stdDeviation attribute defines the standard deviation for the blur operation. If two <number>s 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.
If the attribute is not specified, then the effect is as if a value of 0 were specified.
|Normative document||SVG 1.1 (2nd Edition)|
A pair of <number>s, where the second <number> is optional.
number-optional-number ::= number | number, number
The following elements can use the