files/en-us/web/api/svgfedropshadowelement/width/index.md
{{APIRef("SVG")}}
The width read-only property of the {{domxref("SVGFEDropShadowElement")}} interface describes the horizontal size of an SVG filter primitive as a {{domxref("SVGAnimatedLength")}}.
It reflects the {{SVGAttr("width")}} filter primitive attribute. The attribute is a <length> or a <percentage> relative to the width of the filter region. The default value is 100%. The property value is a length in user coordinate system units.
An {{domxref("SVGAnimatedLength")}}.
const feDropShadow = document.querySelector("feDropShadow");
const horizontalSize = feDropShadow.width;
console.log(horizontalSize.baseVal.value); // the `width` value
{{Specifications}}
{{Compat}}