The stdDeviation attribute defines the standard deviation for the blur operation.

Only one element is using this attribute: <feGaussianBlur>

<svg viewBox="0 0 480 200" xmlns="">
  <filter id="gaussianBlur1">
    <feGaussianBlur stdDeviation="1" />
  <filter id="gaussianBlur2">
    <feGaussianBlur stdDeviation="5" />
  <filter id="gaussianBlur3" x="-30%" y="-30%" width="160%" height="160%">
    <feGaussianBlur stdDeviation="10" />

  <circle cx="100" cy="100" r="50" style="filter: url(#gaussianBlur1);" />
  <circle cx="100" cy="100" r="50" style="filter: url(#gaussianBlur2); transform: translateX(140px);" />
  <circle cx="100" cy="100" r="50" style="filter: url(#gaussianBlur3); transform: translateX(280px);" />

Usage notes

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). If stdDeviation 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.


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