This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
<filter> element can define a region to which a given filter effect applies and can provide a resolution for any intermediate continuous tone images used to process any raster-based filter primitives.
filterRes attribute takes the form
x-pixels [y-pixels], and indicates the width and height of the intermediate images in pixels.
Take care when assigning a non-default value to this attribute. Too small of a value may result in unwanted pixelation in the result. Too large of a value may result in slow processing and large memory usage.
Note that negative values or zero values disable the rendering of the element which referenced the filter.
|Normative document||SVG 1.1 (2nd Edition)|
The following elements can use the