HTML+CSS实现打字机效果

看到了一些Hexo博客首页用到了打字机效果。于是思考不使用Javascript，如何实现打字机效果呢？

一个字总结：丑。

实现：利用css中animiation实现关键帧组成循环动画。width减少模仿字体被删除；border-right黑白变色模仿光标闪烁

直接上源码：

<!DOCTYPE html>
<html lang="en">
 
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    #demo {
      white-space: nowrap;
      font-family: 'Courier New', Courier, monospace;
      width: 250px;
      font-size: 2em;
      font-weight: 700;
      overflow: hidden;
      animation: first 6s step-end infinite;
      display: inline-block
    }
    #key {
      margin-top: -200px;
      line-height: 50px;
      font-size: 1em;
      color: blue;
    }
    @keyframes first {
      0% {
        width: 250px;
        border-right: 3px solid black;
      }
 
      5% {
        width: 250px;
        border-right: 3px solid white;
      }
 
      10% {
        width: 250px;
        border-right: 3px solid black;
      }
 
      20% {
        width: 200px;
        border-right: 3px solid white;
      }
 
      25% {
        width: 200px;
        border-right: 3px solid black;
      }
 
      30% {
        width: 200px;
        border-right: 3px solid white;
      }
 
      40% {
        width: 150px;
        border-right: 3px solid black;
      }
 
      45% {
        width: 150px;
        border-right: 3px solid white;
      }
 
      50% {
        width: 150px;
        border-right: 3px solid black;
      }
 
      60% {
        width: 100px;
        border-right: 3px solid white;
      }
 
      80% {
        width: 50px;
        border-right: 3px solid black;
      }
 
      100% {
        width: 0px;
        border-right: 3px solid white;
      }
    }
  </style>
</head>
 
<body>
  <span id="demo">THIS DEMO</span>
</body>
 
</html>