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HTML

              
                //
  svg(height="1200", width="800", xmlns="http://www.w3.org/2000/svg")
    defs
      clippath#cut-left
        rect(x="0", y="0", width="75%", height="100%")
    image(height="1200", width="800", href="https://picsum.photos/1200/800", clip-path="url(#cut-left)")
//
  image did not work, it would not load
  but contained svg worked, so an image built in SVG would work.
h1 Stagger
.text easier to stagger if solid background color.
              
            
!

CSS

              
                @function urlbuilder($offset) {
  @return url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg"><defs><clipPath id="cut-50"><rect x="#{$offset}" y="0" width="25%" height="100%" /></clipPath></defs><g clip-path="url(%23cut-50)"><rect fill="%23aa3333" width="100%" height="100%"/><path fill="%23FF7" d="M1102.5 734.8c2.5-1.2 24.8-8.6 25.6-7.5.5.7-3.9 23.8-4.6 24.5C1123.3 752.1 1107.5 739.5 1102.5 734.8zM1226.3 229.1c0-.1-4.9-9.4-7-14.2-.1-.3-.3-1.1-.4-1.6-.1-.4-.3-.7-.6-.9-.3-.2-.6-.1-.8.1l-13.1 12.3c0 0 0 0 0 0-.2.2-.3.5-.4.8 0 .3 0 .7.2 1 .1.1 1.4 2.5 2.1 3.6 2.4 3.7 6.5 12.1 6.5 12.2.2.3.4.5.7.6.3 0 .5-.1.7-.3 0 0 1.8-2.5 2.7-3.6 1.5-1.6 3-3.2 4.6-4.7 1.2-1.2 1.6-1.4 2.1-1.6.5-.3 1.1-.5 2.5-1.9C1226.5 230.4 1226.6 229.6 1226.3 229.1zM33 770.3C33 770.3 33 770.3 33 770.3c0-.7-.5-1.2-1.2-1.2-.1 0-.3 0-.4.1-1.6.2-14.3.1-22.2 0-.3 0-.6.1-.9.4-.2.2-.4.5-.4.9 0 .2 0 4.9.1 5.9l.4 13.6c0 .3.2.6.4.9.2.2.5.3.8.3 0 0 .1 0 .1 0 7.3-.7 14.7-.9 22-.6.3 0 .7-.1.9-.3.2-.2.4-.6.4-.9C32.9 783.3 32.9 776.2 33 770.3z"/><path fill="%235ff" d="M171.1 383.4c1.3-2.5 14.3-22 15.6-21.6.8.3 11.5 21.2 11.5 22.1C198.1 384.2 177.9 384 171.1 383.4zM596.4 711.8c-.1-.1-6.7-8.2-9.7-12.5-.2-.3-.5-1-.7-1.5-.2-.4-.4-.7-.7-.8-.3-.1-.6 0-.8.3L574 712c0 0 0 0 0 0-.2.2-.2.5-.2.9 0 .3.2.7.4.9.1.1 1.8 2.2 2.8 3.1 3.1 3.1 8.8 10.5 8.9 10.6.2.3.5.4.8.4.3 0 .5-.2.6-.5 0 0 1.2-2.8 2-4.1 1.1-1.9 2.3-3.7 3.5-5.5.9-1.4 1.3-1.7 1.7-2 .5-.4 1-.7 2.1-2.4C596.9 713.1 596.8 712.3 596.4 711.8zM727.5 179.9C727.5 179.9 727.5 179.9 727.5 179.9c.6.2 1.3-.2 1.4-.8 0-.1 0-.2 0-.4.2-1.4 2.8-12.6 4.5-19.5.1-.3 0-.6-.2-.8-.2-.3-.5-.4-.8-.5-.2 0-4.7-1.1-5.7-1.3l-13.4-2.7c-.3-.1-.7 0-.9.2-.2.2-.4.4-.5.6 0 0 0 .1 0 .1-.8 6.5-2.2 13.1-3.9 19.4-.1.3 0 .6.2.9.2.3.5.4.8.5C714.8 176.9 721.7 178.5 727.5 179.9zM728.5 178.1c-.1-.1-.2-.2-.4-.2C728.3 177.9 728.4 178 728.5 178.1z"/><g fill="%23FFF"><path d="M699.6 472.7c-1.5 0-2.8-.8-3.5-2.3-.8-1.9 0-4.2 1.9-5 3.7-1.6 6.8-4.7 8.4-8.5 1.6-3.8 1.7-8.1.2-11.9-.3-.9-.8-1.8-1.2-2.8-.8-1.7-1.8-3.7-2.3-5.9-.9-4.1-.2-8.6 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}
body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-content: center;
  font-family: system-ui, sans-serif;
  font-size: 2rem;
  background-repeat: no-repeat;
  background-image: urlbuilder(0%), urlbuilder(25%), urlbuilder(50%), urlbuilder(75%);
  background-size: 100vw 100vh;
 
  background-attachment: fixed;
  animation: movebg 5s linear forwards;
}
h1 {
  margin: 0;
  font-weight: 100;
  text-align: center;
}
@keyframes movebg {
  0% {
    background-color: #aa3333;
     background-position-y: 0, 0, 0, 0;
  }
  20% {
    background-position-y: -10vh, 0, 0, 0;
  }
  40% {
    background-position-y: -50vh, -20vh, 0, 0;
  }
  60% {
    background-color: #f9f6ef;
    background-position-y: -80vh, -50vh, -30vh, -5vh;
  }
  80% {
    background-position-y: -100vh, -90vh, -70vh, -50vh;
  }
  100% {
    background-color: #f9f6ef;
    background-position-y: -100vh, -100vh, -100vh, -100vh;
  }
  
}
              
            
!

JS

              
                
              
            
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