Elements

You can use this attribute with the SVG elements described in the sections below.

<marker>

For <marker>, viewBox defines the position and dimension for the content of the <marker> element.

<pattern>

For <pattern>, viewBox defines the position and dimension for the content of the pattern tile.

<svg>

For <svg>, viewBox defines the position and dimension for the content of the <svg> element.

<symbol>

For <symbol>, viewBox defines the position and dimension for the content of the <symbol> element.

<view>

For <view>, viewBox defines the position and dimension for the content of the <view> element.

Examples

html,
body,
svg {
  height: 100%;
  vertical-align: top;
}
svg:not(:root) {
  display: inline-block;
}

The code snippet below includes three <svg>s with different viewBox attribute values and identical <rect> and <circle> descendants creating very different results. The size of <rect> is defined using relative units, so the visual size of the square produced looks unchanged regardless of the viewBox value. The radius length r attribute of the <circle> is the same in each case, but this user unit value is resolved against the size defined in the viewBox, producing different results in each case.

<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
  <rect x="0" y="0" width="100%" height="100%" />
  <circle cx="50%" cy="50%" r="4" fill="white" />
</svg>

<svg viewBox="0 0 10 10" xmlns="http://www.w3.org/2000/svg">
  <rect x="0" y="0" width="100%" height="100%" />
  <circle cx="50%" cy="50%" r="4" fill="white" />
</svg>

<svg viewBox="-5 -5 10 10" xmlns="http://www.w3.org/2000/svg">
  <rect x="0" y="0" width="100%" height="100%" />
  <circle cx="50%" cy="50%" r="4" fill="white" />
</svg>

The user units of r="4" are resolved against the viewBox sizes, creating dramatically different circle sizes. The exact effect of the viewBox attribute is influenced by the preserveAspectRatio attribute.

Note: Values for width or height lower or equal to 0 disable rendering of the element.

Specifications