markerUnits

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

The markerUnits attribute defines the coordinate system for the markerWidth and markerHeight attributes and the contents of the <marker>.

You can use this attribute with the following SVG elements:

Value	`userSpaceOnUse` \| `strokeWidth`
Default value	`strokeWidth`
Animatable	Yes

userSpaceOnUse: This value specifies that the markerWidth and markerHeight attributes and the contents of the <marker> element represent values in the current user coordinate system in place for the graphic object referencing the marker (i.e., the user coordinate system for the element referencing the <marker> element via a marker, marker-start, marker-mid, or marker-end property).
strokeWidth: This value specifies that the markerWidth and markerHeight attributes and the contents of the <marker> element represent values in a coordinate system which has a single unit equal the size in user units of the current stroke width (see the stroke-width attribute) in place for the graphic object referencing the marker.

Specification
Scalable Vector Graphics (SVG) 2 # MarkerUnitsAttribute

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