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---
title: "SVGMarkerElement: refX property"
short-title: refX
slug: Web/API/SVGMarkerElement/refX
page-type: web-api-instance-property
browser-compat: api.SVGMarkerElement.refX
---
{{APIRef("SVG")}}
The **`refX`** read-only property of the {{domxref("SVGMarkerElement")}} interface returns an {{domxref("SVGAnimatedLength")}} object containing the value of the {{SVGattr("refX")}} attribute of the {{SVGElement("marker")}}.
## Value
An {{domxref("SVGAnimatedLength")}} object. The `baseVal` property of this object returns an {{domxref("SVGLength")}}, the value of which returns the `refX`.
## Examples
The `markerWidth` property returns an {{domxref("SVGAnimatedLength")}} which contains an {{domxref("SVGLength")}} with the value of the {{SVGattr("refX")}} attribute.
```html
<svg id="svg" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<defs>
<marker
id="arrow"
viewBox="0 0 10 10"
refX="5"
refY="5"
markerWidth="6"
markerHeight="6"
orient="auto-start-reverse">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
</svg>
```
```js
let marker = document.getElementById("arrow");
console.log(marker.refX.baseVal.value); // 5
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}