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Filter region can be visualized, and it can be expande with x, y width and height on — all attributes in % by default.

According to the spec, it is often necessary to provide padding space because the filter effect might impact bits slightly outside the tight-fitting bounding box on a given object. For these purposes, it is possible to provide negative percentage values for ‘x’ and ‘y’, and percentages values greater than 100% for ‘width’ and ‘height’. This, for example, is why the defaults for the filter effects region are x="-10%" y="-10%" width="120%" height="120%".

If filterUnits="userSpaceOnUse", ‘x’, ‘y’, ‘width’ and ‘height’ represent values in the current user coordinate system in place at the time when the ‘filter’ is referenced (i.e., the user coordinate system for the element referencing the ‘filter’ via a ‘filter’ property).

If filterUnits="objectBoundingBox", then ‘x’, ‘y’, ‘width’ and ‘height’ represent fractions or percentages of the bounding box on the referencing element (see Object bounding box units).

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