stdDeviation

ThestdDeviation attribute defines the standard deviation for the blur operation.

You can use this attribute with the following SVG elements:

Example

html,body,svg {  height: 100%;}

html

<svg viewBox="0 0 480 200" xmlns="http://www.w3.org/2000/svg">  <filter>    <feGaussianBlur stdDeviation="1" />  </filter>  <filter>    <feGaussianBlur stdDeviation="5" />  </filter>  <filter x="-30%" y="-30%" width="160%" height="160%">    <feGaussianBlur stdDeviation="10" />  </filter>  <circle cx="100" cy="100" r="50" filter="url(#gaussianBlur1)" />  <circle cx="240" cy="100" r="50" filter="url(#gaussianBlur2)" />  <circle cx="380" cy="100" r="50" filter="url(#gaussianBlur3)" /></svg>

Value	`<number-optional-number>`
Default value	`0`
Animatable	Yes

If two numbers are provided, the first number represents a standard deviation value along the x-axis. The second value represents a standard deviation along the y-axis. If one number is provided, then that value is used for both X and Y.

A negative value is forbidden. A value of zero disables the effect of the given filter primitive (i.e., the result is the filter input image). IfstdDeviation is 0 in only one of X or Y, then the effect is that the blur is only applied in the direction that has a non-zero value.