Pure CSS3는 페이지 로딩 애니메이션 효과를 구현합니다(코드 포함).

<div class="box">
   <div class="r1"></div>
   <div class="r2"></div>
   <div class="r3"></div>
   <div class="r4"></div>
   <div class="r5"></div>
</div>

.box {
    margin: 100px auto;
    width: 50px;
    height: 60px;
   }   
   .box>div {
    background-color: #67CF22;
    height: 100%;
    width: 6px;
    display: inline-block;
    -webkit-animation: stretchdelay 1.2s infinite ease-in-out;
    animation: stretchdelay 1.2s infinite ease-in-out;
   }   
   .box .r2 {
    -webkit-animation-delay: -1.1s;
    animation-delay: -1.1s;
   }   
   .box .r3 {
    -webkit-animation-delay: -1.0s;
    animation-delay: -1.0s;
   }   
   .box .r4 {
    -webkit-animation-delay: -0.9s;
    animation-delay: -0.9s;
   }   
   .box .r5 {
    -webkit-animation-delay: -0.8s;
    animation-delay: -0.8s;
   }   
   @-webkit-keyframes stretchdelay {
    0%,
    40%,
    100% {
     -webkit-transform: scaleY(0.4)
    }
    20% {
     -webkit-transform: scaleY(1.0)
    }
   }   
   @keyframes stretchdelay {
    0%,
    40%,
    100% {
     transform: scaleY(0.4);
     -webkit-transform: scaleY(0.4);
    }
    20% {
     transform: scaleY(1.0);
     -webkit-transform: scaleY(1.0);
    }
   }