页面加载时的 CSS 边框过渡？

Question

我想在我的页面加载后制作一个定时边框绘制动画。我基本上希望隐藏 div 容器的边框，然后通过转换来绘制容器边框，由正在加载的页面触发（不悬停）。我能够在悬停时找到如何执行此操作，但我无法弄清楚如何在页面加载时执行此操作。我将如何在下面的代码中实现它？

<div id="profile-content">
     Insert Content Here
 </div>

 #profile-content
 {
     border: 3px solid;
     border-color: #FFFFFF;
     padding: 4em 4em 4em 14em;
     margin: 0 0 0 4em;
 }

Answer 1

查看边框过渡的方法有很多，我只展示了一对。

Source

有一个属性transition，它接受seconds作为参数来给你效果。

#profile-content {
  outline: solid 5px #FC5185;
  transition: outline 0.6s linear;
  margin: 0.5em;
}

#profile-content:hover {
  outline-width: 10px;
}

<div id="profile-content">
  Insert Content Here
</div>

或

Div边框过渡：

div {
  background: none;
  border: 0;
  box-sizing: border-box;
  margin: 1em;
  padding: 1em 2em;
  box-shadow: inset 0 0 0 2px #f45e61;
  color: #f45e61;
  font-size: inherit;
  font-weight: 700;
  position: relative;
  vertical-align: middle;
  width: auto;
}

div::before,
div::after {
  box-sizing: inherit;
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
}

#profile-content {
  -webkit-transition: color 0.25s;
  transition: color 0.25s;
}

#profile-content::before,
#profile-content::after {
  border: 2px solid transparent;
  width: 0;
  height: 0;
}

#profile-content::before {
  top: 0;
  left: 0;
}

#profile-content::after {
  bottom: 0;
  right: 0;
}

#profile-content:hover {
  color: Teal;
}

#profile-content:hover::before,
#profile-content:hover::after {
  width: 100%;
  height: 100%;
}

#profile-content:hover::before {
  border-top-color: black;
  border-right-color: black;
  -webkit-transition: width 1s ease-out, height 0.25s ease-out 0.25s;
  transition: width 0.25s ease-out, height 0.25s ease-out 0.25s;
}

#profile-content:hover::after {
  border-bottom-color: black;
  border-left-color: black;
  -webkit-transition: border-color 0s ease-out 0.5s, width 0.25s ease-out 0.5s, height 0.25s ease-out 0.75s;
  transition: border-color 0s ease-out 0.5s, width 0.25s ease-out 0.5s, height 0.25s ease-out 0.75s;
}

<div id="profile-content">
  Insert Content Here
</div>