<div class="full"></div>
<script>
if (CSS.paintWorklet) {              CSS.paintWorklet.addModule('/t_afif/pen/991e8971ff66a2de4727b55d4371c878.js');
}
</script>
@property --f-o{
  syntax: '<number>';
  inherits: false;
  initial-value: 1;
}

.full {
  position:fixed;
  inset: calc(50% - 50vmax) auto auto calc(50% - 50vmax);
  width:100vmax;
  height:100vmax;
  z-index:268;
  display:grid;
  background:#fff;
}
.full:before {
  content:"";
  grid-area:1/1;
  background:#000;
  --f-n:20;
  --f-m:20;
  animation:i 3s infinite alternate;
  -webkit-mask: paint(fragmentation);
          mask: paint(fragmentation);
}

@keyframes i {
  0% ,20%  {--f-o:0}
  80%,100% {--f-o:1}
}

.full:after {
  content:"Loading...";
  grid-area:1/1;
  font-family:monospace;
  font-weight:bold;
  font-size:20vmin;
  margin:auto;
  mix-blend-mode:difference;
  color: #fff;
}
registerPaint('fragmentation', class  {

  static get inputProperties() {
    return [
      '--f-n',
      '--f-m',
      '--f-o'
    ]
  }
  
  paint(ctx, size, properties) {

    const n = properties.get('--f-n');
    const m = properties.get('--f-m');
    const o = properties.get('--f-o');
    const w = size.width/n;
    const h = size.height/m;
    const l = 10; 
   
    const mask = 0xffffffff;
    const seed = 35;
    let m_w  = (123456789 + seed) & mask;
    let m_z  = (987654321 - seed) & mask;
    let random =  function() {
      m_z = (36969 * (m_z & 65535) + (m_z >>> 16)) & mask;
      m_w = (18000 * (m_w & 65535) + (m_w >>> 16)) & mask;

      var result = ((m_z << 16) + (m_w & 65535)) >>> 0;
      result /= 4294967296;
      return result;
    }
    
    for(var i=0;i<n;i++) {
       for(var j=0;j<m;j++) {
         ctx.fillStyle = 'rgba(0,0,0,'+((random()*(l-1) + 1) - (1-o)*l)+')';
         ctx.fillRect(i*w-.5, j*h-.5, w+.5, h+.5);
        }
      }
  }

})

External CSS

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External JavaScript

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