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CSS

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HTML 

              
                <div class="c-loader">
  <svg version="1.1" class="c-loader__svg" xmlns="http://www.w3.org/2000/svg" x="0" y="0" viewBox="0 0 104 176" xml:space="preserve">
    <path class="c-loader__scaffolding" d="M0 12v12h8v40h8v8h8v8h8v16h-8v8h-8v8H8v40H0v24h104v-24h-8v-40h-8v-8h-8v-8h-8V80h8v-8h8v-8h8V24h8V0H0v12zm88 0v4H16V8h72v4zm0 28v16h-8v8h-8v8h-8v8h-8v16h8v8h8v8h8v8h8v32H16v-32h8v-8h8v-8h8v-8h8V80h-8v-8h-8v-8h-8v-8h-8V24h72v16zm0 124v4H16v-8h72v4z" />
    <path d="M24 36v4h8v-8h-8v4z" class="c-loader__block1" />
    <path d="M40 36v4h8v-8h-8v4z" class="c-loader__block2" />
    <path d="M56 36v4h8v-8h-8v4z" class="c-loader__block3" />
    <path d="M72 36v4h8v-8h-8v4z" class="c-loader__block4" />
    <path d="M32 44v4h8v-8h-8v4z" class="c-loader__block5" />
    <path d="M48 44v4h8v-8h-8v4z" class="c-loader__block6" />
    <path d="M64 44v4h8v-8h-8v4z" class="c-loader__block7" />
    <path d="M40 52v4h8v-8h-8v4z" class="c-loader__block8" />
    <path d="M56 52v4h8v-8h-8v4z" class="c-loader__block9" />
    <path d="M48 60v4h8v-8h-8v4z" class="c-loader__block10" />
    <path d="M48 76v4h8v-8h-8v4z" class="c-loader__block11" />
    <path d="M48 108v4h8v-8h-8v4z" class="c-loader__block12" />
  </svg>
</div>
!

CSS 

              
                body {
  display: grid;
  place-items: center;
  height: 100vh;
  margin: 0;
}

.c-loader {
  width: 104px;
}
!

JS 

              
                /**
 * Old school Window Loader with GSAP
 * @author Daphne Smit <hi@daphnesmit.nl>
 */
const delay = 0.08
const tl = new TimelineMax({ repeat: -1, repeatDelay: delay })


tl
  .to(".c-loader__block1", 0, { opacity: 0, delay }, delay)
  .to(".c-loader__block11", 0, { x: 0, y: 24, delay }, delay)
  .to(".c-loader__block12", 0, { x: -8, y: 40, delay }, delay)

  .to(".c-loader__block1", 0, { opacity: 1, x: 24, y: 72, delay: delay * 2 },  delay * 2)
  .to(".c-loader__block3", 0, { x: -8, y: 40, delay: delay * 2 }, delay * 2)
  .to(".c-loader__block11", 0, { x: 8, y: 72, delay: delay * 2 }, delay * 2)

  .to(".c-loader__block1", 0, { x: 24, y: 104, delay: delay * 3 }, delay * 3)
  .to(".c-loader__block3", 0, { x: -8, y: 64, delay: delay * 3 }, delay * 3)
  .to(".c-loader__block4", 0, { x: -24, y: 64, delay: delay * 3 }, delay * 3)

  .to(".c-loader__block2", 0, { x: 8, y: 72, delay: delay * 4 }, delay * 4)
  .to(".c-loader__block3", 0, { x: 16, y: 112, delay: delay * 4 }, delay * 4)
  .to(".c-loader__block4", 0, { x: -24, y: 40, delay: delay * 4 }, delay * 4)

  .to(".c-loader__block2", 0, { x: -8, y: 104, delay: delay * 5 }, delay * 5)
  .to(".c-loader__block4", 0, { x: -24, y: 64, delay: delay * 5 }, delay * 5)
  .to(".c-loader__block6", 0, { x: 0, y: 56, delay: delay * 5 }, delay * 5)

