Description Available Attribute Values Used by the Elements
Governs whether to interpret the units for coordinates of the contents of mask either as as fractions of the bounding box (objectBoundingBox) or using the units inherited from current user coordinate system ( userSpaceOnUse).
The value can be either of the one of the following:
Specifies that the coordinate system for contents is given terms of the user coordinate system in effect at the time of mask referencing.
Specifies that the coordinate system for contents is given terms of the bounding box of the object to which the mask is applied.
mask
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