CSS - transform-box Property

Quiz

The CSS property transform-box determines the layout box to which transformation properties relate, such as transform, translate, scale, rotate, and transform-origin.

Possible values

The CSS property transform-box can contain one of the following keyword values:

content-box: This is the default value. The transformations are applied with respect to the element's content box.
border-box: The transformations are applied with respect to the element's border box.
fill-box: The transformations are applied with respect to the paint area of the element, excluding any stroke.
stroke-box: The transformations are applied with respect to the stroke bounding box, which includes the stroked area and the space it occupies.
view-box: The transformations are applied with respect to the nearest SVG viewport.

Applies to

All the transformable elements.

Syntax

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

CSS transform-box - Example

By comparing the the boxes side by side, you should be able to observe that the box transformation as demonstrated below:

<html>
<head>
<style>
   svg {
      width: 120vh;
      border: 1px solid #d9d9d9;
      position: relative;
      margin: auto;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
   }

   #box {
      transform-origin: 50% 50%; /* anything other than `0 0` to see the effect */
      transform-box: content-box;
      animation: rotateBox 3s linear infinite;
   }
   #box1 {
      transform-origin: 50% 50%; /* anything other than `0 0` to see the effect */
      transform-box: border-box;
      animation: rotateBox 3s linear infinite;
   }
   #box2 {
      transform-origin: 50% 50%; /* anything other than `0 0` to see the effect */
      transform-box: view-box;
      animation: rotateBox 3s linear infinite;
   }
   #box3 {
      transform-origin: 50% 50%; /* anything other than `0 0` to see the effect */
      transform-box: fill-box;
      animation: rotateBox 3s linear infinite;
   }
   #box4 {
      transform-origin: 50% 50%; /* anything other than `0 0` to see the effect */
      transform-box: stroke-box;
      animation: rotateBox 3s linear infinite;
   }

   @keyframes rotateBox {
      to {
         transform: rotate(360deg);
      }
   }
</style>
</head>
<body>
   <svg id="svg" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 50 50">
      <text x="0" y="5" fill="red" font-size="5px">content-box</text>
      <g stroke-width="1">
         <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>
      <br/>
      <svg id="svg" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 50 50">
      <text x="0" y="5" fill="red" font-size="5px">border-box</text>
      <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="box1"
            x="10"
            y="10"
            width="10"
            height="10"
            rx="1"
            ry="1"
            stroke="black"
            fill="none" />
      </g>
      </svg>
      <br/>
      <svg id="svg" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 50 50">
      <text x="0" y="5" fill="red" font-size="5px">view-box</text>
      <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="box2"
            x="10"
            y="10"
            width="10"
            height="10"
            rx="1"
            ry="1"
            stroke="black"
            fill="none" />
      </g>
      </svg>
      <br/>
      <svg id="svg" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 50 50">
      <text x="0" y="5" fill="red" font-size="5px">fill-box</text>
      <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="box3"
            x="10"
            y="10"
            width="10"
            height="10"
            rx="1"
            ry="1"
            stroke="black"
            fill="none" />
      </g>
      </svg>
      <br/>
      <svg id="svg" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 50 50">
      <text x="0" y="5" fill="red" font-size="5px">stroke-box</text>
      <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="box4"
            x="10"
            y="10"
            width="10"
            height="10"
            rx="1"
            ry="1"
            stroke="black"
            fill="none" />
      </g>
      </svg>
</body>
</html>

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