<count-down title="点击重试"></count-down>

@property --t { 
    syntax: '<integer>';
    inherits: false;
    initial-value: 0;
}
@counter-style stop {
    system: cyclic;
    symbols: "Go~";
    range: infinite 0;
}
html,body{
    margin: 0;
    height: 100%;
    display: grid;
    place-content: center;
}
count-down{
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: Consolas, Monaco, monospace;
    font-size: 120px;
}
count-down::after{
    --t: 5;
    --dur: 1;
    counter-reset: time var(--t);
    content: counter(time, stop);
    animation: count calc( var(--t) * var(--dur) * 1s ) steps(var(--t)) forwards,
    shark calc(var(--dur) * 1s) calc(var(--dur) * .8s) calc(var(--t));
}
count-down:active::after{
    animation: none;
    content: '重新开始';
}
@keyframes count {
    to {
        --t: 0;
    }
}
@keyframes shark {
    0%{
        opacity: 1;
        transform: scale(1);
    }
    
    20%{
        opacity: 0;
        transform: scale(0.4);
    }
}