CSS故障效果(glitch)

来源：https://wow.techbrood.com/fiddle/3829
从这里扒下来一些必要的内容，保留文字部分的glitch，即：

HTML：

<div class="wrapper">
    <div class="glitch" data-text="404 NOT FOUND ...">404 NOT FOUND ...div>
div>

CSS：

.wrapper {
    position: relative;
    height: 100%;
    width: 100%;
    min-height: 300px;
    padding: 5% 5% 5%;
}
.glitch {
    color: white;
    font-size: 7em;
    font-weight: bold;
    position: relative;
    width: auto;
    margin: 0 auto;
    max-width: 80%;
    background: rgba(0, 0, 0, 0.95);
    letter-spacing: 1px;
    z-index: 3;
}
@keyframes noise-anim {
    0% {
        clip: rect(77px, 9999px, 51px, 0);
    }
    5% {
        clip: rect(25px, 9999px, 30px, 0);
    }
    10% {
        clip: rect(70px, 9999px, 75px, 0);
    }
    15% {
        clip: rect(94px, 9999px, 96px, 0);
    }
    20% {
        clip: rect(24px, 9999px, 11px, 0);
    }
    25% {
        clip: rect(12px, 9999px, 53px, 0);
    }
    30% {
        clip: rect(79px, 9999px, 54px, 0);
    }
    35% {
        clip: rect(70px, 9999px, 93px, 0);
    }
    40% {
        clip: rect(73px, 9999px, 86px, 0);
    }
    45% {
        clip: rect(100px, 9999px, 96px, 0);
    }
    50% {
        clip: rect(5px, 9999px, 68px, 0);
    }
    55% {
        clip: rect(6px, 9999px, 16px, 0);
    }
    60% {
        clip: rect(4px, 9999px, 60px, 0);
    }
    65% {
        clip: rect(86px, 9999px, 74px, 0);
    }
    70% {
        clip: rect(6px, 9999px, 53px, 0);
    }
    75% {
        clip: rect(41px, 9999px, 35px, 0);
    }
    80% {
        clip: rect(70px, 9999px, 60px, 0);
    }
    85% {
        clip: rect(52px, 9999px, 66px, 0);
    }
    90% {
        clip: rect(18px, 9999px, 16px, 0);
    }
    95% {
        clip: rect(71px, 9999px, 80px, 0);
    }
    100% {
        clip: rect(69px, 9999px, 51px, 0);
    }
}
.glitch:after {
    content: attr(data-text);
    position: absolute;
    left: 2px;
    text-shadow: -1px 0 red;
    top: 0;
    color: white;
    background: black;
    overflow: hidden;
    clip: rect(0, 900px, 0, 0);
    animation: noise-anim 2s infinite linear alternate-reverse;
}
@keyframes noise-anim-2 {
    0% {
        clip: rect(20px, 9999px, 7px, 0);
    }
    5% {
        clip: rect(51px, 9999px, 73px, 0);
    }
    10% {
        clip: rect(33px, 9999px, 21px, 0);
    }
    15% {
        clip: rect(60px, 9999px, 48px, 0);
    }
    20% {
        clip: rect(86px, 9999px, 48px, 0);
    }
    25% {
        clip: rect(32px, 9999px, 50px, 0);
    }
    30% {
        clip: rect(59px, 9999px, 50px, 0);
    }
    35% {
        clip: rect(80px, 9999px, 96px, 0);
    }
    40% {
        clip: rect(7px, 9999px, 39px, 0);
    }
    45% {
        clip: rect(62px, 9999px, 90px, 0);
    }
    50% {
        clip: rect(85px, 9999px, 84px, 0);
    }
    55% {
        clip: rect(89px, 9999px, 51px, 0);
    }
    60% {
        clip: rect(88px, 9999px, 50px, 0);
    }
    65% {
        clip: rect(8px, 9999px, 82px, 0);
    }
    70% {
        clip: rect(80px, 9999px, 23px, 0);
    }
    75% {
        clip: rect(22px, 9999px, 52px, 0);
    }
    80% {
        clip: rect(96px, 9999px, 44px, 0);
    }
    85% {
        clip: rect(84px, 9999px, 27px, 0);
    }
    90% {
        clip: rect(32px, 9999px, 71px, 0);
    }
    95% {
        clip: rect(85px, 9999px, 35px, 0);
    }
    100% {
        clip: rect(24px, 9999px, 23px, 0);
    }
}
.glitch:before {
    content: attr(data-text);
    position: absolute;
    left: -2px;
    text-shadow: 1px 0 blue;
    top: 0;
    color: white;
    background: rgba(0, 0, 0, 0.25);
    overflow: hidden;
    clip: rect(0, 900px, 0, 0);
    animation: noise-anim-2 3s infinite linear alternate-reverse;
}