html - 仅在动画后使用 css 隐藏/删除 div 从 html 占用的空间

Question

我正在尝试“物理”删除，或者让 div(例如)在隐藏后不占用屏幕空间。

我在#test div下面又加了一个div，说明#test被隐藏后，还是会占用屏幕空间。有没有办法让那个空间消失，只用 css？

#test {
  opacity: 0;
  -webkit-animation: fadeinout 3s;
  /* Safari, Chrome and Opera > 12.1 */
  -moz-animation: fadeinout 3s;
  /* Firefox < 16 */
  -ms-animation: fadeinout 3s;
  /* Internet Explorer */
  -o-animation: fadeinout 3s;
  /* Opera < 12.1 */
  animation: fadeinout 3s;
}

@keyframes fadeinout {
  from {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

@-moz-keyframes fadeinout {
  /* Firefox */
  from {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

@-webkit-keyframes fadeinout {
  /* Safari and Chrome */
  from {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

@-o-keyframes fadeinout {
  /* Opera */
  from {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

<div id="test">hide me after 3 seconds</div>
<div>After 3 seconds I don't move up.</div>

Answer 1

您还可以设置最大高度的动画 - 只需确保中间的最大高度高于最高的淡化 div

#test {
  opacity: 0;
  -webkit-animation: fadeinout 3s;
  /* Safari, Chrome and Opera > 12.1 */
  -moz-animation: fadeinout 3s;
  /* Firefox < 16 */
  -ms-animation: fadeinout 3s;
  /* Internet Explorer */
  -o-animation: fadeinout 3s;
  /* Opera < 12.1 */
  animation: fadeinout 3s;
    max-height: 0;
}

@keyframes fadeinout {
  from {
    max-height: 0;
    opacity: 0;
  }
  50% {
    opacity: 1;
    max-height: 5em;
  }
  to {
    opacity: 0;
    max-height: 0;
  }
}

<div id="test">hide me after 3 seconds</div>
<div>After 3 seconds I don't move up.</div>