  .to(".c-loader__block4", 0, { x: -48, y: 112, delay: delay * 6 }, delay * 6)
  .to(".c-loader__block5", 0, { x: 16, y: 64, delay: delay * 6 }, delay * 6)
  .to(".c-loader__block6", 0, { x: 0, y: 32, delay: delay * 6 }, delay * 6)

  .to(".c-loader__block5", 0, { x: 32, y: 96, delay: delay * 7 }, delay * 7)
  .to(".c-loader__block6", 0, { x: 0, y: 56, delay: delay * 7 }, delay * 7)
  .to(".c-loader__block7", 0, { x: -16, y: 56, delay: delay * 7 }, delay * 7)

  .to(".c-loader__block6", 0, { x: 8, y: 88, delay: delay * 8 }, delay * 8)
  .to(".c-loader__block7", 0, { x: -16, y: 64, delay: delay * 8 }, delay * 8)
  .to(".c-loader__block9", 0, { x: -8, y: 24, delay: delay * 8 }, delay * 8)

  .to(".c-loader__block7", 0, { x: -24, y: 88, delay: delay * 9 }, delay * 9)
  .to(".c-loader__block8", 0, { x: 8, y: 24, delay: delay * 9 }, delay * 9)
  .to(".c-loader__block9", 0, { x: -8, y: 56, delay: delay * 9 }, delay * 9)

  .to(".c-loader__block8", 0, { x: 8, y: 48, delay: delay * 10 }, delay * 10)
  .to(".c-loader__block9", 0, { x: -8, y: 72, delay: delay * 10 }, delay * 10)
  .to(".c-loader__block10", 0, { x: 0, y: 40, delay: delay * 10 }, delay * 10)

  .to(".c-loader__block8", 0, { x: 8, y: 72, delay: delay * 11 }, delay * 11)
  .to(".c-loader__block10", 0, { x: 0, y: 64, delay: delay * 11 }, delay * 11)


  .to(".c-loader__svg", 0, { rotation: -45, delay: delay * 12 }, delay * 12)
  .to(".c-loader__block1", 0, { rotation: -45, x: 20, y: 110, delay: delay * 12 }, delay * 12)
  .to(".c-loader__block2", 0, { rotation: -45, x: -7, y: 110, delay: delay * 12 }, delay * 12)
  .to(".c-loader__block3", 0, { rotation: -45, x: -23, y: 88, delay: delay * 12 }, delay * 12)
  .to(".c-loader__block4", 0, { rotation: -45, x: -50, y: 110, delay: delay * 12 }, delay * 12)
  .to(".c-loader__block5", 0, { rotation: -45, x: 23, y: 102, delay: delay * 12 }, delay * 12)
  .to(".c-loader__block6", 0, { rotation: -45, x: 18, y: 102, delay: delay * 12 }, delay * 12)
  .to(".c-loader__block7", 0, { rotation: -45, x: -20, y: 91, delay: delay * 12 }, delay * 12)
  .to(".c-loader__block8", 0, { rotation: -45, x: 4, y: 72, delay: delay * 12 }, delay * 12)
  .to(".c-loader__block9", 0, { rotation: -45, x: -12, y: 61, delay: delay * 12 }, delay * 12)
  .to(".c-loader__block10", 0, { rotation: -45, x: 7, y: 75, delay: delay * 12 }, delay * 12)
  .to(".c-loader__block11", 0, { rotation: -45, x: -15, y: 59, delay: delay * 12 }, delay * 12)
  .to(".c-loader__block12", 0, { rotation: -45, x: -26, y: 27, delay: delay * 12 }, delay * 12)


  .to(".c-loader__svg", 0, { rotation: -90, delay: delay * 13 }, delay * 13)
  .to(".c-loader__block6", 0, { rotation: -45, x: 7, y: 80, delay: delay * 13 }, delay * 13)


  .to(".c-loader__svg", 0, { rotation: -135, delay: delay * 14 }, delay * 14)
  .to(".c-loader__block5", 0, { rotation: -45, x: 23, y: 69, delay: delay * 14 }, delay * 14)
!
999px

Console