我在CSS中制作了倒计时动画，但在Microsoft Edge中不起作用。你们知道这里的问题吗？
#spin:after {
content: "";
animation: countdown 25s linear 1;
animation-fill-mode: forwards;
}
@keyframes countdown {
0% {
content: "25";
}
4% {
content: "24";
}
8% {
content: "23";
}
12% {
content: "22";
}
16% {
content: "21";
}
20% {
content: "20";
}
24% {
content: "19";
}
28% {
content: "18";
}
32% {
content: "17";
}
36% {
content: "16";
}
40% {
content: "15";
}
44% {
content: "14";
}
48% {
content: "13";
}
52% {
content: "12";
}
56% {
content: "11";
}
60% {
content: "10";
}
64% {
content: "9";
}
68% {
content: "8";
}
72% {
content: "7";
}
76% {
content: "6";
}
80% {
content: "5";
}
84% {
content: "4";
}
88% {
content: "3";
}
92% {
content: "2";
}
96% {
content: "1";
}
100% {
content: "0";
}
}<div id="countdown">
<p class="text-bold">Dolorum rem eaque ducimus omnis:<br/>
<span id="spin"></span></p>
</div>
它在Firefox和Chrome中完美运行。