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Showing content from https://developer.mozilla.org/en-US/docs/Web/CSS/transform-box below:

transform-box - CSS | MDN

/* Keyword values */
transform-box: content-box;
transform-box: border-box;
transform-box: fill-box;
transform-box: stroke-box;
transform-box: view-box;

/* Global values */
transform-box: inherit;
transform-box: initial;
transform-box: revert;
transform-box: revert-layer;
transform-box: unset;

The transform-box property is specified as one of the keyword values listed below.

Values

content-box: The content box is used as the reference box. The reference box of a <table> is the border box of its table wrapper box, not its table box.
border-box: The border box is used as the reference box. The reference box of a <table> is the border box of its table wrapper box, not its table box.
fill-box: The object bounding box is used as the reference box. For elements with associated CSS layout box, acts as content-box.
stroke-box: The stroke bounding box is used as the reference box. For elements with associated CSS layout box, acts as border-box.
view-box: The nearest SVG viewport is used as the reference box. If a viewBox attribute is specified for the SVG viewport creating element, the reference box is positioned at the origin of the coordinate system established by the viewBox attribute, and the dimension of the reference box is set to the width and height values of the viewBox attribute. For elements with associated CSS layout box, acts as border-box.

Formal definition Formal syntax

transform-box = 
  content-box  |
  border-box   |
  fill-box     |
  stroke-box   |
  view-box

Examples SVG transform-origin scoping

In this example we have an SVG:

<svg id="svg" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 50 50">
  <g>
    <circle id="center" fill="red" r="1" transform="translate(25 25)" />
    <circle id="boxcenter" fill="blue" r=".5" transform="translate(15 15)" />
    <rect
      id="box"
      x="10"
      y="10"
      width="10"
      height="10"
      rx="1"
      ry="1"
      stroke="black"
      fill="none" />
  </g>
</svg>

In the CSS we have an animation that uses a transform to rotate the rectangle infinitely. transform-box: fill-box is used to make the transform-origin the center of the bounding box, so the rectangle spins in place. Without it, the transform origin is the center of the SVG canvas, and so you get a very different effect.

svg {
  width: 80vh;
  border: 1px solid #d9d9d9;
  position: absolute;
  margin: auto;
  inset: 0;
}

#box {
  transform-origin: 50% 50%; /* anything other than `0 0` to see the effect */
  transform-box: fill-box;
  animation: rotate-box 3s linear infinite;
}

@keyframes rotate-box {
  to {
    transform: rotate(360deg);
  }
}

Specifications Browser compatibility

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