Description Available Attribute Values Used by the Elements
Determines how to interpret marker coordinates, the choices being either using the stroke width as 1 unit (strokeWidthst), or using the units inherited from current user coordinate system ( userSpaceOnUse).
The value can be either of the one of the following:
Specifies that 'markerWidth', 'markerHeight' and any coordinate values of marker contents are in terms of the user coordinate system in effect at the time when this marker is referenced.
Specifies that 'markerWidth', 'markerHeight' and any-coordinate values of the marker contents are given in terms of a coordinate system which has been scaled in such a way that the current stroke has a width of 1 in that system.
marker
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