files/en-us/web/api/svgfecompositeelement/k2/index.md
{{APIRef("SVG")}}
The k2 read-only property of the {{domxref("SVGFECompositeElement")}} interface reflects the {{SVGAttr("k2")}} attribute of the given {{SVGElement("feComposite")}} element.
An {{domxref("SVGAnimatedNumber")}} object.
In this example, two {{SVGElement("feComposite")}} elements are defined in a filter, each with a different k2 attribute.
<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
<filter id="filter1">
<feImage
href="https://mdn.github.io/shared-assets/images/examples/progress-pride-flag.jpg"
width="140"
x="30"
y="10" />
<feComposite
in2="SourceGraphic"
operator="arithmetic"
k1="0.1"
k2="0.2"
k3="0.3"
k4="0.4" />
</filter>
<circle cx="100" cy="50" r="30" filter="url(#filter1)" />
</svg>
We can access the k2 attribute:
const composites = document.querySelectorAll("feComposite");
console.log(composites[0].k2.baseVal); // output: 0.2
{{Specifications}}
{{Compat}}