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HTML

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HTML

              
                <svg class="parent" viewBox="0 0 500 600" class="parent">
  <rect x="0" y="0" width="500" height="600" fill="white" />
  <text transform="translate(250 50)" font-size="40" fill="#000" text-anchor="middle">Parent SVG</text>
  <svg class="nested" viewBox="0 0 500 500">
    <circle cx="50%" cy="50%" r="50%" fill="#88ce02" />
    <text transform="translate(250 260)" font-size="60" fill="#fff" text-anchor="middle">Nested</text>
  </svg>
  <rect x="0" y="500" width="500" height="100" fill="#000" />
  <g class="dragger">
    <rect x="0" y="500" width="100" height="100" fill="#444" />
    <text transform="translate(50 540)" font-size="16" fill="#fff" text-anchor="middle">Drag to scale</text>
    <text class="scaleText" transform="translate(50 570)" font-size="20" fill="#fff" text-anchor="middle">1.00</text>
  </g>
</svg>
              
            
!

CSS

              
                * {
  box-sizing: border-box;
}

body {
  padding: 0;
  margin: 0;
  overflow: hidden;
  background-color: #1B1B1B;
}

.parent {
  font-family: "Roboto", sans-serif;
	width:90%;
	height:90%;
  position: absolute;
  left: 50%;
  top:50%;
  overflow: visible;
}
              
            
!

JS

              
                console.clear();
gsap.registerPlugin(Draggable);
let data = document.querySelector(".nested").getBBox();
let text = document.querySelector(".scaleText");

// change the origins to make the nested SVG grow from that point
let originX = 250; // change to desired x scale start point
let originY = 250; // change to desired y scale start point

gsap.set(".parent", { xPercent: -50, yPercent: -50 });
gsap.set(".nested", {
  attr: { width: data.width, height: data.height, x: data.x, y: data.y }
});
gsap.set(".dragger", { x: 400 });

function scaleNested() {
  let scale = this.x / 400;
  text.innerHTML = scale.toFixed(2);
  let newSize = data.width * scale;
  let newPositionX = (1 - scale) * originX;
  let newPositionY = (1 - scale) * originY;
  gsap.set(".nested", {
    attr: { width: newSize, height: newSize, x: newPositionX, y: newPositionY }
  });
}

Draggable.create(".dragger", {
  type: "x",
  bounds: {
    minX: 0,
    maxX: 400
  },
  onDrag: scaleNested
});

              
            
!
999px

Console