CSS3伪元素实现自动打字动画原理及代码

原理:Typing Animation with Pseudo-Elements 看起来是打字，其实是使用伪元素覆盖在字符串上，然后逐渐减少伪元素覆盖宽度来实现的视觉效果。

<div>
    <h1>Typing Animation</h1>
    <p class="tagline">
        <span class="tagline-skill"><span class="tagline-skill_inner">webdesign</span></span>
    </p>
</div>
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.tagline-skill_inner:after {
    content: "";
    position: absolute;
    top: -1px;
    right: 0;
    bottom: -2px;
    left: 0;
    border-left: 1px solid #fff;
    background-color: #2a2a28;
    -webkit-animation: animatetoright 1s steps(10) infinite alternate;
    animation: animatetoright 1s steps(10) infinite alternate;
}
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效果：