files/en-us/web/api/svgfemergeelement/y/index.md
{{APIRef("SVG")}}
The y read-only property of the {{domxref("SVGFEMergeElement")}} interface describes the vertical coordinate of the position of an SVG filter primitive as a {{domxref("SVGAnimatedLength")}}.
It reflects the {{SVGAttr("y")}} attribute of the {{SVGElement("feMerge")}} element. The attribute is a <length> or <percentage>. The <coordinate> is a length in the user coordinate system that is the given distance from the origin of the filter along the y-axis. If the y attribute is a percent value, the property value is a relative to the height of the filter region in user coordinate system units. The default value is 0.
An {{domxref("SVGAnimatedLength")}}.
const feMerge = document.querySelector("feMerge");
const topPosition = feMerge.y;
console.log(topPosition.baseVal.value); // the `y` value
{{Specifications}}
{{Compat}}