<span class="type" style="--n:11">CSS is Cool</span>

<script>
if (CSS.paintWorklet) {              CSS.paintWorklet.addModule('/t_afif/pen/MWojOQG.js');
}
</script>
@property --f-o{
  syntax: '<number>';
  inherits: false;
  initial-value: 1;
}


body {
  font-family: monospace;
  font-weight: 700;
  font-size:80px;
  padding:20px;
  background:#005F6B;
  color:#00DFFC
}

.type {
  --f-o:1;
  --f-n:20;
  --f-m:30;
  -webkit-mask:
      paint(fragmentation)    calc(var(--n)*1ch) 0/1ch 100%,
      linear-gradient(#000 0 0) 0 0/calc(var(--n)*1ch) 100%;
  -webkit-mask-repeat:no-repeat;
  animation:
    b .6s linear infinite both 1.5s,
    t calc(var(--n)*.6s) steps(var(--n)) both 1.5s;
}


@keyframes t{
  from {
    -webkit-mask-size:1ch 100%,0 100%;
    -webkit-mask-position:0 0,0 0;
  }
}

@keyframes b{
  from {--f-o:0}
}
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 = 15; 
   
    const mask = 0xffffffff;
    const seed = 11;
    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, j*h, w, h);
        }
      }
  }

})

External CSS

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External JavaScript

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