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              <svg>
  <defs>
    <clipPath id="cp-roundcorners">
      <rect width="100%" height="100%" fill="gold" fill-opacity=".5"
        rx="60"/>
    </clipPath>
    <symbol id="s-wavy-path">
      <g transform="translate(-50,60)">
        <path d="M903,4.5 C903,4.5 854,42.5341344 803.148089,42.2925317 C753.981141,42.0589344 753.709827,1.76742786 703.354914,2.13371392 C653,2.49999998 652.817934,41.4339085 602.908967,41.9840226 C553,42.5341367 552.597027,1.1857595 503.173513,1.84287976 C453.75,2.50000002 452.074424,40.9050063 403.037212,41.7195701 C354,42.5341339 350.880655,2.72739994 302.940328,2.61369997 C255,2.5 253.131621,42.5536648 203.06581,42.5341357 C153,42.5146065 154,2.5 103.175781,2.5 C52.3515625,2.5 3,42.5341344 3,42.5341344"></path>
      </g>
    </symbol>
    
    <symbol id="s-wavy-path-vert">
      <use xlink:href="#s-wavy-path" transform=" translate(130,-30) rotate(90)"/>
    </symbol>
    
    <mask id="m-wavy-lines">
      <use xlink:href="#s-wavy-path" y="-100" class="u-line"/>
      <use xlink:href="#s-wavy-path" y="-50" class="u-line"/>
      <use xlink:href="#s-wavy-path" class="u-line"/>
      <use xlink:href="#s-wavy-path" y="50" class="u-line"/>
      <use xlink:href="#s-wavy-path" y="100" class="u-line"/>
      <use xlink:href="#s-wavy-path" y="150" class="u-line"/>
      <use xlink:href="#s-wavy-path" y="200" class="u-line"/>
      <use xlink:href="#s-wavy-path" y="250" class="u-line"/>
      <use xlink:href="#s-wavy-path" y="300" class="u-line"/>
      <use xlink:href="#s-wavy-path" y="350" class="u-line"/>
      <use xlink:href="#s-wavy-path" y="400" class="u-line"/>
      <use xlink:href="#s-wavy-path" y="450" class="u-line"/>
    </mask>
    
    <mask id="m-wavy-lines-vertical">
      <use xlink:href="#s-wavy-path-vert" x="-50" class="u-line"/>
      <use xlink:href="#s-wavy-path-vert" class="u-line"/>
      <use xlink:href="#s-wavy-path-vert" x="50" class="u-line"/>
      <use xlink:href="#s-wavy-path-vert" x="100" class="u-line"/>
      <use xlink:href="#s-wavy-path-vert" x="150" class="u-line"/>
      <use xlink:href="#s-wavy-path-vert" x="200" class="u-line"/>
      <use xlink:href="#s-wavy-path-vert" x="250" class="u-line"/>
      <use xlink:href="#s-wavy-path-vert" x="300" class="u-line"/>
      <use xlink:href="#s-wavy-path-vert" x="350" class="u-line"/>
      <use xlink:href="#s-wavy-path-vert" x="400" class="u-line"/>
      <use xlink:href="#s-wavy-path-vert" x="450" class="u-line"/>
      <use xlink:href="#s-wavy-path-vert" x="500" class="u-line"/>
      <use xlink:href="#s-wavy-path-vert" x="550" class="u-line"/>
      <use xlink:href="#s-wavy-path-vert" x="600" class="u-line"/>
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      <use xlink:href="#s-wavy-path-vert" x="800" class="u-line"/>
      <use xlink:href="#s-wavy-path-vert" x="850" class="u-line"/>
    </mask>
    
    <symbol id="s-path">
      <path d="M0,0 0,800" transform="translate(25,0)"/>
    </symbol>
    
    <mask id="m-lines">
      <use xlink:href="#s-path" class="u-line"/>
      <use xlink:href="#s-path" x="50" class="u-line"/>
      <use xlink:href="#s-path" x="100" class="u-line"/>
      <use xlink:href="#s-path" x="150" class="u-line"/>
      <use xlink:href="#s-path" x="200" class="u-line"/>
      <use xlink:href="#s-path" x="250" class="u-line"/>
      <use xlink:href="#s-path" x="300" class="u-line"/>
      <use xlink:href="#s-path" x="350" class="u-line"/>
      <use xlink:href="#s-path" x="400" class="u-line"/>
      <use xlink:href="#s-path" x="450" class="u-line"/>
      <use xlink:href="#s-path" x="500" class="u-line"/>
      <use xlink:href="#s-path" x="550" class="u-line"/>
      <use xlink:href="#s-path" x="600" class="u-line"/>
      <use xlink:href="#s-path" x="650" class="u-line"/>
      <use xlink:href="#s-path" x="700" class="u-line"/>
      <use xlink:href="#s-path" x="750" class="u-line"/>
      <use xlink:href="#s-path" x="800" class="u-line"/>
    </mask>
    
