css3 实现打字效果 小工具

<style>
    * {
        margin: 0;
        padding: 0;
    }
    @keyframes cursors {
        0% {
            border-left-color: rgba(0, 0, 0, 0);
        }
        50% {
            border-left-color: rgba(0, 0, 0, 1);
        }
        0% {
            border-left-color: rgba(0, 0, 0, 0);
        }
    }
    @keyframes cover {
        from {
            left: 0;
        }
        to {
            left: 100%;
        }
    }
    .wrapper {
        height: 100px;
        /* 该字体是等距，所以不用自己设置等距的字体 */
        font-family: monospace;
        font-size: 40px;
        line-height: 100px;
        display: inline-block;
        position: relative;
    }
    .wrapper::after {
        content: "";
        position: absolute;
        width: 100%;
        height: 90px;
        top: 10px;
        background-color: #fff;
        border-left: 2px solid #000;
        box-sizing: border-box;
        animation: cursors 1s steps(1, end) forwards infinite,
            /* 关键在与这个动画，每一步实现的是一个字 */
            cover 12s steps(12, end);
    }
</style>

<div class="wrapper">关键在与这个动画，每一步</div>