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CSS Clip剪切元素动画实例

1.CSS

.fixed {    position: fixed;    width: 90px;    height: 90px;    background: red;    border: 0px solid blue;    left: 100px;    top: 100px;}    .fixed:before {        position: absolute;        width: 100px;        height: 100px;        margin: -5px;        content: ‘‘;        box-shadow: inset 0px 0px 0px 2px blue;        animation: animateOne linear 4s infinite;    }    .fixed:after {        position: absolute;        width: 100px;        height: 100px;        margin: -5px;        content: ‘‘;        box-shadow: inset 0px 0px 0px 2px blue;        animation: animateOne linear 4s infinite;        animation-delay: -2s; /*此处设置负值,提前进入指定状态*/    }@keyframes animateOne {    0%,100% {        clip: rect(0px,100px,5px,0px);    }    25% {        clip: rect(0px,5px,100px,0px);    }    50% {        clip: rect(95px,100px,100px,0px);    }    75% {        clip: rect(0px,100px,100px,95px);    }}

注:

animation-delay 单独使用时注意两点:
1.需要放在animation属性后面
2.可以设置负数,调整动画开始的状态

显示结果:

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CSS Clip剪切元素实例

CSS Clip属性

CSS Clip剪切元素动画实例