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---
title: markerUnits
slug: Web/SVG/Attribute/markerUnits
page-type: svg-attribute
browser-compat: svg.elements.marker.markerUnits
---
{{SVGRef}}
The **`markerUnits`** attribute defines the coordinate system for the {{SVGAttr("markerWidth")}} and {{SVGAttr("markerHeight")}} attributes and the contents of the {{SVGElement("marker")}}.
You can use this attribute with the following SVG elements:
- {{SVGElement("marker")}}
## Usage notes
<table class="properties">
<tbody>
<tr>
<th scope="row">Value</th>
<td><code>userSpaceOnUse</code> | <code>strokeWidth</code></td>
</tr>
<tr>
<th scope="row">Default value</th>
<td><code>strokeWidth</code></td>
</tr>
<tr>
<th scope="row">Animatable</th>
<td>Yes</td>
</tr>
</tbody>
</table>
- `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 {{SVGAttr("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 {{SVGAttr("stroke-width")}} attribute) in place for the graphic object referencing the marker.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{SVGElement("marker")}}
- {{SVGAttr("markerWidth")}}
- {{SVGAttr("markerHeight")}}
- {{SVGAttr("stroke-width")}}