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The viewBox attribute defines the position and dimension, in user space, of an SVG viewport.

The value of the viewBox attribute is a list of four numbers min-x, min-y, width and height, separated by whitespace and/or a comma, which specify a rectangle in user space which is mapped to the bounds of the viewport established for the associated element.

<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
  <!--
  with relative unit such as percentage, the visual size
  of the square looks unchanged regardless of the viewBox
  -->
  <rect x="0" y="0" width="100%" height="100%"/>

  <!--
  with a large viewBox the circle looks small
  as it is using user units for the r attribute:
  4 resolved against 100 as set in the viewBox
  -->
  <circle cx="50%" cy="50%" r="4" fill="white"/>
</svg>

<svg viewBox="0 0 10 10" xmlns="http://www.w3.org/2000/svg">
  <!--
  with relative unit such as percentage, the visual size
  of the square looks unchanged regardless of the viewBox`
  -->
  <rect x="0" y="0" width="100%" height="100%"/>

  <!--
  with a small viewBox the circle looks large
  as it is using user units for the r attribute:
  4 resolved against 10 as set in the viewBox
  -->
  <circle cx="50%" cy="50%" r="4" fill="white"/>
</svg>

<svg viewBox="-5 -5 10 10" xmlns="http://www.w3.org/2000/svg">
  <!--
  The point of coordinate 0,0 is now in the center of the viewport,
  and 100% is still resolve to a width or height of 10 user units so
  the rectangle looks shifted to the bottom/right corner of the viewport
  -->
  <rect x="0" y="0" width="100%" height="100%"/>

  <!--
  With the point of coordinate 0,0 in the center of the viewport the
  value 50% is resolve to 5 which means the center of the circle is
  in the bottom/right corner of the viewport.
  -->
  <circle cx="50%" cy="50%" r="4" fill="white"/>
</svg>

The exact effect of this attribute is influenced by the preserveAspectRatio attribute.

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

Five elements are using this attribute: <marker>, <pattern>, <svg>, <symbol>, and <view>

marker

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

Value <number>?, <number>?, <number>?, <number>
Default value none
Animatable Yes

pattern

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

Value <number>?, <number>?, <number>?, <number>
Default value none
Animatable Yes

svg

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

Value <number>?, <number>?, <number>?, <number>
Default value none
Animatable Yes

symbol

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

Value <number>?, <number>?, <number>?, <number>
Default value none
Animatable Yes

view

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

Value <number>?, <number>?, <number>?, <number>
Default value none
Animatable Yes

Specification

Specification Status Comment
Scalable Vector Graphics (SVG) 2
The definition of 'viewBox' in that specification.
Candidate Recommendation  
Scalable Vector Graphics (SVG) 1.1 (Second Edition)
The definition of 'viewBox' in that specification.
Recommendation Initial definition

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