    100% {
        top: 100px;
        left: 100%;
    }
}

@keyframes FOO {}

@keyframes "initial" {}

@keyframes "None" {}

@keyframes slide-right {
    from {
        margin-left: 0px;
    }

    50% {
        margin-left: 110px;
        opacity: 1;
    }

    50% {
        opacity: 0.9;
    }

    to {
        margin-left: 200px;
    }
}

@keyframes slidein-up {
    fRoM {
        transform: translateX(0%);
    }

    tO {
        transform: translateX(100%);
    }
}

@keyframes \61 bc {
    from {}
}

@keyframes a\62 c {
    from {}
}

@keyframes abc {
    \66rom {}
}

@keyframes a\2c c {
    \66rom {}
}

@keyframes a\,c {
    \66rom {}
}