加载时淡入淡出过渡到 div [重复]

Question

您能否在加载时仅使用 CSS 对 div 应用淡入淡出过渡？我有一个 div，它最初应该是透明的，几秒钟后应该变成黄色。我知道可以在状态更改（例如悬停）时执行此操作。有人可以帮忙吗？

干杯

#content {
    background-color: #FF0;
    height: 100px; width: 100px;
    -webkit-transition: background-color 10000ms linear;
    -moz-transition: background-color 10000ms linear;
    -o-transition: background-color 10000ms linear;
    -ms-transition: background-color 10000ms linear;
    transition: background-color 10000ms linear;
}

<div id="content"></div>

Answer 1

@keyframes fadeInAnimation{
0%{
    opacity: 0;
}
100%{
    opacity: 1;
}

}

#content {
animation-name: fadeInAnimation;
animation-duration: 500ms;
animation-fill-mode: forwards;
background-color: #FF0;
height: 100px; width: 100px;
-webkit-transition: background-color 10000ms linear;
-moz-transition: background-color 10000ms linear;
-o-transition: background-color 10000ms linear;
-ms-transition: background-color 10000ms linear;
transition: background-color 10000ms linear;

}