    <mask id="m-circles">
      <circle r="5" cx="0" cy="530" class="u-line"/>
      <circle r="50" cx="0" cy="530" class="u-line"/>
      <circle r="100" cx="0" cy="530" class="u-line"/>
      <circle r="150" cx="0" cy="530" class="u-line"/>
      <circle r="200" cx="0" cy="530" class="u-line"/>
      <circle r="250" cx="0" cy="530" class="u-line"/>
      <circle r="300" cx="0" cy="530" class="u-line"/>
      <circle r="350" cx="0" cy="530" class="u-line"/>
      <circle r="400" cx="0" cy="530" class="u-line"/>
      <circle r="450" cx="0" cy="530" class="u-line"/>
      <circle r="500" cx="0" cy="530" class="u-line"/>
      <circle r="550" cx="0" cy="530" class="u-line"/>
      <circle r="600" cx="0" cy="530" class="u-line"/>
      <circle r="650" cx="0" cy="530" class="u-line"/>
      <circle r="700" cx="0" cy="530" class="u-line"/>
      <circle r="750" cx="0" cy="530" class="u-line"/>
      <circle r="800" cx="0" cy="530" class="u-line"/>
      <circle r="850" cx="0" cy="530" class="u-line"/>
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      <circle r="950" cx="0" cy="530" class="u-line"/>
      <circle r="1000" cx="0" cy="530" class="u-line"/>
    </mask>
    
    <filter id="fl-shadow" filterUnits="userSpaceOnUse" x="0" y="0"
              width="800" height="500">
        <feGaussianBlur in="SourceAlpha" stdDeviation="2" result="blur"/>
        <feOffset in="blur" dx="0" dy="0" result="offsetBlr" />
        <feFlood flood-color="rgba(0,0,0,.9)"/>
        <feComposite operator="in" in2="offsetBlr" result="colBlur"/>
        <feMerge>
          <feMergeNode in="colBlur"/>
          <feMergeNode in="SourceGraphic"/>
        </feMerge>
      </filter>
  </defs>
  
  <text y="260" x="400" text-anchor="middle">SVG is magic.</text>
  <g class="g-images" clip-path="url(#cp-roundcorners)">
    
    <image xlink:href="https://img-fotki.yandex.ru/get/6208/5091629.73/0_63193_9ffa75d7_orig" width="100%" height="100%" class="image im-mask-waves-2"/>
    
    <image xlink:href="https://img-fotki.yandex.ru/get/5808/yoksel.62/0_513b2_f8213a6f_orig" width="100%" height="100%" class="image im-mask-waves-1"/>
    
    <image xlink:href="https://img-fotki.yandex.ru/get/4705/yoksel.62/0_50544_255fa1d3_orig" width="100%" height="100%" class="image im-mask-lines"/>
    
    <image xlink:href="https://img-fotki.yandex.ru/get/5604/yoksel.60/0_4f376_c12baf67_orig" width="100%" height="100%" class="image im-mask-circles"/>
    
  </g>

</svg>
            
          
!
            
              $duration: 25s;
$steps: 4;
$step: $duration/$steps;

$mask-duration: $step;

$vert-max: 28*2;
$vert-duration: $mask-duration;
$vert-step: $vert-duration/$vert-max;


BODY {
  background: #111;
}

svg {
  display: block;
  position: absolute;
  width: 800px;
  height: 532px;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  margin: auto;
  overflow: visible;
}

text {
  fill: #222;
  fill-opacity: .5;
  font-size: 3em;
  filter: url(#fl-shadow)
}

.image {
  animation: opacity $duration infinite step-start; 
  opacity: 0;
  @for $item from 1 through $steps {
    &:nth-child(#{$steps}n + #{$item}) {
      animation-delay: -#{$step * $item};
    }
  }
}

@keyframes opacity {
  0% {
    opacity: 1;
  }
  25% {
    opacity: 1;
  }
  26% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
  
}

.u-line {
  fill: none;
  stroke: white;
  stroke-width: 0;
  stroke-opacity: 0;

  animation: stroke-width-line $vert-duration infinite;
  @for $item from 1 through $vert-max {
    &:nth-child(#{$vert-max}n + #{$item}){
      animation-delay: $vert-step * $item;
    }
  }
}




@keyframes stroke-width-line {
  20% {
    stroke-width: 51;
    stroke-opacity: 1;
  }
  60% {
    stroke-width: 51;
    stroke-opacity: 1
  }
  70% {
    stroke-width: 0;
    stroke-opacity: 0;
  }
}

image {
/*   display: none; */
}

.im-mask-waves-1 {
  mask: url(#m-wavy-lines);
}
.im-mask-waves-2 {
  mask: url(#m-wavy-lines-vertical);
}
.im-mask-lines {
  mask: url(#m-lines);
}

.im-mask-circles {
  mask: url(#m-circles);
}
            
          
!
999px
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